Revision 5 datasheet for the SN74LS569A, a synchronous 4-bit up/down binary counter with 3-state outputs from the 74LS low-power Schottky TTL line, in a 108 KB PDF. It gives the pinout, function table for load, count and output enable, timing waveforms and electrical characteristics. On vintage digital boards the sheet helps verify counter operation with a scope and identify which pins drive the bus. Check the exact part including the A suffix against the chip, as closely related counters differ in outputs and clear behaviour.
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