7 Detailed Description

7.1 Overview

The TXG102x is a 2-bit ground-level translator that uses two individually configurable power-supply rails which

allows it to translate across two different power domains. The device is operational with VCCA and VCCB supplies

as low as 1.71V and as high as 5.5V. The A port is designed to track VCCA and the B port is designed to track

VCCB. In addition to I/O level shifting, this translator can support a difference of -10V to +10V between GNDA

and GNDB. VCCA is referenced to GNDA and VCCB is referenced to GNDB.

The TXG102x device is designed for asynchronous communication between data buses, and transmits data with

fixed direction from the A bus to the B bus on some channels and from the B bus to the A bus on the remaining

channels.

The VCC disconnect feature ensures that if VCC is disconnected with the complementary supply within

recommended operating conditions, outputs are disabled and set to the high-impedance state while the supply

current is maintained. The Ioff-float circuitry ensures that no excessive current is drawn from or sourced into an

input or output while the supply is floating.

Glitch-free power supply sequencing allows either supply rail to be powered on or off in any order while providing

robust power sequencing performance.

7.2 Functional Block Diagram

V

CCA

A1

GNDA

B1Y

GNDB

B2

A2Y

V

CCB

TXG1021 Functional Block Diagram

www.ti.com

TXG1020, TXG1021

SCES997 – JUNE 2025

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