 DESCRIPTION

The UTC U74AVC4T245 is an 4-bit dual supply transceiver that

enables bidirectional level translation. The A port is designed to track

VCCA. VCCA accepts any supply voltage from 1.2V to 3.6V. The B port

is designed to track VCCB. VCCB accepts any supply voltage from 1.2V

to 3.6V. The UTC U74AVC4T245 is optimized to operate with

VCCA/VCCB set at 1.4V to 3.6V. It is operational with VCCA/VCCB as low

as 1.2V. This allows for universal low-voltage bidirectional translation

between any of the 1.2V, 1.5V, 1.8V, 2.5V and 3.3V voltage nodes.

SOP-16 TSSOP-16

X1QFN-16(1.8×2.6)

1

The UTC U74AVC4T245 device is designed for asynchronous communication between two data buses. The

logic levels of the direction-control (DIR) input and the output-enable ( OE ) input activate either the B-port outputs or

the A-port outputs or place both output ports into the high-impedance mode. The device transmits data from the A

bus to the B bus when the B-port outputs are activated, and from the B bus to the A bus when the A-port outputs

are activated. The input circuitry on both A and B ports is always active and must have a logic HIGH or LOW level

applied to prevent excess ICC and ICCZ.

The UTC U74AVC4T245 device is designed so that the control pins (1DIR, 2DIR, 1 OE and 2 OE ) are supplied

by VCCA. This device is fully specified for partial-power-down applications using IOFF. The IOFF circuitry disables the

outputs, preventing any damaging current backflow through the device when it is powered down.

The VCC isolation feature ensures that if either VCC input is at GND, then both ports are in the high- impedance state.

To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

 FEATURES

* Operation Voltage Range: 1.2~3.6V

* Control Inputs VIH / VIL Levels Are Referenced to VCCA Voltage

* I/Os Are 4.6V Tolerant

* IOFF Supports Partial Power Down Mode Operation