© 2000 Fairchild Semiconductor Corporation

DS009817

www.fairchildsemi.com

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 maxi-

mum leakage current of 250

µA. Auxiliary inputs provided

blanking, lamp test and cascadable zero-suppression func-

tions.

Features

s Open-collector outputs

s Drive indicator segments directly

s Cascadable zero-suppression capability

s Lamp test input

Ordering Code:

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

Logic Symbol

GND

= Pin 8

Connection Diagram

Pin Descriptions

Note 1: OC—Open Collector

Order Number

Package Number

Package Description

DM74LS47M

M16A

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

DM74LS47N

N16E

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

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

Segment Outputs (Active LOW) (Note 1)