7492 IC Binary Counters

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 ’90A and ‘LS90, divide-by-six for the ’92A and ‘LS92, and
the divide-by-eight for the ’93A and ‘LS93.
All of these counters have a gated zero reset and the ’90A and ‘LS90 also have gated set-to-nine
inputs for use in BCD nine’s complement applications.
To use their maximum count length (decade, divide-by-twelve, or four-bit binary) of
these counters, the CKB input is connected to the 0A output. The input count pulses are
applied to CKA input and the outputs are as described in the appropriate function table. A
symmetrical divide-by-ten count can be obtained from the ’90A or ‘LS90 counters by
connecting the Oo output to the CKA input and applying the input count to the CKB input which
gives a divide-by­ ten square wave at output 0A,