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7446A

Fairchild Semiconductor
Part Number 7446A
Manufacturer Fairchild Semiconductor
Description BCD to 7-Segment Decoders/Drivers
Published Oct 28, 2005
Detailed Description DM7446A, DM7447A BCD to 7-Segment Decoders/Drivers September 1986 Revised July 2001 DM7446A, DM7447A BCD to 7-Segment ...
Datasheet PDF File 7446A PDF File

7446A
7446A

Overview
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 Outputs Note Function LT RBI D C B A (Note 1) a b c d e f g 0 HHL L L L H L L L L L LH 1 HXL L LH H HL LHHHH 2 HXL LHL H L LHL LHL 3 HX L LHH H L L L LHHL 4 HXLHL L H HL LHH L L 5 HX L H L H H LHLLHLL 6 HX LHHL H HH L L L L L 7 HX LHHH H L L L H H H H (Note 2) 8 HXHL L L H LLLLLLL 9 HXHL LH H L L LHH L L 10 HXHLHL H HHHL LHL 11 HXH L HH H HH L LHHL 12 HXHH L L H HLHHH L L 13 HXHH LH H LHHLHL L 14 HX HHH L H HHHL L L L 15 HXHHHH H HHHH...


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