General Description
The MM74C192 and MM74C193 up/down counters are monolithic complementary MOS (CMOS) integrated circuits. The MM74C192 is a BCD counter, while the MM74C193 is a binary counter.
Counting up and counting down is performed by two count inputs, one being held high while the other is clocked. The outputs change on the positive-going transition of this clock.

FEATUREs
■ High noise margin: 1V guaranteed
■ Tenth power TTL compatible: Drive 2 LPTTL loads
■ Wide supply range: 3V to 15V
■ Carry and borrow outputs for N-bit cascading
■ Asynchronous clear
■ High noise immunity: 0.45 VCC (typ.)