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_______________General Description

The DG308A/DG309 are quad, single-pole-single-throw

(SPST) analog switches. The DG308A is normally open

(SPST, NO), while the DG309 is normally closed (SPST,

NC). Both parts feature fast switching speeds and low on-

resistance over the analog range. Other features include a

turn-on time under 120ns, a turn-off time under 90ns, and a

channel on-resistance of 60

. CMOS inputs provide

reduced input loading and very low leakage currents.

Both parts feature a 44V maximum breakdown voltage rat-

ing that allows 30V peak-to-peak switch-off blocking

capacity. The DG308A/DG309 can be used with split sup-

plies (±5V to ±20V) or a single positive supply (+5V to

+30V), while retaining CMOS-logic-compatible inputs.

________________________Applications

Sample-and-Hold Circuits

Test Equipment

Communications Systems

PBX, PABX

Guidance and Control Systems

Heads-Up Displays

Military Radios

____________________________Features

o

60

r

DS(ON)

o

Single/Bipolar-Supply Operation

o

CMOS Logic Compatible

o

Monolithic, Low-Power CMOS Design

DG308A/DG309

Quad, SPST Analog Switches

________________________________________________________________

Maxim Integrated Products

1

DIP/SO

LOGIC

DG308A

TRUTH TABLE

0

1

OFF

ON

DG309

ON

OFF

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

IN2 

D2

S2

V+ (SUBSTRATE)

V-

S1

D1

IN1

DG308A

DG309

N.C.

S3

D3

IN3

IN4

D4

S4

GND

TOP VIEW

______Pin Configuration/Truth Table

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

DG308A

DG309

V

IN

 ±10V

5k

-15V

+15V

*

*

*

*

5k

40k

10k

20k

V

OUT

PROGRAMMABLE-GAIN AMPLIFIER

 * PINS 1, 8, 9, AND 16 ARE LOGIC-CONTROL INPUTS.

__________Typical Operating Circuit

19-3926; Rev 0; 3/91

PART

DG308A

CJ

DG308ACY

DG308ACK

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

16 Plastic DIP

16 Narrow SO

16 CERDIP

______________Ordering Information

*  Contact factory for dice specifications.

** Contact factory for availability and processing to MIL-STD-883.

DG308AC/D

0°C to +70°C

Dice*

DG308ADJ

DG308ADY

DG308ADK

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

16 Plastic DIP

16 Narrow SO

16 CERDIP

DG308AAK

-55°C to +125°C

16 CERDIP**

DG309

CJ

DG309CY

DG309CK

0°C to +70°C

0°C to +70°C

0°C to +70°C

16 Plastic DIP

16 Narrow SO

16 CERDIP

DG309C/D

0°C to +70°C

Dice*

DG309DJ

DG309DY

DG309DK

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

16 Plastic DIP

16 Narrow SO

16 CERDIP

DG309AK

-55°C to +125°C

16 CERDIP**

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DG308A/DG309

Quad, SPST Analog Switches

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = 15V, V- = -15V, T

A

= T

MIN

to T

MAX

, unless otherwise noted.) (Note 2)

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.

Voltage Referenced to V-

V+ ....................................................................................+44V

GND .................................................................................+25V

Digital Inputs V

S

, V

D

................(V- - 2V) to (V+ + 2V) or 20mA,

whichever occurs first

Current into Any Terminal (except S or D) ..........................30mA

Continuous Current (S or D)................................................20mA

Peak Current (S or D)

(pulsed at 1ms, 10% duty cycle max) ............................70mA

Continuous Power Dissipation (TA = +70°C) (Note 1)

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

DG308AC_/DG309C_ .........................................0°C to +70°C

DG308AD_/DG309D_ ......................................-40°C to +85°C

DG308AAK/DG309AK ...................................-55°C to +125°C

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

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

T

A

= +25°C,

T

MIN

T

A

= +25°C

T

A

= +25°C,

T

MAX

T

A

= +25°C,

T

MAX

T

A

= T

MAX

T

A

= T

MAX

T

A

= +25°C

T

A

= T

MAX

T

A

= +25°C

CONDITIONS

µA

-1

-0.001

1

I

INL

Input Current with

Input Voltage Low

µA

-1

0.001

1

I

INH

Input Current with

Input Voltage High

60

100

V

-15

15

V

ANALOG

Analog Signal Range

nA

-100

100

I

S(OFF)

