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Renesas AT45DB642D-CNU
- Part No.:
- AT45DB642D-CNU
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN
- Datasheet:
-
AT45DB642D-CNU.pdf
- Description:
- IC FLASH 64MBIT SPI 66MHZ 8CASON
- Quantity:
- Payment:
- Shipping:
Inventory:2,379
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Product details
Overview
AT45DB642D-CNU from Microchip Technology is a 64-Mbit dual-interface DataFlash memory IC supporting both RapidS™ SPI-compatible serial (up to 66 MHz) and Rapid8™ 8-bit parallel (up to 50 MHz) interfaces, with configurable 1024- or 1056-byte pages, two 1024/1056-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 datasheet, AT45DB642D-CNU pinout, AT45DB642D-CNU application, or AT45DB642D-CNU equivalent, key selection considerations include dual-interface flexibility, page-level erase granularity, buffer-assisted streaming writes, hardware write protection (WP), and JEDEC-compliant ID read capability - all critical for robust, low-pin-count nonvolatile storage in DSP/microcontroller co-architectures.
Technical Context
The AT45DB642D-CNU implements a sequential-access Flash architecture organized as 8,192 pages of either 1024-byte (binary) or 1056-byte (standard DataFlash) size, with two independent SRAM buffers enabling concurrent data reception and Flash reprogramming. Its dual-interface control is managed via the SER/BYTE pin, selecting between SI/SO (SPI Mode 0/3) and I/O7–I/O0 (8-bit) paths without shared signal contention.
All program and erase operations are internally self-timed and require no external high-voltage supply; the device operates from a single 2.7V–3.6V rail. Sector-level hardware protection (via WP pin) and software-controlled sector lockdown coexist with a 128-byte security register containing 64-byte user-programmable space and unique 64-byte device identifier - supporting secure boot and firmware integrity verification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 64 Mbit (8,192 × 1024-byte or 1056-byte pages) - supports binary-aligned or standard DataFlash page addressing schemes. |
| Interface Options | RapidS™ SPI (66 MHz max, Modes 0/3) and Rapid8™ 8-bit parallel (50 MHz max) - selectable via SER/BYTE pin; no shared pins between modes. |
| Page Size Config | User-selectable 1024-byte (binary) or 1056-byte (standard); factory-preconfigurable - determines address bit mapping (A22–A0 vs PA12–PA0/BA10–BA0). |
| SRAM Buffers | Two independent 1024-/1056-byte buffers - enable simultaneous receive-to-buffer and buffer-to-Flash programming, eliminating write stalls during streaming. |
| Erase Granularity | Page (1 KB), Block (8 KB), Sector (256 KB), or Chip (64 Mbit) - allows precise wear leveling and partial firmware updates without full chip erase. |
| Power Consumption | 10 mA typical active read current (serial or 8-bit), 25 µA standby, 15 µA deep power-down - suitable for battery-backed or energy-sensitive applications. |
| Data Retention | 20 years minimum - validated under industrial temperature conditions; supports long-life deployment in unattended systems. |
Pinout & Package
AT45DB642D-CNU is packaged in a 28-pin TSOP-I (Type 1) with 0.55 mm pitch, RoHS-compliant and halide-free. Pin functions support dual-interface operation with hardware write protection and reset control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; falling edge initiates command sequence; rising edge terminates operation and places outputs in high-Z state. |
| SCK/CLK | Serial Clock / 8-bit Clock | Shared clock input for both interfaces; rising edge latches input data (SI or I/O7–I/O0); falling edge clocks out SO or I/O7–I/O0. |
| SI | Serial Input | Command, address, and data input for RapidS mode; ignored when SER/BYTE = low; must be NC if unused. |
| SO | Serial Output | Data output for RapidS mode; ignored when SER/BYTE = low; must be NC if unused. |
| I/O7–I/O0 | 8-bit Bidirectional Data Bus | Command/address/data I/O for Rapid8 mode; high-impedance when SER/BYTE = high; must be NC if unused. |
| WP | Hardware Write Protect | Active-low sector lock override; blocks all program/erase commands to protected sectors regardless of software settings. |
| RESET | Asynchronous Reset | Active-low; terminates ongoing operation and resets internal state machine; internal POR eliminates external RC requirement. |
| RDY/BUSY | Open-Drain Status Indicator | Low during self-timed operations (program/erase/buffer transfer); enables polling without command overhead. |
