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SolaiKannan
- 21st January 2012, 10:14
can anyone tell me the suitable EEPROM for this pic 16f877a.i need a memory space of about 30K
HenrikOlsson
- 21st January 2012, 13:47
Hi,
I'm using the SST25 series of SPI memory devices, technically it's FLASH and not EEPROM but I don't think it matters. A 512kBit (64kByte) device costs around 60 cents. Since it's SPI you can use SHIFTOUT/SHIFTIN or you can use the MSSP module of the '877 for increased performance. These are not 5V devices though.

I'm sure though that "any" device will work just fine.
Demon
- 21st January 2012, 15:48
I like the I2C external EEPROMs like the 24AA256:
http://ww1.microchip.com/downloads/en/devicedoc/21203m.pdf

Find the right serial EEPROM for you:
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2697

Robert
languer
- 22nd January 2012, 01:51
For adding ROM you could look at SPI EEPROMS (http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2697) or SPI FRAM (http://www.ramtron.com/products/nonvolatile-memory/serial.aspx). For adding RAM you could look at SPI RAM (http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2698).
SolaiKannan
- 23rd January 2012, 15:53
thank you to all for giving me some nice ideas