These octal bus transceivers are designed for asynchronous two-way
communication between data buses. These devices transmit data from
the A bus to the B bus or from the B bus to the A bus, depending on
the level at the direction-control (DIR) input. The output-enable
input can be
used to disable the device so that the buses are effectively
The -1 version of the SN74ALS645A is identical to the standard
version, except that the recommended maximum IOL is
increased to 48 mA. There is no -1 version of the SN54ALS645A.
The SN54ALS645A and SN54AS645 are characterized for operation over
the full military temperature range of -55°C to 125°C. The
SN74ALS645A and SN74AS645 are characterized for operation from
0°C to 70°C.
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