| SER/BYTE | Interface Selection | High = RapidS mode (SI/SO active); Low = Rapid8 mode (I/O7–I/O0 active); internally pulled high; defines pin functionality at power-up. |
| VCC / GND | Main Power Supply | 2.7V–3.6V core supply; GND is system reference for logic and Flash array. |
| VCCP / GNDP | 8-bit Interface Supply | Separate 2.7V–3.6V supply and ground for I/O7–I/O0; required only when SER/BYTE = low; otherwise NC. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Interface Flexibility | Enables simultaneous connection to DSP (via RapidS) and MCU (via Rapid8), or vice versa - simplifies heterogeneous processor architectures without glue logic. |
| Buffer-Assisted Streaming | Two independent SRAM buffers allow continuous data ingestion while Flash is being reprogrammed - essential for real-time audio/video buffering and firmware OTA updates. |
| Configurable Page Architecture | Supports both 1024-byte (binary-aligned) and 1056-byte (DataFlash-standard) page sizes - accommodates legacy EEPROM emulation and optimized sequential access use cases. |
| Hardware + Software Protection | Combines WP pin-based sector lock with programmable Sector Protection Register and permanent sector lockdown - meets secure boot and tamper-resistant firmware requirements. |
| Continuous Array Read | Legacy (E8H), High-Frequency (0BH), and Low-Frequency (03H) read modes enable seamless code shadowing with zero page-boundary latency - ideal for XIP-capable microcontrollers. |
Applications
| Firmware Storage | Audio Data Logging |
|---|---|
|
Use Scenario: Storing and updating bootloader and application firmware in industrial controllers with field-upgrade capability. IC Role / Device Role / Timing Role: Nonvolatile storage for executable code images; accessed via RapidS interface during boot and Rapid8 during update cycles. Use Value: Dual-interface isolation prevents bus contention during firmware swap; page/block erase enables atomic updates without interrupting runtime execution. |
Use Scenario: Capturing and replaying voice prompts or diagnostic audio streams in medical devices and smart meters. IC Role / Device Role / Timing Role: High-throughput sequential buffer for ADC-sampled audio; leverages Continuous Array Read for glitch-free playback. Use Value: 66 MHz RapidS read speed and zero-latency page-wrap ensure uninterrupted audio streaming; SRAM buffers absorb bursty capture timing. |
| Secure Boot Configuration | Embedded Data Recorder |
|
Use Scenario: Storing cryptographic keys, device identity, and signed firmware manifests in automotive ECUs and IoT gateways. IC Role / Device Role / Timing Role: Secure nonvolatile storage with hardware-locked sectors and unique device ID; accessed via SPI during secure boot validation. Use Value: 128-byte security register with 64-byte unique ID enables hardware-rooted trust chain; WP pin ensures immutable boot configuration. |
Use Scenario: Long-duration environmental sensor data logging in remote telemetry units with intermittent power. IC Role / Device Role / Timing Role: Low-power persistent storage for timestamped sensor readings; uses Deep Power-Down (15 µA) between sampling intervals. Use Value: 20-year data retention and 100,000 P/E cycles guarantee reliability over multi-year deployments; sector erase minimizes wear during cyclic logging. |
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 |
|---|---|---|---|
| AT45DB642D-SU | Same die and electrical specs; differs only in package - 8-contact SOIC (300 mil) instead of 28-pin TSOP-I. | Preferred for through-hole prototyping or space-constrained PCBs where SOIC footprint is acceptable. | Select AT45DB642D-SU when board layout favors SOIC mounting or when hand-soldering is required. |
| W25Q64JVSSIQ | Standard quad-SPI NOR Flash (64 Mbit); no 8-bit interface, no SRAM buffers, no page-size configurability. | Suitable for simple code storage but lacks concurrent streaming, hardware sector lock, or dual-interface flexibility. | Choose W25Q64JVSSIQ only if RapidS compatibility suffices and buffer-assisted streaming is unnecessary. |
Compared with AT45DB642D-SU, the AT45DB642D-CNU offers identical functionality in a surface-mount TSOP package optimized for automated assembly and higher-density layouts; versus W25Q64JVSSIQ, it delivers true dual-interface concurrency, on-the-fly buffering, and hardware-enforced security - making it superior for mixed-processor systems requiring deterministic data flow and firmware integrity.
