DM7447A

Features:

 All circuit types feature lamp intensity modulation capability
 Open-collector outputs drive indicators directly
 Lamp-test provision
 Leading/trailing zero suppression


Specifications

Supply Voltage                                                               7V
Input Voltage                                                              5.5V
Operating Free Air Temperature Range        0°C to +70°C
Storage Temperature Range                   -65°C to +150°C


Description

 The DM7446A and DM7447A feature active-LOW outputs designed for driving common-anode LEDs or incandescent indicators directly. All of the DM7446A and DM7447A 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.

  All of the DM7446A and DM7447A circuits incorporate automatic leading and/or trailing-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 control the lamp intensity (by pulsing) or to inhibit the outputs.