DS3680

QUAD TELEPHONE RELAY DRIVER

SLRS014C – MARCH 1986 – REVISED SEPTEMBER 1995

Copyright

1

POST OFFICE BOX 655303

and Fairchild

µA3680

description

The DS3680 telephone relay driver is a monolithic

integrated circuit designed to interface – 48-V

relay systems to TTL or other systems in

telephone applications. It is capable of sourcing

up to 50 mA from standard – 52-V battery power.

To reduce the effects of noise and IR drop between

logic ground and battery ground, these drivers are

designed to operate with a common-mode input

range of

±20 V referenced to battery ground. The

common-mode input voltages for the four drivers

can be different, so a wide range of input elements

can be accommodated. The high-impedance

inputs are compatible with positive TTL and

CMOS levels or negative logic levels. A clamp

network is included in the driver outputs to limit

high-voltage transients generated by the relay coil

during switching. The complementary inputs

ensure that the driver output is off as a fail-safe

condition when either output is open.

The DS3680 is characterized for operation from

0

°C to 70°C.

IN +

IN –

15 k

Ω

OUT

BAT GND

BAT NEG

schematic diagram (each driver)

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1 IN +

1 IN –

2 IN –

2 IN +

3 IN +

3 IN –

4 IN –

BAT GND

1 OUT

2 OUT

3 OUT

4 OUT

BAT NEG

4 IN +

D OR N PACKAGE

(TOP VIEW)

symbol (each driver)

BAT GND

+

–

OUT

BAT NEG

IN +

IN –

All resistor values shown are nominal.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.