SNJ54LS669J Texas Instruments - Yeehing Electronics

Synchronous 4-Bit Up/Down Counters

Pricing (USD)

The above prices are for reference only.

Specifications

For more information, please refer to datasheet

Documents

More Information

These synchronous presettable counters feature an internal carry look-ahead for cascading in high-speed counting applications. The 'LS668 are decade counters and the 'LS669 are 4-bit binary counters. 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.