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General Description

The MAX4511/MAX4512/MAX4513 are quad, single-

pole/single-throw (SPST), fault-protected analog switch-

es. They are pin-compatible with the industry-standard

nonprotected DG201/DG202/DG213. These new switch-

es feature fault-protected inputs and Rail-to-Rail

®

signal

handling capability. The normally open (NO_) and 

normally closed (NC_) terminals are protected from 

overvoltage faults up to 36V during power-up or 

power-down. During a fault condition, the NO_ or NC_

terminal becomes an open circuit and only nanoamperes

of leakage current flow from the source, but the switch

output (COM_) furnishes up to 10mA of the appropriate

polarity supply voltage to the load. This ensures unam-

biguous rail-to-rail outputs when a fault begins and ends.

On-resistance is 175

max and is matched between

switches to 10

max. The off-leakage current is only

0.5nA at +25°C and 10nA at +85°C.

The MAX4511 has four normally closed switches. The

MAX4512 has four normally open switches. The

MAX4513 has two normally closed and two normally

open switches.

These CMOS switches can operate with dual power

supplies ranging from ±4.5V to ±18V or a single supply

between +9V and +36V.

All digital inputs have +0.8V and +2.4V logic thresh-

olds, ensuring both TTL- and CMOS-logic compatibility

when using ±15V or a single +12V supply.

Applications

ATE Equipment 

Data Acquisition

Industrial and Process-Control Systems

Avionics

Redundant/Backup Systems

Features

o

±40V Fault Protection with Power Off

±36V Fault Protection with ±15V Supplies

o

All Switches Off with Power Off

o

Rail-to-Rail Signal Handling

o

Output Clamped to Appropriate Supply Voltage

During Fault Condition; No Transition Glitch

o

175

max Signal Paths with ±15V Supplies

o

No Power-Supply Sequencing Required

o

±4.5V to ±18V Dual Supplies 

+9V to +36V Single Supply

o

Low Power Consumption, <2mW 

o

Four Separately Controlled SPST Switches

o

Pin-Compatible with Industry-Standard

DG411/DG412/DG413, DG201/DG202/DG213

o

TTL- and CMOS-Compatible Logic Inputs with

Single +9V to +15V or ±15V Supplies

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

MAX451

1

/MAX451

2

/MAX451

3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

________________________________________________________________

Maxim Integrated Products

1

TOP VIEW

DIP/SO

MAX4511

LOGIC

SWITCH

0

1

ON

OFF

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

IN2 

COM2

NC2

V+

V-

NC1

COM1

IN1

MAX4511

N.C.

NC3

COM3

IN3

IN4

COM4

NC4

GND

N.C. = NOT CONNECTED

SWITCHES SHOWN FOR LOGIC "0" INPUT.

ALL SWITCHES ARE OFF WITH POWER REMOVED.

19-4760; Rev 0; 6/98

Ordering Information continued at end of data sheet.

*

Contact factory for dice specifications.

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX4511C/D

0°C to +70°C

Dice*

MAX4511

CPE

0°C to +70°C

16 Plastic DIP

MAX4511CSE

0°C to +70°C

16 Narrow SO

Continued at end of data sheet.

MAX4511EPE

-40°C to +85°C

16 Plastic DIP

MAX4511MJE

-55°C to +125°C

16 CERDIP

MAX4511ESE

-40°C to +85°C

16 Narrow SO

Pin Configurations/

Functional Diagrams/Truth Tables

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MAX451

1

/MAX451

2

/MAX451

3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—Dual Supplies

(

V+ = +15V, V- = -15V, GND = 0V, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Note 1:

COM_ and IN_ pins are not fault protected. Signals on COM_ or IN_ exceeding V+ or V- are clamped by internal diodes.

Limit forward diode current to maximum current rating.

Note 2:

NC_ and NO_ pins are fault protected. Signals on NC_ or NO_ exceeding -36V to +36V may damage the device. These 

limits apply with power applied to V+ or V-, or ±40V with V+ = V- = 0.

(Voltages Referenced to GND)

V+ ........................................................................-0.3V to +44.0V

V- .........................................................................-44.0V to +0.3V

V+ to V-................................................................-0.3V to +44.0V

COM_, IN_ (Note 1) ..............................(V- - 0.3V) to (V+ + 0.3V)

NC_, NO_ (Note 2)..................................(V+ - 36V) to (V- + 36V)

NC_, NO_ to COM_ .................................................-36V to +36V

Continuous Current into Any Terminal..............................±30mA

Peak Current into Any Terminal

(pulsed at 1ms, 10% duty cycle)...................................±50mA

Continuous Power Dissipation (T

A

= +70°C) (Note 2)