Availability
AT45DB642D-CNU is available at Aetrix Electronics and suitable for firmware storage, audio data logging, secure boot configuration, and embedded data recording requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for AT45DB642D-CNU 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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog components, and nonvolatile memory solutions, with a focus on reliability, longevity, and embedded system integration.
The AT45DB642D-CNU belongs to Microchip's DataFlash family - designed specifically for high-density, low-pin-count, sequential-access Flash storage in systems where SPI simplicity and parallel throughput must coexist without compromising security or endurance.
FAQ
What interface modes does the AT45DB642D-CNU support, and how are they selected?
The AT45DB642D-CNU supports RapidS™ SPI (up to 66 MHz, Modes 0/3) and Rapid8™ 8-bit parallel (up to 50 MHz) interfaces. Selection is controlled by the SER/BYTE pin: high enables RapidS (SI/SO active), low enables Rapid8 (I/O7–I/O0 active). VCCP and GNDP must be powered only when using Rapid8. The AT45DB642D-CNU does not support simultaneous dual-interface operation - the SER/BYTE pin configures exclusive mode at power-up.
How does the AT45DB642D-CNU handle page size configuration, and why does it matter for addressing?
The AT45DB642D-CNU supports factory-configured 1024-byte (binary) or 1056-byte (standard DataFlash) pages. This directly affects address mapping: 1024-byte mode uses A22–A0 linear addressing, while 1056-byte mode uses separate PA12–PA0 (page) and BA10–BA0 (byte-in-page) fields. The AT45DB642D-CNU requires correct opcode and address format per mode - mismatched configuration causes read/write failures or misaligned data access.
Can the AT45DB642D-CNU perform read and write operations concurrently, and if so, how?
Yes - the AT45DB642D-CNU enables concurrent operations via its two independent SRAM buffers. While one buffer streams data into the device (e.g., via Rapid8), the other can be programmed into Flash (via Buffer-to-Main-Memory command), or vice versa. The AT45DB642D-CNU's RDY/BUSY pin indicates when the Flash array is busy, allowing host software to manage buffer transfers without stalling. This concurrency is fundamental to its use in real-time data acquisition.
What hardware and software mechanisms protect data on the AT45DB642D-CNU?
The AT45DB642D-CNU provides layered protection: hardware write protection via the active-low WP pin (overrides all software locks), software-controlled Sector Protection Register, and permanent Sector Lockdown for critical regions. It also includes a 128-byte Security Register with 64-byte user space and unique 64-byte Device ID. All protections are enforced independently per sector - the AT45DB642D-CNU ensures that even if software is compromised, WP-protected sectors remain immutable.
Is the AT45DB642D-CNU compatible with standard SPI controllers, and what clock modes does it support?
Yes - the AT45DB642D-CNU's RapidS interface is fully SPI-compatible and supports Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1) up to 66 MHz. It uses standard three-wire signaling (CS, SCK, SI/SO) with MSB-first transmission. Command opcodes, addresses, and data follow JEDEC conventions, and the AT45DB642D-CNU responds to standard Manufacturer/Device ID reads - ensuring drop-in compatibility with existing SPI firmware stacks.
AT45DB642D-CNU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VDFN
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 64Mbit
- Memory Organization:
- 1056 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 FAQ
1.How can I place an order for AT45DB642D-CNU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB642D-CNU 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 reliable?
The price and inventory of AT45DB642D-CNU 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 is usually 5 days.
3.What payment methods are accepted for AT45DB642D-CNU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB642D-CNU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB642D-CNU?
AT45DB642D-CNU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB642D-CNU 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?
For technical support, including AT45DB642D-CNU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB642D-CNU requirements.
6.How does Aetrix verify that AT45DB642D-CNU is sourced from the original manufacturer or authorized distributors?
All AT45DB642D-CNU 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 meets industry standards.
7.What is the process for return or replacement of AT45DB642D-CNU?
All AT45DB642D-CNU units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB642D-CNU, 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 part is unused and in its original packaging.
Return procedure for AT45DB642D-CNU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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