UT54ACTS190

Standard Products UT54ACS190/UT54ACTS190 Synchronous 4-Bit Up-Down BCD Counters Datasheet November 2010 www.aeroflex.com/logic FEATURES ‰ Single down/up count control line ‰ Look-ahead circuitry enhances speed of cascaded counters ‰ Fully synchronous in count modes ‰ Asynchronously presettable with load control ‰ 1.2μ CMOS - Latchup immune ‰ High speed ‰ Low power consumption ‰ Single 5 volt supply ‰ Available QML Q or V processes ‰ Flexible package - 16-pin DIP - 16-lead flatpack ‰ UT54ACS190 - SMD 5962-96562 ‰ UT54ACTS190 - SMD 5962-96563 DESCRIPTION The UT54ACS190 and the UT54ACTS190 are synchronous 4bit reversible up-down BCD decade 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....