[SI-LIST] : Undoped or Non-doped Isolation Transistor

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From: Farrokh Mottahedin ([email protected])
Date: Mon Aug 07 2000 - 09:58:01 PDT


While trying to understand the operation of a complex 3.3 volt I/O cell, I
noticed one transistor that is designated "non-doped" device. This device is
on the output of a bi-di cell, and if I understand correctly, provides
isolation in case of bus "contention" involving another 5 volt-based
interface on the same bus. I have been unable to find any information or
even a mention of non-doped devices in my standard textbooks. My question
is: How does a non-doped device operate, and how does it differ from all the
other P and N-FETs?

Regards,

Farrokh Mottahedin

Quantum Corp.
500 McCarthy Blvd.
Milpitas, CA 95035
(408)324-7934
[email protected]

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