IN74LS161D中文资料INTEGRAL数据手册PDF规格书

Synchronous 4 Bit Counters; Binary, Direct Reset

This synchronous, presettable counter features 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 conicident with each other when so instructed by the count-enable 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 input triggers the four flip-flops on the rising (positive-going) edge of the clock input wave form.

• Internal Look-Ahead for Fast Counting

• Carry Output for n-Bit Cascading

• Synchronous Counting

• Synchronously Programmable

• Load Control Line

• Diode-Clamped Inputs