Renesas AT45DB081D-SSU-SL383

Overview

AT45DB081D-SSU-SL383 from Adesto Technologies is an 8-Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface, supporting up to 66 MHz clock frequency, 4,096 pages of 256/264-byte configurable page size, dual 256-/264-byte SRAM buffers, and industrial temperature operation. It enables high-speed code shadowing and EEPROM emulation in embedded firmware storage applications.

For engineers reviewing the AT45DB081D-SSU-SL383 datasheet, AT45DB081D-SSU-SL383 pinout, AT45DB081D-SSU-SL383 application, or AT45DB081D-SSU-SL383 equivalent, key selection considerations include its dual-buffered sequential read capability, hardware/software sector protection, 100,000 program/erase cycles, 20-year data retention, and SOIC-8 packaging with standard SPI pinout.

Technical Context

The AT45DB081D-SSU-SL383 implements a RapidS serial interface fully compatible with SPI Modes 0 and 3, enabling deterministic timing at up to 66 MHz for continuous array reads. Its memory architecture features hierarchical erase granularity-page (256 B), block (2 KB), sector (64 KB), and chip (8 Mbit)-with all operations self-timed and managed via status register polling.

Two independent 256-/264-byte SRAM buffers support concurrent data reception and Flash reprogramming, enabling seamless streaming writes without host intervention. Page size is factory-configurable to 256-byte (power-of-two) or 264-byte (DataFlash standard) mode, affecting address bit mapping (A19–A0 vs. PA11–PA0 + BA8–BA0) and buffer addressing (BFA7–BFA0 vs. BFA8–BFA0).

Key Specifications

Pinout & Package

AT45DB081D-SSU-SL383 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard SPI-compatible pin assignment and no exposed thermal pad. Pin functions are electrically defined and validated per Adesto datasheet 3596P–DFLASH–2/2014.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial Flash memory applications.

Compared with AT45DB081D-SSU-SL383, the W25Q80DVSSIG offers faster clock rates but no dual-buffer concurrency or automatic read wraparound, while the SST26VF064B provides greater capacity but omits hardware write protection and secure sector locking - making AT45DB081D-SSU-SL383 uniquely suited for resource-constrained, security-aware, streaming-data applications.

Availability

AT45DB081D-SSU-SL383 is available at Aetrix Electronics and suitable for firmware boot storage, industrial data logging, secure configuration storage, and audio/visual asset caching requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AT45DB081D-SSU-SL383 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Adesto Technologies (acquired by Dialog Semiconductor in 2020, now part of Renesas Electronics) specialized in low-power, high-reliability nonvolatile memory and IoT connectivity solutions.

The AT45DB081D belongs to the DataFlash® family, designed specifically for embedded systems needing SPI-based Flash with integrated SRAM buffers, flexible erase options, and hardware-enhanced security - targeting industrial, medical, and communications equipment.

FAQ

What is the maximum clock frequency supported by AT45DB081D-SSU-SL383 for continuous array reads?

The AT45DB081D-SSU-SL383 supports up to 66 MHz for Continuous Array Read using opcodes E8H and 0BH, as specified by fCAR1 in the datasheet. This applies to both 256-byte and 264-byte page configurations. The 03H low-frequency mode supports up to 33 MHz without dummy byte overhead. All modes maintain seamless page-boundary and end-of-array wraparound behavior.

Does AT45DB081D-SSU-SL383 require high-voltage programming or external charge pumps?

No, AT45DB081D-SSU-SL383 operates entirely from a single 2.5 V or 2.7 V to 3.6 V supply for all read, program, and erase operations. It contains no internal charge pump and does not require elevated voltages - simplifying power design and eliminating external HV circuitry. All programming and erase cycles are self-timed and managed internally.

How does the dual-buffer architecture of AT45DB081D-SSU-SL383 improve system performance?

The AT45DB081D-SSU-SL383 integrates two independent 256-/264-byte SRAM buffers that operate concurrently with main memory programming. This allows a host to stream new data into one buffer while the other buffer's contents are being written to Flash - eliminating idle time and enabling uninterrupted data acquisition or firmware updates without CPU intervention.

Can AT45DB081D-SSU-SL383 emulate EEPROM functionality at the byte level?

Yes, AT45DB081D-SSU-SL383 supports EEPROM emulation through a self-contained three-step read-modify-write operation using its SRAM buffers. While the underlying Flash requires page-level writes, the device abstracts this via buffer-managed atomic updates - enabling byte- or word-level alterations without external software wear-leveling, provided the host implements proper buffer management per the datasheet protocol.

What package type and lead finish does AT45DB081D-SSU-SL383 use?

AT45DB081D-SSU-SL383 uses an 8-pin SOIC (Small Outline Integrated Circuit) package with standard 150-mil body width and gull-wing leads. It is RoHS-compliant, halide-free, and lead (Pb)-free, meeting JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements. The "SSU" suffix explicitly denotes this SOIC-8 Green package variant.