18-bit universal bus transceiver; 3-state - Description: 2.5/3.3V 18-Bit Universal Bus Transceiver; Positive Edge-Trigger Clock with Bus Hold (3-State) ; Logic switching levels: TTL ; Number of pins: 56 ; Output drive capability: -32/+64 mA ; Propagation delay: [email protected] ns; Voltage: 2.3-3.6 V