Single power supply logic level shifter circuit
First Claim
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1. An integrated circuit comprising:
- a first voltage domain having a first logical high state;
a second voltage domain having a second logical high state, the second logical high state being greater than the first logical high state; and
a single power supply logic level shifter circuit having;
a single power supply source;
an input node;
an output node, the input node coupled to a sender circuit in the first voltage domain and the output node coupled to a receiver circuit in the second voltage domain, the single power supply source being coupled only to a single power grid in the second voltage domain; and
a charge and break circuit including a three gate delay circuit having an input coupled to the output node and an output coupled to a pull-up transistor, the pull-up transistor output coupled to an intermediate node.
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Abstract
A system and method of shifting a data signal from a first voltage domain having a first logic level to a second voltage domain having a second logic level, the second logic level having a second logical high state greater than a first logical high state in the first logic level and a single power supply logic level shifter circuit having a single power supply source, an input node and an output node, the input node coupled to a sender circuit in the first voltage domain and the output node coupled to a receiver circuit in the second voltage domain, the single power supply source being coupled only to a single power grid in the second voltage domain.
18 Citations
13 Claims
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1. An integrated circuit comprising:
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a first voltage domain having a first logical high state; a second voltage domain having a second logical high state, the second logical high state being greater than the first logical high state; and a single power supply logic level shifter circuit having; a single power supply source; an input node; an output node, the input node coupled to a sender circuit in the first voltage domain and the output node coupled to a receiver circuit in the second voltage domain, the single power supply source being coupled only to a single power grid in the second voltage domain; and a charge and break circuit including a three gate delay circuit having an input coupled to the output node and an output coupled to a pull-up transistor, the pull-up transistor output coupled to an intermediate node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of shifting logic levels from a first voltage to a second voltage comprising:
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the first voltage domain having a first logical high state, the second voltage domain having a second logical high state, the second logical high state being greater than the first logical high state; shifting an input signal from low to high on an input node in a single power supply logic level shifter circuit; discharging an output node of the single power supply logic level shifter circuit to a low state, wherein the single power supply logic level shifter circuit is coupled to a single power supply source, the input node coupled to a sender circuit in the first voltage domain and the output node coupled to a receiver circuit in the second voltage domain, the single power supply source being coupled to a power grid in the second voltage domain, the single power supply including a charge and break circuit including a three gate delay circuit having an input coupled to the output node and an output coupled to a pull-up transistor, the pull-up transistor output coupled to an intermediate node. - View Dependent Claims (10, 11, 12, 13)
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Specification