background image

I

2

C is a trademark of Philips Corp.

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

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

For small orders, phone 1-800-835-8769.

General Description

The MAX4571–MAX4574 serial-interface controlled

switches are ideal for multimedia applications. Each

device features 35

max on-resistance, -90dB audio

off-isolation at 20kHz, -60dB video off-isolation at

1.0MHz, and “clickless” mode operation for audio

applications. 

The MAX4571/MAX4573 contain eleven SPST switches,

while the MAX4572/MAX4574 contain two SPST switch-

es and six SPDT switches. The MAX4571/MAX4572 fea-

ture a 2-wire, I

2

C™-compatible serial interface. The

MAX4573/MAX4574 feature a 3-wire, SPI™/QSPI™/

MICROWIRE™-compatible serial interface. All four

parts are available in 28-pin QSOP, SSOP, and wide

SO packages and operate over the commercial and

extended temperature ranges.

Applications

Set-Top Boxes

Audio Systems

PC Multimedia Boards

Video Conferencing Systems

Features

o

Selectable Soft Switching Mode for “Clickless”

Audio Operation

o

35

max On-Resistance

o

-90dB Audio Off-Isolation at 20kHz

-50dB Video Off-Isolation at 10MHz

o

-90dB Audio Crosstalk at 20kHz

-52dB Video Crosstalk at 10MHz

o

Serial Interface

2-Wire, Fast-Mode, I

2

C-Compatible (MAX4571/72)

3-Wire, SPI/QSPI/MICROWIRE-Compatible 

(MAX4573/74)

o

Single-Supply Operation from +2.7V to +5.25V

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

________________________________________________________________

Maxim Integrated Products

1

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

V+

SDA (DOUT)

SCL (DIN)

A1 (SCLK)

A0 (CS)

GND

COM11

( ) ARE FOR MAX4573

NO8

COM8

NO9

COM9

NO10

COM10

NO11

COM7

NO7

COM6

NO6

COM5

NO5

COM4

NO4

COM3

NO3

COM2

NO2

COM1

NO1

QSOP/SSOP/SO

TOP VIEW

MAX4571/MAX4573

19-1404; Rev 1; 4/99

PART

MAX4571

CEI

MAX4571CAI

MAX4571CWI

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

28 QSOP

28 SSOP

28 Wide SO

Pin Configurations

Ordering Information

MAX4571EEI

-40°C to +85°C

28 QSOP

MAX4571EAI

-40°C to +85°C

28 SSOP

MAX4571EWI

-40°C to +85°C

28 Wide SO

MAX4572

CEI

0°C to +70°C

28 QSOP

MAX4572CAI

0°C to +70°C

28 SSOP

MAX4572CWI

0°C to +70°C

28 Wide SO

MAX4572EEI

-40°C to +85°C

28 QSOP

MAX4572EAI

-40°C to +85°C

28 SSOP

MAX4572EWI

-40°C to +85°C

28 Wide SO

MAX4573

CEI

0°C to +70°C

28 QSOP

MAX4573CAI

0°C to +70°C

28 SSOP

MAX4573CWI

0°C to +70°C

28 Wide SO

MAX4573EEI

-40°C to +85°C

28 QSOP

MAX4573EAI

-40°C to +85°C

28 SSOP

MAX4573EWI

-40°C to +85°C

28 Wide SO

MAX4574

CEI

0°C to +70°C

28 QSOP

MAX4574CAI

0°C to +70°C

28 SSOP

MAX4574CWI

0°C to +70°C

28 Wide SO

MAX4574EEI

-40°C to +85°C

28 QSOP

MAX4574EAI

-40°C to +85°C

28 SSOP

MAX4574EWI

-40°C to +85°C

28 Wide SO

Pin Configurations continued at end of data sheet.

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—Single +5V Supply

(V+ = +5V ±5%, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.) (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.

V+ to GND ................................................................-0.3V to +6V

NO_ _, COM_, DOUT to GND (Note 1) ........-0.3V to (V+ + 0.3V)

SCL, SDA, 

CS, SCLK, DIN, A0, A1 to GND..............-0.3V to +6V

Continuous Current into Any Terminal..............................±10mA

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

Continuous Power Dissipation (T

A

= +70°C)

QSOP (derate 10.8mW/°C above +70°C) ...................860mW

SSOP (derate 9.5mW/°C above +70°C) .....................762mW

Wide SO (derate 12.5mW/°C above +70°C).............1000mW

Operating Temperature Ranges

MAX457_C_ _ ....................................................0°C to +70°C

MAX457_E_ _..................................................-40°C to +85°C

Storage Temperature Range .............................-65°C to +160°C

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

V

NO

_ _ = 4.5V, 1V;

V

COM

_ = 1V, 4.5V;

V+ = 5.25V

I

COM

_ = 4mA; 

V+ = 4.75V;

