UT54ACS191

UT54ACS191/UT54ACTS191 Radiation-Hardened Synchronous 4-Bit Up-Down Binary Counters FEATURES Single down/up count control line counters Fully synchronous in count modes Asynchronously presetable with load control www.DataSheet4U.com radiation-hardened CMOS High speed Low power consumption Single 5 volt supply Available QML Q or V processes Flexible package - 16-pin DIP - 16-lead flatpack DESCRIPTION The UT54ACS191 and the UT54ACTS191 are synchronous 4bit reversible up-down binary counters. Synchronous counting operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed. Synchronous operation eliminates the output counting spikes associated with asynchronous counters. The outputs of the four flip-flops are triggered on a low-to-highlevel transition of the clock input if the enable input (CTEN) is low. A logic one applied to 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. The counters feature a fully independent clock circuit. Changes at control inputs (CTEN and D/U) that will modify the operating mode have no effect on the contents of the counter until clocking occurs. The counters are fully programmable. The outputs may be preset to either logic level by placing a low on the load input and entering the desired data at the data inputs. The output will change to ...