This 4-bit noninverting bus transceiver uses two separate configurable power-supply
rails. 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. The SN74AVCH4T245 is optimized to operate with
VCCA/VCCB set at 1.4 V to 3.6 V. It is operational
with VCCA/VCCB as low as 1.2 V. 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.
The SN74AVCH4T245 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 SN74AVCH4T245 device 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, then both ports are in the high-impedance state. The
bus-hold circuitry on the powered-up side always stays active.
Active bus-hold circuitry holds unused or undriven data inputs at a valid logic state.
Use of pull-up or pull-down resistors with the bus-hold circuitry is not recommended. The bus-hold
circuitry on the powered-up side always stays active.
To ensure the high-impedance state during power up or power down,
OE should be tied to VCC through a pull-up resistor;
the minimum value of the resistor is determined by the current-sinking capability of the
driver.
