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

Manoj Chate
Prodigy 180 points
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 .

  • +1
    Guru 294220 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.