Semiconductor unit

Details Semiconductor unit Semiconductor unit

2005-11-23

2009-02-24

Graybill, David E (Department: 2894)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

C361S100000, C327S389000, C327S525000

Reexamination Certificate

active

07495872

ABSTRACT:
To improve the ESD protection of a circuit receiving a signal. An inverter circuit INV1is connected to ground wiring GND1for supplying power, and is connected to power supply wiring VDD1via a PMOS transistor MP5. An inverter circuit INV2is connected to ground wiring GND2and power supply wiring VDD2for supplying power, and its input node is connected to an output node of the inverter circuit INV1. Further, the ground wiring GND1and the ground wiring GND2are connected via a protection element PE0. During normal operation, the output of an inverter circuit INV3goes to an H level, the output of an inverter circuit INV4goes to an L level, and the PMOS transistor MP5is turned on. When ESD is applied, the power supply wiring VDD2is place in a floating state, the output of the inverter circuit INV4goes to an H level, the PMOS transistor MP5is turned off, and a current that occurs when EDS is applied does not flow into the inverter circuit INV2.

REFERENCES:
patent: 5255146 (1993-10-01), Miller
patent: 5387823 (1995-02-01), Ashizawa
patent: 5604655 (1997-02-01), Ito
patent: 5679971 (1997-10-01), Tamba et al.
patent: 5784235 (1998-07-01), Otomo et al.
patent: 5838146 (1998-11-01), Singer
patent: 5886558 (1999-03-01), Iijima et al.
patent: 6034854 (2000-03-01), Suga
patent: 6078083 (2000-06-01), Amerasekera et al.
patent: 7123054 (2006-10-01), Satou et al.
patent: 7154724 (2006-12-01), Wu et al.
patent: 2002/0057618 (2002-05-01), Yamagata et al.
patent: 2004/0247036 (2004-12-01), Hedberg et al.
patent: 2005/0047042 (2005-03-01), Satou et al.
patent: 2005/0088396 (2005-04-01), Tobita
patent: 2005/0213274 (2005-09-01), Wu et al.
patent: 2006/0114047 (2006-06-01), Irino
patent: 8-37238 (1996-02-01), None
patent: 9-172146 (1997-06-01), None

Affiliated with

Also associated with

Rating

Semiconductor unit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Semiconductor unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Semiconductor unit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4097587