The HC191 are 4-bit synchronous, reversible, up/down binary Counters SN54HC191 SN74HC191 . Synchronous counting operation is provided by having all Flip-Flops clocked simultaneously so that the outputs change coincident with each other when instructed by the steering Logic This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple- clock) Counters The outputs of the four Flip-Flops are triggered on a low-to-high-level transition of the Clock (CLK) input if the count-enable (CTEN) input is low. A high at CTEN inhibits counting. The direction 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. These Counters feature a fully independent Clock circuit. Change at the control (CTEN and D/U) inputs that modifies the operating mode have no effect on the contents of the Counter until clocking occurs. The function of the Counter is dictated solely by the condition meeting the stable setup and hold times. These Counters are fully programmable; that is, each of the outputs CAN be preset to either level by placing a low on the load (LOAD) input and entering the desired data at the data inputs. The output changes to agree with the data inputs independently of the level of CLK. This feature allows the Counters to be used as modulo-N dividers by simply modifying the count length with the preset inputs. By Texas Instruments
Part Manufacturer Description Datasheet Samples
SN54HC191TDE2 Texas Instruments 4-Bit Synchronous Up/Down Binary Counter 0- 25 Only
SN54HC191J Texas Instruments Synchronous 4-Bit Up/Down Binary Counters 16-CDIP -55 to 125
SN54HC191TDE1 Texas Instruments 4-Bit Synchronous Up/Down Binary Counter 0- 25 Only
SN54HC191 's PackagesSN54HC191 's pdf datasheet

SN54HC191 Pinout, Pinouts
SN54HC191 pinout,Pin out
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