Datasheet of 7447 Ic

DM74LS47 BCD to 7-Segment Decoder/Driver with Open-Collector Outputs

October 1988 Revised March 2000

DM74LS47 BCD to 7-Segment Decoder/Driver with Open-Collector Outputs
General Description
The DM74LS47 accepts four lines of BCD (8421) input data, generates their complements internally and decodes the data with seven AND/OR gates having open-collector outputs to drive indicator segments directly. Each segment output is guaranteed to sink 24 mA in the ON (LOW) state and withstand 15V in the OFF (HIGH) state with a maximum leakage current of 250 µA. Auxiliary inputs provided blanking, lamp test and cascadable zero-suppression functions.

Features s Open-collector outputs s Drive indicator segments directly s Cascadable zero-suppression capability s Lamp test input

Ordering Code:
Order Number DM74LS47M DM74LS47N Package Number M16A N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Symbol

Connection Diagram

VCC = Pin 16 GND = Pin 8

Pin Descriptions
Pin Names A0–A3 RBI LT BI/RBO a –g BCD Inputs Ripple Blanking Input (Active LOW) Lamp Test Input (Active LOW) Blanking Input (Active LOW) or Ripple Blanking Output (Active LOW) Segment Outputs (Active LOW) (Note 1)
Note 1: OC—Open Collector

Description

© 2000 Fairchild Semiconductor Corporation

DS009817

www.fairchildsemi.com

DM74LS47

Truth Table
Decimal or Function 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 BI RBI LT LT H H H H H H H H H H H H H H H H X H L RBI H X X X X X X X X X X X X X X X X L X A3 L L L L L L L L H H H H H H H H X L X Inputs A2 L L L L H H H H L L L L H H H H X L X A1 L L H H L L H H L L H H L L H H X L X A0 L H L H L H L H L H L H L H L H X L X BI/RBO H H H H H H H H H H H H H H H H L L H a L H L L H L H L L L H H H L H H H H L