V

NO

_ _ = 1V, 2V, 3V   

I

COM

_ = 4mA, 

V

NO

_ _ = 3V,

V+ = 4.75V

CONDITIONS

V

0

V+

V

NO

_ _,

V

COM

_

ANALOG SWITCHES

Analog Signal Range (Note 3)

nA

-0.2

0.01

0.2

I

NO

_ _ 

(OFF)

NO_ _ Off-Leakage

Current (Note 6)

2 6

R

FLAT

On-Resistance

Flatness (Note 5)

25

35

R

ON

On-Resistance

45

0.8

3

R

ON

On-Resistance Match

Between Channels (Note 4)

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

COM_ Off-Leakage 

Current (Note 6)

I

COM

(OFF)

V

NO

_ _ = 4.5V, 1V;

V

COM

_ = 1V, 4.5V;

V+ = 5.25V

-0.2

0.01

0.2

nA

COM _ On-Leakage 

Current (Note 6)

I

COM

(ON)

V

COM

_ = 4.5V, 1V;

V

NO

_ _ = 4.5V, 1V, or

floating; V+ = 5.25V

-0.2

0.01

0.2

nA

AUDIO PERFORMANCE

Total Harmonic Distortion 

plus Noise

THD+N

f

IN

= 1kHz, R

= 600

, V

NO

_ _ = 1V

RMS

V

NO_ _

= 2.5V

0.07

%

Off-Isolation (Note 7)

V

ISO(A)

V

NO

_ _ = 1V

RMS

, f

IN

= 20kHz, 

R

L

= 600

, Figure 1

-90

dB

Channel-to-Channel Crosstalk

V

CT(A)

V

NO

_ _ = 1V

RMS

, f

IN

= 20kHz, 

R

S

= 600

, Figure 1

-90

dB

I

COM

_ = 4mA, 

V

NO

_ _ = 3V,

V+ = 4.75V

T

A

= +25°C

T

A

= T

MIN

to T

MAX

T

A

= +25°C

T

A

= +25°C

T

A

= +25°C

T

A

= +25°C

T

A

= +25°C

3

T

A

= T

MIN

to T

MAX

T

A

= T

MIN

to T

MAX

6

T

A

= T

MIN

to T

MAX

T

A

= T

MIN

to T

MAX

T

A

= T

MIN

to T

MAX

-10

10

-10

10

-10

10

ANALOG SWITCHES

AUDIO PERFORMANCE

Note 1:

Signals on NO_ _ or COM_ exceeding V+ or V- are clamped by internal diodes. Limit forward-diode current to maximum 

current rating.

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)

(V+ = 5V ±5%, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 2)

ELECTRICAL CHARACTERISTICS—Single +3V Supply

(V+ = 3V ±10%, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 2)

I

COM

_ = 4mA, 

V

NO

_ _ =2V,

V+ = 2.7V

T

A

= +25°C

T

A

= T

MIN

to T

MAX

T

A

= +25°C

5

T

A

= T

MIN

to T

MAX

I

COM

_ = 4mA,

V

NO

_ _ = 2V,

V+ = 2.7V

CONDITIONS

V

0

V+

V

NO

_ _,

V

COM

_

ANALOG SWITCHES

Analog Signal Range (Note 3)

43

90

R

ON

On-Resistance

110

1

5

R

ON

On-Resistance Match

Between Channels (Note 4)

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

ANALOG SWITCHES

V

NO

_ _ = 1.5V, 

R

L

= 5k

C

L

= 35pF

T

A

= +25°C

T

A

= T

MIN

to T

MAX

T

A

= +25°C

400

f

IN

= 1MHz

All logic inputs = 0 or V+,

T

A

= T

MIN

to T

MAX

MAX4572/MAX4574, V

NO

_ _ = 1.5V, 

T

A

= T

MIN

to T

MAX

T

A

= T

MIN

to T

MAX

V

NO

_ _ = 1.5V, 

R

L

= 300

C

L

= 35pF

CONDITIONS

pF

9

C

OFF(NO)

Off-Capacitance

µA

6

10

I+

Supply Current (Note 9)

ns

10

125

t

BBM

Break-Before-Make Time

ns

200

500

t

ONSD

Turn-On Time

700

ns

75

300

t

OFFSD

Turn-Off Time

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

T

A

= T

MIN

to T

MAX

V

+2.7

+5.25

V+

Supply Voltage Range

V

NO

_ _ or = 1.5V, R

L

= 300

, C

L

= 35pF,

T

A

= +25°C

ms

3

t

OFFSE

Turn-Off Time

V

NO

_ _ = 1.5V, R

L

= 5k

, C

L

= 35pF,

T

A

= +25°C

ms

8

t

ONSE

Turn-On Time

R

SOURCE

= 50

, R

L

= 50

MHz

>150

BW

-3dB Bandwidth

V

NO

_ _ = 1V

RMS

, f

IN

= 1.0MHz, 

R

S

= 50

, Figure 1

dB

-52

V

CT(V)

Channel-to-Channel Crosstalk

V

NO

_ _ = 1V

RMS

, f

IN

= 1.0MHz, 

R

L

= 50

, Figure 1

dB

-50

V

ISO(V)

