74192: Decade (÷10) Up/Down Counter (Carry, Borrow, Presettable, Synchronous)

This is a synchronous decade (base-10) counter that counts in either direction, Two input clocks are used, and stages are Carry/Borrow cascaded.

For a normal up-counting sequence, Load should be high, and Clear should be low.

The counter advances one count on each ground-to-positive transition of the Up-Count input clock. It backs up one count on each ground-to-positive transition of the Down-Count input clock. When up-counting, hold the Down-Count input high. When down-counting, hold the Up-Count input high,

To load, the desired word is placed on Load inputs L1, L2, L4, and L8. The Load input is then briefly brought low. To clear the counter, the Clear input is briefly made positive. Note that the Clear must be low for normal counting.

Stages are cascaded by connecting Carry to Up Count and Borrow to Down Count. For more details, consult data sheet.

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