MB85RC64 / FM24C64 Replacement: GX24C64 Pin-to-Pin Compatible 64-Kbit I²C FRAM
GX24C64 is a 64-Kbit ferroelectric random access memory developed for industrial systems requiring fast and reliable nonvolatile data storage. Its memory array is organized as 8,192 words × 8 bits and is accessed through a standard two-wire I²C interface.
Unlike SRAM, GX24C64 retains stored data without a battery or continuous power supply. Unlike conventional Flash memory and EEPROM, it does not require an erase operation, acknowledge polling or an internal write-cycle delay after data is written.
The SOP-8 version provides pin-to-pin hardware and software compatibility with MB85RC64 and compatible low-voltage FM24C64-family devices when operated within the GX24C64 electrical and timing specifications.
GX24C64 as a Direct MB85RC64 and FM24C64 Replacement
GX24C64 provides the same 64-Kbit capacity and 8,192 × 8-bit organization used by MB85RC64 and FM24C64-family devices. Its I²C interface supports simple connection to MCUs, DSPs, FPGAs and embedded processors.
For compatible SOP-8 systems operating from 2.7 V to 3.6 V, GX24C64 provides a direct migration path while retaining the existing schematic, PCB footprint and memory-access software.
GX24C64 can also be selected for new industrial control, instrumentation, metering and data-logging systems requiring nonvolatile memory with rapid write operation and protection against data loss during power interruption.
Pin-to-Pin Hardware and Software Compatibility
The SOP-8 version of GX24C64 is designed for pin-level hardware compatibility with compatible SOP-8 versions of MB85RC64 and FM24C64. Existing supply, SDA, SCL, device-address and write-protect connections can be retained.
GX24C64 also supports compatible I²C memory access and control functions. Existing device addressing, read/write routines and memory-control software can therefore continue to be used when the system complies with the GX24C64 electrical and timing requirements.
For direct replacement, the following conditions should be verified:
The system supply must remain within the GX24C64 operating range of 2.7 V to 3.6 V.
GX24C64 is suitable for low-voltage FM24CL64B-type designs. The 4.5 V to 5.5 V FM24C64B is not directly supply-compatible with GX24C64.
The I²C bus frequency, timing and pull-up resistor configuration must comply with the GX24C64 datasheet.
The SOP-8 body dimensions and PCB land pattern must match the selected GX24C64 package.
Pin-to-pin replacement applies to the SOP-8 version. The bare-die option requires a suitable die-attach, wire-bonding and packaging design.
GX24C64 vs MB85RC64 and FM24C64: Key Specification Comparison
|
Specification |
MB85RC64A |
FM24CL64B |
FM24C64B |
GX24C64 |
|
Memory Type |
Nonvolatile FeRAM |
Nonvolatile F-RAM |
Nonvolatile F-RAM |
Nonvolatile FRAM |
|
Capacity |
64 Kbit |
64 Kbit |
64 Kbit |
64 Kbit |
|
Organization |
8,192 × 8 Bits |
8,192 × 8 Bits |
8,192 × 8 Bits |
8,192 × 8 Bits |
|
Interface |
I²C |
I²C |
I²C |
I²C |
|
Supply Voltage |
2.7–3.6 V |
2.7–3.6 V |
4.5–5.5 V |
2.7–3.6 V |
|
Operating Temperature |
−40°C to +85°C |
−40°C to +85°C |
−40°C to +85°C |
−40°C to +85°C |
|
Maximum I²C Frequency |
1 MHz |
1 MHz |
1 MHz |
Refer to GX24C64 Datasheet |
|
Acknowledge Polling After Write |
Not Required |
Not Required |
Not Required |
Not Required |
|
Internal Write-Cycle Delay |
No |
No |
No |
No |
|
Package |
SOP-8 |
SOIC-8 |
SOIC-8 |
SOP-8 / Bare Die |
|
Pin-to-Pin Compatible |
— |
— |
— |
Yes, for Compatible Low-Voltage SOP-8 Versions |
|
Schematic or PCB Changes Required |
— |
— |
— |
No for Compatible 2.7–3.6 V Designs |
|
Software Modification Required |
— |
— |
— |
No, Subject to Supported Functions and Timing |
GX24C64 maintains the capacity, memory organization, I²C architecture and immediate-write operation required by compatible MB85RC64- and FM24C64-based systems. Supply voltage must be checked carefully because the FM24C64 family includes both low-voltage and 5 V versions.
Fast Nonvolatile Storage and Applications
Key GX24C64 features include:
l 64-Kbit nonvolatile FRAM
l 8,192 × 8-bit memory organization
l Standard two-wire I²C 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 operation before writing
l No internal write-cycle delay
l No acknowledge polling required after writing
l SOP-8 and bare-die package options
GX24C64 is suitable for data logging, event recording, industrial automation, control systems, 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 MB85RC64 and FM24C64 replacement projects.
Support is also available for supply-voltage verification, I²C timing evaluation, device-address configuration, package selection and integration into new nonvolatile storage designs.
Request GX24C64 Datasheet and Samples
Contact GXSC to request the GX24C64 datasheet, samples, quotation or technical support for your MB85RC64 or FM24C64 replacement project.
Before completing a replacement design, verify the supply voltage, I²C frequency and timing, device address, pull-up resistors, pin definitions and package dimensions against the applicable GX24C64 datasheet.
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