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K573RF4A 27c64 clone programming.

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neazoi

neazoi

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hello I have two K573RF4A (2764 clones) epromes. The one has a Vpp=21v and the other (which has smaller chip die) has a Vpp=12.5v
Which one should I use for my application?
I have a willem programmer
 

Both Eproms once programmed will behave in exactly the same way, the issue here is which ZIF has your programmer, so you won’t need to make a new adapter for smaller footprint ..

IanP
:wink:
 

IanP said:
Both Eproms once programmed will behave in exactly the same way, the issue here is which ZIF has your programmer, so you won’t need to make a new adapter for smaller footprint ..
:wink:
Click to expand...

I noticed the programmer has a setting for the Vpp. You can chose between 12v, 21v and 23v. One eprom sais Vpp=21.5v. Will it be ok woth just 21v, or does the voltage need to be accurate?
 

I would guess 21V is near enough. To be honest I have never seen an EPROM that used 21V but 21.5V is very common so perhaps they just shortened the number.
If the programmer uses the correct algorithm, it will keep trying to write to the same address until the data can be read back correctly, if the voltage is slightly low it would just write a few more times before the data verified correctly.
As IanP says, the two devices will function identically, it is only their internal programming control that is different.

Brian.
 

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