8-Bit Dual-Supply Bus Transceiver with Configurable Voltage-Level Shifting and 3-State Outputs

This 8-bit noninverting bus

transceiver uses two separate configurable power-supply rails. The SN74AVC8T245 is

optimized to operate with V CCA/V CCB set at 1.4 V to 3.6 V. The

device is operational with V CCA and V CCB as low as 1.2 V. The

A port is designed to track V CCA. V CCA accepts any supply

voltage from 1.2 V to 3.6 V. The B port is designed to track V CCB.

V CCB 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 SN74AVC8T245 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.

The SN74AVC8T245 is designed so that

the control pins (DIR and OE) are supplied by

V CCA.

The SN74AVC8T245 is compatible with a

single-supply system and can be replaced later with a ’245 function, with minimal

printed circuit board redesign.

This device is fully specified for

partial-power-down applications using I off. The I off circuitry

disables the outputs, thus preventing damaging current backflow through the device

when it is powered down.

The V CC isolation feature

allows both ports to be in the high-impedance state when either V CC input

is at GND.

To put the device into the

high-impedance state during power up or power down, tie OE to

V CC through a pullup resistor; the current-sinking capability of the

driver determines the minimum value of the resistor.