MB85RS128 / FM25V01 Replacement: GX85RS128 Pin-to-Pin Compatible 128-Kbit SPI FRAM
GX85RS128 is a 128-Kbit ferroelectric random access memory designed for industrial systems requiring fast, nonvolatile data storage. Its memory array is organized as 16,384 words × 8 bits and is accessed through a standard SPI serial interface.
Unlike SRAM, GX85RS128 retains stored data without a battery or continuous power. Unlike Flash and EEPROM, it does not require an erase operation, extended write cycle or write-completion waiting period. Data can therefore be written directly through the SPI interface, supporting frequent parameter updates, event recording and power-failure data storage.
The SOP-8 version provides pin-to-pin hardware and software compatibility with MB85RS128 and FM25V01 for systems operating within the GX85RS128 supply and timing specifications.
GX85RS128 as an MB85RS128 and FM25V01 Replacement
GX85RS128 provides the same 128-Kbit capacity and 16,384 × 8-bit organization used by MB85RS128 and FM25V01. Its SPI interface supports straightforward connection to MCUs, DSPs, FPGAs and other embedded controllers.
For compatible SOP-8 designs operating from 2.7 V to 3.6 V, GX85RS128 provides a direct migration path while retaining the existing schematic, PCB footprint and memory-access software.
GX85RS128 can also be selected for new industrial control, data-logging, metering and configuration-storage designs requiring nonvolatile memory with rapid write operation.
Pin-to-Pin Hardware and Software Compatibility
The SOP-8 version of GX85RS128 is designed for pin-level hardware compatibility with the corresponding SOP-8 versions of MB85RS128 and FM25V01. Existing power, SPI and control-signal connections can be retained.
GX85RS128 also supports compatible SPI memory access and control functions, allowing existing firmware and memory read/write routines to be retained when the system operates within the supported electrical and timing conditions.
The following replacement conditions should be verified:
The system supply must remain within the GX85RS128 operating range of 2.7 V to 3.6 V. FM25V01 supports operation below 2.7 V, but GX85RS128 does not.
The SPI clock frequency and timing must comply with the GX85RS128 datasheet.
The required write endurance and data-retention lifetime must be checked against the selected GX85RS128 version.
Pin-to-pin replacement applies to the SOP-8 version. The bare-die version requires a suitable die-attach, bonding and packaging design.
GX85RS128 vs MB85RS128 and FM25V01: Key Specification Comparison
|
Specification |
MB85RS128B |
FM25V01A |
GX85RS128 |
|
Memory Type |
Nonvolatile FRAM |
Nonvolatile F-RAM |
Nonvolatile FRAM |
|
Capacity |
128 Kbit |
128 Kbit |
128 Kbit |
|
Organization |
16,384 × 8 Bits |
16,384 × 8 Bits |
16,384 × 8 Bits |
|
Interface |
SPI |
SPI |
SPI |
|
Supply Voltage |
2.7–3.6 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 |
33 MHz |
40 MHz |
Refer to GX85RS128 Datasheet |
|
Read/Write Endurance |
10¹² Cycles |
10¹⁴ Cycles |
10⁶ or 10⁸ Cycles, Version-Dependent |
|
Package |
SOP-8 |
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 |
GX85RS128 provides compatible capacity, organization, SPI access and SOP-8 connectivity. Because its specified endurance differs from the reference devices, engineers should verify the applicable GX85RS128 endurance grade against the expected write frequency and required product lifetime.
Fast Nonvolatile Storage and Applications
Key GX85RS128 features include:
l 128-Kbit nonvolatile FRAM
l 16,384 × 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 No battery required for data retention
l No erase cycle before writing
l No extended write delay or polling period
l 10⁶- or 10⁸-cycle endurance versions
l SOP-8 and bare-die options
GX85RS128 is suitable for industrial automation and control systems, data logging, event recording, instrumentation, utility meters, configuration and parameter storage, UPS equipment and power-failure data backup.
Supply and Technical Support
GXSC can provide samples, datasheets, compatibility verification and technical support for MB85RS128 and FM25V01 replacement projects.
Support is also available for SPI timing verification, package selection, endurance evaluation and the integration of GX85RS128 into new nonvolatile storage designs.
Request GX85RS128 Datasheet and Samples
Contact GXSC to request the GX85RS128 datasheet, samples, quotation or technical support for your MB85RS128 or FM25V01 replacement project.
Before finalizing a replacement, verify the supply voltage, SPI clock and timing, pin definitions, package dimensions, endurance rating and data-retention requirements against the applicable GX85RS128 datasheet.
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