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The ’ACT163 devices are 4-bit binary counters. These synchronous, presettable counters feature an internal carry look-ahead for applicaTIon in high-speed counTIng designs. Synchronous operaTIon is provided by having all flip-flops clocked simultaneously so that the outputs change, coincident with each other, when instructed by the count-enable (ENP, ENT) inputs and internal gaTIng. This mode of operation eliminates the output counting spikes normally associated with synchronous (ripple-clock) counters. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge of the clock waveform.
The counters are fully programmable; that is, they can be preset to any number between 0 and 9 or 15.
