Translate Voltages for UART

Example UART Voltage Translation Block Diagram

See more about this use case in the Logic Minute video Voltage Translation for UART.

Design Considerations

Some devices support up to 5 Mbps UART communication; most are limited to 115 kbps or less
Translators enable communication when devices have mismatched logic voltage levels
Prevent damage to devices that cannot support higher voltage inputs
Improve data rates over discrete translation solutions
Protect controller while peripheral is not connected
[FAQ] What are the power sequencing requirements for the translation device?
[FAQ] What should be done with unused I/O pins of the level translator devices?
Need additional assistance? Ask our engineers a question on the TI E2E™ Logic Support Forum

Recommended Parts

Part Number	AEC-Q100	Supported UART Topology	Voltage Translation Range	Features
TXU0204		2-wire and 4-wire	1.1 V–5.5 V	Schmitt-trigger inputs Integrated pulldown resistors V_CC Isolation and V_CC Disconnect
TXU0204-Q1	✓	2-wire and 4-wire	1.1 V–5.5 V
SN74AXC2T245		2-wire	0.65 V–3.6 V	Direction controlled Glitch-free power supply sequencing V_CC Isolation
SN74AXC2T245-Q1	✓	2-wire
SN74AXC4T245		2-wire and 4-wire
SN74AXC4T245-Q1	✓	2-wire and 4-wire

For more devices, browse through the online parametric tool where you can sort by desired voltage, channel numbers, and other features.

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