Datasheet revision 5 for the SN74LS669, a synchronous 4-bit up/down binary counter from the 74LS low-power Schottky TTL family, as a 74.2 KB PDF. It includes the pinout, count and load function table, timing diagrams and electrical limits. Technicians refer to it when tracing clock and counter chains in older digital equipment, checking whether carry and load lines behave correctly with a scope or logic analyzer. Confirm the exact part, including the LS suffix, on the chip itself, since related counters share similar pinouts.
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