Apparatus and method for preventing current leakage when a low voltage domain is powered down
First Claim
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1. An apparatus, comprising:
- a voltage transition circuit connected between a low voltage domain and a high voltage domain, the voltage transition circuit including a circuit component for preventing a current leakage or direct current when the low voltage domain is powered down;
wherein the voltage transition circuit includes an input-falling-transition circuit, the input-falling-transition circuit comprising;
a p-type transistor; and
an n-type transistor having a drain connected to a drain of the p-type transistor at a contact point, a source connected to a single-rail input, the p-type transistor having a source connected to a VDDH voltage of the high voltage domain;
wherein the n-type transistor has a gate connected to a power down input.
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Abstract
An apparatus and method are provided for preventing a current leakage or direct current when a low voltage domain is powered down. Included is a voltage transition circuit connected between a low voltage domain and a high voltage domain. Such voltage transition circuit includes a circuit component for preventing a current leakage when the low voltage domain is powered down.
19 Citations
18 Claims
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1. An apparatus, comprising:
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a voltage transition circuit connected between a low voltage domain and a high voltage domain, the voltage transition circuit including a circuit component for preventing a current leakage or direct current when the low voltage domain is powered down; wherein the voltage transition circuit includes an input-falling-transition circuit, the input-falling-transition circuit comprising; a p-type transistor; and an n-type transistor having a drain connected to a drain of the p-type transistor at a contact point, a source connected to a single-rail input, the p-type transistor having a source connected to a VDDH voltage of the high voltage domain; wherein the n-type transistor has a gate connected to a power down input. - View Dependent Claims (2, 3, 4, 5, 6, 10, 11, 12)
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7. An apparatus, comprising:
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a voltage transition circuit connected between a low voltage domain and a high voltage domain, the voltage transition circuit including a circuit component for preventing a current leakage or direct current when the low voltage domain is powered down; wherein the voltage transition circuit includes an input-rising-transition circuit, the input-rising-transition circuit comprising; a first n-type transistor having a gate connected to a single-rail input, the first n-type transistor having a source connected to a ground voltage, and a drain connected to an output contact point, the output contact point being connected to a gate of a first p-type transistor of an input-falling-transition circuit; and a second p-type transistor having a drain connected to the output contact point and a gate connected to a contact point of the input-falling-transition circuit; wherein the input-rising-transition circuit has a third p-type transistor connected in series with the second p-type transistor, the third p-type transistor having a drain connected to a source of the second p-type transistor and a gate connected to the single-rail input. - View Dependent Claims (8, 9)
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13. A method, comprising:
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receiving at a voltage transition circuit a power supply voltage from a low voltage domain; converting the power supply voltage from the low voltage domain to a high voltage domain; and preventing a current leakage or direct current when the low voltage domain is powered down; wherein the voltage transition circuit includes an input-falling-transition circuit, the input-falling-transition circuit comprising; a p-type transistor; and an n-type transistor having a drain connected to a drain of the p-type transistor at a contact point, a source connected to a single-rail input, the p-type transistor having a source connected to a VDDH voltage of the high voltage domains; wherein the n-type transistor has a gate connected to a power down input. - View Dependent Claims (14, 15, 16, 17)
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18. A system, comprising:
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means for receiving at a voltage transition circuit a power supply voltage from a low voltage domain; means for converting the power supply voltage from the low voltage domain to a high voltage domain; and means for preventing a current leakage or direct current when the low voltage domain is powered down; wherein the voltage transition circuit includes an input-falling-transition circuit, the input-falling-transition circuit comprising; a p-type transistor; and an n-type transistor having a drain connected to a drain of the p-type transistor at a contact point, a source connected to a single-rail input, the p-type transistor having a source connected to a VDDH voltage of the high voltage domain; wherein the n-type transistor has a gate connected to a power down input.
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Specification