Patent · US Expired

Tri-state-capable driver circuit

US5371423A · kind A · utility

7Cited by

5References

9Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Joerg Berthold · Munich, DE
Gerhard Nebel · Immenstadt im Allgäu, DE
Doris Schmitt-Landsiedel · Ottobrunn, DE

Key dates

Filing date	Aug 17, 1993
Grant date	Dec 6, 1994
Priority date	—
Expiry date	Aug 17, 2013

Classification

Technology area (CPC H)Electricity
CPC primaryH03K19/09448
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A tri-state capable driver circuit or totem pole circuit is formed in BiCMOS technology and includes a selection circuit, first and second drive circuits, and first and second bipolar transistors. A short circuit unit is connected between the base and the emitter of the first bipolar transistor to prevent excessively high inhibit voltages across the base-emitter junction of the first bipolar transistor. The operation of the short circuit unit depends upon signals received at the tri-state activation input.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.