13 These octal bus Transceivers
are designed for 9 12 asynchronous two-way Communication
between 10 11 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 (OE) input can be used to disable the device so that the buses are effectively isolated. The SN74ALS1640A
features inverting logic, while the SN74ALS1645A
features noninverting logic.