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FM1808B fiches techniques PDF

Ramtron - 256Kb Bytewide 5V F-RAM Memory

Numéro de référence FM1808B
Description 256Kb Bytewide 5V F-RAM Memory
Fabricant Ramtron 
Logo Ramtron 





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FM1808B fiche technique
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Preliminary
FM1808B
256Kb Bytewide 5V F-RAM Memory
Features
256Kbit Ferroelectric Nonvolatile RAM
Organized as 32,768 x 8 bits
High Endurance 1 Trillion (1012) Read/Writes
38 year Data Retention (@ +75°C)
NoDelay™ Writes
Advanced High-Reliability Ferroelectric Process
Superior to BBSRAM Modules
No Battery Concerns
Monolithic Reliability
True Surface Mount Solution, No Rework Steps
Superior for Moisture, Shock, and Vibration
Resistant to Negative Voltage Undershoots
SRAM & EEPROM Compatible
JEDEC 32Kx8 SRAM & EEPROM pinout
70 ns Access Time
130 ns Cycle Time
Low Power Operation
15 mA Active Current
25 µA (typ.) Standby Current
Industry Standard Configuration
Industrial Temperature -40°C to +85°C
28-pin “Green”/RoHS SOIC Package
Description
The FM1808B is a 256-kilobit nonvolatile memory
employing an advanced ferroelectric process. A
ferroelectric random access memory or F-RAM is
nonvolatile but operates in other respects as a RAM.
It provides data retention for 38 years while
eliminating the reliability concerns, functional
disadvantages and system design complexities of
battery-backed SRAM (BBSRAM). Fast write timing
and high write endurance make F-RAM superior to
other types of nonvolatile memory.
In-system operation of the FM1808B is very similar
to other RAM devices. Minimum read- and write-
cycle times are equal. The F-RAM memory, however,
is nonvolatile due to its unique ferroelectric memory
process. Unlike BBSRAM, the FM1808B is a truly
monolithic nonvolatile memory. It provides the same
functional benefits of a fast write without the
disadvantages associated with modules and batteries
or hybrid memory solutions.
These capabilities make the FM1808B ideal for
nonvolatile memory applications requiring frequent
or rapid writes in a bytewide environment. The
availability of a true surface-mount package improves
the manufacturability of new designs. Device
specifications are guaranteed over an industrial
temperature range of -40°C to +85°C.
Pin Configuration
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VDD
27 WE
26 A13
25 A8
24 A9
23 A11
22 OE
21 A10
20 CE
19 DQ7
18 DQ6
17 DQ5
16 DQ4
15 DQ3
Ordering Information
FM1808B-SG
28-pin “Green”/RoHS SOIC
This is a product that has fixed target specifications but are subject
to change pending characterization results.
Rev. 1.2
Mar. 2011
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
http://www.ramtron.com
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