Source-Off 

Leakage Current

95

150

r

DS(ON)

Drain-Source 

On-Resistance

-1

0.1

1

-100

100

-1

-0.1

1

UNITS

DG30_AK

MIN

TYP

MAX

SYMBOL

PARAMETER

V

IN

= 0V

V

IN

= 15V

V

IN

= 3.5V (DG308A),

V

IN

= 11V (DG309),

V

S

= -14V, V

D

= 14V

V

IN

= 11V (DG308A),

V

IN

= 3.5V (DG309),

I

S

= 1mA, 

V

D

= 10V or -10V

V

IN

= 3.5V (DG308A),

V

IN

= 11V (DG309),

V

S

= 14V, V

D

= -14V

T

A

= T

MAX

T

A

= +25°C

T

A

= T

MAX

T

A

= +25°C

nA

-100

100

I

D(OFF)

Drain-Off 

Leakage Current

-1

0.1

1

-100

100

V

IN

= 3.5V (DG308A),

V

IN

= 11V (DG309),

V

S

= -14V, V

D

= 14V

-1

0.1

1

V

IN

= 3.5V (DG308A),

V

IN

= 11V (DG309),

V

S

= 14V, V

D

= -14V

T

A

= T

MAX

T

A

= +25°C

T

A

= T

MAX

T

A

= +25°C

nA

-200

200

I

D(ON)

Drain-On 

Leakage Current

-2

0.1

2

-200

200

V

IN

= 11V (DG308A),

V

IN

= 3.5V (DG309),

V

S

= V

D

= -14V

-2

0.1

2

V

IN

=11V (DG308A),

V

IN

= 3.5V (DG309),

V

S

= V

D

= +14V

-200

200

-1

0.001

1

-1

0.001

1

-5

0.1

5

-200

200

-5

0.1

5

60

100

-15

15

-100

100

80

125

-5

0.1

5

-100

100

-5

0.1

5

DG30_C/D

MIN

TYP

MAX

-100

100

-5

0.1

5

-100

100

-5

0.1

5

SWITCH

INPUT

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DG308A/DG309

Quad, SPST Analog Switches

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, V- = -15V, T

A

= T

MIN

to T

MAX

, unless otherwise noted.) (Note 2)

8

27

Drain-Off

Capacitance

C

D(OFF)

8

pF

Channel-On

Capacitance

C

D(ON) 

+

C

S(ON)

27

pF

V

IN

= 0V (DG308A), V

IN

= 15V (DG309),

f = 140kHz, V

S

= 0V

V

IN

= 0V (DG308A), V

IN

= 15V (DG309),

V

D

= V

S

= 0V

-100

Negative Supply 

Current

I-

-100

µA

All channels on or off,

V

IN

= 0V or 15V

T

A

= T

MAX

-10

Charge Injection

Q

-10

pC

C

L

= 0.01µF, V

GEN

= 0V, R

GEN

= 0

90

150

Turn-Off Time

t

OFF

90

150

ns

130

200

78

11

Turn-On Time

t

ON

130

200

ns

Off Isolation 

(Note 3)

OIRR

78

dB

Source-Off

Capacitance

C

S(OFF)

Figure 1

11

pF

V

IN

= 0V (DG308A), V

IN

= 15V (DG309),

Z

L

= 75

, V

S

= 2V

p-p

, f = 500kHz

V

IN

= 0V (DG308A), V

IN

= 15V (DG309),

f = 140kHz, V

S

= 0V

Figure 1

-100 -0.001 100

-10

-0.001

10

T

A

= +25°C

100

I+

100

µA

All channels on or off,

V

IN

= 0V or 15V

T

A

= T

MAX

-100 0.001

100

Positive Supply 

Current

-10

0.001

10

T

A

= +25°C

DG30_C/D

MIN

TYP

MAX

PARAMETER

SYMBOL

DG30_AK

MIN

TYP

MAX

UNITS

CONDITIONS

Note 1:

All leads are soldered or welded to the PC board.

