1/7

June 2001

s

OPERATES 4 LATCHES RELAIS, 1 SINGLE

SIDE STABLE RELAY AND 1 LED

s

VERY LOW POWER CONSUMPTION

s

TTL COMPATIBLE INPUT THRESHOLDS

s

IMPROVED LATCH-UP IMMUNITY UP TO

300mA

s

OPERATING VOLTAGE RANGE:

s

AVAILABLE IN TSSOP-20 PACKAGE

DESCRIPTION

The device is a relais driver for line card

application. It is able to operate four latching

relais, one single side stable relay and one LED

connected either to GND or VCC. All the outputs

can be set to LOW with the RST input as shown in

the true table. All inputs and outputs are equipped

with protection circuits against static discharge,

giving them 2KV ESD immunity and transient

excess voltage.

PIN DESCRIPTION

PIN No

SYMBOL

NAME AND FUNCTION

1

RST

Master Reset

2

IN1A

Input of 1st latched relay drv

3

IN1B

Input of 1st latched relay drv

4

IN2A

Input of 2nd latched relay drv

5

IN2B

Input of 2nd latched relay drv

6

IN3A

Input of 3rd latched relay drv

7

IN3B

Input of 3rd latched relay drv

8

IN4

Input of 1st relay driver

9

IN5

Input LED driver

10

GND

Ground (0V)

11

NC

Not Connected

12

OUT5

Output LED driver

13

OUT4

Output of 1st relay driver

14

OU3B

Output of 3rd latched relay drv

15

OU3A

Output of 3rd latched relay drv

16

OU2B

Output of 2nd latched relay drv

17

OU2A

Output of 2nd latched relay drv

18

OU1B

Output of 1st latched relay drv

19

OU1A

Output of 1st latched relay drv

20

Positive Supply Voltage

74ACT8244

RELAY DRIVER IC

ORDER CODES

PACKAGE

TUBE

T & R

TSSOP

74ACT8244TTR

TSSOP

PIN CONNECTION