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AT45DB041E-SSHN-T

AT45DB041E-SSHN-T

Microchip (former Atmel)
4 Mbit DataFlash family member that can serve similar roles for firmware and data storage on SPI buses.
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Overview

The AT45DB041E-SSHN-T is a 4-Mbit DataFlash memory device designed for storage of firmware or data in resource-constrained embedded systems. It operates over a wide voltage range from 1.65V to 3.6V and features a serial interface that simplifies PCB routing by utilizing only four signal lines. Unlike standard serial flash, DataFlash architecture provides flexible page-based programming and dual SRAM buffers to allow simultaneous read and write operations.

Why Choose This Part

The device features an extremely low standby current of 25uA, making it ideal for battery-powered designs. Its dual-buffer architecture allows engineers to write to one SRAM buffer while the other is being programmed into the main memory array, significantly improving system throughput. Additionally, the small 8-pin SOIC footprint minimizes board area requirements.

Applications

Firmware Storage
Maintains boot code and application firmware for microcontrollers lacking sufficient internal flash.
Data Logging
Records sensor telemetry or system logs in low-power industrial or consumer devices.
Configuration Management
Stores user settings, calibration constants, and network parameters that must persist through power cycles.
Voice and Image Storage
Serves as a repository for audio clips or small graphical assets in user interface applications.

Key Specifications

Technology FLASH
Memory Size 4Mbit
Memory Type Non-Volatile
Memory Format FLASH
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width)
Clock Frequency 85 MHz
Memory Interface SPI
Voltage - Supply 1.65V ~ 3.6V
Memory Organization 264 Bytes x 2048 pages
Operating Temperature -40degC ~ 85degC (TC)
Supplier Device Package 8-SOIC
Write Cycle Time - Word, Page 8us, 3ms

Getting Started

Integrate the device using a standard SPI peripheral with Clock Polarity (CPOL) and Clock Phase (CPHA) both set to 0 or 3. Microchip provides the Advanced Software Framework (ASF) and specialized DataFlash drivers to manage page-addressing and buffer operations. Ensure proper decoupling with a 0.1uF capacitor near the VCC pin to maintain stability during high-current programming cycles.

Also Consider

W25Q40CLSSIG Winbond Electronics - A standard 4-Mbit Serial Flash alternative for applications that do not require the dual SRAM buffer architecture of DataFlash.
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