HD74LS669P

Product Summary

The HD74LS669P is a Synchronous Up/Down 4-bit Binary Counter. The HD74LS669P features an internal carry look-ahead 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 inputs and internal gating. This mode of operation helps eliminate the output counting spikes that are normally associated with asynchronous (ripple-clock) counters. A buffered clock input triggers the four master-slave flip-flops on the rising (positive-going) edge of the clock waveform. The HD74LS669P is fully programmable; that is, the outputs may each be preset to either level. 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 input disables the counter and causes the outputs to agree with the data inputs after the next clock pulse. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional gating. Instrumental in accomplishing this function are two count enable inputs and a carry output. Both count enable inputs (P and T) must be low to count. The direction of the count is determined by the level of the up / down input. When the input is high, the counter counts up; when low, it counts down. Input T is fed forward to enable the carry output. The carry output thus enabled will produce a low-level output pulse with a duration approximately equal to the high portion of the QA output when counting up and approximately equal to the low portion of the QA output when counting down. This low level overflow carry pulse can be used to enable successive cascaded stages.

Parametrics

HD74LS669P absolute maximum ratings: (1)Supply voltage VCC: 7V; (2)Input voltage VIN: 7V; (3)Power dissipation PT: 400mW; (4)Storage temperature Tstg: –65℃ to +150℃.

Features

HD74LS669P feature: (1) Ordering Information.

Diagrams