DM74LS47

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

Outputs

General Description

The ’LS47 accepts four lines of BCD (8421) input data, gen-

erates 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 with-

stand 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

n

Open-collector outputs

n

Drive indicator segments directly

n

Cascadable zero-suppression capability

n

Lamp test input

Connection Diagram

Pin Names

Description

A0–A3

BCD Inputs

RBI

Ripple Blanking Input (Active LOW)

LT

Lamp Test Input (Active LOW)

BI/RBO

Blanking Input (Active LOW) or

Ripple Blanking Output (Active LOW)

a–g

Dual-In-Line Package

DS009817-1

Order Number DM54LS47J, DM54LS47W,

DM74LS47M or DM74LS47N

See Package Number J16A, M16A, N16E or W16A

March 1998

© 1998 Fairchild Semiconductor Corporation

DS009817

www.fairchildsemi.com