Renesas M10042040054X0PSAY

Overview

M10042040054X0PSAY from Renesas is a 4Mb serial STT-MRAM non-volatile memory IC with QSPI interface, 54MHz DDR timing, 1.71–2.0V or 2.7–3.6V supply, industrial-plus temperature range (−40°C to +105°C), and 8-pad DFN (WSON) package. It delivers SRAM-compatible random read/write latency with persistent data retention, ideal for real-time industrial logging in factory automation systems.

For engineers reviewing the M10042040054X0PSAY datasheet, M10042040054X0PSAY pinout, M10042040054X0PSAY application, or M10042040054X0PSAY equivalent, key selection criteria include its dual-voltage support, hardware/software write protection, 256-byte augmented storage array, JEDEC reset compliance, and guaranteed 10¹⁵ write cycles with 20-year data retention at 105°C.

Technical Context

This MRAM uses 40nm perpendicular magnetic tunnel junction (pMTJ) spin-transfer torque technology, enabling true byte-addressable random access without erase cycles. Its QSPI interface supports x4 I/O (1-4-4) configuration in both SDR and DDR modes, with command/address/data latched on rising/falling clock edges respectively in DDR mode.

The device integrates dedicated command/control logic, high-voltage generator for memory switching, and dual protection layers: hardware-based WP# pin control and software-configurable block/sector protection via status and configuration registers. It also features eXecute-In-Place (XIP) mode to reduce instruction overhead during burst reads.

Key Specifications

Pinout & Package

8-pad DFN (WSON) package, 5.0mm × 6.0mm body, 0.5mm pitch, wettable flank leads. Pin 1 marked by top-side dot; thermal pad exposed on underside for PCB heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial non-volatile memory applications.

Compared with FM25V04 and CY14B104QN, M10042040054X0PSAY uniquely combines dual-voltage support, QPI DDR speed, industrial-plus temperature rating, and integrated 256-byte protected storage - making it optimal for new-design high-reliability embedded systems requiring zero-latency non-volatility.

Availability

M10042040054X0PSAY is available at Aetrix Electronics and suitable for factory automation, medical diagnostics, and industrial control applications requiring stable component supply, long-term lifecycle assurance, and RoHS/REACH-compliant sourcing.

Supply support for M10042040054X0PSAY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.

The Mxxxx204 family is designed as Persistent SRAM (P-SRAM) replacements - delivering true SRAM-like performance with non-volatile data retention for mission-critical embedded systems where data integrity cannot be compromised.

FAQ

What voltage ranges does the M10042040054X0PSAY support?

M10042040054X0PSAY supports two independent supply ranges: 1.71V to 2.00V (1.8V nominal) and 2.70V to 3.60V (3.0V nominal). The device automatically adapts to the applied VCC level and meets all AC/DC specifications across both ranges. This dual-voltage capability allows seamless integration into mixed-power-rail systems without level-shifting circuitry. M10042040054X0PSAY does not support intermediate voltages such as 2.5V or 3.3V outside these specified bands.

Does the M10042040054X0PSAY require an external pull-up resistor on the CS# pin?

Yes, a 10kΩ pull-up resistor to VCC is recommended on the CS# pin per the device initialization guidelines. This ensures proper power-up sequencing where CS# follows VCC ramp-up, preventing undefined behavior during startup. Without this resistor, floating CS# may cause unintended device activation or failure to enter standby mode reliably. The M10042040054X0PSAY datasheet explicitly specifies this requirement in Section 7 (Device Initialization) and Figure 6 (Power-Up Behavior).

How is write protection implemented on the M10042040054X0PSAY?

M10042040054X0PSAY implements dual-layer write protection: hardware-based via the WP# pin (active-low, enabled by SR[7]) and software-based via configuration bits (BPSEL[2:0], TBSEL, SNPEN). When WP# is driven low and WP#EN=1, the status register becomes read-only. Software protection allows selective locking of top/bottom memory regions or individual 32-byte sections of the 256-byte augmented storage array. Both mechanisms can be used concurrently for defense-in-depth security in M10042040054X0PSAY deployments.

What is the purpose of the Augmented Storage Array in the M10042040054X0PSAY?

The Augmented Storage Array is a dedicated 256-byte memory region, physically separate from the main 4Mb array, partitioned into eight 32-byte individually programmable and write-protectable sections. It is intended for storing critical system data such as calibration constants, device serial numbers, cryptographic keys, or firmware version stamps. Unlike the main array, each section can be locked independently using configuration registers - ensuring M10042040054X0PSAY maintains secure, tamper-resistant storage for immutable parameters without affecting application data.

Can the M10042040054X0PSAY operate in Deep Power Down mode while retaining data?

Yes, M10042040054X0PSAY retains full memory content and register configurations during Deep Power Down mode, drawing only 1µA typical current. Entry requires the EDP command (B9h); exit uses EXDPD (ABh), with tEXDPD ≤ 400µs. All protection settings, status bits, and augmented storage contents remain intact. This makes M10042040054X0PSAY suitable for battery-powered diagnostic tools that must preserve state across weeks of standby - unlike volatile memories requiring backup power or refresh.