74LVT16646ADG-T 3.3 V 16-bit bus transceiver; 3-state - Description: 3.3V 16-Bit Transceiver/Register with Bus Hold (3-State) ; Fmax: 150 MHz; Logic switching levels: TTL ; Number of pins: 56 ; Output drive capability: -32/+64 mA ; Propagation delay: 1.9@3.3V ns; Voltage: 2.7-3.6 V
74LVT16500ADL-T 3.3 V 18-bit universal bus transceiver; 3-state - Description: 3.3V 18-Bit Universal Bus Transceiver; Negative Edge Trigger Clock with Bus Hold (3-State) ; Fmax: 350 MHz; Logic switching levels: TTL ; Number of pins: 56 ; Output drive capability: -32/+64 mA ; Propagation delay: 1.9@3.3V ns; Voltage: 2.7-3.6 V