SN54LS90 counter equivalent, 4-bit binary counter.
14 21
10 16 14 21
ns
tPLH tPHL
tPLH tPHL
tPLH
tPHL
tPHL
CP1 Input to Q2 Output
CP1 Input to Q3 Output MS Input to Q0 and Q3 Outputs MS Input to Q1 a.
The LS90, LS92, and LS93 are 4-bit ripple type Decade, Divide-By-Twelve, and Binary Counters respectively. Each device consists of four master/slave flip-flops which are internally connected to provide a divide-by-two section and a divide-by-five (LS.
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