These octal bus transceivers are designed for asynchronous two-way communication between data busses. These devices transmit data from the A bus to the B bus or from the B bus to the A bus depending upon the level at the direction control (DIR) input. The enable input (G) can be used to disable the device so the busses are effectively isolated.

Features:
Advanced Oxide-isolated Ion-implanted Schottky TTL process
Switching performance is guaranteed over full temperatureand VCC supply range
Switching performance specified at 50 pF
PNP input design reduces input loading

20 pin DIP. Actual brand may vary from picture.
G4701A