DM74LS169AN

同步4位加/减二进制计数器 Synchronous 4-Bit Up/Down Binary Counter

General Description

This synchronous presettable counter 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 all change at the same time 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 edge of the clock waveform.

Features

Fully synchronous operation for counting and programming.

Internal look-ahead for fast counting.

Carry output for n-bit cascading.

Fully independent clock circuit