Patent ID: 7372289
Filing Date: 2008-05-13
Classification: H03K

Abstract:
1. A semiconductor integrated circuit device that monitors an input voltage by comparing the input voltage with a predetermined voltage, and outputs a voltage representing a result of comparison, the semiconductor integrated circuit device comprising: a detection circuit to detect that the input voltage has risen by comparing the input voltage with a reference voltage, and to output a detection signal of the input voltage; a delay circuit to delay the detection signal from the detection circuit by a time constant adjustment method; a connection terminal to which a capacitor is connected; a retention circuit to receive an output of the detection circuit and an output of the delay circuit, and to retain the detection signal delayed by the delay circuit, and a driver to generate a first voltage according to the detection signal retained by the retention circuit and to inhibit an output of the detection signal immediately when the detection circuit detects that the input voltage has dropped, wherein the delay circuit is arranged to delay the detection signal from the detection circuit by charging the capacitor via the connection terminal, and to discharge the capacitor by outputting the detection signal, wherein the delay circuit includes: wherein the semiconductor integrated circuit device is arranged to provide, as an output monitor signal, a voltage generated by the driver.