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7490

National Semiconductor
Part Number 7490
Manufacturer National Semiconductor
Description Decade and Binary Counter
Published Aug 24, 2019
Detailed Description DM5490 DM7490A DM7493A Decade and Binary Counters www.DataSheet4U.com July 1992 DM5490 DM7490A DM7493A Decade and Bin...
Datasheet PDF File 7490 PDF File

7490
7490

Overview
DM5490 DM7490A DM7493A Decade and Binary Counters www.
DataSheet4U.
com July 1992 DM5490 DM7490A DM7493A 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 90A and divideby-eight for the 93A All of these counters have a gated zero reset and the 90A 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 appropriate truth table A symmetrical divide-by-ten count can be obtained from the 90A counters by connecting the QD output to the A input and applying the input count to the B input which gives a divide-by-ten square wave at output QA Features Y Typical power di...


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