[sdiy] Using the VEE pin on a 405x Multiplexer

[ASSI]

On Friday 08 October 2010, Justin Owen wrote:
> Well, I got bored and impatient so I plugged VDD: +12V, VSS: 0V and VEE:
> -12V and I'm now running an 11.5V PP AC sine wave through it with no
> probs.

Running CMOS at 24V (Vdd-Vee) does work with some, but not all makes and may 
seriously shorten the life of those that do even if the chip is not getting 
warm (that'd mean some backwards biased diodes are already a bit into 
breakdown).  To be on the safe side, limit yourself to something like 
+-7.5V, that leaves some headroom for temporary overvoltage, for instance 
during power on/off transients.  Or use a multiplexer that is specified for 
higher voltages, like some of the DG series.


Achim.
-- 
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