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Input/output circuit for use with various voltages

  • US 4,581,551 A
  • Filed: 03/28/1984
  • Issued: 04/08/1986
  • Est. Priority Date: 03/28/1984
  • Status: Expired due to Fees
First Claim
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1. An input/output circuit having a terminal for either receiving an input signal or providing an output signal, comprising:

  • differential amplifier means having a noninverting input coupled to the terminal, an inverting input, and an output, the differential amplifier having a predetermined offset voltage between the noninverting and inverting inputs and providing in response to a control signal an output voltage which is proportional to a differential input voltage potential between the inverting and noninverting inputs;

    output driver means having an output, for providing a driver output signal in response to both the output voltage of the differential amplifier and an output enable signal;

    current sensing means coupled between the terminal and the output of the output driver means, for regulating the driver output signal and limiting current at the terminal; and

    reference voltage means coupled between the inverting input of the differential amplifier means and the output of the output driver means, for coupling an input voltage having a predetermined relationship to the magnitude of the driver output signal to the inverting input of the differential amplifier means.

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