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SN74LVC244A: UART and PWM buffers

JPAlleyne
Expert 1565 points
Part Number: SN74LVC244A
Other Parts Discussed in Thread: SN74LVC541A, , SN74LVC245A, SN74AXC4T245

Can I use the SN74LVC244A for 3v3 UART channel buffers and SN74LVC541A for either 3v3 UART or 3v3 PWM buffering? Is there anything I need to worry about?

Thanks,

JP

  • 0
    TI__Guru 61970 points
    Hi JP,

    You can use the buffers for 3.3V UART interface. As you would know, the UART has RX , TX channels going in opposite channels. Would you need buffering for both? If yes, then you would require direction controlled buffers such as the SN74LVC245A.

    You could also refer to the voltage translation video on UART interface, the SN74AXC4T245 also allows buffering of signals even with 3.3V on both the Vcca and Vccb.
    training.ti.com/voltage-level-translation-uart-interface
  • 0 in reply to ShreyasRao
    Expert 1565 points
    Hi Shreyas,
    Thanks for the quick response. That's correct, I would like to buffer both RX and TX. I have 5 UART channels, a part like SN74LVC245A would give only limited control over direction (changing direction of all UART channels simultaneously, right?). My goal was to use SN74LVC244A for 4 of the UART channels- routing TX (nAn) to the Input and RX (nYn) to the output, since its package provides alternating pins.

    1) Will using SN74LVC244A work as well?
    2) Should I also be fine using the SN74LVC541A part to buffer the PWM lines?
  • 0 in reply to JPAlleyne
    TI__Guru 61970 points

    Hi JP,

    Got it. thanks.

    Yes, you can use both devices for buffering. LVC541A provides flow through architecture with different OE control for octal buffering, and hence may not be P2P replaceable with LVC244A.