Impedance calibration circuits
AssigneeSK hynix Inc.
InventorHyun Sik JEONG
Life of this patent
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Abstract
Impedance calibration circuits are provided. The impedance calibration circuit includes an operation control signal generator and an impedance calibrator. The operation control signal generator receives temperature code signals to generate an operation control signal enabled when an internal temperature is changed from a first temperature to a second temperature. The impedance calibrator receives an external command signal or the operation control signal to generate pull-up code signals for pulling up an output signal and pull-down code signals for pulling down the output signal according to an external resistor.
Claims20
An impedance calibration circuit comprising:
- an operation control signal generator suitable for receiving temperature code signals to generate an operation control signal enabled when an internal temperature is changed from a first temperature to a second temperature;
- and
- an impedance calibrator suitable for receiving an external command signal or the operation control signal to generate pull-up code signals for pulling up an output signal and pull-down code signals for pulling down the output signal according to an external resistor.
An impedance calibration circuit comprising:
- a latch pulse generator suitable for generating a latch pulse signal enabled when temperature code signals having a logic combination corresponding to a second temperature are inputted thereto after the temperature code signals having a logic combination corresponding to a first temperature are inputted thereto;
- and
- a control signal generator suitable for generating an operation control signal which is initialized in response to a first reset signal and which is enabled in response to the latch pulse signal,
- wherein the operation control signal is a signal for generating pull-up code signals for pulling up an output signal and pull-down code signals for pulling down the output signal according to an external resistor.
An impedance calibration circuit comprising:
- an operation control signal generator suitable for receiving temperature code signals to generate an operation control signal enabled when an internal temperature is changed from a first temperature to a second temperature;
- and
- an impedance calibrator configured to receive an external command signal or the operation control signal to generate a calibration signal when at least one of the external command signal and the operation control signal is enabled.
Dependencies are inferred from the claim text.