I/O protection under over-voltage and back-drive conditions...

Details I/O protection under over-voltage and back-drive conditions... I/O protection under over-voltage and back-drive conditions...

2007-03-21

2009-10-20

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S112000

Reexamination Certificate

active

07605619

ABSTRACT:
In an I/O driver that includes a cascoded pair of PMOS driver transistors connected to a pair of cascaded NMOS driver transistors and that defines a pad output between the PMOS and NMOS driver transistors, a method of providing the CMOS I/O driver with over-voltage and back-drive protection includes providing circuitry for charging the wells of the PMOS transistors either to VDDIO during normal voltage mode by making use of the power supply, or to a common voltage during over-voltage and back-drive operation using the pad voltage.

REFERENCES:
patent: 5465054 (1995-11-01), Erhart
patent: 5537059 (1996-07-01), Asahina
patent: 5917358 (1999-06-01), Sanchez et al.
patent: 7071764 (2006-07-01), Kiani
patent: 7135914 (2006-11-01), Chih et al.

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