Revision 1 datasheet for the SN74LS541, an octal buffer and line driver with non-inverting 3-state outputs from the 74LS low-power Schottky TTL family, 63.9 KB PDF. It shows the flow-through pinout, the two active-low output enables, drive current limits and propagation delays. Repair technicians consult it when a data or address bus on vintage hardware shows stuck levels, to see which side of the buffer is at fault. Remember the inverting SN74LS540 shares the layout, so check the marking before replacing.
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