MB85RC512 / FM24C512 Replacement: GX24C512 Pin-Compatible 512-Kbit I²C FRAM
GX24C512 is a 512-Kbit ferroelectric random access memory developed for systems requiring fast and reliable nonvolatile data storage. Its memory array is organized as 65,536 words × 8 bits and is accessed through a standard two-wire I²C interface.
Unlike SRAM, GX24C512 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 a write operation.
The SOP-8 version supports direct replacement of compatible MB85RC512-based systems operating from 2.7 V to 3.6 V. Compatibility with FM24C512-based products depends on the exact device version and supply voltage because the original FM24C512 is a 5 V device.
GX24C512 as an MB85RC512 and FM24C512 Replacement
GX24C512 provides the same 512-Kbit capacity and 65,536 × 8-bit organization used by MB85RC512 and FM24C512-family devices. Its I²C interface supports connection to MCUs, DSPs, FPGAs and other embedded processors.
For compatible MB85RC512 SOP-8 systems operating from 2.7 V to 3.6 V, GX24C512 provides a direct migration path while retaining the existing schematic, PCB footprint and memory-access software.
GX24C512 is also suitable for new industrial control, smart-metering, instrumentation and data-logging designs requiring higher storage capacity and rapid nonvolatile writes.
Pin, Hardware and Software Compatibility
The SOP-8 version of GX24C512 is designed for pin-level hardware compatibility with compatible MB85RC512 and FM24C512-family pin configurations. Existing SDA, SCL, device-address, write-protect and ground connections can be retained.
GX24C512 also supports compatible I²C memory access and control functions. Existing device addressing, read/write routines and memory-control software can continue to be used when the system complies with the GX24C512 electrical and timing requirements.
The following replacement conditions should be verified:
The GX24C512 supply voltage must remain between 2.7 V and 3.6 V.
MB85RC512 versions supporting lower voltages can be replaced directly only when the actual system supply does not fall below 2.7 V.
The original FM24C512 operates from a 5 V supply and is not directly voltage-compatible with GX24C512. Replacing it may require modification of the power rail and I²C pull-up voltage.
Low-voltage 512-Kbit devices such as FM24V05 are closer electrical references for GX24C512.
The I²C frequency, interface timing, device-address configuration and pull-up resistors must comply with the GX24C512 datasheet.
Pin-to-pin replacement applies to the matching SOP-8 version. The bare-die option requires a suitable die-attach, wire-bonding and packaging design.
GX24C512 vs MB85RC512 and FM24C512: Key Specification Comparison
|
Specification |
MB85RC512T |
Original FM24C512 |
FM24V05 |
GX24C512 |
|
Memory Type |
Nonvolatile FeRAM |
Nonvolatile F-RAM |
Nonvolatile F-RAM |
Nonvolatile FRAM |
|
Capacity |
512 Kbit |
512 Kbit |
512 Kbit |
512 Kbit |
|
Organization |
65,536 × 8 Bits |
65,536 × 8 Bits |
65,536 × 8 Bits |
65,536 × 8 Bits |
|
Interface |
I²C |
I²C |
I²C |
I²C |
|
Supply Voltage |
1.7–3.6 V |
4.5–5.5 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 |
−40°C to +85°C |
|
Maximum I²C Frequency |
3.4 MHz |
1 MHz |
3.4 MHz |
Refer to GX24C512 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 |
|
Pinout Compatibility |
— |
— |
— |
Yes, Matching SOP-8 Version |
|
Direct Voltage Compatibility |
At 2.7–3.6 V |
No, Supply Modification Required |
At 2.7–3.6 V |
— |
|
Software Modification Required |
— |
— |
— |
No, Subject to Supported Functions and Timing |
GX24C512 maintains the capacity, memory organization, I²C architecture and immediate-write operation required by compatible 512-Kbit FRAM systems. The exact reference-device suffix and system supply voltage must be confirmed before declaring a no-change replacement.
Fast 512-Kbit Nonvolatile Storage and Applications
Key GX24C512 features include:
l 512-Kbit nonvolatile FRAM
l 65,536 × 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
GX24C512 is suitable for data logging, event recording, industrial automation, industrial control, smart meters, utility metering, instrumentation, measurement equipment, configuration and parameter storage, UPS systems and power-failure data backup.
Supply and Technical Support
GXSC can provide samples, datasheets, compatibility verification and technical support for MB85RC512 and FM24C512 replacement projects.
Support is also available for supply-voltage verification, I²C timing evaluation, device-address configuration, pull-up resistor selection and package compatibility assessment.
Request GX24C512 Datasheet and Samples
Contact GXSC to request the GX24C512 datasheet, samples, quotation or technical support for your MB85RC512 or FM24C512 replacement project.
Before completing a replacement design, verify the exact reference-device suffix, supply voltage, I²C frequency and timing, device address, pull-up voltage, pin definitions and package dimensions against the GX24C512 datasheet.
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