Off-Isolation (Note 7)

DYNAMIC TIMING WITH CLICKLESS MODE DISABLED 

(Notes 8 and 12, Figure 2)

DYNAMIC TIMING WITH CLICKLESS MODE ENABLED 

(Note 8, Figure 2)

POWER SUPPLY

VIDEO PERFORMANCE

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—Single +3V Supply (continued)

(V+ = +3V ±10%, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 2)

ns

T

A

= +25°C

T

A

= +25°C

T

A

= T

MIN

to T

MAX

-10

10

T

A

= T

MIN

to T

MAX

CONDITIONS

COM _ On-Leakage 

Current (Notes 6 and 10)

I

COM

(ON)

V

COM_ 

= 3V, 0.5V;

V

NO

_ _ = 3V, 0.5V,

or floating; 

V+ = 3.6V

-0.2

0.01

0.2

nA

Total Harmonic Distortion 

plus Noise

THD+N

f

IN

= 1kHz, R

= 600

, V

NO

_ = 0.5V

RMS

V

NO_ _

= 1.5V

0.07

%

Off-Isolation (Note 7)

V

ISO(A)

V

NO_ _

= 0.5V

RMS

, f

IN

= 20kHz, R

L

= 600

,

Figure 1

-90

dB

Channel-to-Channel Crosstalk

V

CT(A)

V

NO_ _

= 0.5V

RMS

, f

IN

= 20kHz, R

S

= 600

,

Figure 1

-90

dB

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

Off-Isolation (Note 7)

V

ISO(V)

V

NO_ _

= 0.5V

RMS

, f

IN

= 10MHz, R

L

= 50

,

Figure 1

-50

dB

Channel-to-Channel Crosstalk

V

CT(V)

V

NO_ _

= 0.5V

RMS

, f

IN

= 10MHz, R

S

= 50

,

Figure 1

-52

dB

-3dB Bandwidth

BW

R

SOURCE

= 50

, R

L

= 50

, C

L

= 35pF

>150

MHz

Off Capacitance

C

OFF(NO)

f

IN

= 1MHz

9

pF

Turn-On Time

t

ONSD

V

NO_ _

= 1.5V, 

R

L

= 5k

, C

L

= 35pF

300

900

ns

1000

T

A

= +25°C

T

A

= T

MIN

to T

MAX

10

On-Resistance

Flatness (Note 5)

R

FLAT

I

COM_ 

= 4mA;

V

+

= 2.7V;

V

NO_ _

= 1V, 5V, 2V

4

10

T

A

= +25°C

T

A

= T

MIN

to T

MAX

Turn-Off Time

t

OFFSD

V

NO_ _

= 1.5V, 

R

L

= 300

, C

L

= 35pF

100

300

400

V

NO_ _

= 1.5V, T

A

= T

MIN

to T

MAX

Break-Before-Make Time

t

BBM

10

200

ns

V

NO_ _

= 1.5V, R

L

= 5k

, C

L

= 35pF,

T

A

= +25°C

Turn-On Time

t

ONSE

8

ms

V

NO_ _

= 1.5V, R

L

= 300

, C

L

= 35pF,

T

A

= +25°C

Turn-Off Time

t

OFFSE

3

ms

T

A

= +25°C

T

A

= T

MIN

to T

MAX

-10

10

COM_ Off-Leakage 

Current (Notes 6 and 10)

I

COM

(OFF)

V

NO_ _

= 3V, 0.5V;

V

COM

_ = 0.5V, 3V;

V+ = 3.6V

-0.2

0.01

0.2

nA

T

A

= +25°C

T

A

= T

MIN

to T

MAX

-10

10

NO_ _Off-Leakage 

Current (Notes 6 and 10)

I

NO_ _ (OFF)

V

NO_ _

= 3V, 0.5V;

V

COM

_ = 0.5V, 3V;

V+ = 3.6V

-0.2

0.01

0.2

nA

AUDIO PERFORMANCE

VIDEO PERFORMANCE

DYNAMIC TIMING WITH CLICKLESS MODE DISABLED

(Notes 8 and 12, Figure 2)

DYNAMIC TIMING WITH CLICKLESS MODE ENABLED

(Notes 8 and 12, Figure 2)

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

_______________________________________________________________________________________

5

pF

5

C

IN

Input Capacitance 

V

0.2

V

HYST

Input Hysteresis

UNITS

MIN

TYP

MAX

CONDITIONS

SYMBOL

PARAMETER

µA

-1

0.01

1

Digital inputs = 0 or V+

I

LEAK

Input Leakage Current

V+ = 3V

V+ = 3V

0.6

2

V

3

V+ = 5V

V

IH

Input High Voltage

V

0.8

V+ = 5V

V

IL

Input Low Voltage

ns

20 + 

300

0.1C

b

(Note 11)

t

F

SCL/SDA Fall Time

ns

20 + 

300

0.1C

b

(Note 11)

