General Description

The DM7446A and DM7447A feature active-LOW outputs designed for driving common-anode LEDs or incandescent indicators directly. All of the circuits have full ripple-blanking input/output controls and a lamp test input. Segment identification and resultant displays are shown on a following page. Display patterns for BCD input counts above nine are unique symbols to authenticate input conditions.

Features

■ All circuit types feature lamp intensity modulation capability

■ Open-collector outputs drive indicators directly

■ Lamp-test provision

■ Leading/trailing zero suppression