Microchip says...

"The current datasheets specify Vss-0.3 to Vdd + 0.3v"
=A0
"If you start curve tracing the devices you will find that the ESD protecti=
on diodes =

clamp at 0.6v. =A0The 0.3v specification is intended to prevent the input p=
rotection =

diodes from conducting. =A0We have learned that as more analog peripherals =
are =

placed on the device, including low power POR/BOR circuits, the currents cr=
eated =

when the ESD diodes clamp can cause very bad behavior. =A0In one example, t=
he =

POR circuit asserted POR when the ESD diodes were conducted. =A0We do not w=
ant =

the ESD diodes conducting so we have specified the voltage range more tight=
ly."

-- =

Brent Brown, Electronic Design Solutions
16 English Street, St Andrews,
Hamilton 3200, New Zealand
Ph: +64 7 849 0069
Fax: +64 7 849 0071
Cell: 027 433 4069
eMail:  brent.brown@clear.net.nz



-- =

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