t

R

SCL/SDA Rise Time

µs

0.6

t

HIGH

Clock High Period

µs

1.3

t

LOW

Clock Low Period

ns

100

t

SU:DAT

Data Setup Time

µs

0

0.9

t

HD:DAT

Data Hold Time

µs

0.6

t

HD:STA

START Condition Hold Time

µs

1.3

t

BUF

Bus Free Time between Stop

and Start Condition 

kHz

DC

400

f

SCL

SCL Clock Frequency

V

V+

- 0.5 

I

SOURCE

= 0.5mA

V

OH

DOUT Output High Voltage

ns

0

t

DH

DIN to SCLK Hold

MHz

DC

2.1

f

OP

Operating Frequency

ns

100

t

DS

DIN to SCLK Setup

ns

20

200

C

LOAD

= 50pF

t

DO

SCLK Fall to Output Data Valid

I/O INTERFACE CHARACTERISTICS

(V+ = +2.7V to +5.25V, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.)

V

0.4

I

SINK

= 6mA

V

OL

Output Low Voltage

ns

100

t

CSS

CS to SCLK Rise Setup

µs

2

t

R

Rise Time (SCLK, DIN, CS)

ns

0

t

CSH

CS to SCLK Rise Hold

ns

200

t

CL

SCLK Pulse Width Low

µs

2

t

F

Fall Time (SCLK, DIN, CS)

µs

0.6

t

SU:STO

STOP Condition Setup Time

ns

200

t

CSW

CS High Pulse Width

ns

200

t

CH

SCLK Pulse Width High

DIGITAL INPUTS (SCLK, DIN, 

CS

, SCL, SDA, A0, A1)

DIGITAL OUTPUTS (DOUT, SDA)

2-WIRE INTERFACE TIMING 

(Figure 3)

3-WIRE TIMING 

(Figure 5)

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

6

_______________________________________________________________________________________

Note 2:

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

Note 3:

Guaranteed by design. Not subject to production testing.

Note 4:

R

ON

= R

ON(MAX)

- R

ON(MIN)

.

Note 5:

Resistance flatness is defined as the difference between the maximum and minimum on-resistance values, as measured

over the specified analog signal range.

Note 6:

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

A

= +25°C.

Note 7:

Off-isolation = 20 log [V

COM

_ / V

NO

_ _ ], V

COM

_ = output, V

NO

_ _ = input to off switch.

Note 8:

All timing is measured from the rising clock edge of the ACK bit for 2-wire, and from the rising edge of CS for 3-wire. Turn-

off time is defined at the output of the switch for a 0.5V change, tested with a 300

load to ground. Turn-on time is mea-

sured with a 5k

load resistor to GND. All timing is shown with respect to 20% V+ and 70% V+, unless otherwise noted.

Note 9:

Supply current can be as high as 2mA per switch during switch transitions in the clickless mode, corresponding to a 28mA

total supply transient current requirement.

Note 10:

Leakage testing for single-supply operation is guaranteed by testing with a single +5.25V supply.

Note 11:

C

b

= capacitance of one bus line in pF. Tested with C

b

= 400pF.

Note 12:

Typical values are for MAX4573/MAX4574 devices.

20

30

25

40

35

45

50

0

2

1

3

4

5

ON-RESISTANCE vs. V

COM

MAX4571-4 toc01

V

COM

 (V)

ON-RESISTANCE (

)

V+ = 2.7V

V+ = 3.3V

V+ = 5.0V

18

22

20

26

24

30

28

32

0

2

1

3

4

5

ON-RESISTANCE vs. 

V

COM 

AND TEMPERATURE

MAX4571-4 toc02

V

COM

 (V)

ON-RESISTANCE (

)

T

A

 = +85°C

T

A

 = +70°C

T

A

 = +25°C

T

A

 = -40°C

0.001

0.01

1

0.1

10

100

-40

0

-20

20

40

60

80

LEAKAGE CURRENT vs. TEMPERATURE

MAX4571-4 toc03

TEMPERATURE (°C)

CURRENT (nA)

COM_  OFF

NO_ _ OFF

NO_ _ ON

4.5

4.6

4.9

4.8

4.7

5.0

5.1

-40

0

-20

20

40

60

80

SUPPLY CURRENT vs. TEMPERATURE

MAX4571-4 toc04

TEMPERATURE (°C)

CURRENT (

µ

A)

-3

-2

1

0

-1

2

3

0

1

2

3

4

5

CHARGE INJECTION vs. V

COM

MAX4571-4 toc05

V

COM

 (V)

Q (pC)

0

100

400

300

200

500

600

-40

0

-20

20

40

60

80

ON/OFF TIME vs. TEMPERATURE

(HARD MODE)

MAX4571-4 toc06

TEMPERATURE (°C)

TIME (ns)

t

ON

, V+ = 5V

t

OFF

, V+ = 5V

t

ON

, V+ = 3V

t

OFF

, V+ = 3V

Typical Operating Characteristics

(V+ = +5V, T

= +25°C, unless otherwise noted.)

background image

TIME (50ns/div)

ON/OFF TIMES

(HARD MODE)