Plastic DIP (derate 10.53mW/°C above +70°C) ...........842mW

Narrow SO (derate 8.70mW/°C above +70°C) .............696mW

CERDIP (derate 10.00mW/°C above +70°C) ................800mW

Operating Temperature Ranges

MAX451_C_ E ......................................................0°C to +70°C

MAX451_E_ E ...................................................-40°C to +85°C

MAX451_MJE .................................................-55°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10sec) .............................+300°C

Applies with power on or off

(Note 2)

V

COM_

= ±14V; 

V

NO_,

V

COM 

=   14V

V

COM_

= ±10V, I

COM_

= 1mA

V

COM_

= ±10V, I

COM_

= 1mA

CONDITIONS

C, E, M

-20

20

nA

I

COM_(OFF)

-0.5

0.01

0.5

V

-36

36

V

NO_

, V

NC_

Fault-Protected Analog 

Signal Range

R

ON

COM_ -NO_ or COM_ -NC_

On-Resistance Match Between

Channels (Note 4)

250

R

ON

COM_ -NO_ or COM_ -NC_

On-Resistance

125

160

UNITS

MIN

TYP

MAX

(Note 3)

SYMBOL

PARAMETER

C, E

+25°C

+25°C

+25°C

T

A

Applies with power on or off

(Note 2)

C, E, M

V

V-

V+

V

NO_

, V

NC_

Fault-Free Analog Signal Range

M

3

6

15

M

Applies with power on or off

(Note 1)

C, E, M

V

V- - 0.3

V+ + 0.3

V

COM_

Non-Protected Analog 

Signal Range (COM_ Output)

ANALOG SWITCH

200

C, E

C, E

10

COM_  Off Leakage Current

(Note 5)

V

COM_

= ±14V; 

V

NO_,

V

COM 

=   14V

NO_ or NC_ Off Leakage Current

(Note 5)

nA

I

NO_(OFF),

I

NC_(OFF)

-0.5

0.01

0.5

+25°C

-10

10

C, E

-200

200

M

±

-10

10

C, E

-200

200

M

V

COM_

= ±14V

nA

I

COM_(ON)

COM_  On Leakage Current

(Note 5)

-0.5

0.01

0.5

+25°C

-400

400

M

±

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MAX451

1

/MAX451

2

/MAX451

3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)

(

V+ = +15V, V- = -15V, GND = 0V, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.)

V

NO_

or V

NC

_ = ±33V

V

NO_

or V

NC

_ = ±33V

CONDITIONS

+25°C

t

ON

Turn-On Time

600

k

R

COM_

COM_ On Output Resistance,

Supplies On

1

2.5

nA

-10

10

I

COM_

COM_ Output Leakage Current,

Supplies On

UNITS

MIN

TYP

MAX

(Note 3)

SYMBOL

PARAMETER

+25°C

+25°C

T

A

V

NO_

or V

NC

_ = 33V

mA

I

COM_

COM_ On Output Current,

Supplies On

8

11

13

+25°C

V

NO_

or V

NC

_ = ±40V,

V+ = 0, V- = 0

µA

-10

10

I

NO_

, I

NC_

NO_ or NC_ Input Leakage

Current, Supplies Off

M

nA

-200

200

+25°C

M

-1

1

µA

1.9

2.4

V

V

IN_H

IN_ Input Logic Threshold High

C, E, M

900

M

V

COM_

= ±10V, R

L_

= 2k

,

Figure 3

ns

t

BBM

Break-Before-Make Time

Delay (MAX4513 Only)

50

100

+25°C

-1

0.03

1

V

IN

_ = 0.8V or 2.4V

µA

I

INH

_, I

INL

IN_ Input Current Logic High

or Low

+25°C

C, E

-200

200

C, E

V

NO_

or V

NC

_ = -33V

-12

-10

-7

C, E, M

C, E, M

-5

5

C, E

350

500

V

COM_

= ±10V, R

L_

= 2k

,

Figure 2

ns

t

OFF

Turn-Off Time

500

C, E

750

M

200

400

V

COM_

= ±10V, R

L_

= 2k

,

Figure 2

ns

+25°C

3

V

NO_

or V

NC

_ = ±25V,

V

COM_

=    10V 

µA

-10

10

I

NO_

, I

NC_

NO_ or NC_ Off Input Leakage

Current, Supplies On

M

nA

-200

200

+25°C

C, E

-20

20

-20

0.1

20

±

SWITCH DYNAMIC CHARAC-

C

L

= 1.0nF, V

NO_

= 0,

R

= 0

, Figure 4

pC

Q

Charge Injection (Note 6)

1.5

5

+25°C

f = 1MHz, Figure 5

pF

C

N_(OFF)

NO_ or NC_ Off-Capacitance

10

+25°C

f = 1MHz,  Figure 5

pF

C

COM_(OFF)

COM_ Off-Capacitance

5

+25°C

f = 1MHz,  Figure 5

pF

C

COM_(ON)

COM_ On-Capacitance

10

+25°C

LOGIC INPUT

R

L

= 50

, C

L

= 15pF,

V

N_

= 1V

RMS

, f = 1MHz, Figure 6

dB

VC

ISO

Off Isolation (Note 7)

-62

+25°C

R

L

= 50

, C

L

= 15pF,

V

N_

= 1V

RMS

, f = 1MHz, Figure 6

dB

V

CT

Channel-to-Channel Crosstalk

(Note 9)

-66

+25°C

0.8

1.9

V

V

IN_L

IN_ Input Logic Threshold Low

C, E, M

FAULT

(V+ = +15V, V- = -15V, unless otherwise noted.)

