Datasheet DS3668N Datasheet (NSC)

DS3668 Quad Fault Protected Peripheral Driver

DS3668 Quad Fault Protected Peripheral Driver

March 1995

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 out­put 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 protec­tion 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 trig­gered 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 al­lows it to be driven directly by a MOS device. The outputs
are capable of sinking 600 mA each and offer a 70V break­down. 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 incor­porates 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 in­creased 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 currentÐ600 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

Truth Table

Dual-In-Line Package

IN EN OUT

HH L
LH Z
HL Z
LL Z

e

H

High state

e

L

Low state

e

Z

High impedance state

Top View

TL/F/5225– 1

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

TL/F/5225

Order Number DS3668N

See NS Package Number N16E

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

Operating Conditions

Min Max Units

Supply Voltage 4.75 5.25 V

Ambient Temperature 0 70

Input Voltage 15V

Output Voltage 70V

Continuous Power Dissipation

@

25§C Free-Air

Storage Temperature Range

(5)

2075 mW

b

65§Ctoa150§C

Lead Temperature (Soldering, 4 seconds) 260

Electrical Characteristics (Notes 2 and 3)

Symbol Parameter Conditions Min Typ Max Units

V

V

I

IH

I

IL

V

V

I

CEX

V

I

R

I

CC

I

TH

IH

IL

IK

OL

F

Input High Voltage 2.0 V

Input Low Voltage 0.8 V

Input High Current V

Input Low Current V

Input Clamp Voltage I

Output Low Voltage I

Output Leakage Current V

Diode Forward Voltage I

Diode Leakage Current V

e

5.25V, V

IN

e

0.4V

IN

eb

12 mA

I

e

300 mA 0.2 0.7 V

L

e

I

600 mA (Note 4) 0.55 1.5 V

L

e

70V, V

CE

e

800 mA 1.2 1.6 V

F

e

70V 100 mA

R

e

5.25V 1.0 20 mA

CC

g

10 mA

b

0.8

e

0.8V 100 mA

IN

b

1.5 V

Supply Current All Inputs High 62 80 mA

All Inputs Low 20 mA

Protection Circuit
Threshold Current

1 1.4 A

C

§

Switching Characteristics (Note 2)

Symbol Parameter Conditions Min Typ Max Units

t

PHL

t

PLH

t

FZ

t

RL

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
values are for T

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

Turn On Delay R

Turn Off Delay R

Protection Enable Delay
(after Detection of Fault)

Input Low Time for
Protection Circuit Reset

e

A

25§C and V

e

5.0V.

CC

C free-air temperature, derate linearly to 1328 mW@70§C@the rate of 16.6 mW/§C.

§

e

L

e

L

e

60X,V

60X,V

30V 0.3 1.0 ms

L

e

30V 2 10.0 ms

L

612 ms

1.0 ms

Ctoa70§C temperature range and the 4.75V to 5.25V power supply range. All typical

§

2

AC Test Circuit

Switching Waveforms

TL/F/5225– 3

*Includes probe and jig capacitance.

TL/F/5225– 2

Typical Application

Stepping Motor Driver

*L1, L2, L3, L4 are the windings of a bifilar stepping motor.

**V

is the supply voltage of the motor.

MOTOR

Protection Circuit Block Diagram

TL/F/5225– 4

TL/F/5225– 5

3

Physical Dimensions inches (millimeters)

DS3668 Quad Fault Protected Peripheral Driver

Molded Dual-In-Line Package (N)

Order Number DS3668N

NS Package Number N16E

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