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FM1808 データシート(PDF) 1 Page - List of Unclassifed Manufacturers

部品番号 FM1808
部品情報  256Kb Bytewide FRAM Memory
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Preliminary
This data sheet contains design specifications for product development.
Ramtron International Corporation
These specifications may change in any manner without notice.
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000, Fax (719) 481-7058
www.ramtron.com
27 July 2000
1/12
FM1808
256Kb Bytewide FRAM Memory
Features
256K bit Ferroelectric Nonvolatile RAM
Organized as 32,768 x 8 bits
High endurance 10 Billion (10
10) read/writes
10 year data retention at 85
° C
NoDelay™ write
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
Equal access & cycle time for reads and writes
Low Power Operation
25 mA active current
20
µA standby current
Industry Standard Configuration
Industrial temperature -40
° C to +85° C
28-pin SOP or DIP
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. It’s fast write and high write
endurance makes it superior to other types of
nonvolatile memory.
In-system operation of the FM1808 is very similar to
other RAM based devices. Memory read- and write-
cycles require equal times. 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
serious 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. The
FM1808
offers
guaranteed
operation
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
DQ3
DQ4
DQ5
DQ6
DQ7
CE
A10
OE
A11
A9
A8
A13
WE
VDD
Ordering Information
FM1808-70-P
70 ns access, 28-pin plastic DIP
FM1808-70-S
70 ns access, 28-pin SOP
FM1808-120-P
120 ns access, 28-pin plastic DIP
FM1808-120-S
120 ns access, 28-pin SOP


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