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US 2006/0232294 A1Published application
Input Termination Circuits and Methods for Terminating Inputs
AssigneeSamsung Electronics Co., Ltd.
InventorHo-Young Song
Life of this patent
Estimating the term…
Abstract
An input signal provided to an input terminal is terminated by coupling the input terminal to a ground voltage through a pull down transistor if the input signal at the input terminal is at a “high” level and coupling the input terminal to a power voltage through a pull up transistor if the input signal at the input terminal is at a “low” level. Termination circuits are provided including on die termination circuits.
Claims15
An input termination circuit, comprising:
- a pull down circuit that is configured to terminate an input signal to a ground voltage level responsive to the input signal being at a “high” level;
- and
- a pull up circuit that is configured to terminate the input signal to a power voltage level responsive to the input signal being at a “low” level, the pull up circuit comprising:
- a first comparator circuit configured to be enabled responsive to the termination control signal and configured to compare a reference voltage and the input signal;
- a pull up transistor having controlled terminals coupled to a power voltage and a terminal to which the input signal is applied and a controlling terminal coupled to an output of the first comparator circuit;
- and
- a first reset transistor coupled to the controlling terminal of the pull up transistor and responsive to the termination control signal to turn off the pull up transistor when the termination control signal is inactivated.
4 more elements
An input termination circuit, comprising:
- a pull up transistor configured to pull up an input terminal to a power voltage level;
- a pull down transistor configured to pull down the input terminal to a ground voltage;
- and
- a control circuit responsive to a termination control signal and to a signal applied to the input terminal to turn on the pull down transistor and turn off the pull up transistor in response to the input signal transitioning to a “high” level and to turn off the pull down transistor and turn on the pull up transistor in response to the input signal transitioning to a “low” level, wherein the control circuit comprises:
- a first comparator circuit configured to be enabled responsive to the termination control signal and configured to compare a reference voltage and the input signal and having an output coupled to a controlling terminal of the pull up transistor;
- a first reset transistor coupled to the controlling terminal of the pull up transistor and responsive to the termination control signal to turn off the pull up transistor when the termination control signal is inactivated;
- a second comparator circuit configured to be enabled responsive to the termination control signal and configured to compare a reference voltage and the input signal and having an output coupled to a controlling terminal of the pull down transistor;
- and
- a second reset transistor coupled to the controlling terminal of the pull down transistor and responsive to the termination control signal to turn off the pull down transistor when the termination control signal is inactivated.
6 more elements
Dependencies are inferred from the claim text.