BCD to 7-Segment Decoders/Drivers
DM7446A, DM7447A BCD to 7-Segment Decoders/Drivers
September 1986 Revised July 2001
DM7446A, DM7447A BCD to 7-Segment ...
Description
DM7446A, DM7447A BCD to 7-Segment Decoders/Drivers
September 1986 Revised July 2001
DM7446A, DM7447A BCD to 7-Segment Decoders/Drivers
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.
All of the 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.
Features
s All circuit types feature lamp intensity modulation capability
s Open-collector outputs drive indicators directly s Lamp-test provision s Leading/trailing zero suppression
Ordering Code:
Order Number DM7446AN DM7447AN
Package Number
Package Description
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Connection Diagram
© 2001 Fairchild Semiconductor Corporation DS006518
www.fairchildsemi.com
DM7446A, DM7447A
Function Table
Decimal or
Inputs
BI/RBO
Outp...
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