Level conversion circuit and semiconductor device
AssigneeFujitsu Semiconductor Limited
InventorsTomoya Kakamu, Hisao Suzuki, Yuji Sekido
Life of this patent
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Abstract
A first conversion circuit converts a first clock signal based on a signal level of a first voltage into a second clock signal based on a signal level of a second voltage. A flip-flop circuit supplied with the first voltage as an operation voltage latches and outputs a signal, which is based on the signal level of the first voltage, in accordance with the first clock signal. A second conversion circuit supplied with the second voltage as an operation voltage converts a signal level of an input signal, which is based on an output signal of the flip-flop circuit, into the signal level of the second voltage in synchronization with the second clock signal.
Claims20
A level conversion circuit comprising:
- a first conversion circuit that converts a first clock signal based on a signal level of a first voltage into a second clock signal based on a signal level of a second voltage;
- a flip-flop circuit supplied with the first voltage as an operation voltage, wherein the flip-flop circuit latches and outputs a signal, which is based on the signal level of the first voltage, in accordance with the first clock signal;
- and
- a second conversion circuit including
- a converter supplied with the second voltage as an operation voltage and supplied with the second clock signal, wherein the converter converts a signal level of an input signal, which is based on an output signal of the flip-flop circuit, into the signal level of the second voltage in synchronization with the second clock signal, and
- a latch circuit that latches the signal level of the second voltage.
A semiconductor device comprising:
- a first circuit operating at a first voltage;
- a second circuit operating at a second voltage different from the first voltage;
- and
- a level conversion circuit supplied with the first and second voltages,
- wherein the level conversion circuit includes:
- a first conversion circuit that converts a first clock signal based on a signal level of the first voltage into a second clock signal based on a signal level of the second voltage;
- a flip-flop circuit supplied with the first voltage as an operation voltage, wherein the flip-flop circuit latches and outputs a signal, which is based on the signal level of the first voltage, in accordance with the first clock signal;
- and
- a second conversion circuit including
- a converter supplied with the second voltage as an operation voltage and supplied with the second clock signal, wherein the converter converts a signal level of an input signal, which is based on an output signal of the flip-flop circuit, into the signal level of the second voltage in synchronization with the second clock signal, and
- a latch circuit that latches the signal level of the second voltage.
Dependencies are inferred from the claim text.