Revision 5 datasheet for the SN74LS540, an octal buffer and line driver with inverting 3-state outputs from the 74LS low-power Schottky TTL range, as a 75.1 KB PDF. It contains the pin diagram, function table for the two output enables, input and output levels, and switching times. When a bus on an older computer or controller misbehaves, this sheet helps determine which buffer pins should toggle. Confirm the chip is the inverting 540 and not the 541 before using it as a reference or replacement.
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