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At 02:28 PM 8/6/01 -0400, you wrote:
>I would like to see a careful measurement of it in the regions of interest
>(below Vss and above Vdd):

Ok, Bob:-

-I did some measurements above Vdd on a single piece of 12C509JW
-Programmed it to run on all internal and to just sit there with all inputs.
-Connected all pins but power and GP0 to Vss through a 500 ohm resistor.
-Vdd 5.00V

- applied voltage above Vdd through a 100R 1% resistor.

Current       Voltage
(mA)          (V, relative to Vdd)
0.020         0.570
0.050         0.601
0.100         0.625
0.200         0.649
0.500         0.677
1.00          0.699
2.00          0.723
5.00          0.762
10.0          0.807
20.0          0.887

I've attached a gif graph of the results.
A typical 1N4148 diode data sheet is at:
http://www.fairchildsemi.com/ds/1N/1N4148.pdf

- At higher currents, the ratio of currents between the data sheet 1N4148
  and the PIC is about 3:1.

This doesn't seem to change the conclusions that either a series resistor or
a Schottky diode is required in order to be very effective- a 1N4148 with no
resistor should improve the minimum current that would cause latch-up by only
about a factor of 3:1. A small resistor (even 100R) in series with the diode
would improve this MUCH more (more than 500mA in this case).

Best regards,


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Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com
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