This 16-bit noninverting bus transceiver uses two separate configurable power-supply
rails. The SN74AVC16T245 device is optimized to operate with
VCCA/VCCB set at 1.4 V to 3.6 V. The device is
operational with VCCA/VCCB as low as 1.2 V. The A
port is designed to track VCCA. VCCA accepts any
supply voltage from 1.2 V to 3.6 V. The B port is designed to track VCCB.
VCCB accepts any supply voltage from 1.2 V to 3.6 V. This allows for
universal low-voltage bidirectional translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, and
3.3-V voltage nodes.
The SN74AVC16T245 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 outputs so the buses effectively are isolated.
The SN74AVC16T245 control pins (1DIR, 2DIR, 1OE, and
2OE) are supplied by VCCA.
This device is fully specified for partial-power-down applications using
Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
The VCC isolation feature ensures that if either
VCC input is at GND, 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 VCCA through a pullup resistor;
the minimum value of the resistor is determined by the current-sinking capability of the
driver.
