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AT45DB081E-SSHN2B-T

8Mbit DataFlash SPI, dual SRAM buffers, 85MHz, SOIC-8

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Manufacturer Part：

AT45DB081E-SSHN2B-T

Package：

8-lead SOIC (0.208 inch, 5.3 x 8.0 mm)

Description

Product Overview

The AT45DB081E-SSHN2B-T is an 8-Mbit (1MB) DataFlash SPI serial Flash memory with dual SRAM buffers, 85MHz max clock, and 1.7V to 3.6V operation in 8-lead SOIC package.

Key Specifications

Memory Density	8 Mbit (1,048,576 x 8 + extra 256 Kbit)
Organization	4,096 pages of 256/264 bytes
Interface	SPI (Mode 0 and Mode 3), RapidS compatible
Max Clock Frequency	85 MHz
Supply Voltage	1.7 V to 3.6 V
SRAM Buffers	2 x 256/264 bytes (dual independent)
Page Program Time	Self-timed
Endurance	100,000 program/erase cycles per page
Data Retention	20 years
Active Read Current	11 mA typical @ 20MHz
Standby Current	25 uA typical
Deep Power-Down	4.5 uA typical
Ultra-Deep Power-Down	400 nA typical
OTP Security Register	128 bytes (64 factory + 64 user)
Package	8-lead SOIC (0.208 inch wide)
Operating Temperature	-40 to +85 C

Features

Dual independent SRAM buffers for simultaneous read/write
85MHz RapidS SPI interface for high-speed data throughput
Flexible erase: page (256B), block (2KB), sector (64KB), chip
Program and erase suspend/resume capability
Individual sector protection and lockdown with OTP register

Applications

Digital voice and image storage
Embedded system firmware and data logging
Industrial data acquisition with dual-buffer streaming
Configuration storage for FPGAs and CPLDs
EEPROM emulation using buffer read-modify-write

Product Introduction:AT45DB081E-SSHN2B-T Product Introduction

The AT45DB081E-SSHN2B-T is an 8-Mbit DataFlash serial Flash memory with dual SRAM buffers in 8-lead SOIC package. The device supports SPI Mode 0 and Mode 3 with RapidS operation up to 85MHz. The unique dual-buffer architecture allows simultaneous data reception while reprogramming the main memory array, enabling continuous data streaming in logging applications. The page size is configurable as 256 or 264 bytes (factory pre-configurable). The device features individual sector protection, sector lockdown, and a 128-byte OTP security register with 64 bytes factory-programmed unique identifier and 64 bytes user-programmable. The SSHN2B-T suffix denotes 8-lead SOIC (0.208 inch) with tape and reel packaging. Originally designed by Atmel/Adesto, now produced by Renesas.

Working Principle:AT45DB081E-SSHN2B-T Working Principle

The AT45DB081E-SSHN2B-T operates as a sequential-access DataFlash memory with dual SRAM buffers. (1) Unlike standard SPI Flash memories that use sector-based erase and page-based program, the DataFlash uses a page-based architecture with 4,096 pages of 256/264 bytes each. The dual SRAM buffers (Buffer 1 and Buffer 2) allow the host to write data into one buffer while the other buffer is being programmed into the main memory array. This ping-pong operation enables continuous data streaming without wait states. (2) The SPI interface uses standard opcodes for all operations. A typical write sequence involves: loading data into a buffer via Buffer Write command, then issuing a Buffer-to-Main-Memory Page Program with Built-In Erase command. The erase and program are self-timed, and the host can poll the status register (bit 7) to determine when the operation completes. (3) The RapidS serial interface provides up to 85MHz clock rate for high-speed continuous read operations across the entire memory array. The configurable page size (256 vs 264 bytes) allows compatibility with both binary-addressed and traditional DataFlash systems. The program/erase suspend/resume feature allows interrupting a long erase operation to read from a different sector, critical for real-time data logging applications.

Pin Description:AT45DB081E-SSHN2B-T Pin Definition and Functions

Pin	Name	Function
1	CS	Chip Select (active low)
2	SO	Serial Output (data out on falling SCK)
3	WP	Write Protect (sector protection enable)
4	VSS	Ground
5	SI	Serial Input (data in on rising SCK)
6	SCK	Serial Clock
7	RESET	Hardware Reset (active low)
8	VCC	Power Supply (1.7-3.6V)

Application Scenarios:In which products and applications isAT45DB081E-SSHN2B-T used

Digital voice recording and image storage with dual-buffer streaming
Embedded system firmware storage with 85MHz RapidS read
Industrial data acquisition with continuous write and suspend/resume
FPGA/CPLD configuration storage with sector protection
EEPROM emulation using buffer read-modify-write operation

Alternative Models:What chips are recommended as replacements for AT45DB081E-SSHN2B-T

Model	Manufacturer	Key Difference
AT45DB161E-SSHN2B-T	Renesas	16Mbit, same family
SST25PF020C-40I/SN	Microchip	2Mbit, standard SPI, no buffers
M25P80-VMN6P	Microchip	8Mbit, standard SPI, 75MHz
W25Q80DVSNIG	Winbond	8Mbit, standard SPI, 104MHz
S25FL801K0MFI041	Infineon	8Mbit, standard SPI, 104MHz