74ACTQ646 From datasheet system
74ACTQ646ASPC Single 8-bit Bus Transceiver
74ACTQ646CW Quiet Series Octal Transceiver/Register with 3-STATE Outputs
74ACTQ646SC Quiet Series? Octal Transceiver/Register with 3-STATE Outputs
74ACTQ646SCQR Single 8-bit Bus Transceiver
74ACTQ646SCX Single 8-bit Bus Transceiver
74ACTQ646SPC Single 8-bit Bus Transceiver
74ACTQ646SPCQR Single 8-bit Bus Transceiver