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DS3668N

更新时间： 2024-11-24 22:49:07
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4页 100K
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Quad Fault Protected Peripheral Driver

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DS3668N 数据手册

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March 1995  
DS3668 Quad Fault Protected Peripheral Driver  
General Description  
Applications  
Y
Relay drivers  
The DS3668 quad peripheral driver is designed for those  
applications where low operating power, high breakdown  
voltage, high output current and low output ON voltage are  
required. Unlike most peripheral drivers available, a unique  
fault protection circuit is incorporated on each output. When  
the load current exceeds 1.0A (approximately) on any out-  
put for more than a built-in delay time, nominally 12 ms, that  
output will be shut off by its protection circuitry with no effect  
on other outputs. This condition will prevail until that protec-  
tion circuitry is reset by toggling the corresponding input or  
the enable pin low for at least 1.0 ms. This built-in delay is  
Y
Solenoid drivers  
Y
Hammer drivers  
Y
Stepping motor drivers  
Y
Triac drivers  
Y
LED drivers  
Y
High current, high voltage drivers  
Y
Level translators  
Y
Fiber optic LED drivers  
provided to ensure that the protection circuitry is not trig- Features  
Y
gered by turn-on surge currents associated with certain  
kinds of loads.  
Output fault protection  
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
High impedance TTL compatible inputs  
High output currentÐ600 mA per output  
The DS3668’s inputs combine TTL compatibility with high  
input impedance. In fact, its extreme low input current al-  
lows it to be driven directly by a MOS device. The outputs  
are capable of sinking 600 mA each and offer a 70V break-  
down. However, for inductive loads the output should be  
clamped to 35V or less to avoid latch up during turn off  
(inductive fly-back protection Ð refer AN-213). An on-chip  
clamp diode capable of handling 800 mA is provided at  
each output for this purpose. In addition, the DS3668 incor-  
porates circuitry that guarantees glitch-free power up or  
down operation and a fail-safe feature which puts the output  
in a high impedance state when the input is open.  
No output latch-up at 35V  
@
Low output ON voltage (550 mV typ  
High breakdown voltage (70V)  
Open collector outputs  
600 mA)  
Output clamp diodes for inductive fly-back protection  
NPN inputs for minimal input currents (1 mA typical)  
Low operating power  
Standard 5V power supply  
Power up/down protection  
Fail-safe operation  
The molded package is specifically constructed to allow in-  
creased power dissipation over conventional packages. The  
four ground pins are directly connected to the device chip  
with a special copper lead frame. When the quad driver is  
soldered into a PC board, the power rating of the device  
improves significantly.  
2W power package  
Pin-for-pin compatible with SN75437  
Connection Diagram  
Truth Table  
Dual-In-Line Package  
IN  
EN  
OUT  
H
L
H
H
L
L
Z
Z
Z
H
L
L
e
e
e
H
L
High state  
Low state  
Z
High impedance state  
Order Number DS3668N  
See NS Package Number N16E  
TL/F/5225–1  
Top View  
C
1995 National Semiconductor Corporation  
TL/F/5225  
RRD-B30M105/Printed in U. S. A.  
1234

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