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A TECHNIQUE FOR IMPLEMENTING POWER SUPPLY SEQUENCE INDEPENDENT CIRCUITS

IP.com Disclosure Number: IPCOM000228921D
Publication Date: 2013-Jul-12
Document File: 4 page(s) / 197K

Publishing Venue

The IP.com Prior Art Database

Abstract

The circuits that work on higher than device rating power supply (e.g. 3.3V IO using 1.8V devices), require intermediate voltage (1.8v) for device protection.

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A technique for implementing power supply sequence independent circuits

Abstract

The circuits that work on higher than device rating power supply (e.g. 3.3V IO using 1.8V devices), require intermediate voltage (1.8v) for device protection.

A method is suggested whereby an internal power supply or voltage can be used for device protection during power up and down scenarios such that the transistors are always protected. This allows independent power sequencing to be used on application level which is preferred by customers. The circuits that work on higher than device rating power supply (e.g. 3.3V IO using 1.8V devices), require intermediate voltage (1.8v) for device protection.

Introduction

The idea which we are suggesting is a technique of forcing intermediate internal    voltage thus enabling independent power sequencing for intermediate power supply.    We suggest adding a low area low current regulator which provides the required low voltages for the circuits during power up/down and switching mechanism to external supply voltage once all the supplies are powered up.

Loading on intermediate voltages will be high after system comes out of reset and clocks are up during functional operation. In this case the external power source is used as power supply for circuit.

Any time the external power supply, drops below a certain level; the internal protection voltage is passed to circuit. Only circuit protection is guaranteed during this event.

Functional Description

A te...