MAX4571-4 toc13

CS

5V/div

t

ON

1V/div

t

OFF

1V/div

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

_______________________________________________________________________________________

7

10,000

100,000

0.01

0.1

1

10

100

1000

TOTAL HARMONIC DISTORTION + NOISE 

vs. FREQUENCY

MAX4571-4 toc07

FREQUENCY (Hz)

THD + N (%)

600

 IN AND OUT

SIGNAL = 1V

RMS

10,000

100,000

-120

-60

0

-20

-40

-80

-100

10

100

1000

AUDIO FREQUENCY RESPONSE

MAX4571-4 toc08

FREQUENCY (Hz)

LOSS (dB)

600

 IN AND OUT

CROSSTALK

OFF-ISOLATION

-100

0.1

100

10

1

VIDEO FREQUENCY RESPONSE

0

-60

-80

-20

-40

MAX4571-4 toc09

FREQUENCY (MHz)

LOSS (dB)

INSERTION-LOSS

OFF-ISOLATION

CROSSTALK

50

 IN AND OUT

Typical Operating Characteristics (continued)

(V+ = 5V,T

A

= +25°C, unless otherwise noted.)

TIME (2ms/div)

ON/OFF TIMES

(SOFT MODE)

MAX4571-4 toc10

CS

5V/div

t

ON

t

OFF

1V/div

1V/div

TIME (500

µ

s/div)

SOFT MODE RISE TIME

MAX4571-4 toc11

AMPLITUDE (500mV/div)

TIME (500

µ

s/div)

SOFT MODE FALL TIME

MAX4571-4 toc12

AMPLITUDE (500mV/div)

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

8

_______________________________________________________________________________________

Pin Descriptions

FUNCTION

MAX4571

MAX4572

1, 3, 5, 7, 9,

11, 13, 22, 20,

18, 16 

Normally Open Terminals

PIN

1, 4, 7, 10

Normally Open Terminals

23

23

Ground

27

27

Data Input of 2-Wire Serial Interface

26

26

Clock Input of 2-Wire Serial Interface

25

25

LSB + 2 of 2-Wire Serial Interface Address Field

24

24

LSB + 1 of 2-Wire Serial Interface Address Field

28

28

Positive Supply Voltage

MAX4571

MAX4572

NO1–NO11

NAME

NO1A–NO4A

GND

GND

SDA

SDA

SCL

SCL

A1

A1

A0

A0

V+

V+

2, 4, 6, 8, 10,

12, 14, 21, 19,

17, 15

2, 5, 8, 11, 14,

21, 18, 15

Common Terminals

COM1–COM11

COM1–COM8

3, 6, 9, 12

Normally Open Terminals

NO1B–NO4B

13, 16

Normally Open Terminals

NO5, NO8

22, 19, 20, 17

Normally Open Terminals

NO6A, NO7A,

NO6B, NO7B

2, 4, 6, 8, 10,

12, 14, 21, 19,

17, 15

FUNCTION

MAX4573

MAX4574

2, 5, 8, 11, 14,

21, 18, 15

1, 3, 5, 7, 9,

11, 13, 22, 20,

18, 16 

Normally Open Terminals

PIN

1, 4, 7, 10

Normally Open Terminals

23

23

Ground

27

27

Data Output of 3-Wire Serial Interface

26

26

Clock Input of 3-Wire Serial Interface

25

25

Clock Input of 3-Wire Serial Interface

24

24

Chip Select of 3-Wire Serial Interface

Common Terminals

COM1–COM11

COM1–COM8

3, 6, 9, 12

Normally Open Terminals

NO1B–NO4B

13, 16

Normally Open Terminals

28

28

Positive Supply Voltage

NO5, NO8

MAX4573

MAX4574

NO1–NO11

NAME

NO1A–NO4A

GND

GND

DOUT

DOUT

DIN

DIN

SCLK

SCLK

CS

CS

22, 19, 20, 17

Normally Open Terminals

NO6A, NO7A,

NO6B, NO7B

V+

V+

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

_______________________________________________________________________________________

9

Figure 2.  Switching Time

DECODER/

CONTROLLER

DECODER/

CONTROLLER

2/3

SIGNAL

GENERATOR 0dBm

V+

10nF

ANALYZER

NO_ _ 

R

L

GND

COM_

V+

2/3

SIGNAL

GENERATOR 0dBm

V+

10nF

a)  Off-Isolation

b)  Crosstalk

NO2

GND

COM1

NO1

50

COM2

N.C.

