Synchronous 4-bit Up/down Counters With Mode Control - National Semiconductor

These circuits are synchronous, reversible, up/down coun- ters DM54LS190 DM74LS190 DM54LS191 DM74LS191 . The LS191 is a 4-bit binary Counter and the LS190 is a BCD Counter Synchronous operation is provided by having all Flip-Flops clocked simultaneously, so that the outputs change simultaneously when so 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 master-slave Flip-Flops are triggered on a low-to-high level transition of the Clock input, if the enable input is low. A high at the enable input inhibits count- ing. Level changes at either the enable input or the down/ up input should be made only when the Clock input is high. The direction of the count is determined by the level of the down/up input. When low, the Counter counts up and when high, it counts down. These Counters are fully programmable; that is, the outputs may be preset to either level by placing a low on the load input and entering the desired data at the data inputs. The output will change independent of the level of the Clock in- put. This feature allows the Counters to be used as modulo- N dividers by simply modifying the count length with the preset inputs. By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
DM54LS190W/883 Rochester Electronics LLC Decade Counter, LS Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, TTL, CDFP16, W16A
DM54LS190 's PackagesDM54LS190 's pdf datasheet

DM54LS190 Pinout, Pinouts
DM54LS190 pinout,Pin out
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