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Microchip Technology AT45DB642-TI
- Part No.:
- AT45DB642-TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT45DB642-TI.pdf
- Description:
- IC FLASH 64MBIT PARALLEL 40TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,555
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Product details
Overview
AT45DB642-TI from Microchip Technology (formerly Atmel) is a 64-Mbit, 2.7V–3.6V dual-interface DataFlash memory IC with SPI and parallel I/O interfaces, 8192 × 1056-byte pages, two 1056-byte SRAM buffers, and hardware write protection - used for code shadowing, firmware storage, and embedded data logging in resource-constrained systems.
For engineers reviewing the AT45DB642-TI datasheet, AT45DB642-TI pinout, AT45DB642-TI application, or AT45DB642-TI equivalent, key selection considerations include dual-interface flexibility, continuous array read capability, buffer-assisted concurrent load/reprogram operation, and industrial temperature support without high-voltage programming.
Technical Context
The AT45DB642-TI implements a dual-path architecture: one dedicated serial interface (SPI Modes 0/3, up to 20 MHz) and one optional parallel I/O interface (up to 5 MHz), sharing SCK/CLK and controlled by SER/PAR pin logic. Its memory is organized as 8192 pages of 1056 bytes each (69,206,016 bits total), plus two independent 1056-byte SRAM buffers enabling simultaneous data reception and flash reprogramming.
Page-level erase-and-program operations are self-timed with no external high-voltage supply required; hardware page write protection (WP) and RDY/BUSY status reporting via pin or status register bit 7 ensure robust system-level control. The device supports continuous array read with automatic address wraparound and burst read with synchronous delay across page boundaries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Mbit (69,206,016 bits), organized as 8192 pages × 1056 bytes |
| Supply Voltage | 2.7V–3.6V single supply - eliminates need for charge pumps or auxiliary rails |
| Serial Interface Speed | Up to 20 MHz - enables fast firmware updates over SPI |
| Parallel Interface Speed | Up to 5 MHz - supports microcontroller co-processor access with low latency |
| Active Read Current | 4 mA typical - reduces power budget in always-on embedded systems |
| Standby Current | 2 µA typical - suitable for battery-backed or energy-harvested applications |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade deployment |
Pinout & Package
AT45DB642-TI is housed in a 44-pin TSOP-I (Type 1) package with exposed pad, compatible with standard surface-mount assembly processes and thermal management requirements for industrial flash memory.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for serial or parallel command initiation; must remain low during full instruction sequence |
| SCK/CLK | Shared Clock Input | Single clock pin serving both serial (SCK) and parallel (CLK) modes; toggled to shift opcodes, addresses, and data |
| SI | Serial Input | Data input path during serial mode; ignored when SER/PAR = low |
| SO | Serial Output | Data output path during serial read; tri-stated when SER/PAR = low |
| I/O7–I/O0 | Parallel I/O Bus | 8-bit bidirectional data bus active only when SER/PAR = low; high-impedance otherwise |
| WP | Hardware Write Protect | Active-low pin disabling page program and erase commands - prevents accidental firmware corruption |
| RESET | Chip Reset | Asynchronous reset that clears internal state and terminates ongoing operations |
| RDY/BUSY | Status Output | Open-drain signal indicating busy state (low) during erase/program/transfer; complements status register bit 7 |
| SER/PAR | Interface Mode Control | High = serial mode (SI/SO active); low = parallel mode (I/O7–I/O0 active); must be stable before CS assertion |
Key Features
| Feature | Design Value |
|---|---|
| Dual-interface architecture | Enables concurrent connection to DSP (via SPI) and MCU (via parallel I/O), eliminating interface arbitration logic |
| Two 1056-byte SRAM buffers | Allow streaming data ingestion into one buffer while reprogramming flash from the other - critical for real-time logging |
| Continuous Array Read | Supports uninterrupted code shadowing from flash to RAM without address retransmission or page boundary delays |
| Self-timed page program with built-in erase | Eliminates external timing control and high-voltage circuitry - simplifies BOM and layout for field-upgradable systems |
| Hardware page write protection | Prevents unintended modification of boot code or calibration data without software intervention or fuse blowing |
Applications
| Industrial Firmware Storage | Audio Voice Recording |
|---|---|
Use Scenario: Storing and updating bootloader and application firmware in programmable logic controllers (PLCs) and motor drives. IC Role / Device Role / Timing Role: Nonvolatile firmware repository with in-system reprogrammability and hardware write lock for safety-critical updates. Use Value: Enables secure, field-deployable firmware patches without requiring external programming hardware or voltage boosters. | Use Scenario: Capturing and replaying voice prompts or alarm tones in medical devices and building automation panels. IC Role / Device Role / Timing Role: Sequential-access audio buffer supporting continuous read at variable bitrates without CPU overhead. Use Value: Delivers deterministic playback latency and eliminates DRAM dependency for short-duration voice clips. |
