Semiconductor device

摘要

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.

主权项

1. A semiconductor device comprising:
a first power terminal supplied a first external power supply, a second power terminal supplied a second external power supply; a power supply circuit that generates an internal power supply voltage based on voltage difference between the first external power supply and the second external power supply; 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.