Recommendation for a PROM burner
hilpert at cs.ubc.ca
Sun Mar 15 15:21:29 CDT 2015
On 2015-Mar-15, at 8:53 AM, Jon Elson wrote:
> On 03/15/2015 10:46 AM, Paul Koning wrote:
>>> On Mar 15, 2015, at 11:38 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
>>> ...A few points:
>>>> From: Jon Elson
>>>> You won't find ANYTHING that supports 1702 devices, they needed 80 V to
>> 48 volts, according to a 1702A datasheet I just dug up with Google.
While the datasheet says a program voltage of 48V (actually –48V), that's with another of the chips supplies at +12V, so there's a voltage difference at the chip of 60V.
Different programmer designs can shift the voltages different ways relative to GND.
A (period) programmer design I've looked at uses 0, +48, +60; while if one is looking at the datasheet it's –48, 0, +12.
> OK, but the device programmer I had for them had, as best I remember, and 80 V
> power supply. Seems a bit high, and it HAD been a while, but that's what I remember.
> So, yes, the voltage at the chip was lower.
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