Renesas AT25DN256-MAHFGP-Y

Overview

AT25DN256-MAHFGP-Y from Adesto Technologies is a 256-Kbit serial Flash memory IC with SPI interface, dual-output read capability, 104MHz max clock frequency, 6ns clock-to-output delay, and flexible erase architecture supporting 256-byte page, 4-Kbyte block, 32-Kbyte block, and full-chip erase - deployed in embedded code shadowing and mixed code/data storage systems.

For engineers reviewing the AT25DN256-MAHFGP-Y datasheet, AT25DN256-MAHFGP-Y pinout, AT25DN256-MAHFGP-Y application, or AT25DN256-MAHFGP-Y equivalent, key selection considerations include dual-I/O throughput optimization, hardware write protection via WP pin, 128-byte OTP security register (64B factory-unique ID + 64B user-programmable), ultra-deep power-down current (350nA typical), and industrial temperature range support (-40°C to +85°C).

Technical Context

The AT25DN256-MAHFGP-Y implements a standard SPI master-slave interface supporting Modes 0 and 3, with data latched on SCK rising edge and output on falling edge. Its dual-output read mode repurposes SI as I/O0 alongside SO (I/O1) to deliver two bits per clock cycle, enabling up to 50MHz effective data rate.

It features an optimized memory architecture with uniform 4-Kbyte and 32-Kbyte erase blocks plus 256-byte page erase granularity, eliminating wasted space in mixed code-and-data layouts. The integrated 128-byte OTP security register includes factory-programmed unique device ID and user-programmable fields for ESN or key storage.

Key Specifications

Pinout & Package

AT25DN256-MAHFGP-Y is packaged in an 8-lead SOIC (150-mil) - RoHS-compliant, green, Pb/halide-free - with standard SPI-compatible pin assignment and hardware write protection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial Flash memory applications.

Compared with W25Q256JVSIM and MX25L25635FZC-10G, the AT25DN256-MAHFGP-Y uniquely balances compact 256-Kbit density, dual-output throughput acceleration, hardware write protection, and factory-programmed unique ID - making it optimal for resource-constrained, security-aware embedded systems where memory efficiency and device trust are co-prioritized.

Availability

AT25DN256-MAHFGP-Y is available at Aetrix Electronics and suitable for industrial control firmware storage, IoT edge node code + configuration, consumer audio device boot memory, and medical diagnostic instrument data log applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for AT25DN256-MAHFGP-Y 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

Adesto Technologies (acquired by Dialog Semiconductor, now part of Renesas Electronics) specialized in low-power, high-reliability nonvolatile memory and IoT connectivity solutions for industrial and embedded markets.

The AT25DN256 product line was designed for mixed code-and-data storage in space-constrained, battery-sensitive systems - emphasizing erase flexibility, ultra-low power states, and integrated security primitives like OTP registers.

FAQ

What is the maximum clock frequency supported by AT25DN256-MAHFGP-Y for standard read operations?

The AT25DN256-MAHFGP-Y supports up to 104MHz for standard Read Array (0Bh opcode) operations. For legacy 03h opcode reads, the maximum is 33MHz. This high-frequency capability enables fast microcontroller boot and real-time firmware execution, and the 6ns clock-to-output delay ensures minimal latency in time-critical applications using the AT25DN256-MAHFGP-Y.

Does AT25DN256-MAHFGP-Y support dual-output read, and how does it affect data throughput?

Yes, the AT25DN256-MAHFGP-Y supports Dual-Output Read using opcode 3Bh, which repurposes the SI pin as I/O0 alongside SO (I/O1) to output two bits per SCK cycle. This doubles effective data rate versus standard SPI read at the same clock frequency - achieving up to 50MHz effective throughput - significantly accelerating firmware loading and configuration access in the AT25DN256-MAHFGP-Y.

What erase options are available on AT25DN256-MAHFGP-Y, and why is granular erase important?

The AT25DN256-MAHFGP-Y supports 256-byte page erase, 4-Kbyte block erase, 32-Kbyte block erase, and full-chip erase. Granular erase prevents over-erasure of unused memory regions - critical for efficient firmware patching and dynamic data logging. This architecture directly improves usable memory density and extends endurance in applications relying on the AT25DN256-MAHFGP-Y for mixed code-and-data storage.

How is hardware write protection implemented on AT25DN256-MAHFGP-Y?

Hardware write protection on the AT25DN256-MAHFGP-Y is controlled via the active-low WP pin, which locks protected sectors independently of software commands. The WP pin is internally pulled high and can be left floating if unused, but external connection to VCC is recommended for noise immunity. This feature prevents accidental firmware corruption during power transients or software faults in systems using the AT25DN256-MAHFGP-Y.

What is the purpose and structure of the OTP security register in AT25DN256-MAHFGP-Y?

The AT25DN256-MAHFGP-Y includes a 128-byte One-Time Programmable (OTP) security register: 64 bytes factory-programmed with a unique device identifier, and 64 bytes user-programmable for ESN, cryptographic keys, or calibration data. Once programmed, OTP contents cannot be altered - providing tamper-resistant device identity essential for secure boot and cloud authentication workflows leveraging the AT25DN256-MAHFGP-Y.