FM24C04C-G RAMTRON [Ramtron International Corporation], FM24C04C-G Datasheet - Page 7

• Manufacturer Part Number: FM24C04C-G
• Description: 4Kb Serial 5V F-RAM Memory
• Manufacturer: RAMTRON [Ramtron International Corporation]

Endurance
The FM24C04C internally operates with a read and
restore mechanism. Therefore, endurance cycles are
applied for each read or write cycle. The memory
architecture is based on an array of rows and
columns. Each read or write access causes an
endurance cycle for an entire row. In the FM24C04C,
a row is 64 bits wide. Every 8-byte boundary marks
Rev. 1.1
June 2011
By Master
By F-RAM
By Master
By F-RAM
Start
S
By Master
By F-RAM
Slave Address
Start
S
Slave Address
0
Address
Start
A
Address
S
Word Address
Slave Address
Figure 9. Selective (Random) Read
Acknowledge
Figure 7. Current Address Read
Address
1
Figure 8. Sequential Read
A
Acknowledge
A
Start
Acknowledge
S
1
Data Byte
A
Slave Address
Address
the beginning of a new row. Endurance can be
optimized by ensuring frequently accessed data is
located in different rows. Regardless, F-RAM read
and write endurance is effectively unlimited at the
1MHz two-wire speed. Even at 3000 accesses per
second to the same row, 10 years time will elapse
before 1 trillion endurance cycles occur.
Acknowledge
Data Byte
Data
1
A
Data
A
Acknowledge
Data Byte
Data Byte
No
1
P
Acknowledge
Acknowledge
Data
A
No
1 P
Stop
Data Byte
FM24C04C
Acknowledge
Stop
Page 7 of 12
No
1 P
Stop