HD74HC4518, HD74HC4520 Dual BCD Up Counters Dual Binary Up Counters REJ03D0653–0200 (Previous ADE-205-542) Rev.
2.
00 Mar 30, 2006 Description The HD74HC4518 dual BCD counter and the HD74HC4520 dual binary counter consist of two identical, independent, internally synchronous 4-stage counters.
The counter stages are type D flip-flops, with interchangeable Clock and Enable lines for incrementing on either the positive-going or negative-going transition as required when cascading multiple stages.
Each counter can be cleared by applying a high level on the Reset line.
In addition, the HD74HC4518 will count out of all undefined states within two clock periods.
These complementary MOS up counters...

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