900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






Ramtron

FM25640C Datasheet Preview

FM25640C Datasheet

5V F-RAM Memory

No Preview Available !

www.DataSheet.co.kr
Preliminary
FM25640C
64Kb Serial 5V F-RAM Memory
Features
64K bit Ferroelectric Nonvolatile RAM
Organized as 8,192 x 8 bits
High Endurance 1 Trillion (1012) Read/Writes
36 Year Data Retention at +75C
NoDelay™ Writes
Advanced high-reliability ferroelectric process
Very Fast Serial Peripheral Interface - SPI
Up to 20 MHz maximum bus frequency
Direct hardware replacement for EEPROM
SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1)
Description
The FM25640C is a 64-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 reliable data retention for 36 years while
eliminating the complexities, overhead, and system
level reliability problems caused by EEPROM and
other nonvolatile memories.
The FM25640C performs write operations at bus
speed. No write delays are incurred. Data is written to
the memory array immediately after it has been
successfully transferred to the device. The next bus
cycle may commence immediately without the need
for data polling. The FM25640C is capable of
supporting up to 1012 read/write cycles, or a million
times more write cycles than EEPROM.
These capabilities make the FM25640C ideal for
nonvolatile memory applications requiring frequent
or rapid writes. Examples range from data collection,
where the number of write cycles may be critical, to
demanding industrial controls where the long write
time of EEPROM can cause data loss.
The FM25640C provides substantial benefits to users
of serial EEPROM, in a hardware drop-in
replacement. The FM25640C uses the high-speed SPI
bus, which enhances the high-speed write capability
of F-RAM technology. The specifications are
guaranteed over an industrial temperature range of
-40°C to +85°C.
Sophisticated Write Protection Scheme
Hardware Protection
Software Protection
Low Power Consumption
250 A Active Current (1 MHz)
4 A (typ.) Standby Current
Industry Standard Configuration
Industrial Temperature -40C to +85C
8-pin “Green”/RoHS SOIC (-G)
Pin Configuration
CS
SO
WP
VSS
1
2
3
4
8 VDD
7 HOLD
6 SCK
5 SI
Pin Names
/CS
/HOLD
/WP
SCK
SI
SO
VDD
VSS
Function
Chip Select
Hold
Write Protect
Serial Clock
Serial Data Input
Serial Data Output
5V
Ground
Ordering Information
FM25640C-G
“Green”/RoHS 8-pin SOIC
FM25640C-GTR “Green”/RoHS 8-pin SOIC,
Tape & Reel
This is a product that has fixed target specifications but are subject
to change pending characterization results.
Rev. 1.1
June 2011
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-F-RAM, (719) 481-7000
www.ramtron.com
Page 1 of 13
Datasheet pdf - http://www.DataSheet4U.net/




Ramtron

FM25640C Datasheet Preview

FM25640C Datasheet

5V F-RAM Memory

No Preview Available !

www.DataSheet.co.kr
FM25640C - 64Kb 5V SPI F-RAM
WP
CS
HOLD
SCK
Instruction Decode
Clock Generator
Control Logic
Write Protect
Instruction Register
Address Register
Counter
13
1,024 x 64
FRAM Array
8
Data I/O Register
3
Nonvolatile Status
Register
SO
Figure 1. Block Diagram
Pin Description
Pin Name I/O
/CS Input
SCK
/HOLD
/WP
Input
Input
Input
SI Input
SO Output
VDD
VSS
Supply
Supply
Pin Description
Chip Select: Enables and disables the device. When /CS is high, the output pin SO is hi-
Z, all other inputs are ignored, and the device remains in a low-power standby mode.
When /CS is low, the part will respond to the SCK signal. A falling edge on /CS must
occur for every op-code.
Serial Clock: All I/O activity is synchronized to the serial clock. Inputs are latched on the
rising edge and outputs occur on the falling edge. The device is static so the clock
frequency may be any value between 0 and 20 MHz and may be interrupted at any time.
Hold: The /HOLD signal is used when the host CPU must interrupt a memory operation
for another task. Asserting the /HOLD signal low pauses the current operation. The
device ignores SCK and /CS. All transitions on /HOLD must occur while SCK is low.
Write Protect: This pin prevents write operations to the status register. This is critical
since other write protection features are controlled through the status register. A
complete explanation of write protection is provided below. *Note that the function of
/WP is different from the FM25040 where it prevents all writes to the part.
Serial Input: SI is the data input pin. It is sampled on the rising edge of SCK and is
ignored otherwise. It should always be driven to a valid logic level to meet IDD
specifications.
* SI may be connected to SO for a single pin data interface.
Serial Output: SO is the data output pin. It is driven during read cycles and remains hi-Z
at all other times including when HOLD\ is low. Data transitions are driven on the falling
edge of the serial clock.
* SO can be connected to SI for a single pin data interface since the part communicates
in half-duplex.
Supply Voltage: 5V
Ground
Rev. 1.1
June 2011
2 of 13
Datasheet pdf - http://www.DataSheet4U.net/


Part Number FM25640C
Description 5V F-RAM Memory
Maker Ramtron
PDF Download

FM25640C Datasheet PDF






Similar Datasheet

1 FM25640 64Kb FRAM Serial Memory
ETC
2 FM25640-S 64Kb FRAM Serial Memory
ETC
3 FM25640B 64-Kbit (8 K x 8) Serial (SPI) Automotive F-RAM
Cypress Semiconductor
4 FM25640B 5V F-RAM Memory
Ramtron
5 FM25640C 5V F-RAM Memory
Ramtron





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy