DM7446A Datasheet, PDF (1/6 Pages) Fairchild Semiconductor – BCD to 7-Segment Decoders/Drivers

June 1989
DM7446A DM5447A DM7447A
BCD to 7-Segment Decoders Drivers
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 input out-
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 and or trail-
ing-edge zero-blanking control (RBI and RBO) Lamp test
(LT) of these devices may be performed at any time when
the BI RBO 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 _{Leading trailing zero suppression}
Connection Diagram
Dual-In-Line Package
TL F 6518 – 1
Order Number DM5447AJ DM7446AN or DM7447AN
See NS Package Number J16A or N16E
C1995 National Semiconductor Corporation TL F 6518
RRD-B30M105 Printed in U S A