HEF4518B counter equivalent, dual bcd counter.
for the HEF4518B are:
* Multistage synchronous counting.
* Multistage asynchronous counting.
* Frequency div.
T he HEF4518B is a dual 4-bit internally synchronous BCD counter. The counter has an active HIGH clock input (CP0) and an active LOW clock input (CP1), buffered outputs from all four bit positions (O0 to O3) and an active HIGH overriding asynchronous.
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