MB85RS2M / FM25V20 Replacement: GX85RS2M Pin-to-Pin Compatible 2-Mbit SPI FRAM
GX85RS2M is a 2-Mbit ferroelectric random access memory developed for applications requiring fast, frequent and nonvolatile data storage. Its memory array is organized as 262,144 words × 8 bits and is accessed through a standard SPI serial interface.
Unlike SRAM, GX85RS2M retains stored data without a battery or continuous power supply. Unlike Flash memory and EEPROM, it does not require an erase operation, extended programming time or write-completion polling. Data is written directly through the SPI interface without an internal write-cycle delay.
The SOP-8 version provides pin-to-pin hardware and software compatibility with MB85RS2M and FM25V20 when used within the supported GX85RS2M voltage, timing and endurance specifications.
GX85RS2M as a Direct MB85RS2M and FM25V20 Replacement
GX85RS2M provides the same 2-Mbit capacity and 262,144 × 8-bit organization used by MB85RS2M and FM25V20. Its SPI interface supports connection to MCUs, DSPs, FPGAs and other embedded processors.
For compatible SOP-8 systems operating from 2.7 V to 3.6 V, GX85RS2M provides a direct migration path while retaining the existing schematic, PCB footprint and memory-access software.
GX85RS2M can also be selected for new industrial control and data-acquisition systems requiring rapid nonvolatile writes, high endurance and protection against data loss during unexpected power interruption.
Pin-to-Pin Hardware and Software Compatibility
The SOP-8 version of GX85RS2M is designed for pin-level hardware compatibility with the corresponding SOP-8 versions of MB85RS2M and FM25V20. Existing power, SPI and control-signal connections can be retained.
GX85RS2M also supports compatible SPI memory access and control functions. Existing firmware, address handling, read/write routines and memory-control logic can therefore continue to be used when the system complies with the GX85RS2M electrical and timing requirements.
For direct replacement, the following conditions should be verified:
The system supply must remain within the GX85RS2M operating range of 2.7 V to 3.6 V. Some MB85RS2M and FM25V20 versions support operation below 2.7 V.
The SPI clock frequency and interface timing must comply with the GX85RS2M datasheet.
The SOP-8 body dimensions and PCB land pattern must match the selected GX85RS2M package.
The required application lifetime must be evaluated against the GX85RS2M endurance rating of up to 10¹¹ read/write cycles.
Pin-to-pin replacement applies to the SOP-8 version. The bare-die option requires a suitable die-attach, wire-bonding and packaging design.
GX85RS2M vs MB85RS2M and FM25V20: Key Specification Comparison
|
Specification |
MB85RS2MTA |
FM25V20A |
GX85RS2M |
|
Memory Type |
Nonvolatile FeRAM |
Nonvolatile F-RAM |
Nonvolatile FRAM |
|
Capacity |
2 Mbit |
2 Mbit |
2 Mbit |
|
Organization |
262,144 × 8 Bits |
262,144 × 8 Bits |
262,144 × 8 Bits |
|
Interface |
SPI |
SPI |
SPI |
|
Supply Voltage |
1.7–3.6 V |
2.0–3.6 V |
2.7–3.6 V |
|
Operating Temperature |
−40°C to +85°C |
−40°C to +85°C |
−40°C to +85°C |
|
Maximum SPI Frequency |
40 MHz |
40 MHz |
Refer to GX85RS2M Datasheet |
|
Read/Write Endurance |
10¹³ Cycles |
10¹⁴ Cycles |
Up to 10¹¹ Cycles |
|
Internal Write-Cycle Delay |
No |
No |
No |
|
Package |
SOP-8, 150 mil / 208 mil |
SOIC-8 |
SOP-8 / Bare Die |
|
Pin-to-Pin Compatible |
— |
— |
Yes, SOP-8 Version |
|
Schematic or PCB Changes Required |
— |
— |
No, Subject to Operating Conditions |
|
Software Modification Required |
— |
— |
No, Subject to Supported Functions and Timing |
GX85RS2M maintains the capacity, memory organization, SPI architecture and rapid-write operation required by MB85RS2M- and FM25V20-based systems. Engineers should verify supply voltage, SPI frequency, package dimensions and write-endurance requirements before final replacement qualification.
High-Endurance Nonvolatile Storage and Applications
Key GX85RS2M features include:
l 2-Mbit nonvolatile FRAM
l 262,144 × 8-bit memory organization
l Standard SPI serial interface
l 2.7 V to 3.6 V operating voltage
l −40°C to +85°C operating temperature
l Up to 10¹¹ read/write cycles
l No battery required for data retention
l No erase operation before writing
l No internal write-cycle delay
l No write-completion polling required
l SOP-8 and bare-die package options
GX85RS2M is suitable for data logging and data collection, industrial automation, control systems, high-frequency event recording, configuration and parameter storage, instrumentation, metering equipment, UPS systems and power-failure data backup.
Supply and Technical Support
GXSC can provide samples, datasheets, compatibility verification and technical support for MB85RS2M and FM25V20 replacement projects.
Support is also available for SPI timing verification, package selection, endurance evaluation and the integration of GX85RS2M into new industrial data-storage systems.
Request GX85RS2M Datasheet and Samples
Contact GXSC to request the GX85RS2M datasheet, samples, quotation or technical support for your MB85RS2M or FM25V20 replacement project.
Before completing a replacement design, verify the supply voltage, SPI frequency and timing, pin definitions, package dimensions, write endurance and data-retention requirements against the applicable GX85RS2M datasheet.
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