ANALYZER

R

L

V+

MAX4571

MAX4572

MAX4573

MAX4574

MAX4571

MAX4572

MAX4573

MAX4574

R

L

300

C

L

35pF

V

OUT

NO

V+

V+

GND

C

L

 INCLUDES FIXTURE AND STRAY CAPACITANCE

V

OUT

 = V

COM

 [R

/ (R

+ R

ON

)]

2 OR 3

SERIAL

INTERFACE

DECODER/

CONTROLLER

µ

P

3-Wire

2-Wire

SCL

CS

3V

0

V

OUT

0

V

OUT

0

3V

0

V

OUT

0

V

OUT

0

50%

50%

t

ON

t

ON

t

OFF

t

OFF

0.9 

 V

OUT

0.1 

 V

OUT

0.9 

 V

OUT

0.1 

 V

OUT

t

r

 < 20ns

t

f

 < 20ns

ACKNOWLEDGE

BIT

NO_ _

COM_

MAX4571

MAX4572

MAX4573

MAX4574

Figure 1.  Off-Isolation and Crosstalk

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

10

______________________________________________________________________________________

Detailed Description

The MAX4571–MAX4574 are serial-interface controlled

switches with soft-mode “clickless” and hard-mode oper-

ating capability. The MAX4571/MAX4573 contain 11

SPST switches, while the MAX4572/MAX4574 contain

two SPST switches and six SPDT switches. The SPDT

switches are actually 2-to-1 multiplexers, in that each

SPDT is really two independent SPST switches with a

common node, as shown in the 

Pin Configurations. Each

switch is controlled independently by either the SPI or

I

2

C interface.

Audio off-isolation is -90dB at 20kHz, crosstalk is at

least -90dB at 20kHz, and video off-isolation is at least

-50dB at 10MHz. 

Each switch of any device may be set to operate in

either soft or hard mode. In soft mode, the switching

transition is slowed to avoid the audible “clicking” that

can occur when switches are used to route audio sig-

nals. In hard mode, the switches are not slowed down,

making this mode useful when a faster response is

required. If a new command is issued while any soft-

mode switch is transitioning, the switch transition time

is decreased so it reaches its final state before the new

command is executed. Soft mode is the power-up

default state for all switches. Switches in the same

mode are guaranteed to be break-before-make relative

to each other. Break-before-make does not apply

between switches operating in different modes. 

These devices operate from a single supply of +2.7V to

+5.25V. The MAX4571/MAX4572 feature a 2-wire, I

2

C-

compatible serial interface, and the MAX4573/

MAX4574 feature a 3-wire, SPI/QSPI/MICROWIRE-com-

patible serial interface.

Applications Information

Switch Control

The MAX4571–MAX4574 have a common command

and control-bit structure, the differences being only in

the interface type (2-wire or 3-wire) and in the switch

configurations.

The SWITCHSET command controls the open/closed

states of the various switches. MODESET controls

soft/hard-mode states of the switches. There are also

NO_OP and RESET commands. The NO_OP command

is useful for daisy-chaining multiple 3-wire parts. The

RESET command places a device in a state identical to

its power-up state, with all switches open and in soft

switching mode. 

Table 1 shows the configuration of the command bits

and their related commands. Table 2 shows the config-

uration of the data bits and their related switches. The

arrangement of the command bits and the data bits

depends on the interface type (2-wire or 3-wire). After a

SWITCHSET command is issued, a logic 1 in any data-

bit location closes the associated switch, while a logic 0

opens it. After a MODESET command, a logic 1 in any

data-bit location sets the associated switch into hard

mode, while a logic 0 sets it into soft mode.

2-Wire Serial Interface

The MAX4571/MAX4572 use a 2-wire, I

2

C-compatible

serial interface requiring only two I/O lines of a stan-

dard microprocessor port for communication. These

devices use the SendByte™ and WriteWord™ proto-

cols. The SendByte protocol is used only for the RESET

command. The WriteWord protocol is used for the

MODESET and SWITCHSET commands.

The first byte of any 2-wire serial-interface transaction is

always the address byte. To address a given chip, the

A0 and A1 bits in the address byte (Table 3) must dupli-

cate the values present at the A0 and A1 pins of that

chip, and the rest of the address bits must be config-

ured as shown in Table 3. Connect the A0 and A1 pins

to V+ or to GND, or drive them with CMOS logic levels.

The second byte is the command byte. The possible

commands are RESET, MODESET, and SWITCHSET.

RESET sets all switches to the initial power-up state

(open and in soft switching mode). The RESET com-

mand is executed on the rising clock edge of the

acknowledge bit after the command byte. The MODE-

SET and SWITCHSET commands are each followed by

two data bytes. The first data byte is buffered so all the

data latches switch together. MODESET and SWITCH-

SET are executed on the rising clock edge of the

acknowledge bit after the second data byte. Table 3

details the 2-wire interface data structure. Figures 3

and 4 and the 

I/O Interface Characteristics detail the

timing of the 2-wire serial-interface protocol. All bytes of

the transmission, whether address, command, or data,

are sent MSB first.

The MAX4571/MAX4572 are receive-only devices and

must be controlled by a bus master device. A bus mas-

ter signals the beginning of a transmission with a start

condition by transitioning SDA from high to low while

SCL is high. The slave devices monitor the serial bus

continuously, waiting for a start condition followed by an

address byte. When a device recognizes its address

byte, it acknowledges by pulling the SDA line low for

one clock period; it is then ready to accept command

and data bytes. The device then issues a similar

acknowledgment after the command byte, and again

after each data byte. When the master has finished

SendByte and WriteWord are trademarks of Philips Corp.

