FM1808
256Kb Bytewide FRAM Memory
Features
256Kbit Ferroelectric Nonvolatile RAM
• Organized as 32,768 x 8 bits
• High Endurance 10 Billion (1010) Read/Writes
• 10 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
Description
The FM1808 is a 256-kilobit nonvolatile memory
employing an advanced ferroelectric process. A
ferroelectric random access memory or FRAM is
nonvolatile but operates in other respects as a RAM.
It provides data retention for 10 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 FRAM 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 FRAM 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.
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. 3.0
Nov. 2004
SRAM & EEPROM Compatible
• JEDEC 32Kx8 SRAM & EEPROM pinout
• 70 ns Access Time
• 130 ns Cycle Time
Low Power Operation
• 25 mA Active Current
• 20 µA Standby Current
Industry Standard Configuration
• Industrial Temperature -40° C to +85° C
• 28-pin SOIC or DIP
• “Green” Packaging Options
Pin Configuration
A14
1
28
VDD
A12
2
27
WE
A7
3
26
A13
A6
4
25
A8
A5
5
24
A9
A4
6
23
A11
A3
7
22
OE
A2
8
21
A10
A1
9
20
CE
A0
10
19
DQ7
DQ0
11
18
DQ6
DQ1
12
17
DQ5
DQ2
13
16
DQ4
VSS
14
15
DQ3
Ordering Information
FM1808-70-P
70 ns access, 28-pin plastic DIP
FM1808-70-S
70 ns access, 28-pin SOIC
FM1808-70-PG 70 ns access, 28-pin “Green” DIP
FM1808-70-SG 70 ns access, 28-pin “Green” SOIC
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000, Fax (719) 481-7058
www.ramtron.com
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