Meaning of P25C256F SPI EEPROM "write time"?

[Pje]

Hi All,

I want to ask a general question regarding EEPROM with SPI Interface,

I am not sure if I understand the Datasheet correctly however it mentions that I can clock in 64 bytes (with the CS line pulled Low) then it mention the EEPROM has a write time of aprox 5mSec my confusion  is this  5mSec write time after I pulled the CS High which is after the last byte .

In general do I clock in the 64 bytes then pull the CS high and then the EEPROM writes the Data or should I keep the CS low for 5mSec after the last byte before pulling it high again .

At the moment I Pull CS High after the last byte and wait approx 6mSec ,I see all the data I write on my LA and when I read they are resonably in the expected positions (addresses ) however ther are a problem in 2 pages with wong values in the addresses although the write data log on the LA show that the bytes are written corrcetly and the page addreses are also  correct,

I appreciate any hints or help as allways.

it is P25C256F EEPROM 

Regards Pje

[Andrew Neil]

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@Pje wrote:

I am not sure if I understand the Datasheet correctly

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You need to take that up with the manufacturer to confirm what, specifically, they mean!

It's not an ST part - is it?

Is it the same as this one https://community.st.com/t5/stm32-mcus-products/eeprom-help-needed/td-p/740205 ?

[Mike_ST]

Hello,

It is not our product, but:

in the V1.3 datasheet page 19 (look for "tW" token):

"Driving the Chip Select (S#) signal high at a byte boundary of the input data triggers the self-timed Write cycle
that takes tW to complete (as specified in AC tables in: DC and AC parameters)."