Logic interface circuit with high stability and low rest current

US4810902A · kind A · utility

Assignee

• SGS Microelettronica S.p.A. · IT

Inventors

• Sandro Storti · Milano, IT
• Dominico Rossi · Mortara, IT
• Giuseppe Di Natale · Augusta, IT

Key dates

• Filing date: Sep 30, 1987
• Grant date: Mar 7, 1989
• Expiry date: Sep 30, 2007

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03K19/017518
• WIPO field: Control
• WIPO sector: Instruments

Abstract

An improved logic interface circuit having both a low current drain under rest conditions and a great stability in respect of temperature variations, is based on an original and effective implementation of the so-called bandgap-type voltage reference circuit, according to which the intrinsic gain of the bandgap system is not utilized, as normally happens in such voltage reference circuits for providing a negative feedback capable of compensating the temperature coefficient of the V.sub.be, but for obtaining, under open loop conditions, a transition of the output of the circuit when the input of the circuit crosses a certain threshold voltage.