MR256A08B
MR256A08B Rev. 6.5 3/2018
1
Copyright © 2018 Everspin Technologies
32K x 8 MRAM
The MR256A08B is a 262,144-bit magnetoresistive random access
memory (MRAM) device organized as 32,768 words of 8 bits. The
MR256A08B oers SRAM compatible 35ns read/write timing with un-
limited endurance.
Data is always non-volatile for greater than 20-years. Data is automatically protected on
power loss by low-voltage inhibit circuitry to prevent writes with voltage out of specication.
The MR256A08B is the ideal memory solution for applications that must permanently store
and retrieve critical data and programs quickly.
The MR256A08B is available in a small footprint 400-mil, 44-lead plastic small-outline TSOP
type-2 package, or an 8 mm x 8 mm, 48-pin ball grid array (BGA) package. (The 32-SOIC
package options is obsolete and no longer available for new orders.) All package footprints
are compatible with similar low-power SRAM products and other non-volatile RAM products.
The MR256A08B provides highly reliable data storage over a wide range of temperatures.
The product is oered with commercial temperature (0 to +70 °C) and industrial temperature
(-40 to +85 °C) range options.
FEATURES
BENEFITS
• One memory replaces FLASH, SRAM, EEPROM and MRAM
in system for simpler, more ecient design
• Improves reliability by replacing battery-backed SRAM
• 3.3 Volt power supply
• Fast 35 ns read/write cycle
• SRAM compatible timing
• Native non-volatility
• Unlimited read & write endurance
• Data always non-volatile for >20 years at temperature
• Commercial and industrial temperatures
• All products meet MSL-3 moisture sensitivity level
• RoHS-Compliant TSOP2 and BGA packages
INTRODUCTION
48-ball FBGA
44-pin TSOP2
RoHS
MR256A08B Rev. 6.5 3/2018
2
Copyright © 2018 Everspin Technologies
MR256A08B
TABLE OF CONTENTS
FEATURES .............................................................................................................................................1
BENEFITS ...............................................................................................................................................1
INTRODUCTION ...................................................................................................................................1
BLOCK DIAGRAM AND PIN ASSIGNMENTS .......................................................................................4
Figure 1 – MR256A08B Block Diagram.................................................................................................................. 4
Table 1 – MR256A08B Pin Functions...................................................................................................................... 4
Figure 2 – Pin Diagrams for Available Packages (Top View)
1 ...................................................................... 5
Table 2 – Operating Modes ....................................................................................................................................... 5
ELECTRICAL SPECIFICATIONS ............................................................................................................6
Absolute Maximum Ratings ...........................................................................................................6
Table 3 – Absolute Maximum Ratings ................................................................................................................... 6
OPERATING CONDITIONS ...................................................................................................................7
Table 4 – Operating Conditions ............................................................................................................................... 7
Power Up and Power Down Sequencing .......................................................................................8
Figure 3 – Power Up and Power Down Sequencing Timing Diagram ....................................................... 8
DC CHARACTERISTICS .........................................................................................................................9
Table 5 – DC Characteristics ...................................................................................................................................... 9
Table 6 – Power Supply Characteristics ..............................................................................................................10
TIMING SPECIFICATIONS ................................................................................................................. 11
Table 7 – Capacitance ...............................................................................................................................................11
Table 8 – AC Measurement Conditions ..............................................................................................................11
Figure 4 – Output Load Test Low and High ....................................................................................................... 11
Figure 5 – Output Load Test All Others ...............................................................................................................11
Read Mode .................................................................................................................................... 12
Table 9 – Read Cycle Timing ...................................................................................................................................12