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

______________________________________________________________________________________

11

Table 1. Command Bit Mapping

Table 2. Data-Bit Switch Control

X = Don’t care

MSB

MSB - 1

COMMAND

DESCRIPTION

0

0

RESET

Sets all switches open and in soft switching mode. 

0

1

MODESET

Sets specified switches to soft or hard mode. 

1

0

NO_OP

No Operation.

1

1

SWITCHSET

Sets specified switches open or closed. 

D13

X

SW8

D12

X

SW5

D11

X

SW7B

D10

15, 16

SW7A

D8

19, 20

SW6A

X

X

X

SW11

SW9

15, 16

13, 14

17, 18

18, 19

21, 22

D7

21, 22

SW4B

D6

13, 14

SW4A

D5

11, 12

SW3B

D4

9, 10

SW3A

D3

7, 8

SW2B

SW8

SW7

SW6

SW5

SW4

11, 12

10, 11

8, 9

7, 8

5, 6

D2

5, 6

SW2A

D1

3, 4

SW1B

D0 (LSB)

1, 2

SW1A

SW3

SW2

SW1

4, 5

2, 3

1, 2

DATA BIT

SWITCH

SWITCH

D9

17, 18

SW6B

SW10

20, 21

SWITCH TERMINALS

SWITCH TERMINALS

MAX4572/MAX4574

MAX4571/MAX4573

communicating with the slave, it issues a stop condition

by transitioning SDA from low to high while SCL is high.

The bus is then free for another transmission.

3-Wire Serial Interface 

The MAX4573/MAX4574 use a 3-wire SPI/QSPI/

MICROWIRE-compatible serial interface. An active-low

chip-select pin, CS, enables the device to receive data

from the serial input pin, DIN. Command and data infor-

mation are clocked in on the rising edge of the serial-

clock signal (SCLK) MSB first. A total of 16 bits are

needed in each write cycle. The write cycle allows two

8-bit-wide transfers if CS remains low for the entire 16

bits. The command code is contained in the two MSBs

of the 16-bit word. The remaining bits control the

switches as shown in Table 4. While shifting in the seri-

al data, the device remains in its original configuration.

A rising edge on CS latches the data into the

MAX4573/MAX4574 internal registers, initiating the

device’s change of state. Table 4 shows the details of

the 3-wire interface data structure. 

Figures 5 and 6 and the 

I/O Interface Characteristics

show the timing details of the 3-wire interface. If the 

two command bits initiate a SWITCHSET command, a

logic 1 in a switch control location closes the associat-

ed switch, while a logic 0 opens it. If the command bits

initiate a MODESET command, a logic 1 in a switch

control location sets the associated switch into hard

mode, while a logic 0 sets it into soft, “clickless” mode.

For command-bit configurations, see Table 1.

Using Multiple Devices

There are two ways to connect multiple devices to the

same 3-wire serial interface. The first involves using the

DOUT pin. DOUT presents a copy of the last bit of the

internal shift register, useful for daisy-chaining multiple

devices. Data at DOUT are simply the input data

delayed by 16 clock cycles, appearing synchronous

with SCLK’s falling edge. After CS goes high, DOUT

holds the last bit in the shift register until new data are

shifted into DIN. For a simple interface using several

MAX4573/MAX4574 devices, daisy-chain the shift reg-

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

12

______________________________________________________________________________________

Address Byte

Command Byte (RESET)

MSB

S

R

T

0

1

1

0

1

A

1

A

0

0

A

C

K

0

0

X

X

X

X

X

X

A

C

K

S

T

P

X

X

X

X

X

SW

11

SW

10

SW

9

A

C

K

SW

8

SW

7

SW

6

SW

5

SW

4

SW

3

SW

2

SW

1

A

C

K

S

T

P

X

X

SW

8

SW

5

SW

7B

SW

7A

SW

6B

SW

6A

A

C

K

SW

4B

SW

4A

SW

3B

SW

3A

SW

2B

SW

2A

SW

1B

SW

1A

A

C

K

S

T

P

X

X

SW

8

SW

5

SW

7B

SW

7A

SW

6B

SW

6A

A

C

K

SW

4B

SW

4A

SW

3B

SW

3A

SW

2B

SW

2A

SW

1B

SW

1A

A

C

K

S

T

P

X

X

X

X

X

SW

11

SW

10

SW

9

A

C

K

SW

8

SW

7

SW

6

SW

5

SW

4

SW

3

SW

2

SW

1

A

C

K

S

T

P

S

R

T

0

1

1

0

1

A

1

A

0

0

A

C

K

1

 

1

X

X

X

X

X

X

A

C

K

S

R

T

0

1

1

0

1

A

1

A

0

0

A

C

K

0

1

X

X

X

X

X

X

A

C

K

LSB

LSB

LSB

MSB

LSB

Command Byte (SWITCHSET)

Command Byte (MODESET)

MSB

LSB

MSB

LSB

Address Byte

First Data Byte

MSB

MSB

LSB

Second Data Byte

MSB

LSB

First Data Byte

MSB

LSB

Second Data Byte

MSB

MSB

LSB

First Data Byte

MSB

LSB

Second Data Byte

MSB

MSB

Address Byte

MSB

MSB

LSB

First Data Byte

MSB

LSB

Second Data Byte

MSB

MSB

MSB

MSB

X = Don't Care

SRT = Start Condition

ACK = Acknowledge Condition

STP = Stop Condition

Logic "0" in any data bit location places the associated switch open or in soft (clickless) switching mode.

