FM24C04A_05 RAMTRON [Ramtron International Corporation], FM24C04A_05 Datasheet - Page 7

• Manufacturer Part Number: FM24C04A_05
• Description: 4Kb FRAM Serial Memory
• Manufacturer: RAMTRON [Ramtron International Corporation]

Endurance
Internally, a FRAM operates with a read and restore
mechanism. Therefore, endurance cycles are applied
for each read or write cycle. The FRAM architecture
is based on an array of rows and columns. Rows are
Rev. 3.0
Mar. 2005
By FM24C04A
By FM24C04A
By Master
By Master
Start
S
By FM24C04A
By Master
Slave Address
Start
S
Slave Address
0
Address
Address
Start
A
S
Word Address
Slave Address
Acknowledge
Figure 9. Selective (Random) Read
Figure 7. Current Address Read
1
Address
Figure 8. Sequential Read
A
Acknowledge
A
Acknowledge
Start
S
Data Byte
1
A
Slave Address
Address
defined by A8-A2. Each access causes an endurance
cycle for a row. Endurance is virtually unlimited. At
3000 accesses per second to the same segment, it will
take more than 10 years to reach the endurance limit.
Acknowledge
Data Byte
Data
A
1
Data
A
Acknowledge
Data Byte
Data Byte
No
1
P
Acknowledge
Acknowledge
Data
A
No
1 P
Stop
Data Byte
FM24C04A
Acknowledge
Stop
No
7 of 12
1 P
Stop