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DM74LS90

National
Part Number DM74LS90
Manufacturer National
Description Decade and Binary Counters
Published Aug 18, 2005
Detailed Description DM74LS90 Decade and Binary Counters August 1986 Revised March 2000 DM74LS90 Decade and Binary Counters General Descrip...
Datasheet PDF File DM74LS90 PDF File

DM74LS90
DM74LS90


Overview
DM74LS90 Decade and Binary Counters August 1986 Revised March 2000 DM74LS90 Decade and Binary Counters General Description Each of these monolithic counters contains four masterslave flip-flops and additional gating to provide a divide-bytwo counter and a three-stage binary counter for which the count cycle length is divide-by-five for the DM74LS90.
All of these counters have a gated zero reset and the DM74LS90 also has gated set-to-nine inputs for use in BCD nine’s complement applications.
To use their maximum count length (decade or four bit binary), the B input is connected to the QA output.
The input count pulses are applied to input A and the outputs are as described in the appropriat...



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