Datasheet DS55493, DS75493 Datasheet (National Semiconductor)

DS55493/DS75493 Quad LED Segment Driver

DS55493/DS75493 Quad LED Segment Driver

April 1990

General Description

The DS55493/DS75493 is a quad LED segment driver. It is
designed to interface between MOS IC’s and LED’s. An ex­ternal resistor is required for each segment to drive the out­put current which is approximately equal to 0.7V/R
relatively constant, independent of supply variations. Blank-

L

and is

ing can be achieved by taking the chip enable (CE) to a
logical ‘‘1’’ level.

Schematic and Connection Diagrams

Dual-In-Line Package

Features

Y

Low voltage operation

Y

Low input current for MOS compatibility

Y

Low standby power

Y

Display blanking capability

Y

Output current regulation

Y

Quad high gain circuits

Truth Table

TL/F/7561– 1

CE V

I

IN

OUT

01ON
0 0 OFF
1 X OFF

XeDon’t care

TL/F/7561– 2

Order Number DS55493J, DS75493J

or DS75493N

See NS Package Number J16A or N16A

C

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

TL/F/7561

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 10V

Input Voltage 10V

Output Voltage V

Storage Temperature Range

Output Current (I

OUT

)

b

65§Ctoa150§C

b

CC

25 mA

Operating Conditions

Supply Voltage

V

CC

V

SS

Temperature T

DS75493 0

A

DS55493

Min Max Units

3.2 8.8 V

6.5 8.8 V

b

55

a

70

a

125

C

§

C

§

Maximum Power Dissipation* at 25§C

Cavity Package 1371 mW
Molded Package 1280 mW

Lead Temperature (Soldering, 4 seconds) 260

*Derate cavity package 9.14 mW/§C above 25§C; derate molded package

C above 25§C.

10.24 mW/

§

Electrical Characteristics (V

t

SS

C

§

VCC) (Notes 2 and 3)

Symbol Parameter Conditions Min Typ Max Units

I

IN

I

CE

I

OUT

I

OL

I

CC

I

SS

Input Current V

Chip Enable Input Current V

Output Current I

Output Leakage Current I

Supply Current, V

CC

Supply Current V

e

SS

e

I

OUT

e

CC

to GND

@

OUT

e

OUT

Measure Current to Gnd, V

e

V

SS

e

V

CC

e

CC

e

V

CC

e

Max, V

R

SET

Max, V

2.15V, R

R

SET

8.8V, V

IN

@

0V, V

e

Max, V

SS

e

L

@

0V, V

8.8V 100 kX

Max, V

e

Max, All Other Pins to Gnd 40 mA

SS

e

Open, V

CC

e

8.8V 3.6 mA

CE

e

8.8V, All Other Pins

CE

50X V

e

CC

e

I

CE

Through 1.0 kX

e

V

CE

e

CC

e

IN

e

V

CE

1.0 kX,V

e

CE

e

Min, V

SS

80 mA, V

IN

e

0V, V

IN

e

Min, V

CE

8.8V Through

6.5V Though

e

8.8V

IN

0V 3.2 mA

6.5V,

e

8.8V

6.5V

b8b

b16b

13 mA

0V

2.1 mA

20 mA

b

200 mA

b

100 mA

0V, All Other Pins to Gnd 40 mA

Min, V

SS

e

8.8V I

@

2.15V, V

OUT

Through 100 kX, 0.5 1.5 mA

e

R

50X

L

e

I

Open, R

OUT

e

V

0V

CE

CE

SET

e

8.8V

e

Open,

1.4 mA

Switching Characteristics T

e

25§C, nominal power supplies unless otherwise noted

A

Symbol Parameter Conditions Min Typ Max Units

t

pd(OFF)

t

pd(ON)

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 devices
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
DS55493.

Note 3: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown
as max or min on absolute value basis.

Propagation Delay to a Logical ‘‘0’’ (See AC Test Circuit
From Input to Output

Propagation Delay to a Logical ‘‘1’’ (See AC Test Circuit)
From Input to Output

Ctoa70§C range for the DS75493 and across theb55§Ctoa125§C range for the

§

170 300 ns

11 100 ns

2

Typical Applications

TL/F/7561– 3

AC Test Circuit

TL/F/7561– 4

Physical Dimensions inches (millimeters)

Switching Time Waveforms

TL/F/7561– 5

Order Number DS55493J, DS75493J

NS Package Number J16A

3

Physical Dimensions inches (millimeters) (Continued)

Order Number DS75493N

See NS Package Number N16A

DS55493/DS75493 Quad LED Segment Driver

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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or 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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