描述 Description

General Description
These synchronous, presettable counters feature an inter nal carry look-ahead for application in high-speed counting designs. The 161 and 163 are 4-bit binary counters. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change co incident with each other when so instructed by the countenable inputs and internal gating. This mode of operation eliminates the output counting spikes which 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 waveform.

特性 Features

Synchronously programmable
Internal look-ahead for fast counting
Carry output for n-bit cascading
Synchronous counting
Load control line
Diode-clamped inputs
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