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Parallel F-RAM Memory FM1808 - Ramtron


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FM1808
256Kb Bytewide F-RAM Memory
r
Features
256Kbit Ferroelectric Nonvolatile RAM
• Organized as 32,768 x 8 bits
• High Endurance 1 Trillion (1012) Read/Writes
• 45 year Data Retention
• 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
• 25 mA Active Current
• 20 |jA Standby Current
Industry Standard Configuration
• Industrial Temperature -40° C to +85° C
• 28-pin SOIC or DIP
• "Green"/RoHS Packaging
Description
The FM1808 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 45 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 FM1808 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 FM1808 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 FM1808 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, while the DIP package facilitates simple design retrofits. Device specifications are guaranteed over an industrial temperature range of -40°C to +85°C.
Pin Configuration
a14
Z
1
28
Z
vdd
a12
Z
2
27
z
we
a7
z
3
26
z
a13
a6
z
4
25
z
a8
a5
z
5
24
z
a9
a4
z
CD
23
z
a11
a3
z
7
22
z
oE
a2
z
21
z
a10
a1
z
9
20
z
ce
a0
z
10
19
z
dq7
dq0
z
11
18
z
dq6
dq1
z
12
17
z
dq5
dq2
z
13
16
z
dq4
vss
z
14
15
z
dq3
_Ordering Information_
FM1808-70-PG I 70 ns access, 28-pin "Green" DIP~ FM1808-70-SG 70 ns access, 28-pin "Green" SOIC
This product conforms to specifications per the terms of the Ramtron standard warranty. The product has completed Ramtron's internal qualification testing and has reached production status.
Rev. 3.4 Dec. 2007
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921 (800) 545-FRAM, (719) 481-7000 http ://www.ramtron. com
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pageCatalog pdf di En 2012-02-07-15