Semiconductor integrated circuit device and power supply voltage monitor system employing it
US7372289B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 2004 |
| Grant date | May 13, 2008 |
| Priority date | — |
| Expiry date | Feb 6, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/223
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A semiconductor integrated circuit device, i.e. a reset IC(1), includes: a detection circuit (4) for detecting whether an input voltage (Vin) has risen or dropped by comparing the input voltage (Vin) with a reference voltage; a delay circuit (8) for delaying a start-up voltage detection signal from the detection circuit (4) by charging a capacitor (C) connected thereto via a connection terminal (CT), and discharging the capacitor (C) by receiving an output signal (Vout) of a first voltage; a retention circuit (9) for retaining a start-up voltage detection signal delayed by the delay circuit (8); and a driver (10) for generating an output signal (Vout) that becomes a first voltage by a start-up voltage detection signal retained by the retention circuit (9), and generating an output signal (Vout) that becomes a second voltage by a voltage drop detection signal from the detection circuit (4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.