Data Sheet

ADG738/ADG739

Rev. A | Page 7 of 20

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

Figure 4. ADG738 Pin Configuration

Table 5. ADG738 Pin Function Descriptions

Pin No.

Mnemonic

Description

1

SCLK

Serial Clock Input. Data is clocked into the input shift register on the falling edge of the serial clock input.

These devices can accommodate serial input rates of up to 30 MHz.

2

RESET

Active Low Control Input. This pin clears the input register and turns all switches to the off condition.

3

DIN

Serial Data Input. Data is clocked into the 8-bit input register on the falling edge of the serial clock input.

4, 5, 6, 7

S1, S2, S3, S4

Source. May be an input or output.

8

D

Drain. May be an input or output.

9, 10, 11, 12

S8, S7, S6, S5

Source. May be an input or output.

13

V

DD

Power Supply Input. These parts can be operated from a supply of 2.7 V to 5.5 V.

14

GND

Ground Reference.

15

DOUT

Data Output. This allows a number a parts to be daisy-chained. Data is clocked out of the input shift

register on the rising edge of SCLK. This is an open drain output, which should be pulled to the supply

with an external resistor.

16

SYNC

Active Low Control Input. This is the frame synchronization signal for the input data. When SYNC goes low,

it powers on the SCLK and DIN buffers and the input shift register is enabled. Data is transferred on the

falling edges of the following clocks. Taking SYNC high updates the switch conditions.

SCLK

RESET

S2

S3

S4

S1

D

SYNC

DOUT

S5

S6

S7

GND

S8

DIN

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

ADG738

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