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DS8973 9-Digit LED Driver
May 1986
DS8973 9-Digit LED Driver
General Description
The DS8973 is a 9-digit driver designed to operate from 3-cell battery supplies Each driver will sink 100 mA to less than 0 7V when driven by only 0 1 mA Each input is blocked by diodes so that the input can be driven below ground with virtually no current drain This is especially important in calculator systems employing a DC-to-DC converter on the negative side of the battery If the converter were on the positive side of the battery the converter would have to handle all of the display current as well as the MOS calculator chip current But if it is on the negative side it only has to handle the MOS current The DS8973 is designed for the more efficient operating mode
Features
Y Y Y Y
Nine complete digit drivers Built-in low battery indicator High current outputs 100 mA Straight through pin out for easy board layout
Equivalent Circuit Diagrams
Typical Driver Circuit Typical D P Out Circuit
TL F 5851 - 2
TL F 5851 - 1
Connection Diagram
Dual-In-Line Package
TL F 5851 - 3
Top View Order Number DS8973N See NS Package Number N22A
C1995 National Semiconductor Corporation TL F 5851 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 Input Voltage Output Voltage Storage Temperature Range 10V 10V 10V
b 65 C to a 150 C
Operating Conditions
Min Supply Voltage (VB) Supply Voltage (VCC1) Temperature (TA) 30 30 0 Max 55 95 a 70 Units V V C
Maximum Power Dissipation at 25 C Molded Package Lead Temperature (Soldering 4 seconds)
Derate molded package 13 39 mW C above 25 C
1673 mW 260 C
Electrical Characteristics
Symbol VIH IIH VIL IIL VBH VBL ICEX VOL ICC1 IB Parameter Logical ``1'' Input Voltage Logical ``1'' Input Current Logical ``0'' Input Voltage Logical ``0'' Input Current High Battery Threshold Low Battery Threshold Logical ``1'' Output Current Logical ``0'' Output Voltage Supply Current Pin 21 (High Battery Supply) VCC e Max VCC e Max VIH e 3 9V VCC e Max VCC e Max VIL e 0 5V VOT (Pin 1) e 1V IOT s b50 mA TA e 25 C VIH (Pin 2) e 3 9V VOT (Pin 1) e 2 1V IOT s b6 mA TA e 25 C VIH (Pin 2) e 3 9V VCC e Min VOH e 9 5V VIL e 0 5V VCC e Min IOL e 100 mA VIH e 3 9V VCC e Max One Input ``ON'' VCC e Max VB e Max DS8973 DS8973 36 32 50 07 6 12 Conditions Min 39 01 03 05 40 Typ Max Units V mA V mA V V mA V mA mA
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 C to a 70 C range All typicals are given for TA e 25 C 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
2
3
DS8973 9-Digit LED Driver
Physical Dimensions inches (millimeters)
Molded Dual-In-Line Package (N) Order Number DS8973N NS Package Number N22A
LIFE SUPPORT POLICY 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 systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user
National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018
2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness
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National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications

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