LOGIC INPUT

SWITCH DYNAMIC CHARACTERISTICS

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All V

IN_

= 0 or 15V

MAX451

1

/MAX451

2

/MAX451

3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)

(

V+ = +15V, V- = -15V, GND = 0V, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.)

CONDITIONS

UNITS

MIN

TYP

MAX

(Note 3)

SYMBOL

PARAMETER

T

A

Power-Supply Range

V+, V-

C,E, M

±4.5

±18

V

V+ Supply Current

I+

All V

IN_

= 0 or 5V

+25°C

280

400

µA

V- Supply Current

I-

All V

IN_

= 0 or 5V

+25°C

90

200

µA

GND Supply Current

I

GND

All V

IN_

= 0 or 15V

+25°C

-1

0.01

1

µA

600

C, E, M

C, E, M

300

C, E, M

10

+25°C

150

250

µA

C, E, M

450

All V

IN_

=  5V

POWER SUPPLY

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MAX451

1

/MAX451

2

/MAX451

3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

_______________________________________________________________________________________

5

ELECTRICAL CHARACTERISTICS—Single +12V Supply

(V+ = +10.8V to +13.2V, V- = 0, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.)

Applies with power on or off

(Note 2)

C, E, M

V

Applies with power on or off

(Note 2)

0

V+

V

NO_

, V

NC_

Fault-Free Analog Signal Range

V+ = 12V; V

COM _

= 0;

V

NO_

, V

NC_ 

= 12V

V+ = 12V, V

COM_

= 10V, 

I

COM_

= 1mA

V+ = 12V, V

COM_

= 10V, 

I

COM_

= 1mA

M

20

CONDITIONS

C, E, M

Applies with power on or off

(Note 1)

C, E, M

V

-0.3

V+ + 0.3

V

COM_

Non-Protected Analog 

Signal Range (COM_ Output)

V+ = 12V; V

COM_

= 10V;

V

NO_

, V

NC 

= 0 or 12V

nA

I

ON_(OFF),

I

NC_(OFF)

30

M

NO_ or NC_ Off Leakage Current

(Notes 5, 9)

-0.5

0.01

0.5

+25°C

nA

I

COM_(OFF)

COM_ Off Leakage Current

(Notes 5, 9)

-0.5

0.01

0.5

V

-36

36

V

NO_

, V

NC_

Fault-Protected Analog 

Signal Range

R

ON

COM_ -NO_ or COM_ -NC_

On-Resistance Match Between

Channels (Note 4)

525

R

ON

COM_ -NO_ or COM_ -NC_

On-Resistance

UNITS

MIN

TYP

MAX

(Note 3)

SYMBOL

PARAMETER

+25°C

C, E

C, E

T

A

+25°C

+25°C

4

10

260

390

450

-10

10

C, E

M

-200

200

-10

10

C, E

-200

200

M

V+ = 12V,

V

COM_

= 10V or 12V

-20

20

C, E

nA

I

COM_(ON)

COM_ On Leakage Current

(Notes 5, 9)

-400

400

M

-0.5

0.01

0.5

+25°C

V

NO_

or V

NC

_ = ±25V,

V

COM_

= 0, V+ = 12V

-200

200

C, E

nA

I

NO_

, I

NC_

NO_ or NC_ Off Input Leakage

Current, Supply On

-10

10

M

-20

20

+25°C

V

NO_

or V

NC

_ = ±40V,

V+ = 0, V- = 0

-200

200

C, E

nA

I

NO_

, I

NC_

NO_ or NC_ Input Leakage

Current, Supply Off

-10

10

M

-20

0.1

20

+25°C

V

NO_

or V

NC

_ = 25V,

V+ = 12V

2

3

5

mA

I

COM_

COM_ Output Current, 

Supply On

+25°C

V

NO_

or V

NC

_ = 10V

V+ = 12V

k

R

COM_

COM_ Output Resistance,

Supply On

2.4

5

+25°C

µA

µA

V

NO_

or V

NC

_ = ±30V,

V+ = 12V

-200

200

C, E

nA

I

COM_

COM_ Output Leakage 

Current, Supply On

-1

1

M

-10

10

+25°C

µA

FAULT

ANALOG SWITCH

background image

µA

MAX451

1

/MAX451

2

/MAX451

3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

6

_______________________________________________________________________________________

Note 1:

COM_ and IN_ pins are not fault protected. Signals on COM_ or IN_ exceeding V+ or V- are clamped by internal diodes.

