The Read and Write time for Ramtron 24C404 ??

[arunb]

Hi,

What would be the read/write time for the Ramtron 24C404.

thanks
arunb

[Ttelmah]

No such chip.
Do you mean the 24C04, or the 24CL04?.
It is limited by the speed the data can be clocked across the interface, rather than any internal 'write time'. If the data bus is clocked at 1MHz, it takes eight clock cycles to transfer a byte, plus one for the acknowledge. Reading, data is available 0.55uSec after the last bit of the address is sent. Basically you can transfer about 100Kbytes/second, if the chip controlling the I2C bus can clock this fast.

Best Wishes

[arunb]

Hi,

Sorry that was 24C04 the flash Ram.

The write time for 24LC256 is quite high , so the FRAM should be faster.

Another question, will continously reading & writing to the RAM reduce the life of the IC ??

Suppose I put the read and write sequence in a continous Do Loop , do you think the FRAN wil get damaged quickly ???



thanks
arunb

[treitmey]

I don't know what your clock speed is so I'll just say this.
From FM24C256ds_r1.3.pdf
--quote--
256Kbit Ferroelectric Nonvolatile RAM
• Organized as 32,768 x 8 bits
• High Endurance 10 Billion (1010) Read/Writes
• 45 year Data Retention
• NoDelay™ Writes
• Advanced High-Reliability Ferroelectric Process
--quote--
Regardless, FRAM read and
write endurance is effectively unlimited at the 1MHz
two-wire speed. Even at 30 accesses per second to
the same segment, 10 years time will elapse before
10 billion endurance cycles occur.