MCUmall EPROM BIOS Chip Burner Forum - How Burn 27c256 without 12.5V ?

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Using The Enhanced/Dual power Willem Programmer

How Burn 27c256 without 12.5V ?

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vincentes2000

France
6 Posts

Posted - 12/09/2005 : 05:38:31

Hi

I have The Enhanced Willem Programmer, i want burn a eprom 27c256, this VPP is 12.5V, I can burn this chip with 12 V (normal VPP)? or i must modify my burner "Enhanced Willem Programmer"

Thank's

Vincent

Reply #1

silver_surfer

3 Posts

Posted - 12/09/2005 : 17:23:35

yes you cn use 27c256 with 12 volts just fine. I do near eveyday.

Reply #2

USA
46 Posts

Posted - 04/15/2006 : 08:36:08

Hi,

quote:
Originally posted by silver_surfer

yes you cn use 27c256 with 12 volts just fine. I do near eveyday.

You might want to read this post http://www.willem.org/cgi-bin/yabb2/YaBB.pl?num=1144884107 regarding reliability. Programming with out-of-spec VPP isn't as bad as not setting VCC correctly, but you shouldn't make the mistake of assuming that programming and verifying in your programmer is the same as programming the device reliably...

The amount of charge stored on the floating gate is affected by both the programming VCC (affects the number of electrons in the channel that can be deposited on the floating gate) and VPP (helps attract electrons from the channel).

If you program at low VPP and incorrect VCC (which most with Willem programmers do), you're affecting program margin and that can mean reduced reliability.

HTH,
Dennis

Edited by - DL on 04/15/2006 08:42:35

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