time to write to eeprom

William50

I will be sending large files to the eeprom (30k-50k each) to later be parsed and sent out again.

I need to know exactly how long it takes the prop write a bit to eeprom?

Is the time to read from eeprom the same as the time to write?

Mike Green

Reading and writing speeds depend on whether you use block transfers or a byte at a time since there's some overhead for an EEPROM transaction. The larger EEPROMs support blocks (pages) of 128 or 256 bytes depending on the EEPROM size and manufacturer. The clock speed used is about 100KHz which comes out to roughly 10KBytes/second. There's a 3 byte overhead for writing and a 4 byte overhead for reading. There's also an approximately 5ms write cycle time after the transfer is complete before the EEPROM will respond to the next operation. For reading, there's only the transfer (and overhead) time.