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Renesas AT45DB642D-CNU-SL954
- Part No.:
- AT45DB642D-CNU-SL954
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN
- Datasheet:
-
AT45DB642D-CNU-SL954.pdf
- Description:
- IC FLASH 64MBIT SPI 66MHZ 8CASON
- Quantity:
- Payment:
- Shipping:
Inventory:4,153
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Product details
Overview
AT45DB642D-CNU-SL954 from Adesto Technologies (now part of Dialog Semiconductor) is a 64-Mbit dual-interface DataFlash memory with RapidS™ serial (SPI Mode 0/3, up to 66 MHz) and Rapid8™ 8-bit parallel interfaces, 8,192 pages × 1,024/1,056 bytes, two 1,024/1,056-byte SRAM buffers, and industrial temperature range (–40°C to +85°C). It enables code shadowing, firmware storage, and data logging in resource-constrained embedded systems.
For engineers reviewing the AT45DB642D-CNU-SL954 datasheet, AT45DB642D-CNU-SL954 pinout, AT45DB642D-CNU-SL954 application, or AT45DB642D-CNU-SL954 equivalent, key selection criteria include dual-interface flexibility, page-level erase granularity, buffer-assisted streaming writes, low-power standby (15 µA deep power-down), and hardware/software sector protection for secure firmware updates.
Technical Context
The AT45DB642D-CNU-SL954 implements a sequential-access Flash architecture with no address bus - data is accessed via command-opcode sequences over either SPI or 8-bit parallel interface. Its memory is organized into 8,192 pages (1,024- or 1,056-byte configurable), grouped into 32 sectors of 256 pages each (except Sector 0), supporting page (1 KB), block (8 KB), sector (256 KB), and chip (64 Mbit) erase operations.
Two independent SRAM buffers enable concurrent data reception (via SI or I/O7–I/O0) while reprogramming Flash - critical for uninterrupted streaming in voice recording or real-time telemetry. The SER/BYTE pin selects interface mode at power-up or runtime (CS high, RDY/BUSY low), and all program/erase cycles are fully self-timed with RDY/BUSY open-drain status signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 64 Mbit (8,192 × 1,024-byte or 1,056-byte pages) - supports binary-aligned or standard DataFlash page sizing for compatibility with legacy firmware tools. |
| Interface Options | RapidS™ SPI (Mode 0/3, up to 66 MHz) and Rapid8™ 8-bit parallel (up to 50 MHz) - enables simultaneous connection to DSP (serial) and MCU (parallel) without arbitration logic. |
| SRAM Buffers | Two 1,024/1,056-byte buffers - allow full-duplex operation: receive new data into one buffer while programming Flash from the other, eliminating write stalls. |
| Erase Granularity | Page (1 KB), block (8 KB), sector (256 KB), chip (64 Mbit) - permits fine-grained wear leveling and partial firmware updates without full chip erase. |
| Power Consumption | 10 mA active read (typical), 25 µA standby, 15 µA deep power-down - suitable for battery-backed data loggers and always-on IoT edge nodes. |
| Data Retention & Endurance | 20 years retention; ≥100,000 program/erase cycles per page - validated for long-life industrial control firmware storage and cyclic data buffering. |
| Security Features | 128-byte security register (64-byte user-programmable + 64-byte unique device ID); permanent sector lockdown - enables secure boot partitioning and anti-cloning in certified devices. |
Pinout & Package
AT45DB642D-CNU-SL954 is packaged in a 28-pin TSOP-I (Type 1) with 0.55 mm pitch, RoHS-compliant, green (Pb/halide-free) finish. Pin functions support dual-interface operation with hardware-selectable mode via SER/BYTE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; falling edge initiates command sequence; rising edge terminates operation and triggers self-timed execution (e.g., page program). |
| SCK/CLK | Serial Clock / Parallel Clock | Shared clock input for both interfaces; rising edge latches SI or I/O7–I/O0 data; falling edge clocks SO or I/O7–I/O0 output - eliminates need for separate clock domains. |
| SI | Serial Input | Command, address, and data input for RapidS mode; must be NC when SER/BYTE = low (8-bit mode active). |
| SO | Serial Output | Data output for RapidS mode; high-impedance when SER/BYTE = low - prevents bus contention during parallel operation. |
| I/O7–I/O0 | 8-bit Bidirectional Data Bus | Full-duplex data path for Rapid8 mode; tri-stated when SER/BYTE = high - enables shared PCB routing with microcontroller data bus. |
| WP | Hardware Write Protect | Active-low global lock; overrides software protection - ensures critical sectors (e.g., bootloader) remain immutable during field firmware updates. |
| RDY/BUSY | Open-Drain Status Indicator | Low during self-timed operations (program/erase/buffer transfer); used for polling or interrupt-driven flow control without command overhead. |
