BUY 74LS645-1N https://www.utsource.net/itm/p/1734056.html
OCTAL BUS TRANSCEIVERS
Description: The 74LS645-1N is a 8-bit bidirectional bus transceiver with 3-state outputs. It is a high-speed, low-power device designed for bus-oriented applications. Features: 8-bit bidirectional bus transceiver 3-state outputs High-speed operation Low-power consumption TTL-compatible inputs Outputs source/sink 24mA Applications: Data transmission Data buffering Data latching Bus-oriented applications (For reference only)