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AT45DB642D-CNU
AT45DB642D-CNU
| Part Number | AT45DB642D-CNU |
|---|---|
| Manufacturer | Atmel (Acquired by Microchip, DataFlash Series Transferred to Adesto Technologies, later Adesto purchased by Renesas Electronics) |
| Category | Integrated Circuits (ICs) > Memory > Flash Memory > DataFlash Serial Flash |
| Description | 64-Megabit 2.7V minimum dual-interface DataFlash memory with two independent 1024/1056-byte SRAM data buffers, RapidS SPI + Rapid8 8-bit parallel dual interface, flexible page/block/sector erase options, packaged in compact 8-CASON (6×8mm) SMD package. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
The AT45DB642D-CNU is a 64Mb industrial DataFlash memory originally developed by Atmel, now under Renesas’ product line via Adesto acquisition.
It features dual on-chip SRAM buffers to enable read-while-write operation and supports dual interfaces: 66MHz RapidS SPI and 50MHz Rapid8 8-bit parallel bus.
Users may switch between 1024-byte binary page layout or native 1056-byte format with spare ECC/metadata space.
Operating on a single 2.7V–3.6V supply, it delivers 100,000 program/erase cycles per page and 20-year data retention.
The compact 8-CASON (6×8mm) SMD package fits portable, industrial and IoT embedded devices for firmware storage, data logging, audio & image recording.
Core Advantages
Advanced Dual-SRAM Data Buffers
Two independent on-chip SRAM buffers support simultaneous read and page programming, eliminating host wait states and boosting continuous streaming throughput for data loggers and audio recorders.
Dual Selectable Page Size Architecture
User-configurable page modes: 1056-byte native DataFlash format with 32 spare bytes per page for security metadata/ECC, or 1024-byte power-of-two binary layout compatible with standard FAT file systems.
Dual High-Speed Interface (SPI + Rapid8)
RapidS SPI interface up to 66MHz (SPI Mode 0/3) plus Rapid8 8-bit parallel bus up to 50MHz, offering flexible connection to MCU, DSP or FPGA for high-bandwidth data streaming.
Ultra-Compact 8-CASON Small Form Factor
8-pin CASON (6×8mm) low-profile SMD package minimizes PCB footprint, ideal for handheld devices, wearables and mini industrial sensors.
Key Specifications
| Brand | Atmel / Adesto DataFlash® High-Performance Serial Memory Series (Renesas Legacy Line) |
|---|---|
| RoHS Status | RoHS Compliant / Lead-Free / Halogen-Free Green Construction |
| EDA/CAD Model | 3D STEP Models, Schematic Symbols, PCB footprints available upon request |
| Warranty | 1-Year Standard Quality Warranty |
| Package / Case | 8-CASON (8-VDFN 6×8mm) |
| Mounting Type | Surface Mount Technology (SMD Reflow Assembly) |
| Moisture Sensitivity Level | MSL 3, 168 Hours floor life at 30°C / 60% RH |
| Surface Marking / Silkscreen | 45DB642D-CNU Marking |
| Memory Density | 64 Megabit (64Mb) non-volatile flash storage |
| Memory Page Organization | 8,192 pages; each page configurable to 1024 Bytes (binary) or 1056 Bytes (standard DataFlash) |
| Max SPI Clock Frequency | 66 MHz RapidS SPI interface; Rapid8 parallel interface up to 50 MHz |
| On-Chip SRAM Buffers | 2 independent data buffers (1024 / 1056 Bytes matching page size setting) |
| Erase Granularity | Page Erase, 8KB Block Erase, 256KB Sector Erase, Full Chip Erase supported |
| Page Program Typical Time | 6 ms typical page programming cycle |
| Program/Erase Endurance | Minimum 100,000 cycles per page; 20-year minimum data retention at industrial temp range |
| Security Module | 128-byte dedicated security register with 64-bit unique factory-programmed device ID, sector lock protection |
| Low Power Current Spec | 10mA typical active read current; 25µA standby supply current; 15µA deep power-down mode current |
| Operating Voltage Supply (Vcc) | 2.7V to 3.6V single supply for read, program and erase operations |
| Operating Temperature Range | -40°C to +85°C Industrial Grade certified |
| Brand Line | Adesto Atmel DataFlash® Serial NOR Flash Memory |
| Data Read Speed | Max 33MB/s sequential continuous read throughput |
| Communication Mode | SPI Mode 0 & Mode 3 supported for serial interface |
Typical Applications
- Digital Voice Recorders, Audio Playback Devices & Voice Prompt Modules
- Industrial Data Loggers, Environmental Monitoring Sensors & Telemetry Equipment
- Embedded Firmware Storage for Routers, Set-Top Boxes & Small Network Nodes
- Portable Medical Instruments, Handheld GPS & Wearable IoT Tracking Devices
- Smart Energy Meters, POS Terminals & Portable Automated Test Equipment
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Shipping Time | Shipped within 1-2 business days |
| Delivery Time | 3-7 working days worldwide |
| Shipping Methods | DHL, UPS, FedEx, EMS |
| Payment Methods | T/T (Bank Transfer), PayPal, Credit Card, Western Union |
Technical Support
For datasheet download, free sample requests, stock verification or bulk volume pricing, submit the inquiry form on this page. Our memory specialist team will reply within 24 working hours.
Frequently Asked Questions
Q1: Is your AT45DB642D-CNU stock genuine original factory components?
A: All AT45DB642D-CNU memory chips in our inventory are brand-new original surplus factory stock. All batches pass strict incoming ESD inspection and stored in moisture-barrier trays to prevent oxidation and pin damage during transit.
Q2: What core advantage does DataFlash architecture have over standard SPI NOR Flash?
A: Ordinary serial Flash requires full block/sector erase before writing new data, forcing the host MCU to manage large external cache. AT45DB642D integrates dual SRAM buffers to support independent page programming while reading other data, simplifying firmware and lowering system processing load.
Q3: Why does this chip offer two switchable page sizes (1024 / 1056 bytes)?
A: The native 1056-byte page reserves 32 spare bytes per page for ECC error correction, security keys and log markers. The 1024-byte binary mode can be locked via software command to match standard file system byte alignment for easier software porting.
Q4: How can I get official datasheets, programming guides or large volume discount quotes?
A: Fill out the quick inquiry form with your project specifications and required order quantity. Our memory technical support team will send complete datasheets, programming reference documents and customized bulk pricing within 24 hours.
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