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Ramtron

FM1808B Datasheet Preview

FM1808B Datasheet

256Kb Bytewide 5V F-RAM Memory

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www.DataSheet.co.kr
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
Page 1 of 11
Datasheet pdf - http://www.DataSheet4U.net/




Ramtron

FM1808B Datasheet Preview

FM1808B Datasheet

256Kb Bytewide 5V F-RAM Memory

No Preview Available !

www.DataSheet.co.kr
FM1808B – 256Kb Bytewide 5V F-RAM
A0-A14
CE
Address
Latch &
Decoder
A0-A14
32,768 x 8 FRAM Array
WE
Control
Logic
OE
I/O Latch
Bus Driver
DQ0-7
Figure 1. Block Diagram
Pin Description
Pin Name
A(14:0)
DQ(7:0)
/CE
/OE
/WE
VDD
VSS
Type
Input
I/O
Input
Input
Input
Supply
Supply
Description
Address: The 15 address lines select one of 32,768 bytes in the F-RAM array. The
address value is latched on the falling edge of /CE.
Data: 8-bit bi-directional data bus for accessing the F-RAM array.
Chip Enable: /CE selects the device when low. Asserting /CE low causes the
address to be latched internally. Address changes that occur after /CE goes low
will be ignored until the next falling edge occurs.
Output Enable: Asserting /OE low causes the FM1808B to drive the data bus when
valid data is available. Deasserting /OE high causes the DQ pins to be tri-stated.
Write Enable: Asserting /WE low causes the FM1808B to write the contents of the
data bus to the address location latched by the falling edge of /CE.
Supply Voltage: 5V
Ground
Functional Truth Table
/CE /WE Function
H X Standby/Precharge
X Latch Address (and Begin Write if /WE=low)
L H Read
L Write
Note: The /OE pin controls only the DQ output buffers.
Rev. 1.2
Mar. 2011
Page 2 of 11
Datasheet pdf - http://www.DataSheet4U.net/


Part Number FM1808B
Description 256Kb Bytewide 5V F-RAM Memory
Maker Ramtron
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FM1808B Datasheet PDF






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