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Pseudo-dynamic circuit for multi-voltage timing interlocks

  • US 9,953,687 B1
  • Filed: 10/21/2016
  • Issued: 04/24/2018
  • Est. Priority Date: 10/21/2016
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • an interlock circuit coupled to receive a first input signal from a first voltage domain and a second input signal from a second voltage domain, the interlock circuit including,a keeper circuit having a pull-up portion coupled to the second input signal and configured to maintain an output signal on an output node of the interlock circuit at a first high voltage level associated with the first voltage domain until the first input signal is at the first high voltage level and the second input signal is at a second high voltage level associated with the second voltage domain; and

    a pull-down circuit coupled to receive the first input signal and the second input signal, wherein the keeper circuit is configured to be weaker than the pull-down circuit, to thereby cause the output node to transition from the first high voltage level to a low voltage level responsive to the second input signal transitioning to the second high voltage level from the low voltage level while the first input signal is at the first high voltage level.

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