Memory & Logic

Overview

The AT25SF321B is a member of our standard class code and data storage solutions designed for 3V systems in which program code is shadowed from Flash memory into embedded or external RAM for execution.

The architecture includes erase block sizes that are optimized to meet the needs of today's code and data storage applications and three security register pages for unique device serialization, system-level Electronic Serial Number (ESN) storage, locked key storage, etc.

  • Universally compatible pinout and command set
  • Standard block architecture
  • Supports Dual I/O, Quad I/O and XiP operation
  • Continuous read, wrap and burst modes for XiP
AT25x
AT25x

Documentation

Type Title Date
Datasheet
AT25SF321B Datasheet
PDF 1.87 MB
Application Note
AN116 PCB Footprint Landing Pattern Recommendations
PDF 294 KB
Guide
SPI NOR FLASH Guide - Standard and System Enhancing Memory
PDF 790 KB
Product Change Notice
PCN071A: Change Wide SOIC and 5x6mm DFN packaging from Au (Gold) wire bonding, to Cu (Copper) wire bonding
PDF 195 KB
Application Note
AN407: Migrating from Macronix NOR Flash to Renesas NOR Flash
ZIP 401 KB
Other
How System Level Noise in Digital Interfaces can Lead to Spurious Errors in Serial Flash Memory
PDF 1.00 MB
Application Note
AN502: FAQs: NOR Flash Application Note
PDF 355 KB
Application Note
AN115 Flash Protection Schemes and Methods
PDF 794 KB
Application Note
AN501: Power-Up/Down Considerations in NOR Flash
PDF 663 KB
Application Note
AN500:NOR Flash Memory Erase Operation
PDF 956 KB
Application Note
AN005 Rev A Active Interrupt Proven to Lower Power Consumption
PDF 1.10 MB
Application Note
AN111: Implementing Ultra Deep Power Down Mode in AT25xx Series and AT45xx Series
PDF 504 KB
Other
Adesto Serial Flash Power Saving Features and Concepts
PDF 1.21 MB
Product Brief
Dual Quad Products Overview
PDF 1.14 MB
White Paper
Tech Note TN-111, Effect of Excessive Number of CS Toggle Operations on AT25SF641 and AT25QF641
PDF 399 KB
Application Note
AN105 PCB Design and Layout Considerations
PDF 313 KB
Product Change Notice
PCN034 Addendum: Capacity Expansion for the .150" Narrow SOIC Product Package
PDF 100 KB
Product Change Notice
PCN034: Capacity Expansion for the .150" Narrow SOIC Product Package
PDF 615 KB
Product Change Notice
PCN038: Wafer Probe Facility Addition Teraprobe
PDF 92 KB
Product Change Notice
PCN039: Wafer Probe Test Equipment Transfer
PDF 142 KB
Product Change Notice
PCN044: Manufacturing Capacity Expansion; narrow .150" SOIC device package
PDF 183 KB
Product Change Notice
PCN045: Capacity Expansion Greatek Taiwan for Wide and Narrow SOIC Packages
PDF 193 KB
Product Change Notice
PDF-SF004: Adesto® Serial Flash & DataFlash® Products Package Marking Change
PDF 97 KB
Product Change Notice
PDF-SF005: Adesto® Products – Wafer Probe Test Site
PDF 647 KB
Product Change Notice
PDF-SF022: Capacity Expansion for the UDFN Product Package
PDF 138 KB
Product Change Notice
PDF-SF026:Capacity Expansion for the .208" Wide SOIC Product Package
PDF 148 KB
Product Change Notice
PDF032: Manufacturing Capacity Expansion for the 8-contact, 6 x 8mm VDFN Package
PDF 528 KB
27 items

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Models
Type Title Date
Model - IBIS
AT25SF321B IBIS Model
ZIP 46 KB
Model - Verilog
AT25SF321B Verilog Model
ZIP 15 KB
2 items

Product Options

    Processing table
    Pkg. Type
    Carrier Type
    Buy / Sample
    Part Number
    AT25SF321B-SSHB-B
    play_circleActive
    memory
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    		SOIC-N Tube
    AT25SF321B-SSHB-T
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    memory
    view_in_ar
    		SOIC-N Tape & Reel
    AT25SF321B-SHB-B
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    memory
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    		SOIC-W Tube
    AT25SF321B-SHB-T
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    memory
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    		SOIC-W Tape & Reel
    AT25SF321B-MHB-T
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    memory
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    		DFN Tape & Reel
    AT25SF321B-DWF
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    memory
    view_in_ar
    		DWF
    Parametric Table tips

    Tips for Using This Parametric Table:

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    • Cart icon to the right of the chip icon: Indicates that samples are available for this product