Revision 5 datasheet for the SN74LS623, an octal bus transceiver with 3-state outputs in the 74LS low-power Schottky TTL family, provided as a 50.4 KB PDF. The document lists pinout, the dual enable function table for each transfer direction, input and output levels and timing limits. Use it while diagnosing data bus faults on older digital boards, for example to confirm which enable pin should be active during a read or write cycle. Match the full part number on the package before using another transceiver as a substitute.
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