NVRAM recommendation

Pleeeeease be more specific. How many bytes/kbytes you need? What access speed do you need? What interface (parallel/SPI/I2C)?

r Wolf

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When I did a Google Search I must have had around 208,000 hits to narrow down from. Did you want a RTC built in as well?

has them with RTC's too. I typically use NVRAMs from One I used a while back is bq4010/bq4010Y but they have several to choose from. TI does send out samples too. sells them as well as several others.

there used to be MOSTEK, I think its STI now. Maxim of course and Benchmarq (now TI)

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Parallel:

Serial:

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Be a bit careful - these are FRAM rather than SRAM + EEPROM devices.

This gives far superior write cycles compared to EEPROM, but also gives finite read cycles (for 5V devices at least).

You can usually live with this but don't leave your parameters there for continuous run-time accessing

Try

Phil W

ST (ST Microelectronics)

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It just stores some bits when power suddenly shut down. So the requirements are:

1. a couple bits is enough. 64, 128 or 256 bits is sufficient.
2. access time could be 1us or less. Seppd is not a issue.
3. either SPI or I2C is OK. uC is equipped with both I/F. But SPI is preferred.

RTC is not required, because my system has one already. (SII S35180A, consumes very low power.) (

)

I want SRAM+EEPROM type, not SRAM+coin cell battery. Because small package is also required.

After I made a net search, X24C45 seems meet my requirements, but its supply voltage is too high, 3.3V is default power in my system. And I can't find it on Xicor's web site. This chip should be discontinued.

Well, I might modify my design if no proper NVRAM is found.

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Go to Digikey and type "serial EEPROM" into their search box. It gets several thousand hits.

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