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AT25SF321B-SHB-T

RENAT25SF321B-SHB-T

Renesas Electronics Corporation
FLASH - NOR Memory IC 32Mbit SPI - Quad I/O 108 MHz 8-SOIC
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Overview

The AT25SF321B-SHB-T is a 32-Mbit Serial Peripheral Interface (SPI) NOR Flash memory IC designed for high-performance data storage. It supports Standard, Dual, and Quad I/O modes with clock frequencies up to 108 MHz, providing efficient throughput for code shadowing and data logging applications. Operating within a 2.7V to 3.6V range, it features ultra-low power consumption, including a deep power-down mode for battery-operated systems.

Why Choose This Part

This device offers a high-speed Quad I/O interface that significantly reduces data transfer times compared to standard SPI. It incorporates flexible memory protection features and three 256-byte OTP security registers for sensitive information. The low standby current of 13 uA and dedicated deep power-down mode make it an ideal choice for energy-constrained designs.

Applications

Firmware Code Shadowing
Storing executable code that is shadowed into RAM for high-speed execution in embedded microcontrollers.
Parameter Storage
Retaining system configuration data, calibration constants, and user settings across power cycles.
Data Logging
Capturing sensor readings and event logs in portable IoT devices and industrial instrumentation.
Boot Loader Storage
Reliable storage for primary bootloaders in systems requiring multi-stage startup sequences.

Key Specifications

Technology FLASH - NOR
Memory Size 32Mbit
Memory Type Non-Volatile
Memory Format FLASH
Mounting Type Surface Mount
Package / Case 8-SOIC (0.209", 5.30mm Width)
Clock Frequency 108 MHz
Memory Interface SPI - Quad I/O
Voltage - Supply 2.7V ~ 3.6V
Memory Organization 4M x 8
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 8-SOIC
Write Cycle Time - Word, Page 50us, 3ms

Getting Started

Integrate the device using a standard SPI bus with support for modes 0 or 3. Ensure the VDD supply is decoupled with a 0.1uF capacitor near the 8-SOIC package pins. For development, use standard Serial Flash Discoverable Parameters (SFDP) commands to simplify software driver implementation across different host microcontrollers.

Also Consider

W25Q32JVSSIQ Winbond Electronics - A widely used 32-Mbit Quad SPI Flash with similar performance specs and an 8-SOIC package.