| SER/BYTE | Interface Mode Select | High = RapidS only (SI/SO active); low = Rapid8 only (I/O7–I/O0 active); internal pull-up allows single-interface default without external bias. |
| VCC / GND | Core Power Supply | 2.7V–3.6V single supply; no high-voltage programming required - simplifies power design and eliminates charge pumps. |
| VCCP / GNDP | 8-bit I/O Power Domain | Separate 2.7V–3.6V supply for I/O7–I/O0; isolated from core VCC - supports mixed-voltage system interfacing (e.g., 3.3V core / 1.8V I/O). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-interface concurrency | Independent RapidS and Rapid8 ports allow simultaneous host access - e.g., DSP streams audio to buffer while MCU manages Flash page writes. |
| Configurable page size | Factory-set 1,024-byte (binary) or 1,056-byte (standard DataFlash) pages - ensures compatibility with existing bootloader code and file-system drivers. |
| Continuous array read | Legacy (E8H) and high-speed (0BH) modes support seamless wraparound reads across page boundaries - essential for code shadowing without CPU intervention. |
| Buffer-assisted streaming | Two SRAM buffers enable pipelined writes: fill Buffer 1 while Buffer 2 programs Flash, then swap - achieves sustained write throughput >2 MB/s (at 66 MHz SCK). |
| Hardware + software protection | WP pin + Sector Protection Register + permanent lockdown - provides layered security for bootloader, calibration data, and cryptographic keys in medical/industrial devices. |
Applications
| Voice Recording System | Firmware Update Module |
|---|---|
|
Use Scenario: Continuous digitized audio capture from microphone ADC at 16 kHz/16-bit, stored for later playback or upload. IC Role / Device Role / Timing Role: High-reliability, low-power nonvolatile buffer with seamless streaming write capability using dual SRAM buffers and Rapid8 interface to MCU. Use Value: Eliminates write latency gaps via concurrent buffer fill/program; 15 µA deep power-down extends battery life in portable recorders beyond 6 months. |
Use Scenario: In-field firmware update for industrial PLC where new application code must be verified before activation. IC Role / Device Role / Timing Role: Dual-interface Flash storing active firmware (sector-locked) and pending update (unlocked), accessed via SPI by bootloader and parallel bus by application processor. Use Value: Sector lockdown prevents accidental overwrite of running code; page-erase granularity enables atomic 4 KB patch updates without full image reload. |
| Telemetry Data Logger | Medical Sensor Hub |
|
Use Scenario: Hourly environmental sensor readings (temperature, humidity, pressure) logged for 30 days in remote monitoring node. IC Role / Device Role / Timing Role: Wear-leveling-capable Flash with 100,000-cycle endurance, managed via MCU using page-erase and buffer-to-memory programming. Use Value: Page-level erase minimizes write amplification; 20-year data retention guarantees integrity of long-term clinical or compliance records. |
Use Scenario: ECG/SpO₂ sensor module requiring secure storage of calibration coefficients and patient-specific configuration. IC Role / Device Role / Timing Role: Secure nonvolatile memory with 128-byte security register, unique device ID, and permanent sector lockdown for regulatory compliance (IEC 62304). Use Value: Prevents tampering with FDA-cleared calibration data; hardware WP pin ensures immunity to software faults during power transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-interface Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q64JVSSIQ | Single SPI interface only (no 8-bit parallel port); 64 Mbit Quad SPI with DTR support; no SRAM buffers or continuous array read. | Lacks dual-interface flexibility and streaming write acceleration; requires external buffering logic for high-throughput logging. | Select when cost-sensitive designs prioritize SPI simplicity and quad I/O speed over concurrent host access. |
| Macronix MX25L6433FZNI-10G | Single SPI interface; 64 Mbit with 4-KB uniform sectors; no SRAM buffers; supports SFDP but no rapid-read wraparound mode. | No hardware-accelerated streaming; relies on software-managed wear leveling; unsuitable for real-time code shadowing. | Choose for legacy SPI-only systems needing JEDEC-standard command set and broad distributor availability. |
Compared with W25Q64JVSSIQ and MX25L6433FZNI-10G, the AT45DB642D-CNU-SL954 uniquely delivers true dual-host concurrency, built-in streaming acceleration via dual buffers, and continuous read with zero page-boundary latency - making it irreplaceable in deterministic real-time firmware and audio applications.
