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AT25SF321B-SSHB-B

RENAT25SF321B-SSHB-B

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

The AT25SF321B-SSHB-B is a 32Mbit serial NOR flash memory designed for high-performance code shadowing and data storage applications. It operates over a wide voltage range of 2.7V to 3.6V and supports Standard, Dual, and Quad I/O SPI interfaces with clock frequencies up to 108 MHz. With its low power consumption, including a 1uA shutdown mode, it is well-suited for battery-powered embedded systems.

Why Choose This Part

This device offers excellent power efficiency with active read currents as low as 3mA at 20MHz and a standby current of 13uA. It features a built-in oscillator and SFDP registers for simplified software integration, along with flexible memory protection schemes to prevent accidental data corruption.

Applications

Firmware Shadowing
High-speed 108 MHz Quad SPI performance enables rapid code execution and shadowing from flash to RAM during system boot.
IoT Edge Nodes
The ultra-low 1uA deep power-down current makes it ideal for remote sensors and connected devices that spend most of their time in sleep states.
Secure Data Logging
Includes three 256-byte OTP security registers and hardware write protection for storing sensitive calibration or identification data.
Parameter Storage
Flexible erase architectures, including 4KB, 32KB, and 64KB blocks, allow for efficient management of system settings and lookup tables.

Key Specifications

Technology FLASH - NOR
Memory Size 32Mbit
Memory Type Non-Volatile
Memory Format FLASH
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm 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 (TC)
Supplier Device Package 8-SOIC
Write Cycle Time - Word, Page 50us, 3ms

Getting Started

Integration requires a standard SPI controller capable of Mode 0 or Mode 3 operation. Developers should use the JEDEC Standard Manufacturer and Device ID for runtime verification and can leverage the SFDP register to automatically discover device capabilities during initialization.

Also Consider

W25Q32JVSSIQ Winbond Electronics - A widely used alternative with similar 133 MHz performance and compatible Quad SPI command sets.