 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