초록 ▼

A level detection circuit, such as a Schmitt trigger circuit, has an input threshold voltage which varies depending upon the detection circuit output. The circuit includes a level detection stage, circuitry for switching the level detection stage between an active and a standby mode and a storage de

A level detection circuit, such as a Schmitt trigger circuit, has an input threshold voltage which varies depending upon the detection circuit output. The circuit includes a level detection stage, circuitry for switching the level detection stage between an active and a standby mode and a storage device for storing data indicative of the input threshold voltage when the level detection stage is in the standby mode and for controlling the level detection stage using the stored data so that the stage will retain the same input threshold voltage that existed when the level detection stage was switched to the standby mode.

대표청구항 ▼

[ I claim:] [1.] A level detection circuit for producing an output signal indicative of an input signal and switchable between an active mode and a standby mode, said level detection circuit comprising:a level detection stage having an input for receiving the input signal, said level detection stage

[ I claim:] [1.] A level detection circuit for producing an output signal indicative of an input signal and switchable between an active mode and a standby mode, said level detection circuit comprising:a level detection stage having an input for receiving the input signal, said level detection stage having a first threshold voltage when a level detection stage output is at a first state and a second threshold voltage, different from the first threshold voltage, when the level detection stage output is at a second state;first enable circuitry coupled to the level detection stage for providing a current path through the level detection stage when the level detection circuit is in the active mode and for interrupting the current path when the level detection circuit is in the standby mode; anda storage device configured to store a value which represents the state of the level detection stage output prior to the level detection circuit switching from the active mode to the standby mode and to set the level detection stage output state to one of the first and second states based upon the stored value when the level detection circuit switches from the standby mode to the active mode.