MB85RC256LYPN-GS-AMEWE1

Memory IC Overview

The MB85RC256LY is a 256 Kbit Ferroelectric Random Access Memory (FeRAM) IC configured as 32,768 words by 8 bits. It utilizes an I2C serial interface and operates within a supply voltage range of 1.7 V to 1.95 V. The device supports communication frequencies up to 3.4 MHz in High Speed Mode and 1 MHz in Fast Mode Plus. It features a write endurance of at least 10^13 cycles per byte and does not require polling sequences after writing. The component is AEC-Q100 compliant and available in 8-pin SOP or DFN packages.

Memory IC Feature Summary

• Ferroelectric memory technology providing non-volatile data retention without backup batteries
• I2C two-wire serial interface supporting standard, fast, and high-speed modes
• Hardware write protection via dedicated WP pin for secure data storage
• AEC-Q100 automotive qualification with extended temperature operation capabilities

Memory IC Applications

• Automotive electronic systems requiring robust non-volatile data logging
• Industrial control units needing high endurance memory for frequent parameter updates
• Embedded devices utilizing low-power I2C bus architectures
• Smart metering applications demanding long-term data retention reliability

Memory IC Procurement Notes

Verify the specific package variant required, as the MB85RC256LY series includes distinct ordering suffixes for SOP tubes, SOP tape-and-reel, DFN trays, and DFN tape-and-reel configurations. Confirm that the system power supply strictly adheres to the 1.7 V to 1.95 V operating range to ensure electrical characteristics remain within specification. Ensure I2C pull-up resistors are correctly sized for the selected clock frequency mode.

Memory IC Selection Notes

Select this component when a design requires high write endurance exceeding 10^13 cycles, which outperforms traditional Flash or EEPROM technologies. It is suitable for applications where battery-free non-volatility and low standby current are critical constraints. Choose between SOP and DFN packages based on board space limitations and thermal management requirements. Ensure the host controller supports the I2C protocol variations, including the High Speed Mode entry command sequence.

Memory IC Part Context

This part belongs to the MB85RC256LY family of 256 Kbit FeRAM devices manufactured by RAMXEED Limited. The manufacturer continues to support existing Fujitsu Semiconductor part numbers under the new corporate identity. The product line emphasizes high reliability and endurance for industrial and automotive environments, maintaining compatibility with standard I2C bus protocols while offering enhanced speed options.

Memory IC Replacement Considerations

Direct replacements include other MB85RC256LY variants with different packaging suffixes such as MB85RC256LYPNF-GS-BCE1 or MB85RC256LYPN-GS-AWE1. Cross-brand substitution requires verification of I2C address codes and voltage levels, as generic F-RAM parts may differ in timing specifications or operating voltage ranges.

Memory IC FAQ

Does the MB85RC256LY require an acknowledge polling sequence after writing data?

No, the device performs high-speed write operations internally, eliminating the need for ACK polling wait times typically required by Flash or EEPROM memories.

How is the device address determined on the I2C bus?

The 8-bit device address consists of a fixed type code (1010), three hardware-configurable address bits (A2, A1, A0), and a read/write bit, allowing up to eight devices on the same bus.

What is the function of the WP pin?

The Write Protect (WP) pin disables all write operations when set to a high level, while reading remains enabled regardless of the pin state. It is internally pulled down to allow writes by default if left open.