This 16-bit noninverting bus transceiver uses two separate configurable power-supply
rails. The SN74AVCH16T245 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 SN74AVCH16T245 control pins (1DIR, 2DIR, 1OE, and
2OE) are supplied by VCCA.
The Ioff circuitry disables the outputs, preventing damaging
current backflow through the device when it is powered down. This device is fully specified for
partial-power-down applications using Ioff.
The VCC isolation feature ensures that if either
VCC input is at GND, then both ports are in the high-impedance state.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of
pullup or pulldown resistors with the bus-hold circuitry is not recommended.
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
The SN74AVCH16T245 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 are effectively isolated.
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