Texas Instruments (SN74HC191N) Binary Synchronous Up / Down Counter, 48 MHz

Binary Synchronous Up / Down Counter, 48 MHz, 2 V to 6 V, DIP-16Product OverviewThe SN74HC191N is a 4-bit synchronous Up/Down Binary Counter operation isprovided by having all flip-flops clocked simultaneously so that the outputschange coincident with each other when instructed by the steering logic. Thismode of operation eliminates the output counting spikes normally associated withasynchronous (ripple-clock) counters. The outputs of the four flip-flops aretriggered on a low- to high-level transition of the clock input if thecount-enable (CTEN) input is low. A high at CTEN\ inhibits counting. Thedirection of the count is determined by the level of the down/up (D/U) input.When D/U\ is low, the counter counts up and when D/U\ is high, it counts down.It features a fully independent clock circuit. Change at the control (CTEN\ andD/U) inputs that modifies the operating mode has no effect on the contents ofthe counter until clocking occurs. The function of the counter is dictatedsolely by the condition meeting the stable setup and hold times.Outputs can drive up to 10 LSTTL loads13ns Typical tpdLow input current of 1µA MaximumSingle down/up count-control lineLook-ahead circuitry enhances speed of cascaded countersFully synchronous in count modesAsynchronously presettable with load control80µA Maximum low power consumption±4mA Output drive at 5VProduct InformationLogic Family / Base Number: 74HC191Counter Type: Binary, Synchronous, Up / DownClock Frequency: 48MHzCount Maximum: 16Logic Case Style: DIPNo. of Pins: 16PinsSupply Voltage Min: 2VSupply Voltage Max: 6VLogic IC Family: 74HCLogic IC Base Number: 74191Operating Temperature Min: -40°COperating Temperature Max: 85°CProduct Range: -MSL: -