FM24CL04 查看數據表（PDF） - Unspecified

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FM24CL04

4Kb FRAM Serial Memory

Unspecified 

Applications

The versatility of FRAM technology fits into many

diverse applications. Clearly the strength of higher

write endurance and faster writes make FRAM

superior to EEPROM in all but one-time

programmable applications. The advantage is most

obvious in data collection environments where writes

are frequent and data must be nonvolatile.

The attributes of fast writes and high write endurance

combine in many innovative ways. A short list of

ideas is provided here.

1. Data collection. In applications where data is

collected and saved, FRAM provides a superior

alternative to other solutions. It is more cost effective

than battery backup for SRAM and provides better

write attributes than EEPROM.

2. Configuration. Any nonvolatile memory can

retain a configuration. However if the configuration

changes and power failure is a possibility, the higher

write endurance of FRAM allows changes to be

recorded without restriction. Any time the system

state is altered, the change can be written. This avoids

writing to memory on power down when the available

time is short and power scarce.

3. High noise environments. Writing to EEPROM

in a noisy environment can be challenging. When

severe noise or power fluctuations are present, the

long write time of EEPROM creates a window of

vulnerability during which the write can be corrupted.

The fast write of FRAM is completed within a

microsecond. This time is typically too short for noise

or power fluctuation to disturb it.

FM24CL04

4. Time to market. In a complex system, multiple

software routines may need to access the nonvolatile

memory. In this environment the time delay

associated with programming EEPROM adds undue

complexity to the software development. Each

software routine must wait for complete programming

before allowing access to the next routine. When time

to market is critical, FRAM can eliminate this simple

obstacle. As soon as a write is issued to the

FM24CL04, it is effectively done -- no waiting.

5. RF/ID. In the area of contactless memory, FRAM

provides an ideal solution. Since RF/ID memory is

powered by an RF field, the long programming time

and high current consumption needed to write

EEPROM is unattractive. FRAM provides a superior

solution. The FM24CL04 is suitable for multi-chip

RF/ID products.

6. Maintenance tracking. In sophisticated systems,

the operating history and system state during a failure

is important knowledge. Maintenance can be

expedited when this information has been recorded.

Due to the high write endurance, FRAM makes an

ideal system log. In addition, the convenient 2-wire

interface of the FM24CL04 allows memory to be

distributed throughout the system using minimal

additional resources.

Rev. 2.0

July 2003

Page 8 of 12

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