TLF6518

June 1989

DM7446A DM5447ADM7447A

BCD to 7-Segment DecodersDrivers

General Description

The 46A and 47A feature active-low outputs designed for

driving common-anode LEDs or incandescent indicators di-

rectly All of the circuits have full ripple-blanking inputout-

put controls and a lamp test input Segment identification

and resultant displays are shown on a following page Dis-

play patterns for BCD input counts above nine are unique

symbols to authenticate input conditions

All of the circuits incorporate automatic leading andor trail-

ing-edge zero-blanking control (RBI and RBO) Lamp test

(LT) of these devices may be performed at any time when

the BIRBO node is at a high logic level All types contain

an overriding blanking input (BI) which can be used to con-

trol the lamp intensity (by pulsing) or to inhibit the outputs

Features

Y

All circuit types feature lamp intensity modulation

capability

Y

Open-collector outputs drive indicators directly

Y

Lamp-test provision

Y

Leadingtrailing zero suppression

Connection Diagram

Dual-In-Line Package

TLF6518 – 1

Order Number DM5447AJ DM7446AN or DM7447AN

See NS Package Number J16A or N16E

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A