FM1808 Datasheet, PDF (1/12 Pages) List of Unclassifed Manufacturers – 256Kb Bytewide FRAM Memory

Preliminary
FM1808
256Kb Bytewide FRAM Memory
Features
256K bit Ferroelectric Nonvolatile RAM
• Organized as 32,768 x 8 bits
• High endurance 10 Billion (10¹⁰) 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
VDD
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
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
This data sheet contains design specifications for product development.
These specifications may change in any manner without notice.
27 July 2000
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, [phone], Fax [phone]
www.ramtron.com
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