M54/74HC245/640/643 M54/74HC245/640/643 OCTAL BUS .
ST Microelectronics
M74HC640 - OCTAL BUS TRANSCEIVER
M54/74HC245/640/643 M54/74HC245/640/643 OCTAL BUS TRANSCEIVER (3-STATE): HC245 NON INVERTING HC640 INVERTING, HC643 INVERTING/NON INVERTING . . . . ..