DS3680 Quad Negative Voltage Relay Driver
March 1995
DS3680 Quad Negative Voltage Relay Driver
General Description
The DS3680 is a quad high voltage negative relay driver
designed to operate over wide ranges of supply voltage
common-mode voltage and ambient temperature with
50 mA sink capability These drivers are intended for switch-
ing the ground end of loads which are directly connected to
the negative supply such as in telephone relay systems
Since there may be considerable noise and IR drop be-
tween logic ground and negative supply ground in many ap-
plications these drivers are designed to operate with a high
common-mode range (
g
20V referenced to negative supply
ground) Each driver has a common-mode range separate
from the other drivers in the package which pemits input
signals from more than one element of the system
With low differential input current requirements (typically
100
mA)
these drivers are compatible with TTL LS and
CMOS logic Differential inputs permit either inverting or
non-inverting operation
The driver outputs incorporate transient suppression clamp
networks which eliminate the need for external networks
when used in applications of switching inductive loads A
fail-safe feature is incorporated to insure that if the
a
IN
input or both inputs are open the driver will be OFF
Features
Y
Y
Y
Y
Y
Y
Y
b
10V to
b
60V operation
Quad 50 mA sink capability
TTL LS COMS or voltage comparator input
High input common-mode voltage range
Very low input current
Fail-safe disconnect feature
Built-in output clamp diode
Connection Diagram
Dual-In-Line Package
Logic Diagram
TL F 5821 – 1
Top View
Order Number DS3680J DS3680M or DS3680N
See NS Package Number J14A M14A N14A
TL F 5821 – 2
Truth Table
Differential Inputs
V
ID
t
2V
V
ID
s
0 8V
Open
Outputs
On
Off
Off
C
1995 National Semiconductor Corporation
TL F 5821
RRD-B30M105 Printed in U S A
NSC [ NATIONAL SEMICONDUCTOR ]
