DS8973 Datasheet | National Semiconductor

Description The DS8973 is a 9-digit driver designed to operate from 3-cell battery supplies Each driver will sink 100 m A to less than 0 7V when driven by only 0 1 m A 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 Nine plete digit drivers Built-in low battery indicator High current outputs 100 m A 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 m W C above 25 C 1673 m W 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...