74HC191 Presettable synchronous 4-bit binary up/down counter
74HC191D Presettable synchronous 4-bit binary up/down counter
74HC191D-T Synchronous Up/Down Counter
74HC191DB Presettable synchronous 4-bit binary up/down counter
74HC191N Presettable synchronous 4-bit binary up/down counter
74HC191PW Presettable synchronous 4-bit binary up/down counter
74HC191U Presettable synchronous 4-bit binary up/down counter