These low-power Schottky LSI devices incorporate synchronous up/down counters,
four-bit D-type registers, and quadruple two-line to one-line multiplexers
with three state outputs in a single 20-pin package. The up/down counters
are programmable from the data inputs and feature enable P\ and
enable T\ and a ripple-carry output for easy expansion. The register/counter
select input R/C\, selects the counter when low and the register
when high for the three-state outputs, QA, QB, QC, and QD. These outputs are rated at 12 and 24 milliamperes
(54LS/74LS) for good bus driving performance.
Both the counter CCK and register clock RCK are positive-edge triggered.
The counter clear CCLR\ is active low and is asynchronous on the
'LS696 and 'LS697, synchronous on the 'LS699. Loading of the counter is accomplished
when LOAD\ is taken low and a positive transition occurs on the
counter clock CCK.
Expansion is easily accomplished by connecting RCO\ of the first
stage to ENT\ of the second stage, etc. All ENP\ inputs
can be tied common and used as a master enable or disable control.
