U74AVC4T245

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

14 of 16

www.unisonic.com.tw

QW-R126-075.D

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APPLICATION INFORMATION

The U74AVC4T245 device can be used in level-translation applications for interfacing devices or systems

operating at different interface voltages with one another. The U74AVC4T245 device is ideal for use in applications

where a push-pull driver is connected to the data I/Os.

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TYPICAL APPLICATION CIRCUIT

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POWER SUPPLY RECOMMENDATIONS

The U74AVC4T245 device uses two separate configurable power-supply rails, VCCA and VCCB. VCCA accepts any

supply voltage from 1.2V to 3.6V and VCCB accepts any supply voltage from 1.2V to 3.6V. The A port and B port are

designed to track VCCA and VCCB respectively allowing for low-voltage bidirectional translation between any of the

1.2V, 1.5V, 1.8V, 2.5V and 3.3V voltage nodes.

The output-enable ( OE ) input circuit is designed so that it is supplied by VCCA and when the OE input is high, all

outputs are placed in the high-impedance state. To ensure the high-impedance state of the outputs during power up

or power down, the OE input pin must be tied to VCCA through a pullup resistor and must not be enabled until VCCA

and VCCB are fully ramped and stable. The minimum value of the pullup resistor to VCCA is determined by the

current-sinking capability of the driver.