Serially Controlled, Low-Voltage,

8-Channel/Dual 4-Channel Multiplexers

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13

Pin Description

Note: NO and COM pins are identical and interchangeable. Either may be considered as an input or an output; signals pass equally

well in either direction.

• • •

• • •

• • •

• • •

• • •

SCLK

DIN

DOUT

COM-OUT

CS

Figure 1. Timing Diagram

1

Serial Clock Digital Input

2

Positive Analog Supply Voltage Input

3

Serial Data Digital Input

5

Common Analog Switch (mux output)

6–13

Normally Open Analog Switch Inputs 0–7

—

Common Analog Switch “A” (mux output)

—

Normally Open Analog Switch “A” Inputs 0–3

—

Normally Open Analog Switch “B” Inputs 0–3

—

Common Analog Switch “B” (mux output)

4

Ground. Connect to digital ground. (Analog signals have

no ground reference; they are limited to V+ and V-.)

1

SCLK

2

V+

3

DIN

5

COM

6–9, 11–14

NO0–NO7

—

COMA

—

NO0A–NO3A

—

NO3B–NO0B

—

COMB

4

GND

15

Negative Analog Supply Voltage Input. Connect to GND

for single-supply operation.

16

Serial Data Digital Output. Output high is V+.

17

RESET Input. Connect to logic high (or V+) for normal operation.

Drive low to set all switches off and set internal shift registers to 0.

18

Chip-Select Digital Input (Figure 1)

17

V-

18

DOUT

19

RESET

20

CS

14

No Connect, not internally connected.

10, 15, 16

N.C.

MAX349

SSOP

DIP/SO

NAME

FUNCTION

1

2

3

—

—

5

6–9

10–13

14

4

1

2

3

—

—

5

6–9

11–14

15

4

15

16

17

18

17

18

19

20

—

10, 16

MAX350

SSOP

DIP/SO

PIN