Limit forward diode current to maximum current rating.

Note 2:

NC_ and NO_ pins are fault protected. Signals on NC_ or NO_ exceeding -36V to +36V may damage the device. These

limits apply with power applied to V+ or V-, or ±40V with V+ = V- = 0.

Note 3:

The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.

Note 4:

R

ON

R

ON(MAX)

R

ON(MIN)

.

Note 5:

Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at T

A

= +25°C.

Note 6:

Guaranteed by design.

Note 7:

Off isolation = 20 log10 [ V

COM_

/ (V

NC_

or V

NO_

) ], V

COM_

= output, V

NC_

or V

NO_

= input to off switch.

Note 8:

Between any two switches.

Note 9:

Leakage testing for single-supply operation is guaranteed by testing with dual supplies.

ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued)

(V+ = +10.8V to +13.2V, V- = 0, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.)

V

COM_

= 10V, R

L_

= 2k

,

Figure 2

CONDITIONS

V

COM_

= 10V, R

L_

= 2k

,

Figure 3

ns

t

ON

Turn-On Time

1.8

2.4

500

1000

V

V

IN_H

IN_ Input Logic Threshold High

C, E, M

0.8

1.8

V

V

IN_L

IN_ Input Logic Threshold Low

C, E, M

V

COM_

= 10V, R

L_

= 2k

,

Figure 2

ns

-1

0.03

1

t

OFF

Turn-Off Time

400

900

ns

+25°C

t

BBM

Break-Before-Make Time

Delay (MAX4513 Only)

50

100

+25°C

V

IN

_ = 0.8V or 2.4V

µA

I

IN_H

, I

IN_L

UNITS

MIN

TYP

MAX

(Note 3)

SYMBOL

PARAMETER

IN_ Input Current Logic High

or Low

+25°C

+25°C

T

A

LOGIC INPUT

C, E, M

-5

5

C, E, M

C, E, M

1500

1200

C

L

= 1.0nF, V

NO_

= 0, 

R

S

= 0

, Figure 4

pC

Q

Charge Injection (Note 6)

1

5

+25°C

f = 1MHz, Figure 5

pF

C

N_ (OFF)

NO_ or NC_ Off Capacitance

9

+25°C

V

COM_

= GND, f = 1MHz,

Figure 5

pF

C

COM_ (OFF)

COM_ Off Capacitance

9

+25°C

V

COM_

= V

NO_

= GND, 

f = 1MHz, Figure 5

pF

C

COM_ (ON)

COM_ On Capacitance

22

+25°C

R

L

= 50

, C

L

= 15pF,

V

N_

= 1V

RMS

, f = 1MHz, Figure 6

dB

V

ISO

Off Isolation (Note 7)

-62

+25°C

R

L

= 50

, C

L

= 15pF,

V

N_

= 1V

RMS

, f = 1MHz, Figure 5

dB

V

CT

Channel-to-Channel Crosstalk

(Note 8)

-65

+25°C

V

V+

Power-Supply Range

9

36

C,E, M

All V

IN_

= 0 or 5V

µA

I+

V+ Supply Current

150

300

+25°C

All V

IN_

= 0 or 12V

I

GND

V- and GND Supply Current

50

100

+25°C

All V

IN_

= 5V

µA

150

300

+25°C

450

C, E, M

C, E, M

C, E, M

200

450

SWITCH DYNAMIC CHARACTERISTICS

POWER SUPPLY

background image

MAX451

1

/MAX451

2

/MAX451

3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

_______________________________________________________________________________________

7

__________________________________________Typical Operating Characteristics

(T

= +25°C, unless otherwise noted.)

0

100

50

250

200

150

300

350

-20

-5

0

-15

-10

5

10

15

20

SWITCH ON-RESISTANCE

vs. V

COM 

(DUAL SUPPLIES)

 

MAX4511-01

V

COM

 (V)

SWITCH ON-RESISTANCE (

)

V+ = +5V

V- = -5V

V+ = +10V

V- = -10V

V+ = +15V

V- = -15V

V+ = +12V

V- = -12V

V+ = +20V

V- = -20V

0

80

60

20

40

160

140

100

120

180

200

-15

-5

0

-10

5

10

15

SWITCH ON-RESISTANCE vs. V

COM

 AND

TEMPERATURE (DUAL SUPPLIES)

 

MAX4511-02

V

COM

 (V)

SWITCH ON-RESISTANCE (

)

