1 Features

• Up and down translation across 0.65 V to 3.6 V

• Operating temperature: –40°C to +125°C

• Designed with glitch suppression circuitry to

improve power sequencing performance

• Maximum quiescent current (ICCA + ICCB) of 10μA

(85°C maximum) and 16μA (125°C maximum)

• Up to 500Mbps support when translating from 1.8

to 3.3V

• VCC isolation feature:

– If either VCC input is below 100mV, all

I/Os outputs are disabled and become highimpedance

• Ioff supports partial-power-down mode operation

• Latch-up performance exceeds 100mA per JESD

78, Class II

• ESD protection exceeds JESD 22:

– 8000-V human body model

– 1000-V charged-device model

2 Applications

• Enterprise and communications

• Industrial

• Personal electronics

3 Description

The SN74AXC1T45 is a single-bit noninverting bus

transceiver that uses two separate configurable

power-supply rails. The device is operational with both

VCCA and VCCB supplies as low as 0.65 V. The A port

is designed to track VCCA, which accepts any supply

voltage from 0.65 V to 3.6V. The B port is designed

to track VCCB, which also accepts any supply voltage

from 0.65 V to 3.6V.

The DIR pin determines the direction of signal

propagation. With the DIR pin configured HIGH,

translation is from Port A to Port B. With DIR

configured LOW, translation is from Port B to Port A.

The DIR pin is referenced to VCCA, meaning that its

logic-high and logic-low thresholds track with VCCA.

This device is fully specified for partial-power-down

applications using the Ioff current. The Ioff protection

circuitry ensures that no excessive current is drawn

from or to an input, output, or combined I/O that

is biased to a specific voltage while the device is

powered down.

The VCC isolation feature ensures that if either VCCA

or VCCB is less than 100mV, both I/O ports enter a

high-impedance state by disabling their outputs.

The glitch suppression circuitry enables either supply

rail to be powered on or off in any order, providing

robust power sequencing performance.