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Internal Look-Ahead for Fast Counting

Carry Output for n-Bit Cascading

Synchronous Counting

Synchronously Programmable

Load Control Line

Diode-Clamped Inputs

description

These synchronous, presettable counters feature an in

ternal carry look-ahead for application in high-speed

counting designs. The '160,162,LS160A, LS1624,

and $162 are decade counters and the

161,163, LS161A,(S163A, and ‘S163 are 4-bit

binary counters. Synchronaus aperation is provided by

having all flip-flops clocked simultaneously so that the.

outputs change coincident with each other when so in-

structed by the count-enable inputs and internal gating.

“This mode of operation eliminates the output counting

spikes that are normaly associated with asynchronous

ripple clock) counters, however counting spikes may

occur on the (RCO) ripple carry output. A buffered clock

input wriggegs the four fp flops on the rising edge of the

clock input waveform.