T

A

 = +125°C

T

A

 = -55°C

V+ = +15V

V- = -15V

T

A

 = -40°C

T

A

 = +25°C

T

A

 = +85°C

1000

100

0

5

10

15

20

25

30

SWITCH ON-RESISTANCE

vs. V

COM

 (SINGLE SUPPLY)

MA4511-03

V

COM

 (V)

SWITCH ON-RESISITANCE (

)

V+ = +12V

V+ = +5V

V- = 0

V+ = +15V

V+ = +20V

V+ = +24V

V+ = +30V

0

50

200

150

100

300

350

250

400

0

4

6

2

8

10

12

SWITCH ON-RESISTANCE vs. V

COM

 

AND TEMPERATURE (SINGLE SUPPLY)

MAX4511-04

V

COM

 (V)

SWITCH ON-RESISTANCE (

)

T

= +125°C

T

= +85°C

T

= +25°C T

= -40°C

T

= -55°C

V+ = +12V

0

300

200

100

700

800

600

500

400

900

1000

0

5

10

15

20

ON AND OFF TIMES

 vs. SUPPLY VOLTAGE

MAX4511-07

SUPPLY VOLTAGE (±V)

t

ON

, t

OFF

 (ns)

t

ON

(SINGLE SUPPLY)

t

ON

(DUAL SUPPLIES)

t

OFF

(DUAL SUPPLIES)

t

OFF

(SINGLE

SUPPLY)

1p

10p

100p

1n

10n

100n

-50

0

-25

25

50

75

100 125 150

I

D(ON)

, I

S(OFF)

, AND I

D(OFF)

 

LEAKAGES vs. TEMPERATURE 

MAX4511-05

TEMPERATURE (°C)

LEAKAGE (A)

I

NO(OFF)

 @V

NO 

= -14V, 

V

COM

 = +14V

I

COM(ON)

 @V

NO 

= V

COM

 = +14V

I

NO(OFF)

 @V

NO 

= +14V, 

V

COM

 = -14V

I

COM(OFF)

 @V

NO 

= -14V, 

V

COM

 = +14V

I

COM(OFF)

 @V

NO 

= +14V,

V

COM

 = -14V

I

COM(ON)

 @V

NO 

= V

COM

 = -14V

0

2

8

10

6

4

12

14

-15

-10

-5

0

5

10

15

CHARGE INJECTION 

vs. V

COM 

(DUAL SUPPLIES)

MAX4511-06

V

COM

 (V)

Q (pC)

DUAL ±15V

SUPPLIES

SINGLE +12V

SUPPLY

V+ = +15V

V- = -15V

0

100

300

200

500

400

600

-50

0

25

-25

50

75

100

125

ON AND OFF TIMES 

vs. TEMPERATURE

MAX4511-08

TEMPERATURE (°C)

t

ON

, t

OFF

 (ns)

t

ON

t

OFF

0

100

300

200

500

400

600

-50

0

25

-25

50

75

100

125

POWER-SUPPLY CURRENT

 vs. TEMPERATURE

MAX4511-09

TEMPERATURE (°C)

SUPPLY CURRENT

 

(

µ

A)

I

V+

I

V-

I

GND

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MAX451

1

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Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

8

_______________________________________________________________________________________

0

0.5

1.5

1.0

2.5

2.0

3.0

0

10

15

5

20

25

30

35

LOGIC-LEVEL THRESHOLD vs. V+

MAX4511-10

V+ (V)

LOGIC-LEVEL THRESHOLD (V)

Typical Operating Characteristics (continued)

(T

A

= +25°C, unless otherwise noted.)

0

-10

-20

-120

0.01

0.1

1

10

100

1000

FREQUENCY RESPONSE

-90

-100

-110

MAX186-14A

FREQUENCY (MHz)

LOSS (dB)

PHASE (DEGREES)

-70

-80

-50

-60

-30

-40

120

100

80

-120

-60

-80

-100

-20

-40

20

0

60

40

ON LOSS

OFF LOSS

ON PHASE

NAME

FUNCTION

1, 16,

9, 8

IN1–IN4

Logic Control Digital Inputs

2, 15,

10, 7

COM1–

COM4

Analog Switch Common* Terminals

PIN

3, 14,

11, 6

NO1–NO4

or

NC1–NC4

Analog Switch Fault-Protected Normally

Open* or Normally Closed* Terminals

4

V-

Negative Analog Supply Voltage Input.

Connect to GND for single-supply operation.

13

V+

Positive Analog and Digital Supply-Voltage

Input. Internally connected to substrate.

12

N.C.

No Connection—not internally connected

5

GND

Ground. Connect to digital ground. (Analog

signals have no ground reference.)

Pin Description

*

As long as the voltage on NO_ or NC_ does not exceed V+ or

V-, NO_ (or NC_) and COM_ pins are identical and interchange-

able. Either may be considered as an input or output; signals

pass equally well in either direction.

