FM24C256-GTR Ramtron, FM24C256-GTR Datasheet

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FM24C256-GTR

Manufacturer Part Number
FM24C256-GTR
Description
fm24c256 series 256 k-bit (32k x 8) 5 v 3 us serial...
Manufacturer
Ramtron
Datasheet

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Part Number
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Part Number:
FM24C256-GTR
Manufacturer:
RAMTRON
Quantity:
20 000
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
Page 1of 12

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FM24C256-GTR Summary of contents

Page 1

... 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. ...

Page 2

... SCL falling edge, and clocked in on the SCL rising edge. The SCL input also incorporates a Schmitt trigger input for improved noise immunity. VDD Supply Supply Voltage: 5V VSS Supply Ground Rev 3.1 May 2005 Address Latch Figure 1. Block Diagram FM24C256 4,096 x 64 FRAM Array 8 Data Latch Page ...

Page 3

... This is explained in more detail in the interface section below. Users can expect several obvious system benefits from the FM24C256 due to its fast write cycle and high endurance as compared with EEPROM. However there are less obvious benefits as well. For example in a high noise environment, the fast-write operation is less susceptible to corruption than an EEPROM since the write cycle is completed quickly ...

Page 4

... Bits 7-4 define the device type and must be set to 1010b for the FM24C256. These bits allow other types of function types to reside on the 2-wire bus within an identical address range. Bits 3-1 are the device select bits which are equivalent to chip select bits ...

Page 5

... After the address information has been transmitted, data transfer between the bus master and the FM24C256 can begin. For a read operation the FM24C256 will place 8 data bits on the bus then wait for an Acknowledge from the master. If the Acknowledge occurs, the FM24C256 will transfer the next sequential byte ...

Page 6

... After each byte, the internal address counter will be incremented. Each time the bus master acknowledges a byte, this indicates that the FM24C256 should read out the next sequential byte. There are four ways to properly terminate a read operation. Failing to properly terminate the read will Rev 3 ...

Page 7

... Therefore, endurance cycles are applied for each read and write access. The FRAM architecture is based on an array of rows and columns. Rows (A14-A6) are subdivided into 8 segments (A5-A3). Each access causes an endurance cycle for a row segment. In the FM24C256, there are Rev 3.1 May 2005 Address S ...

Page 8

... Std JESD22-A114-B) (JEDEC Std JESD22-A115-A) = 4.5V to 5.5V unless otherwise specified) DD Min Typ 4.5 5 other inputs -0. Stop command issued. DD FM24C256 Ratings -1.0V to +7.0V -1.0V to +7.0V and V < V +1. - 125 C 300 C 4kV 400V MSL-1 Max Units Notes 5 200 A 500 A 1 ...

Page 9

... Min 0 100 0 4.7 1.3 4.0 0.6 3 4.7 1.3 4.0 0.6 4.7 0 250 100 1000 300 4.0 0 5V) DD Max Units FM24C256 Max Min Max Units Notes 400 0 1000 kHz 0.6 s 0.4 s 0.9 0.55 s 0.5 s 0. 100 ns 300 300 ns 1 300 100 ...

Page 10

... Start Data Retention (V = 4.5V to 5.5V, + Parameter Data Retention Rev 3.1 May 2005 t HIGH 1/fSCL t AA Stop Start t HD:DAT t t SU:DAT HD:STA Stop Start Min Units 45 Years FM24C256 LOW SP t HD:DAT t SU:DAT t DH Acknowledge t AA Acknowledge Notes Page ...

Page 11

... 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 SOIC package, Year 2004, Work Week 50 RIC YYWW FM24C256-G A40003S1 RIC 0450 FM24C256, Standard EIAJ SOIC package (-SE) RIC ...

Page 12

... Added “part marking” note to Ordering Information (pg 1). Added “green” packaging option. Added ESD and package MSL ratings. Changed storage temperature. New rev. number and 1 with updated scheme. Changed Data Retention spec. Clarified Package Marking Scheme text and drawings. FM24C256 st page footer to comply Page ...

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