2708 Programming Algorithm?

From: Joe <rigdonj_at_cfl.rr.com>
Date: Mon May 6 15:51:51 2002

   I was just looking at the programming instructions for the 2716 and it's very different than a 2708 in some areas. For example Intel says the programming pulse should be 50ms (55MS MAX). I can't find any mention of a minimum number of programing pulses or minimum total time so I THINK one pulse is supposed to be able to program it. Of course, you'll want to verify the data and reprogram it if necessary. They specificly state "that the 2716 must not be programmed with a DC signal applied to the CE*/PGM input."

   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 - 15:51:51 BST

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