FM25CL64 datasheet(8/13 Pages) RAMTRON

8 / 13 page

FM25CL64

Rev. 2.1

Apr. 2003

Page 8 of 13

345

4567

345

op-code

MSB

13-bit Address

12 11 10

210

765

LSB MSB

LSB

SCK

Data

Figure 9. Memory Write

34567

567

34567

op-code

MSB

13-bit Address

12 11 10

210

54321

LSB MSB

LSB

SCK

Data

Figure 10. Memory Read

Applications

The versatility of FRAM technology fits into many

diverse applications. The strength of higher write

endurance and faster writes make FRAM superior to

EEPROM

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.

Data collection. In applications that collect and

save data, 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.

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.

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

corrupted. The fast write of FRAM is complete

within a microsecond. This time is typically too short

for noise or power fluctuations to disturb it.

Time to market. In a complex system, multiple

software routines may need to access the nonvolatile

memory.

this

environment

the

time

delay

associated

with

programming

EEPROM

adds

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 FM25CL64, it is effectively done -- no

waiting.

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 FM25CL64 is

suitable for multi-chip RF/ID products.

Maintenance tracking. In sophisticated systems,

the operating history and system-state during a failure

important

knowledge.

Maintenance

can

expedited when this information has been recorded.

Due to the high write endurance, FRAM makes an

ideal system log. In addition, the convenient interface

of the FM25CL64 allows memory to be distributed

throughout the system using minimal additional

resources.

FM25CL64 датащи(PDF) 8 Page - Ramtron International Corporation

FM25CL64 датащи(HTML) 8 Page - Ramtron International Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13

датащи скачать

ссылки URL