I have double checked the maximum ratings and you are right, I missed that.
So much for "opened windows".  :-(

Thank you.

-----Original Message-----
From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU] On
Behalf Of Dave Dilatush
Sent: Friday, April 23, 2004 12:15 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PICLIST] [EE:] Analog switches

Nearly all analog switches allow switching of analog signals ONLY within the
supply voltage boundaries; that is, the analog signal must be "between the
rails" at all times.

In the case of the MAX323, the data sheet gives a signal range of -0.3V to
(V+ +0.3V) in its ABSOLUTE MAXIMUM RATINGS section, indicating that going
outside this range may permanently damage the device.

So, switching a 24 volt line with a MAX323 powered from 3 volts would not
work.

HTH...

Dave D.

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