Detailed Description

Overview of Traditional 

Fault-Protected Switches

The MAX4511/MAX4512/MAX4513 are fault-protected

CMOS analog switches with unusual operation and

construction. Traditional fault-protected switches are

constructed by three series FETs. This produces good

off characteristics, but fairly high on-resistance when

the signals are within about 3V of each supply rail. As

the voltage on one side of the switch approaches with-

in about 3V of either supply rail (a fault condition), the

switch impedance becomes higher, limiting the output

signal range (on the protected side of the switch) to

approximately 3V less than the appropriate polarity

supply voltage.

During a fault condition, the output current that flows

from the protected side of the switch into its load

comes from the fault source on the other side of the

switch. If the switch is open or the load is extremely

high impedance, the input current will be very low. If

the switch is on and the load is low impedance,

enough current will flow from the source to maintain the

load voltage at 3V less than the supply.

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MAX451

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3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

_______________________________________________________________________________________

9

Overview of MAX4511/MAX4512/MAX4513

The MAX4511/MAX4512/MAX4513 differ considerably

from traditional fault-protection switches, with several

advantages. First, they are constructed with two paral-

lel FETs, allowing very low on-resistance when the

switch is on. Second, they allow signals on the NC_ or

NO_ pins that are within or slightly beyond the supply

rails to be passed through the switch to the COM termi-

nal, allowing rail-to-rail signal operation. Third, when a

signal on NC_ or NO_ exceeds the supply rails by

about 50mV (a fault condition), the voltage on COM_ is

limited to the appropriate polarity supply voltage.

Operation is identical for both fault polarities. The fault-

protection extends to ±36V from GND.

During a fault condition, the NO_ or NC_ input pin

becomes high impedance regardless of the switch

state or load resistance. If the switch is on, the COM_

output current is furnished from the V+ or V- pin by

“booster” FETs connected to each supply pin. These

FETs can typically source or sink up to 10mA.

When power is removed, the fault protection is still in

effect. In this case, the NO_ or NC_ terminals are a vir-

tual open circuit. The fault can be up to ±40V.

The COM_ pins are not fault protected; they act as nor-

mal CMOS switch pins. If a voltage source is connect-

ed to any COM_ pin, it should be limited to the supply

voltages. Exceeding the supply voltage will cause high

currents to flow through the ESD protection diodes,

possibly damaging the device (see 

Absolute Maximum

Ratings).

Pin Compatibility

These switches have identical pinouts to common non-

fault-protected CMOS switches. Care should be exer-

cised in considering them for direct replacements in

existing printed circuit boards, however, since only the

NO_ and NC_ pins of each switch are fault protected. 

Internal Construction

Internal construction is shown in Figure 1, with the ana-

log signal paths shown in bold. A single normally open

V+

NO_

(NC_)

IN_

GND

V-

HIGH

FAULT

LOW

FAULT

ON

N1

P1

P2

COM_

N2

NC SWITCH

-ESD DIODE

NORMALLY OPEN SWITCH CONSTRUCTION

Figure 1.  Block Diagram

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1

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3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

10

______________________________________________________________________________________

(NO) switch is shown; the normally closed (NC) config-

uration is identical except the logic-level translator

becomes an inverter. The analog switch is formed by

the parallel combination of N-channel FET N1 and P-

channel FET P1, which are driven on and off simultane-

ously according to the input fault condition and the

logic-level state.

Normal Operation

Two comparators continuously compare the voltage on

the NO_ (or NC_) pin with V+ and V-. When the signal

on NO_ or NC_ is between V+ and V- the switch acts

normally, with FETs N1 and P1 turning on and off in

response to IN_ signals. The parallel combination of

N1 and P1 forms a low-value resistor between NO_ (or

NC_) and COM_ so that signals pass equally well in

either direction.

Positive Fault Condition

When the signal on NO_ (or NC_) exceeds V+ by about

50mV, the high-fault comparator output is high, turning

off FETs N1 and P1. This makes the NO_ (or NC_) pin

high impedance regardless of the switch state. If the

switch state is “off”, all FETs are turned off and both

NO_ (or NC_) and COM_ are high impedance. If the

switch state is “on”, FET P2 is turned on, sourcing cur-

rent from V+ to COM_.

Negative Fault Condition

When the signal on NO_ (or NC_) exceeds V- by about

50mV, the low-fault comparator output is high, turning

off FETs N1 and P1. This makes the NO_ (or NC_) pin

high impedance regardless of the switch state. If the

switch state is “off,” all FETs are turned off and both

NO_ (or NC_) and COM_ are high impedance. If the

switch state is “on,” FET N2 is turned on, sinking cur-

rent from COM_ to V-.

