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US 8,941,421 B2Granted
Semiconductor device
AssigneeRenesas Electronics Corporation
InventorsShigeki Nakamura, Shintaro Mori, Yoshinori Tokioka, Kenji Tokami
Life of this patent
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Abstract
To provide a semiconductor device provided with a power-on reset circuit that can reliably detect decrease in power-supply voltage. The power-on reset circuit provided on the semiconductor device includes: a first comparison circuit that compares a primary voltage with a reference value; and a second comparison circuit that compares a secondary voltage with the reference value. The power-on reset circuit issues a reset signal based on comparison results of the first and second comparison circuits.
Claims6
A semiconductor device comprising:
- a power supply circuit that generates an internal power supply voltage based on an external power supply voltage;
- a reference voltage generation circuit that generates a reference voltage based on the external power supply voltage;
- an internal circuit that operates by the internal power supply voltage;
- and
- a power-on reset circuit that outputs a reset signal to the internal circuit,
- wherein the power-on reset circuit includes:
- a first comparison circuit that generates a first comparison signal;
- a second comparison circuit that generates a second comparison signal;
- and
- an output circuit that receives the first and second comparison signals as input signals, and generates the reset signal,
- wherein the first comparison circuit inactivates the first comparison signal when the external power supply voltage or a voltage proportional thereto exceeds the reference voltage,
- the second comparison circuit inactivates the second comparison signal when the internal power supply voltage or a voltage proportional thereto exceeds the reference voltage,
- the output circuit activates the reset signal when at least one of the input signals is activated.
10 more elements
Dependencies are inferred from the claim text.