Note 2:

The algebraic convention where the most negative value is a minimum and the most positive value a maximum is used in

this data sheet.

Note 3:

Off isolation = 20log10 V

D

/V

S

, V

D

= output, V

S

= input to off switch.

50%

OV

V

S

0V

t

ON

t

OFF

0.9V

O

0.9V

O

LOGIC

INPUT IN1

t

r

 < 20ns

t

f

 < 20ns

SWITCH

INPUT

SWITCH

OUTPUT VO

SWITCH

INPUT

V

S

 = +3V

SWITCH

OUTPUT

V

O

LOGIC

INPUT

D1

S1

IN1

+15V  

V+

GND   

0V

V-    

-15V

R

L

1k

C

L

35pF

V

O

 = V

S

R

L

R

L

 + r 

DS(ON)

(REPEAT TEST FOR S2, S3, AND S4)

Figure 1. Switching-Time Test Circuit

SUPPLY

DYNAMIC

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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.

4

___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA  94086 (408) 737-7600

© 1991 Maxim Integrated Products 

Printed USA

is a registered trademark of Maxim Integrated Products.

DG308A/DG309

Quad, SPST Analog Switches

__________________________________________Typical Operating Characteristics

(T

= +25°C, unless otherwise noted.)

500

0

0

DRAIN-SOURCE ON-RESISTANCE

vs. DRAIN VOLTAGE & POWER SUPPLIES

400

DG308A309 TOC01

VD (V)

r

DS(ON)

 (

)

15

200

100

5

10

300

20

V+ = 5V

V+ = 10V

V+ = 15V

V+ = 20V

T

A

 = +25°C

V- = GND

500

600

700

800

0

POWER-SUPPLY CURRENT 

AND VOLTAGE vs. TEMPERATURE

400

DG308A309 TOC02

TEMPERATURE (°C)

I

SUPPLY

 (nA)

200

100

300

-50

125

25

-25

0

75

50

100

V+ = 44V

V+ = 30V

V+ = 5V

V+ = 10V

T

A

 = +25°C

V- = GND

250

0

-15

DRAIN-SOURCE ON-RESISTANCE

vs. DRAIN VOLTAGE & POWER SUPPLIES

200

DG308A309 TOC04

VD (V)

r

DS(ON)

 (

)

0

100

50

-10

-5

150

5

10

15

V+ = ±5V 

V+ = ±10V

V+ = ±12V

V+ = ±15V

T

A

 = +25°C

-30

-12

LEAKAGE CURRENTS vs.

ANALOG VOLTAGE

10

20

DG308A309 TOC03

VANALOG (V)

I

S

, I

D

 (pA)

6

-10

-20

-6

0

0

12

T

A

 = +25°C

V

CC

 = ±15V

I

S(OFF)

I

D(OFF)

I

D(ON)

_____________________Pin Description

Ground

GND

5

No Connect. Not internally 

connected.

N.C.

12

Positive Supply Voltage Input.

Connected to substrate.

V+

13

Negative Supply Voltage Input

V-

4

Source Input

S1–S4

3, 6, 11, 14

PIN

Drain Output

D1–D4

2, 7, 10, 15

Logic Control Inputs

IN1–IN4

1, 8, 9, 16

FUNCTION

NAME

__________Applications Information

The DG308A/DG309 switch positive analog signals while

using a single positive supply, allowing use in applica-

tions where only one supply is available. The disadvan-

tages of using a single supply are slower switching

speed and increased r

DS(ON)

. The 

Power-Supply

Current and Voltage vs. Temperature graph shows the

typical curve for a single-supply design. As stated in the

Absolute Maximum Ratings, the analog voltage should

not go above or below the supply voltages, which are V+

and 0V in single-supply operation.