TL F 5225
DS3668
Quad
Fault
Protected
Peripheral
Driver
March 1995
DS3668 Quad Fault Protected Peripheral Driver
General Description
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
provided to ensure that the protection circuitry is not trig-
gered by turn-on surge currents associated with certain
kinds of loads
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
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
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
Applications
Y
Relay drivers
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
Features
Y
Output fault protection
Y
High impedance TTL compatible inputs
Y
High output current
600 mA per output
Y
No output latch-up at 35V
Y
Low output ON voltage (550 mV typ
600 mA)
Y
High breakdown voltage (70V)
Y
Open collector outputs
Y
Output clamp diodes for inductive fly-back protection
Y
NPN inputs for minimal input currents (1 mA typical)
Y
Low operating power
Y
Standard 5V power supply
Y
Power up down protection
Y
Fail-safe operation
Y
2W power package
Y
Pin-for-pin compatible with SN75437
Connection Diagram
Dual-In-Line Package
TL F 5225 1
Top View
Truth Table
IN
EN
OUT
H
H
L
L
H
Z
H
L
Z
L
L
Z
H
e
High state
L
e
Low state
Z
e
High impedance state
Order Number DS3668N
See NS Package Number N16E
C1995 National Semiconductor Corporation
RRD-B30M105 Printed in U S A
Absolute Maximum Ratings
(Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7 0V
Input Voltage
15V
Output Voltage
70V
Continuous Power Dissipation
25 C Free-Air
(5)
2075 mW
Storage Temperature Range
b
65 C to
a
150 C
Lead Temperature (Soldering 4 seconds)
260
Operating Conditions
Min
Max
Units
Supply Voltage
4 75
5 25
V
Ambient Temperature
0
70
C
Electrical Characteristics
(Notes 2 and 3)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
IH
Input High Voltage
2 0
V
V
IL
Input Low Voltage
0 8
V
I
IH
Input High Current
V
IN
e
5 25V V
CC
e
5 25V
1 0
20
m
A
I
IL
Input Low Current
V
IN
e
0 4V
g
10
m
A
V
IK
Input Clamp Voltage
I
I
e b
12 mA
b
0 8
b
1 5
V
V
OL
Output Low Voltage
I
L
e
300 mA
0 2
0 7
V
I
L
e
600 mA (Note 4)
0 55
1 5
V
I
CEX
Output Leakage Current
V
CE
e
70V V
IN
e
0 8V
100
m
A
V
F
Diode Forward Voltage
I
F
e
800 mA
1 2
1 6
V
I
R
Diode Leakage Current
V
R
e
70V
100
m
A
I
CC
Supply Current
All Inputs High
62
80
mA
All Inputs Low
20
mA
I
TH
Protection Circuit
1
1 4
A
Threshold Current
Switching Characteristics
(Note 2)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t
PHL
Turn On Delay
R
L
e
60X V
L
e
30V
0 3
1 0
m
s
t
PLH
Turn Off Delay
R
L
e
60X V
L
e
30V
2
10 0
m
s
t
FZ
Protection Enable Delay
6
12
m
s
(after Detection of Fault)
t
RL
Input Low Time for
1 0
m
s
Protection Circuit Reset
Note 1
``Absolute Maximum Ratings'' are those values beyond which the safety of the device cannot be guaranteed They are not meant to imply that the device
should be operated at these limits The table of ``Electrical Characteristics'' provides conditions for actual device operation
Note 2
Unless otherwise specified min max limits apply across the 0 C to
a
70 C temperature range and the 4 75V to 5 25V power supply range All typical
values are for T
A
e
25 C and V
CC
e
5 0V
Note 3
All currents into device pins are shown as positive all currents out of device pins are shown as negative all voltages are referenced to ground unless
otherwise specified All values shown as max or min are so classified on absolute value basis
Note 4
All sections of this quad circuit may conduct rated current simultaneously however power dissipation averaged over a short interval of time must fall within
specified continuous dissipation ratings
Note 5
For operation over 25 C free-air temperature derate linearly to 1328 mW
70 C
the rate of 16 6 mW C
2
AC Test Circuit
TL F 5225 2
Includes probe and jig capacitance
Switching Waveforms
TL F 5225 3
Typical Application
Stepping Motor Driver
TL F 5225 4
L1 L2 L3 L4 are the windings of a bifilar stepping motor
V
MOTOR
is the supply voltage of the motor
Protection Circuit Block Diagram
TL F 5225 5
3
DS3668
Quad
Fault
Protected
Peripheral
Driver
Physical Dimensions
inches (millimeters)
Molded Dual-In-Line Package (N)
Order Number DS3668N
NS Package Number N16E
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
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2 A critical component is any component of a life
systems which (a) are intended for surgical implant
support device or system whose failure to perform can
into the body or (b) support or sustain life and whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system or to affect its safety or
with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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