SNJ54LS697J Texas Instruments - Yeehing Electronics

Synchronous Up/Down Counters With Output Registers And Multiplexed 3-State Outpu

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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.