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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.
HD74HC4518 Datasheet
