Glitch-proof powered-down on chip receiver with non-overlapping outputs

Claim 1

A circuit for glitch-proof, power inactivation for an on-chip receiver in an integrated circuit chip, comprising: a chip pad input circuit having an input node connected to a chip pad for receiving logic signal inputs and having a first output node and a second output node selectively connected together through a pass gate; a chip select input circuit having an input connected to receive a chip select signal and an output coupled to said chip pad input circuit, for selectively turning off said pass gate when said chip select signal deselects the integrated circuit chip and applying a first voltage to said first output node and a second output voltage to said second output node of said chip pad input circuit; said chip select input circuit selectively turning on said pass gate when said chip select signal selects said integrated circuit chip and enabling logic signals present on said chip pad to be represented on said first and second output nodes of said chip pad input circuit; a first, two input NAND gate having an output node and an input coupled through an inverter to said first output node of said chip pad input circuit; a second, two input NAND gate having an output node and an input coupled to said second output node of said chip pad input circuit; said output node of said first NAND gate coupled to a second input of said second NAND gate and said output node of said second NAND gate coupled to a second input of said first NAND gate; whereby logic signals present at said chip pad are represented at said output nodes of said first and second NAND gates when said chip select signal selects said chip and alternately, said logic signals present at said chip pad are prevented from being represented at said output nodes of said first and second NAND gates when said chip select signal deselects said chip.