74HC390 counter equivalent, dual decade ripple counter.
* Input levels:
* For 74HC390: CMOS level
* For 74HCT390: TTL level
* Two BCD decade or bi-quinary counters
* One device can be configured to divide-b.
of divide-by-2, 4, 5, 10, 20, 25, 50 or 100. Each section is triggered by the HIGH-to-LOW transition of the clock inputs.
The 74HC390; 74HCT390 is a dual 4-bit decade ripple counter divided into four separately clocked sections. The counters have two divide-by-2 sections and two divide-by-5 sections. These sections share an asynchronous master reset input (nMR) and can .
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