Semiconductor device including voltage level conversion output circuit
AssigneeFujitsu Limited
InventorsKazuya Taniguchi, Toshiyuki Nishii, Hiromichi Mizuno
Life of this patent
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Abstract
A semiconductor device for easily changing an operating voltage of an I/O circuit. The I/O circuit includes a first I/O cell, which operates with a first high-potential power supply, and a second I/O cell, which operates with a second high-potential power supply. The I/O circuit includes a control circuit for selectively activating the first and second I/O cells according to a voltage selection signal. In the I/O circuit, a signal having a voltage according to an operating voltage of the selected I/O cell is generated.
Claims25
A semiconductor device comprising:
- an internal circuit for generating an output signal;
- and
- an output circuit, connected to the internal circuit, for converting a voltage level of the output signal of the internal circuit, the output circuit including:
- a plurality of output cells for generating a plurality of level-converted output signals having different voltages, respectively;
- and
- a control circuit, connected to the plurality of output cells, for selecting one of the plurality of output cells according to a voltage selection signal.
A semiconductor device comprising:
- an internal circuit for generating an output signal;
- and
- an output circuit, connected to the internal circuit, for converting a voltage level of the output signal of the internal circuit, the output circuit including:
- a plurality of first output transistors connected to a plurality of high-potential power supplies and having different voltage, respectively;
- a second output transistor connected to a low-potential power supply and to the plurality of first output transistors;
- and
- a control circuit for selecting one of the plurality of first output transistors according to a voltage selection signal, and causing the selected first output transistor and the second output transistor to perform a level conversion operation.
A semiconductor device, comprising:
- an internal circuit for generating an output signal;
- and
- an output circuit, connected to the internal circuit, for converting a voltage level of the output signal of the internal circuit, the output circuit including:
- a plurality of first output transistors connected to a plurality of high-potential power supplies having different voltages, respectively;
- a second output transistor connected to a low-potential power supply and to the plurality of first output transistors;
- and
- a control circuit for selecting, in a first mode, one of the plurality of first output transistors according to a voltage selection signal and causing the selected first output transistor and the second output transistor to perform a level conversion operation, and for sequentially controlling, in a second mode, the plurality of first output transistors according to the voltage of each of the plurality of high-potential power supplies.
A semiconductor device comprising:
- an internal circuit for generating an output signal;
- and
- an output circuit, connected to the internal circuit, for converting a voltage level of the output signal of the internal circuit, wherein the output circuit includes a plurality of output cells generating a plurality of level-converted output signals having different voltages;
- and
- a plurality of pads respectively connected to the plurality of output cells.
Dependencies are inferred from the claim text.