These octal bus transceivers are designed for asynchronous two-way
communication between open-collector and 3-state buses. The devices
transmit data from the A bus (open-collector) to the B bus (3 state)
or from the B bus to the A bus, depending on the logic level at the
direction-control (DIR) input. The output-enable () input can be used to disable the
device so the buses are isolated.
The -1 version of SN74ALS638A is identical to the standard
version, except that the recommended maximum IOL is
increased to 48 mA.
The SN74ALS638A, SN74ALS639A, SN74AS638A, and SN74AS639 are
characterized for operation from 0°C to 70°C.
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