LEVEL SHIFTER CIRCUIT
First Claim
1. A level shifter circuit comprising:
- a low voltage circuit for performing a switching operation in accordance with a first switching voltage, which changes in relation with an input voltage applied to an input terminal, to output voltage between a low drive voltage and a low reference voltage, which is lower than the low drive voltage;
a high voltage circuit for performing a switching operation based on a second switching voltage, which is higher than the first switching voltage and changes in relation with the input voltage, to output voltage between a high drive voltage and a high reference voltage, which is lower than the high drive voltage;
a potential adjustment circuit for shifting an output of the high voltage circuit from the high drive voltage to the low drive voltage and from the high reference voltage to the low reference voltage; and
an output selection circuit for outputting a signal in accordance with an output of the potential adjustment circuit when a signal at the input terminal shifts from a low level to a high level, and for outputting a signal in accordance with an output of the low voltage circuit when the signal at the input terminal shifts from a high level to a low level.
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Accused Products
Abstract
A level shifter circuit, which includes a Schmitt trigger function, shifts voltage of a high level signal into a low voltage and shifts a signal at an intermediate value of an input voltage. The level shifter circuit includes an input terminal connected to low and high voltage circuits. The low voltage circuit outputs a low drive voltage or ground voltage. The high voltage circuit outputs a high drive voltage or a high reference voltage, which is supplied to an RS latch circuit via a potential adjustment circuit at a level equal to an output potential at the low voltage circuit. The RS latch circuit uses the output of the potential adjustment circuit when the input voltage shifts to a high level and uses the output of the low voltage circuit when the input voltage shifts to a low level.
9 Citations
5 Claims
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1. A level shifter circuit comprising:
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a low voltage circuit for performing a switching operation in accordance with a first switching voltage, which changes in relation with an input voltage applied to an input terminal, to output voltage between a low drive voltage and a low reference voltage, which is lower than the low drive voltage; a high voltage circuit for performing a switching operation based on a second switching voltage, which is higher than the first switching voltage and changes in relation with the input voltage, to output voltage between a high drive voltage and a high reference voltage, which is lower than the high drive voltage; a potential adjustment circuit for shifting an output of the high voltage circuit from the high drive voltage to the low drive voltage and from the high reference voltage to the low reference voltage; and an output selection circuit for outputting a signal in accordance with an output of the potential adjustment circuit when a signal at the input terminal shifts from a low level to a high level, and for outputting a signal in accordance with an output of the low voltage circuit when the signal at the input terminal shifts from a high level to a low level. - View Dependent Claims (2, 3, 4, 5)
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Specification