Counter Single 4-Bit Sync Binary UP/Down 16-Pin PDIP Tube

This synchronous, presettable, 4-bit up/down binary counter features an internal carry look-ahead circuitry for cascading in high-speed counting applications. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable (ENP\, ENT\inputs and internal gating. This mode of operation eliminates the output counting spikes that are normally associated with asynchronous (ripple-clock) counters. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge of the clock waveform.This counter is fully programmable; that is, it may be preset to any number between 0 and its maximum count. The load-input circuitry allows loading with the carry-enable output of cascaded counters. As loading is synchronous, setting up a low level at the load (LOAD\) input disables the counter and causes the outputs to agree with the data inputs after the next clock pulse.

Fully Synchronous Operation for Counting and Programming

Internal Look-Ahead Circuitry for Fast Counting

Carry Output for N-Bit Cascading

Fully Independent Clock Circuit

Package Options Include Plastic Small-Outline Packages andStandard Plastic 300-mil DIPs