Micropower, minimal area DC sensing power-up reset circuit
US6204704A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1999 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Aug 3, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/223
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated circuit including a DC sensing power-up reset (PUR) circuit and method for generating a reset signal. The PUR circuit comprises a first terminal for receiving a supply voltage and a second terminal for receiving a reference voltage corresponding to a low logic state. A first transistor is coupled between the first terminal and a first node, wherein the first transistor switches on when the supply voltage is rising and exceeds a rising trip point voltage. A second transistor is coupled between the first terminal and the first node, and switches off when the supply voltage falls below a falling trip point voltage which is less than the rising trip point voltage. A first inverter is coupled at an input terminal to the first node and at an output terminal to a second node. A resistor is coupled between the first node and the second terminal. The resistor pulls the first node down to the reference voltage while the first and second transistors are both off and limits current flowing through the first and second transistors while either or both of the first and second transistors is on.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.