Low leakage and data retention circuitry
First Claim
Patent Images
1. An integrated circuit comprising:
- terminals including a common ground terminal and first and second power supply terminals;
a level shifter configured to translate binary data from voltage levels defined by said first power supply terminal and said common ground terminal, to voltage levels defined by said second power supply terminal and said common ground terminal, said level shifter having a sleep transistor, input transistors, and cross-coupled output latching devices between said common ground terminal and an output terminal, said sleep transistor in series with an electrical connection to said common ground terminal, and said input transistors driven by inputs at voltage levels defined by said first power supply terminal and said common ground terminal; and
power management circuitry configured to control power consumed by said level shifter using said sleep transistor.
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Abstract
An integrated circuit includes first circuitry and sleep transistor circuitry. The first circuitry receives input signals and processes the input signals. The first circuitry also retains data in a sleep state that has low leakage. The sleep transistor circuitry is coupled to the first circuitry and receives a sleep signal that has a negative voltage. The sleep circuitry reduces power consumption of the first circuitry in the sleep state to have low leakage based on the sleep signal while retaining the data in the first circuitry.
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Citations
63 Claims
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1. An integrated circuit comprising:
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terminals including a common ground terminal and first and second power supply terminals; a level shifter configured to translate binary data from voltage levels defined by said first power supply terminal and said common ground terminal, to voltage levels defined by said second power supply terminal and said common ground terminal, said level shifter having a sleep transistor, input transistors, and cross-coupled output latching devices between said common ground terminal and an output terminal, said sleep transistor in series with an electrical connection to said common ground terminal, and said input transistors driven by inputs at voltage levels defined by said first power supply terminal and said common ground terminal; and power management circuitry configured to control power consumed by said level shifter using said sleep transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for operating an integrated circuit, the method comprising:
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providing first and second power supply terminals; translating binary data with a level shifter from voltage levels defined by said first power supply terminal and a common ground terminal to voltage levels defined by said second power supply and said common ground terminal; driving level shifter input transistors with voltage levels defined by said first power supply terminal and said common ground terminal; and in a power down mode, controlling power consumed by said level shifter with a sleep transistor while said level shifter retains data. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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26. An integrated circuit comprising:
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terminals including a common ground terminal and first and second power supply terminals; a level shifter built into an input/output pad cell configured to interface with chip core logic, said level shifter configured to translate binary data from voltage levels defined by said first power supply terminal and said common ground terminal, to voltage levels defined by said second power supply terminal and said common ground terminal, said level shifter having a sleep transistor and input transistors, said sleep transistor in series with an electrical connection to said common ground terminal, and said input transistors driven by inputs at voltage levels defined by said first power supply terminal and said common ground terminal; and power management circuitry configured to control power consumed by said level shifter using said sleep transistor. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. An integrated circuit comprising:
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terminals including a common ground terminal and first and second power supply terminals; a level shifter configured to latch data shifted from voltage levels defined by said first power supply terminal and said common ground terminal, to voltage levels defined by said second power supply terminal and said common ground terminal, said level shifter having a sleep transistor and input transistors, said sleep transistor in series with an electrical connection to said common ground terminal, and said input transistors driven by inputs at voltage levels defined by said first power supply terminal and said common ground terminal; and power management circuitry configured to control power consumed by said level shifter using said sleep transistor. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. A method for operating an integrated circuit, the method comprising:
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providing first and second power supply terminals; translating binary data with a level shifter from voltage levels defined by said first power supply terminal and a common ground terminal to voltage levels defined by said second power supply and said common ground terminal; driving level shifter input transistors with voltage levels defined by said first power supply terminal and said common ground terminal; preventing inputs of said level shifter from reaching the voltage level of said first power supply terminal at the same time; and controlling power consumed by said level shifter with a sleep transistor. - View Dependent Claims (57, 58, 59, 60, 61, 62, 63)
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Specification