SN74ALS243A - Texas Instruments

SN74ALS243A Quadruple Bus Transceiver

These quadruple bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation allows for maximum flexibility in timing. These devices allow 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 (OEBA and OEAB) inputs. The.

Features

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 (eight in all) retain their states. The 4-bit codes appearing on the two sets of buses are identical. SN54ALS243A . . . J PACKAGE SN74ALS243A . . . D OR N PACKAGE (TOP VIEW) OEAB 1 NC 2 A1 3 A2 4 A3 5 A4 6 GND 7 14 VCC 13 OEBA 12 NC 11 B1 10 B2 9 B3 8 B4 SN54ALS243A . . . FK PACKAGE (TOP VIEW) NC OEAB NC VCC OEBA A1 3 2 1 20 19 4 18 NC NC 5 17 NC A2 6 16 B1 NC 7 15 NC A3 8 14 B2 9 10 11 12 13 A4 GND NC B4 .