4 IN 鈥?/div>
1
2
3
4
5
6
7
14
13
12
11
10
9
8
BAT GND
1 OUT
2 OUT
3 OUT
4 OUT
BAT NEG
4 IN +
description
The DS3680 telephone relay driver is a monolithic
integrated circuit designed to interface 鈥?48-V
relay systems to TTL or other systems in
telephone applications. It is capable of sourcing
up to 50 mA from standard 鈥?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
鹵
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擄C to 70擄C.
symbol (each driver)
BAT GND
IN +
IN 鈥?/div>
+
鈥?/div>
OUT
BAT NEG
schematic diagram (each driver)
IN +
15 k鈩?/div>
BAT GND
IN 鈥?/div>
OUT
BAT NEG
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.
Copyright
漏
1995, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1
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