OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER WITH 3-STATE OUTPUTS

DESCRIPTION

This 8-bit (octal) noninverting 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 3.3V to a 5V environment, and vice versa.

The U74LVC4245 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 U74LVC4245 device terminal out allows the designer to

switch to a normal all-3.3V or all-5V 20-terminal U74LVC4245

device without board relay out.

FEATURES

* Bidirectional voltage translator

* 5.5V on A port and 2.7V to 3.6V on B port

* Control inputs VIH/VIL levels are referenced to VCC voltage