Steve,
Is there a reason why you're trying to design your own 2708 programmer instead of using a commercail one? I have a DATA I/O model 19 with a Gang Programming Module and 2708 personality module if you need to use it.
Joe
At 08:21 AM 5/6/02 -0700, you wrote:
>I obtained a bunch of 2708 UVEPROM's, and I'd like to
>be able to program them. As you may know, they require
>a different algorithm than the 2716 and on, and three
>voltages, +5, +12, and -5.
>
>I'm building a little board that will program 1/2 (the
>upper or lower) of a 2716 to a 2708 (I can program
>2716's). But I can't find a description of the
>algorithm that is detailed enough. What I think I know
>is:
>
>1. The /OE line must be high
>2. select address and data (start at addr 0)
>3. bring PGM line from 0 to 27 volts for 1 mSec, then
>drop back to 0 (this seems very strange)
>4. repeat 100 times per address (not all at once,
>increment the address lines and loop to avoid
>"overheating" a byte.
>5. drop /OE and verify.
>
>
>Does anybody have an authoritative description, and a
>current requirement for the +5, +12, -5, and
>programming pulse? Thanks.
>
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Received on Mon May 06 2002 - 20:03:06 BST