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SN75155 Maximum Supply Rails

Thomas Knotts
Prodigy 10 points

The data sheet lists the supplies as +/-4.5 to +/-15 but they also show the absolute maximum supply voltage as +/-15. I would expect at least +/-16V listed there. Does this mean that if I am running at say +/-15.4 due to power-supply variation that the long-term reliability of the part is in jeopardy?

  • 0
    TI__Guru**** 165326 points

    Thomas,

    The datasheet does have 15V as a hard limit. I don't expect the device would be affected by an extra 0.5V on each rail.

    I can order some samples and test to see how much voltage margin is typical. You could add a series diode to the VCC+ and VCC- pin to drop the voltage a little and prevent reverse current flow when the board is unpowered but there is a voltage applied to RA or DY pins from RS232 port.

  • 0 in reply to Ron Michallick
    TI__Guru**** 165326 points
    Thomas,

    I swept VCC+ and VCC- up to +/-35V and monitored supply current and output voltage.
    There was no problems observed during this short test.

    Therefore I do not expect the the tolerance of the +/-15V supply will cause any issues.