1 Features

• Control inputs VIH/VIL levels are referenced to

VCCA voltage

• VCC isolation feature – if either VCC input is at

GND, all are in the high-impedance state

• Fully configurable dual-rail design allows each port

to operate over the full 1.65-V to 5.5-V powersupply

range

• Latch-up performance exceeds 100 mA per JESD

78, class II

• ESD protection exceeds JESD 22

– 4000-V Human-Body Model (A114-A)

– 100-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

2 Applications

• Personal electronic

• Industrial

• Enterprise

• Telecom

3 Description

The SN74LVC8T245-Q1 is an eight bit non-inverting

bus transceiver with configurable dual power

supply rails that enables bidirectional voltage level

translation. The SN74LVC8T245-Q1 is optimized to

operate with VCCA and VCCB set at 1.65 V to 5.5 V.

The A port is designed to track VCCA. VCCA accepts

any supply voltage from 1.65 V to 5.5 V. The B port

is designed to track VCCB. VCCB accepts any supply

voltage from 1.65 V to 5.5 V. This allows for universal

low-voltage bidirectional translation between any of

the 1.8-V, 2.5-V, 3.3-V, and 5.5-V voltage nodes.

The SN74LVC8T245-Q1 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.

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, all outputs 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.

The SN74LVC8T245-Q1 is designed so that the

control pins (DIR and OE) are supplied by VCCA.