Availability
AT45DB642D-CNU-SL954 is available at Aetrix Electronics and suitable for industrial control firmware storage, portable voice recording systems, and medical sensor data logging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DB642D-CNU-SL954 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, specialized in low-power, high-reliability nonvolatile memory and IoT connectivity solutions for industrial and medical markets.
The AT45DB642D-CNU-SL954 belongs to the DataFlash® family - engineered specifically for sequential-access applications demanding low pin count, deterministic streaming, and secure firmware/data storage in space- and power-constrained environments.
FAQ
What interface modes does the AT45DB642D-CNU-SL954 support, and how is mode selection implemented?
The AT45DB642D-CNU-SL954 supports RapidS™ SPI (up to 66 MHz, Mode 0/3 compatible) and Rapid8™ 8-bit parallel (up to 50 MHz) interfaces. Mode selection is controlled by the SER/BYTE pin: high enables SPI (SI/SO active, I/O7–I/O0 high-Z), low enables 8-bit mode (I/O7–I/O0 active, SO high-Z). The pin has an internal pull-up, so unconnected defaults to SPI mode. Switching requires CS high and RDY/BUSY low.
How does the AT45DB642D-CNU-SL954 handle page size configuration, and what impact does it have on addressing?
The AT45DB642D-CNU-SL954 supports factory-configured 1,024-byte (binary) or 1,056-byte (standard DataFlash) pages. Binary mode uses A22–A0 addressing (10-bit buffer, 13-bit page); standard mode uses PA12–PA0 + BA10–BA0 (11-bit buffer, 13-bit page). Opcodes and command timing differ slightly between modes - e.g., Continuous Array Read (E8H) requires different dummy byte counts - and must be matched to the configured page size.
What is the role of the two SRAM buffers in the AT45DB642D-CNU-SL954, and how do they improve system performance?
The AT45DB642D-CNU-SL954 integrates two independent 1,024/1,056-byte SRAM buffers that decouple data ingestion from Flash programming. While one buffer receives incoming data (via SI or I/O7–I/O0), the other can simultaneously program its contents to Flash - enabling uninterrupted streaming in voice recorders or telemetry loggers. This eliminates write stalls and sustains effective throughput near interface bandwidth limits.
Does the AT45DB642D-CNU-SL954 support hardware write protection, and how does it interact with software-based sector protection?
Yes, the AT45DB642D-CNU-SL954 features a dedicated active-low WP pin that globally disables program/erase operations on protected sectors - overriding all software commands except Enable Sector Protection and Sector Lockdown. Software protection is managed via the Sector Protection Register and offers granular per-sector control, while WP provides fail-safe physical lockdown. Both mechanisms coexist and are commonly used together for bootloader security.
What are the key timing characteristics for continuous read operations on the AT45DB642D-CNU-SL954?
The AT45DB642D-CNU-SL954 supports three continuous read modes: Legacy (E8H, up to 66 MHz), High-Frequency (0BH, up to 66 MHz, requires dummy byte), and Low-Frequency (03H, up to 33 MHz, no dummy byte). All modes auto-increment the internal address counter across page boundaries with zero latency, and wrap seamlessly from end-of-array to start-of-array. Maximum SCK frequency is governed by fCAR1 (66 MHz) or fCAR2 (33 MHz) depending on mode.
AT45DB642D-CNU-SL954 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VDFN
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 64Mbit
- Memory Organization:
- 1K Bytes x 8192 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 66 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-CASON (6x8)
AT45DB642D-CNU-SL954 FAQ
1.How can I place an order for AT45DB642D-CNU-SL954 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB642D-CNU-SL954 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT45DB642D-CNU-SL954 reliable?
The price and inventory of AT45DB642D-CNU-SL954 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB642D-CNU-SL954 is usually 5 days.
3.What payment methods are accepted for AT45DB642D-CNU-SL954?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB642D-CNU-SL954 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB642D-CNU-SL954?
AT45DB642D-CNU-SL954 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB642D-CNU-SL954 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT45DB642D-CNU-SL954?
For technical support, including AT45DB642D-CNU-SL954 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB642D-CNU-SL954 requirements.
6.How does Aetrix verify that AT45DB642D-CNU-SL954 is sourced from the original manufacturer or authorized distributors?
All AT45DB642D-CNU-SL954 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT45DB642D-CNU-SL954 meets industry standards.
7.What is the process for return or replacement of AT45DB642D-CNU-SL954?
All AT45DB642D-CNU-SL954 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB642D-CNU-SL954, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT45DB642D-CNU-SL954 part is unused and in its original packaging.
Return procedure for AT45DB642D-CNU-SL954:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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