Unisonic Technologies(UTC)

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/VCCBas low as 1.2V. This allows for universal low-voltage bidirectional translationbetween any of the 1.2V, 1.5V, 1.8V, 2.5V and 3.3V voltage nodes.

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, 1OEand 2OE) 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

* RDS(ON) ≤ 12 Ω @ VGS=0V, ID=150mA

* Depletion Mode (Normally On)

* Proprietary Advanced Planar Technology

* Rugged Polysilicon Gate Cell Structure

* Fast Switching Speed

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