Transient Fault Response and Recovery

When a fast rise-time and fall-time transient on IN_

exceeds V+ or V-, the output (COM_) follows the input

(IN_) to the supply rail with only a few nanoseconds

delay. This delay is due to the switch on-resistance and

circuit capacitance to ground. When the input transient

returns to within the supply rails, however, there is a

longer output recovery time delay. For positive faults, the

recovery time is typically 3.5µs. For negative faults, the

recovery time is typically 1.3µs. These values depend on

the COM_ output resistance and capacitance, and are

not production tested or guaranteed. The delays are not

dependent on the fault amplitude. Higher COM_ output

resistance and capacitance increase recovery times. 

COM_ and IN_ Pins

FETs N2 and P2 can source about ±10mA from V+ or V-

to the COM_ pin in the fault condition. Ensure that if the

COM_ pin is connected to a low-resistance load, the

absolute maximum current rating of 30mA is never

exceeded, both in normal and fault conditions.

The GND, COM_, and IN_ pins do not have fault protec-

tion. Reverse ESD-protection diodes are internally con-

nected between GND, COM_, IN_ and both V+ and V-. If

a signal on GND, COM_, or IN_ exceeds V+ or V- by

more than 300mV, one of these diodes will conduct

heavily. During normal operation these reverse-biased

ESD diodes leak a few nanoamps of current to V+ and V-.

Fault-Protection Voltage and Power Off

The maximum fault voltage on the NC_ or NO_ pins is

±36V with power applied and ±40V with power off.

Failure Modes

The MAX4511/MAX4512/MAX4513 are not lightning

arrestors or surge protectors.

Exceeding the fault-protection voltage limits on NO_ or

NC_, even for very short periods, can cause the device

to fail. The failure modes may not be obvious, and fail-

ure in one switch may or may not affect other switches

in the same package.

Ground

There is no connection between the analog signal

paths and GND. The analog signal paths consist of an

N-channel and P-channel MOSFET with their sources

and drains paralleled and their gates driven out of

phase to V+ and V- by the logic-level translators.

V+ and GND power the internal logic and logic-level

translators and set the input logic thresholds. The logic-

level translators convert the logic levels to switched V+

and V- signals to drive the gates of the analog switch-

es. This drive signal is the only connection between the

power supplies and the analog signals. GND, IN_, and

COM_ have ESD-protection diodes to V+ and V-.

IN_ Logic-Level Thresholds

The logic-level thresholds are CMOS and TTL compati-

ble when V+ is +15V. As V+ is raised the threshold

increases slightly, and when V+ reaches 25V the level

threshold is about 2.8V—above the TTL output high

level minimum of 2.4V, but still compatible with CMOS

outputs (see 

Typical Operating Characteristics).

Increasing V- has no effect on the logic-level thresholds,

but it does increase the gate-drive voltage to the signal

FETs, reducing their on-resistance.

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MAX451

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/MAX451

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Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

______________________________________________________________________________________

11

Bipolar Supplies

The MAX4511/MAX4512/MAX4513 operate with bipolar

supplies between ±4.5V and ±18V. The V+ and V- sup-

plies need not be symmetrical, but their difference can

not exceed the absolute maximum rating of 44V. 

Single Supply

The MAX4511/MAX4512/MAX4513 operate from a sin-

gle supply between +9V and +36V when V- is connect-

ed to GND. 

High-Frequency Performance

In 50

systems, signal response is reasonably flat up to

50MHz (see 

Typical Operating Characteristics). Above

20MHz, the on-response has several minor peaks that

are highly layout dependent. The problem with high-fre-

quency operation is not turning the switch on, but turn-

ing it off. The off-state switch acts like a capacitor and

passes higher frequencies with less attenuation. At

10MHz, off isolation is about -42dB in 50

systems,

becoming worse (approximately 20dB per decade) as

frequency increases. Higher circuit impedances also

make off isolation worse. Adjacent channel attenuation

is about 3dB above that of a bare IC socket and is due

entirely to capacitive coupling.

50%

t

ON

V+

0V

+10V

V

OUT

V

IN_

0V

90%

90%

t

OFF

V

IN_

V+

V

OUT

GND

V+

IN_

NO_ OR NC_

COM_

+10V

MAX4511

MAX4512

MAX4513

2k

50

10pF

V-

V-

V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.

Figure 2.  Switch Turn-On/Turn-Off Times

Test Circuits/Timing Diagrams

50%

V+

0V

V

NO_

, V

NC_

V

OUT

V

IN_

0V

80%

t

OPEN

V+

V

OUT

V

IN_

GND

V-

V-

2k

V+

IN_

IN_

NO_

NC_

COM_

COM_

+10V

MAX4513

50

10pF

V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.

t

R

 < 5ns

t

F

 < 5ns

Figure 3.  MAX4513 Break-Before-Make Interval

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/MAX451

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Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

12

______________________________________________________________________________________

0V

V+

V

IN_

∆ 

V

OUT

 IS THE MEASURED VOLTAGE DUE TO CHARGE-

TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF.