Logic "1" in any data bit location places the associated switch closed or in hard switching mode.

For command bit configuration see Table 1.

RESET

 

Command

SWITCHSET

 

Command

MAX4571

MAX4572

MAX4571

MAX4572

MODESET

 

Command

Table 3. 2-Wire Serial-Interface Data Format

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

______________________________________________________________________________________

13

SCL

SDA

t

LOW

t

HIGH

t

F

t

R

t

HD

STA

t

HD

DAT

t

HD

STA

t

SU

DAT

t

SU

STA

t

BUF

t

SU

STO

START CONDITION

STOP CONDITION

REPEATED START CONDITION

START CONDITION

20%

70%

20%

70%

20%

70%

20%

70%

20%

70%

20%

70%

20%

70%

70%

20%

70%

70%

70%

Figure 3.  2-Wire Serial-Interface Timing Diagram

START CONDITION

STOP CONDITION

FIRST DATA BYTE

SECOND DATA BYTE

COMMAND BYTE

ADDRESS BYTE

SCL

SDA

MSB

MSB

MSB

MSB

LSB

LSB

LSB

LSB

ACK

ACK

ACK

ACK

Figure 4.  A Complete 2-Wire Serial-Interface Transmission

Table 4.  3-Wire Serial-Interface Data Format

D15

C1

D14

C0

D12

X

D13

X

D10

SW11

D11

D8

SW9

X

D9

SW10

D6

SW7

D7

D4

SW5

SW8

D5

SW6

D2

SW3

MAX4573 (11 SPST)

D3

D0

SW1

SW4

D1

SW2

COMMAND

SWITCH CONTROL

MSB                                                                                                                                                                                                 LSB

COMMAND

D14

C0

D15

D12

SW5

C1

D13

SW8

D10

SW7A

D11

D8

SW6A

SW7B

SWITCH CONTROL

D9

SW6B

D6

SW4A

D7

D4

SW3A

SW4B

D5

SW3B

D2

SW2A

MAX4574 (6 SPDT + 2 SPST)

D3

D0

SW1A

SW2B

MSB                                                                                                                                                                                                 LSB

D1

SW1B

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

14

______________________________________________________________________________________

SCLK

DIN

DOUT

t

CSS

t

CL

t

CH

t

CSW

t

CSO

t

DO

t

CSH

t

DH

t

DS

D15

D14

D1

D0

CS

20%

20%

20%

20% 20%

20%

20%

70%

70%

70%

70%

Figure 5.  3-Wire Serial-Interface Timing Diagram

SCLK

DIN

CS

LSB  FROM

PREVIOUS WRITE

MSB  FROM

PREVIOUS WRITE

COMMAND

EXECUTED

9

Q15........

MSB

D15 D14 D13....

.........00

8

16

1

DOUT

LSB

D1

D2

D0....

Figure 6.  A Complete 3-Wire Serial-Interface Transmission

isters by connecting DOUT of the first device to DIN of

the second, etc. Connect the CS pins of all devices

together. Data are shifted through the MAX4573/

MAX4574s in series. When CS is brought high, all

devices are updated simultaneously. If any of the

devices in the chain are to be left unchanged, use a

NO_OP command for that device, as shown in Table 1. 

An alternate way of connecting multiple devices is to

decode the CS line. In this case the DOUT pin is not

used and the DIN pins of all devices are connected

together. Address decode logic individually controls the

CS line of each device. When a device is to be selected

its CS line is brought low, data are shifted in, and its CS

is then brought high to execute the command.

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video Switches

______________________________________________________________________________________

15

TRANSISTOR COUNT: 5397

___________________Chip Information

Pin Configurations (continued)

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

V+

SDA (DOUT)

SCL (DIN)

A1 (SCLK)

A0 (CS)

GND

COM8

NO6A

COM6

NO6B

NO7A

COM7

NO7B

NO8

COM5

NO5

NO4B

COM4

NO4A

NO3B

COM3

NO3A

NO2B

COM2

NO2A

NO1B

COM1

NO1A

QSOP/SSOP/SO

( ) ARE FOR MAX4574

TOP VIEW

MAX4572/MAX4574

Package Information

QSOP.EPS

background image

MAX4571–MAX4574

Serially Controlled, Clickless 

Audio/Video 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

© 1999 Maxim Integrated Products 

Printed USA

is a registered trademark of Maxim Integrated Products.

Package Information (continued)

SSOP.EPS

SOICW.EPS