SN74ALS243AN

LOGIC, BUS TRANSCVR TRI-ST QD, 14DIP.

The SN74ALS243AN is a Quadruple Bus Transceiver with 3-state outputs. It is designed for asynchronous two-way communication between data buses. The control-function implementation allows for maximum flexibility in timing. This device allows data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic levels at the output-enable inputs. The output-enable inputs can be used to disable the device so that the buses are effectively isolated. The dual-enable configuration gives the quadruple bus transceivers the capability to store data by simultaneously enabling output-enable. Each output reinforces its input in this transceiver configuration. When both control inputs are enabled and all other data sources to the two sets of bus lines are at high impedance, both sets of bus lines retain their states. The 4-bit codes appearing on the two sets of buses are identical. The SN74ALS243A is characterized for operation from 0 to 70°C.