∆ 

V

OUT

V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.

Q = 

 V

OUT

 x C

L

V

OUT

V+

V

OUT

V

IN_

GND

V+

V-

V-

IN_

NO_ OR NC_

COM_

MAX4511

MAX4512

MAX4513

50

CL

1000pF

Figure 4.  Charge Injection

V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.

V+

V+

GND

V+

V-

V-

IN_

NO_

COM_

MAX4511

MAX4512

MAX4513

NC_

ADDRESS SELECT

1MHz

CAPACITANCE

ANALYZER

Figure 5.  COM_, NO_, NC_ Capacitance

Test Circuits/Timing Diagrams (continued)

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MAX451

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3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

______________________________________________________________________________________

13

MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS.

OFF ISOLATION IS MEASURED BETWEEN COM_ AND “OFF” NO_ OR NC_ TERMINALS.

ON LOSS IS MEASURED BETWEEN COM_ AND “ON” NO_ OR NC_ TERMINALS.

CROSSTALK IS MEASURED BETWEEN COM_ TERMINALS WITH ALL SWITCHES ON.

SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.

V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.

V+

GND

MEAS.

REF.

V+

V-

V-

IN_

COM_

MAX4511

MAX4512

MAX4513

NO_, NC_

ADDRESS SELECT

10nF

10nF

NETWORK 

ANALYZER

50

50

50

50

OFF ISOLATION = 20 log

ON LOSS = 20 log

CROSSTALK = 20 log

V

OUT

V

IN

V

OUT

V

IN

V

OUT

V

IN

V

IN

V

OUT

Figure 6.  Frequency Response, Off Isolation, and Crosstalk

Test Circuits/Timing Diagrams (continued)

N.C. = NOT CONNECTED

SWITCHES SHOWN FOR LOGIC “0” INPUT.

ALL SWITCHES ARE OFF WITH POWER REMOVED.

DIP/SO

MAX4512

LOGIC

SWITCH

0

1

OFF

ON

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

IN2 

COM2

NO2

V+

V-

NO1

COM1

IN1

MAX4512

N.C.

NO3

COM3

IN3

IN4

COM4

NO4

GND

TOP VIEW

DIP/SO

MAX4513

LOGIC

SWITCHES

1, 4

0

1

OFF

ON

SWITCHES

2, 3

ON

OFF

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

IN2 

COM2

NC2

V+

V-

NO1

COM1

IN1

MAX4513

N.C.

NC3

COM3

IN3

IN4

COM4

NO4

GND

Pin Configurations/Functional Diagrams/Truth Tables (continued)

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MAX451

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Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

14

______________________________________________________________________________________

NC1 COM1

IN1 IN2

COM2

V-

GND

NC4

COM4

IN4 IN3 COM3

0.086"

(2.261mm)

0.138"

(3.51mm)

V+

NC2

 NC3

MAX4511

NO1

NO2

COM1 IN1

IN2 COM2

V-

GND

COM4

NO4

IN4 IN3

NO3

COM3

0.086"

(2.261mm)

V+

MAX4512

0.138"

(3.51mm)

PART

MAX4512

CPE

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

16 Plastic DIP

MAX4512CSE

0°C to +70°C

16 Narrow SO

MAX4512C/D

0°C to +70°C

Dice*

MAX4512EPE

-40°C to +85°C

16 Plastic DIP

MAX4512ESE

-40°C to +85°C

16 Narrow SO

MAX4512MJE

-55°C to +125°C

16 CERDIP

MAX4513

CPE

0°C to +70°C

16 Plastic DIP

MAX4513CSE

0°C to +70°C

16 Narrow SO

MAX4513C/D

0°C to +70°C

Dice*

MAX4513EPE

-40°C to +85°C

16 Plastic DIP

MAX4513ESE

-40°C to +85°C

16 Narrow SO

MAX4513MJE

-55°C to +125°C

16 CERDIP

Ordering Information (continued)

*

Contact factory for dice specifications.

Chip Topographies

NO1

NC2

COM1

IN1 IN2 COM2

V-

GND

COM4

NO4

IN4 IN3

NC3

COM3

V+

MAX4513

0.086"

(2.261mm)

0.138"

(3.51mm)

TRANSISTOR COUNT: 139

SUBSTRATE CONNECTED TO: V+

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MAX451

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2

/MAX451

3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

______________________________________________________________________________________

15

SOICN.EPS

PDIPN.EPS

________________________________________________________Package Information

background image

MAX451

1

/MAX451

2

/MAX451

3

Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

16

____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA  94086 408-737-7600

© 1998 Maxim Integrated Products 

Printed USA

is a registered trademark of Maxim Integrated Products.

CDIPS.EPS

Package Information (continued)