EEPROMs compatible with multi-io board?

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EEPROMs compatible with multi-io board?

Postby tranter » Mar Tue 06, 2012 12:15 pm

I just put together the Multi-i/o board and it is working great. I am able to program the EEPROM that came with it, but an EEPROM that I purchased is not writing. I'm wondering if it is compatible.
It is a Xicor X28C64A-25. It looks like I can read it okay as all locations are FF.
The Multi-i/o board came with an Atmel AT28C64B-15 and my Replica 1 came with an Atmel AT28HC64-70.
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Re: EEPROMs compatible with multi-io board?

Postby tranter » Mar Wed 14, 2012 5:40 pm

Digging into the data sheet It seems that this Xicor EEPROM doesn't support the "byte write" mode that makes it acts like a RAM chip. The datasheets for other 2864 type devices I looked at all support this.

Vince, is there a particular EEPROM and supplier you can recommend for the Multi I/O board? Mine was this part from Jameco which can come from any number of different manufacturers: https://www.jameco.com/webapp/wcs/store ... 1_74827_-1

Note: that the EEPROM that came with my Multi I/O board worked fine, this is one I bought.
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Re: EEPROMs compatible with multi-io board?

Postby vbriel » Mar Wed 14, 2012 6:56 pm

Try these guys:

http://www.unicornelectronics.com/IC/EEPROM.html

get the 250ns version, still cheap and works great. For some reason the Jameco ones do not work on my programmer ro the multi I/O boards. The specs are correct. Then again, I've bought ATmega microcontrollers from them that were counterfit and did not work either.

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