12C509-JW How long to erase?
Peter L. Peres email (remove spam text)
On Mon, 2 Nov 1998, James Cameron wrote:
> Anyone know where the specification from Microchip is for this?
> The unit I have on loan is an 8W 253.7nm 6.4mW/cm2 "Ango", with a draw
> just big enough to require 12C509-JW's to be dismounted from the machine
> pin sockets I'd like to keep them in. ;-}
If you halve the distance the power grows fourfold (inverse square law).
Your distance is smaller than mine was (since the machined socket must be
removed - guess why I choose 12 mm above DIL chip?). Erasure power should
be written somewhere in the specs. Used to be with EPROMs.
> My first go was five minutes, and it seemed blank afterwards. I even
> remembered to record the OSCCAL value.
See how long it takes by checking every minute and do it thereafter for
twice or thrice as long.
In reply to: <363CFE1C.B8AD22C7@stl.dec.com>
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