UT54ACS193

Standard Products UT54ACS193/UT54ACTS193 Synchronous 4-Bit Up-Down Dual Clock Counters Datasheet November 2010 www.aeroflex.com/logic FEATURES ‰ Look-ahead circuitry enhances cascaded counters ‰ Fully synchronous in count modes ‰ Parallel asynchronous load for modulo-N count lengths ‰ Asynchronous clear ‰ 1.2μ CMOS (ACTS193) and .6μm CRH CMOS process (ACS193) - 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 ‰ UT54ACS193 - SMD 5962-96566 ‰ UT54ACTS193 - SMD 5962-96567 DESCRIPTION The UT54ACS193 and the UT54ACTS193 are synchronous 4bit, binary reversible up-down binary counters. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when instructed. Synchronous operation eliminates the output counting spikes normally associated with asynchronous counters. The outputs of the four flip-flops are triggered on a low-to-highlevel transition of either count input (Up or Down). The direction of the counting is determined by which count input is pulsed while the other count input is high. The counters are fully programmable. 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 to agree with the data inputs independently of the count pulses. Asynchronous loading allows the counters to be used as modul...