On Tue, 22 Dec 1998, James Cameron wrote:

> Does anybody know what impact this may have on programming the 12C509-JW
> parts?

No, but I know from experience that it has none on several 16C54JWs and a
small score of 16C54XT-04 OTPs.

There is no warranty of course, but the spec sheet gives a range between
10 and 1000 usec for the programming pulse for normal locations and
between 1000 and 10,000 for the fuses on the '54 ?

Please check these numbers, they are off of my head now.

I'd like to add that I wrote a programmer driver that tabulated the no. of
pulses required to program each location and the number was invariably of
4 for all locations, even after several tens of erasures on the JW parts,
for 100 usec pulses. This is from the time when the programming specs
specified 3 x over-programming.

Peter