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MR25H256
FEATURES
? No write delays
? Unlimited write endurance
? Data retention greater than 20 years
? Automatic data protection on power loss
? Block write protection
? Fast, simple SPI interface with up to 40 MHz clock rate
? 2.7 to 3.6 Volt power supply range
? Low current sleep mode
? Industrial temperatures
? Available in 8-pin DFN or 8-pin DFN Small Flag RoHS-compliant pack-
ages.
? Direct replacement for serial EEPROM, Flash, FeRAM
? AEC-Q100 Grade 1 option
256Kb Serial SPI MRAM
DFN
Small Flag DFN
RoHS
INTRODUCTION
The MR25H256 is a 262,144-bit magnetoresistive random access memory (MRAM) device orga-
nized as 32,768 words of 8 bits. The MR25H256 offers serial EEPROM and serial
Flash compatible read/write timing with no write delays and unlimited read/write
endurance.
Unlike other serial memories, both reads and writes can occur randomly in memo-
ry with no delay between writes. The MR25H256 is the ideal memory solution for applications that must
store and retrieve data and programs quickly using a small number of I/O pins.
The MR25H256 is available in either a 5 mm x 6 mm 8-pin DFN package or a 5 mm x 6 mm 8-pin DFN
Small Flag package. Both are compatible with serial EEPROM, Flash, and FeRAM products.
The MR25H256 provides highly reliable data storage over a wide range of temperatures. The product is
offered with industrial (-40° to +85 °C) and AEC-Q100 Grade 1 (-40°C to +125 °C) operating temperature
range options.
CONTENTS
1. DEVICE PIN ASSIGNMENT......................................................................... 3
2. SPI COMMUNICATIONS PROTOCOL...................................................... 4
3. ELECTRICAL SPECIFICATIONS................................................................. 10
4. TIMING SPECIFICATIONS.......................................................................... 14
5. ORDERING INFORMATION....................................................................... 16
6. MECHANICAL DRAWING.......................................................................... 17
7. REVISION HISTORY...................................................................................... 18
How to Reach Us.......................................................................................... 18
Copyright ? Everspin Technologies 2013
1
MR25H256 Rev. 9, 4/2013
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