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The SN74LS90N, SN74HC90N, SN7490 Are Decade and Binary Counters General Description Each of these monolithic counters contains four master-slave flip-flops and additional gating to provide a divide-by-two counter and a three-stage binary counter for which the count cycle length is divide-by-five for the’LS90 and divide-by-eight for the LS93.
The SN74LS90N, SN74HC90N, SN7490 Are Decade and Binary Counters
General Description
Each of these monolithic counters contains four
master-slave flip-flops and additional gating to provide a
divide-by-two counter and a three-stage binary counter for
which the count cycle length is divide-by-five for the’LS90
and divide-by-eight for the LS93.
All of these counters have a gated zero reset and the LS90
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 ’LS90 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 Datasheet: PDF Features: Packing List: 1Pc * SN74LS90N Decade Counter Logic IC