The SN74LVC4245ADWR is a 8-bit (octal) Non-inverting Bus Transceiver contains two separate supply rails, B port has VCCB, which is set at 3.3V and A port has VCCA, which is set at 5V. This allows for translation from a 3.3 to a 5V environment and vice versa. The SN74LVC4245ADWR device is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. The control circuitry (DIR, OE) is powered by VCCA. The SN74LVC4245ADWR device terminal out allows the designer to switch to a normal all-3.3V or all-5V 20-terminal SN74LVC4245ADWR device without board re-layout. The designer uses the data paths for pins 2-11 and 14-23 of the SN74LVC4245ADWR device to align with the conventional "245 terminal out.
The SN74LVC4245APWR is a non-inverting Octal Bus Transceiver and 3.3 to 5V Shifter with 3-state outputs. The SN74LVC4245A device is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B-bus or from the B-bus to the A-bus, depending on the logic level at the direction-control (DIR) input. The output-enable input can be used to disable the device so the buses are effectively isolated. The control circuitry is powered by VCCA. The SN74LVC4245A device terminal out allows the designer to switch to a normal all 3.3 or all 5V 20-terminal SN74LVC4245 device without board re-layout. The designer uses the data paths for pins 2-11 and 14-23 of the SN74LVC4245A device to align with the conventional 245 terminal out.
The 74LVX4245MTCX is a 8-bit dual supply Translating Transceiver with 3-state outputs. It is designed to interface between a 5V bus and a 3V bus in a mixed 3V/5V supply environment. The transmit/receive (T/R) input determines the direction of data flow. Transmit (active-high) enables data from A ports to B ports, receive (active-low) enables data from B Ports to A Ports. The OE input, when high, disables both A and B Ports by placing them in a high impedance condition. The A port interfaces with the 5V bus, the B port interfaces with the 3V bus.