LSF0204: 3.3V to 1.8V UART bi-directional level translation

Manoj Chate

Part Number: LSF0204
Other Parts Discussed in Thread: SN74AXC4T245

Hello team,

I'm trying to use LSF0204DRGYR for UART level translation (3.3V to 1.8V) with signals - CTS,RTS,TXD,RXD . Master voltage is 3V3 (VREF_B) and other end voltage is 1V8 (VREF_A).

I need to confirm if my implementation will work or not as translation will happen first from 3.3V to 1.8V .

over 4 years ago

+1 Clemens Ladisch over 4 years ago

Guru 316470 points

The LSF needs pull-up resistors at all its outputs.

All four UART signals are unidirectional, so you do not actually need a bidirectional translator. The SN74AXC4T245 is cheaper and more robust in this application.

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LSF0204: 3.3V to 1.8V UART bi-directional level translation