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SN75155: Hi, can you confirm if this connection SN75155 is correct?

Part Number: SN75155

  • Hi Francisco,

    No, V- is intended to connect to a power supply voltage of -4.5 V or lower in order to support RS-232 signaling, which is bipolar in nature. More modern transceiver devices implement a charge pump circuit in order to generate the higher-voltage, bipolar V+ and V- rails from a single logic rail (e.g., 5 V or 3.3 V); you may want to use one of those devices instead. You can find them here:

    http://www.ti.com/rs232

    You can narrow down the search based on the number of TX and RX channels needed and other parameters like ESD immunity as required by your application.

    If you have further questions on this please just let us know.

    Regards,
    Max
  • Thanks for your answer, do you know if there are rs232 converters of a channel 8 pdip type , without external components?
  • Francisco,

    SN75155 would work for this function as long as you modify your circuit to provide -5 V to the VCC- terminal (pin 1).

    Max