FM24C256_05 RAMTRON [Ramtron International Corporation], FM24C256_05 Datasheet

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FM24C256_05

Manufacturer Part Number
FM24C256_05
Description
256Kb FRAM Serial Memory
Manufacturer
RAMTRON [Ramtron International Corporation]
Datasheet
FM24C256
256Kb FRAM Serial Memory
Features
256Kbit Ferroelectric Nonvolatile RAM
Fast Two-wire Serial Interface
Description
The FM24C256 is a 256-kilobit nonvolatile memory
employing an advanced ferroelectric process. A
ferroelectric random access memory or FRAM is
nonvolatile and performs reads and writes like a
RAM. It provides reliable data retention for 45 years
while eliminating the complexities, overhead, and
system
EEPROM and other nonvolatile memories.
The FM24C256 performs write operations at bus
speed. No write delays are incurred. The next bus
cycle may commence immediately without the need
for data polling. In addition, the product offers write
endurance
EEPROM. Also, FRAM exhibits much lower power
during writes than EEPROM since write operations
do not require an internally elevated power supply
voltage for write circuits.
These capabilities make the FM24C256 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
combination of features allows more frequent data
writing with less overhead for the system.
The FM24C256 is available in a 8-pin EIAJ SOIC
package using an industry standard two-wire
protocol. Specifications are guaranteed over an
industrial temperature range of -40°C to +85°C.
This product conforms specifications per the terms of the Ramtron
standard warranty. The product has completed Ramtron’s internal
qualification testing and has reached production status.
Rev 3.1
May 2005
Organized as 32,768 x 8 bits
High Endurance 10 Billion (10
45 year Data Retention
NoDelay™ Writes
Advanced High-Reliability Ferroelectric Process
Up to 1 MHz Maximum Bus Frequency
Supports Legacy Timing for 100 kHz & 400 kHz
level
orders
reliability
of
magnitude
problems
10
) Read/Writes
higher
caused
than
by
NOTE: Top side part marking is “FM24C256-S”
whereas “FM24C256-SE” is used only for ordering.
Low Power Operation
Industry Standard Configuration
Pin Configuration
Pin Names
A0-A2
SDA
SCL
WP
VSS
VDD
Ordering Information
FM24C256-SE
FM24C256-G
5V Operation
200 A Active Current (100 kHz)
100 A Standby Current
Industrial Temperature -40 C to +85 C
8-pin EIAJ SOIC
“Green” Packaging Option
VSS
A0
A1
A2
1850 Ramtron Drive, Colorado Springs, CO 80921
Function
Device Select Address
Serial Data/Address
Serial Clock
Write Protect
Ground
Supply Voltage 5V
8-pin EIAJ SOIC
“Green” 8-pin EIAJ SOIC
1
2
3
4
Ramtron International Corporation
(800) 545-FRAM, (719) 481-7000
8
7
6
5
www.ramtron.com
VDD
WP
SCL
SDA
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FM24C256_05 Summary of contents

Page 1

FM24C256 256Kb FRAM Serial Memory Features 256Kbit Ferroelectric Nonvolatile RAM Organized as 32,768 x 8 bits 10 High Endurance 10 Billion (10 45 year Data Retention NoDelay™ Writes Advanced High-Reliability Ferroelectric Process Fast Two-wire Serial Interface MHz ...

Page 2

Counter ` SDA Serial to Parallel Converter SCL WP Control Logic A0-A2 Pin Description Pin Name Type Pin Description A0-A2 Input Address 2-0: These pins are used to select one devices of the same type on ...

Page 3

Overview The FM24C256 is a serial FRAM memory. The memory array is logically organized as 32,768 x 8 bit memory array and is accessed using an industry standard two-wire interface. Functional operation of the FRAM is similar to serial EEPROMs. ...

Page 4

Stop Start (Master) (Master) Stop Condition A Stop condition is indicated when the bus master drives SDA from low to high while the SCL signal is high. All operations using the FM24C256 must end with a Stop condition ...

Page 5

Addressing Overview After the FM24C256 (as receiver) acknowledges the device address, the master can place the memory address on the bus for a write operation. The address requires two bytes. The first is the MSB (upper byte). Since the device ...

Page 6

Start By Master S Slave Address 0 By FM24C256 Start By Master X S Slave Address FM24C256 Read Operation There are two types of read operations. They are current address read and selective address read ...

Page 7

Start By Master By FM24C256 Start Address By Master S Slave Address By FM24C256 Start Address By Master S Slave Address 0 A Address MSB By FM24C256 Endurance A FRAM internally operates with a read and restore mechanism. Therefore, endurance ...

Page 8

Electrical Specifications Absolute Maximum Ratings Symbol V Voltage Voltage on any signal pin with respect Storage Temperature STG T Lead temperature (Soldering, 10 seconds) LEAD V Electrostatic Discharge Voltage ESD - Human ...

Page 9

AC Parameters ( Symbol Parameter f SCL Clock Frequency SCL t Clock Low Period LOW t Clock High Period HIGH t SCL Low to SDA Data Out Valid AA t Bus ...

Page 10

Diagram Notes All start and stop timing parameters apply to both read and write cycles. Clock specifications are identical for read and write cycles. Write timing parameters apply to slave address, word address, and write data bits. Functional relationships are ...

Page 11

Mechanical Drawing 8-pin EIAJ SOIC Pin 1 5.23 0.10 ± 1.27 0.36 0.50 All dimensions in millimeters. EIAJ SOIC Package Marking Scheme Legend: XXXXXX= part number LLLLLLL= lot code RIC=Ramtron Int’l Corp, YY=year, WW=work week XXXXXXX-G LLLLLLL FM24C256, “Green” EIAJ ...

Page 12

Revision History Revision Date 1.0 4/10/01 1.1 9/28/01 1.2 1/31/02 1.3 2/3/04 3.0 2/16/05 3.1 5/5/05 Rev 3.1 May 2005 Summary Initial Release Changed Idd and Isb specifications. Changed test load to 1700 ohms to reflect 3mA V test condition. ...

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