| Embedded Data Logging | Code Shadowing in DSP Systems |
Use Scenario: Recording sensor telemetry (temperature, pressure, vibration) in predictive maintenance gateways operating on intermittent power. IC Role / Device Role / Timing Role: High-endurance, low-power flash memory with dual-buffer streaming to sustain burst writes during wake cycles. Use Value: Achieves >100k page erase/program cycles per sector while maintaining 2 µA standby current for multi-year battery life. | Use Scenario: Loading executable code from flash into DSP on-chip RAM for real-time signal processing tasks. IC Role / Device Role / Timing Role: High-speed sequential memory source optimized for continuous array read with automatic page-wrap addressing. Use Value: Reduces boot time by 40% vs. conventional NOR flash due to elimination of address setup overhead per page. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB642D-TI | Same density and pinout; updated revision with enhanced ESD tolerance and tighter tEP max specification (20 ms vs. 25 ms) | Preferred for new designs requiring extended reliability in noisy industrial environments | Select AT45DB642D-TI if long-term product continuity and improved surge immunity are required. |
| W25Q64JVSSIQ | 64-Mbit SPI-only NOR flash; no parallel interface or SRAM buffers; supports Quad SPI and faster 104 MHz DTR mode | Better suited for high-throughput code execution but lacks concurrent load/reprogram capability | Choose W25Q64JVSSIQ when maximizing read speed and minimizing pin count outweigh dual-interface flexibility. |
Compared with AT45DB642-TI, AT45DB642D-TI offers minor reliability enhancements without layout changes, while W25Q64JVSSIQ trades dual-interface concurrency for higher serial bandwidth and broader ecosystem support - making it ideal for cost-sensitive, SPI-only applications where buffer-assisted streaming is unnecessary.
Availability
AT45DB642-TI is available at Aetrix Electronics and suitable for industrial firmware storage, embedded data logging, audio voice recording, and code shadowing applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for AT45DB642-TI 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 devices, and memory solutions, with a strong heritage in embedded Flash technology through its acquisition of Atmel.
The AT45DB642-TI belongs to the DataFlash® family - designed specifically for systems needing sequential-access, low-pin-count, dual-interface nonvolatile memory with integrated buffering to simplify firmware update and real-time data capture architectures.
FAQ
What is the primary function of the AT45DB642-TI in an embedded system?
The AT45DB642-TI serves as a dual-interface (SPI + parallel) Flash memory IC optimized for sequential data access, firmware storage, and real-time logging. Its two 1056-byte SRAM buffers allow concurrent data loading and flash reprogramming - a key capability not found in standard SPI NOR devices. This makes AT45DB642-TI especially valuable in systems like PLCs and medical recorders where deterministic throughput and in-field upgradability are essential.
Does the AT45DB642-TI require a high-voltage programming supply?
No, the AT45DB642-TI operates entirely from a single 2.7V–3.6V supply for both read and program operations. All erase-and-program cycles are self-timed and internally generated - eliminating the need for external charge pumps, VPP pins, or high-voltage programming circuits. This simplifies power design and improves reliability in AT45DB642-TI-based systems.
How does the SER/PAR pin affect interface selection on the AT45DB642-TI?
The SER/PAR pin on the AT45DB642-TI determines active interface mode: high = serial (SI/SO enabled, I/O7–I/O0 high-Z); low = parallel (I/O7–I/O0 enabled, SO high-Z). Mode switching requires CS to be high during transition and adherence to SER/PAR setup/hold timing. This pin enables flexible system integration - for example, connecting AT45DB642-TI to both a DSP (serial) and MCU (parallel) simultaneously.
Can the AT45DB642-TI perform true byte-level writes like EEPROM?
No, the AT45DB642-TI is a page-erasable Flash device and does not support true byte-alterability. However, it provides EEPROM emulation via a three-step Read-Modify-Write sequence using its SRAM buffers - allowing logical byte updates at the software level. This method preserves endurance and avoids wear-leveling complexity, but actual physical writes still occur at 1056-byte page granularity in AT45DB642-TI.
What is the maximum clock frequency supported by the AT45DB642-TI's parallel interface?
The AT45DB642-TI supports a maximum clock frequency of 5 MHz on its parallel interface (CLK pin), which is shared with the serial SCK pin. This frequency enables efficient data transfer between microcontrollers and the device's 8-bit I/O bus (I/O7–I/O0), particularly useful in applications requiring low-latency access without full SPI protocol overhead - a distinct advantage of AT45DB642-TI over SPI-only alternatives.
AT45DB642-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-TFSOP (0.724", 18.40mm Width)
- 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:
- Parallel, SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TSOP
AT45DB642-TI FAQ
1.How can I place an order for AT45DB642-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB642-TI 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 AT45DB642-TI reliable?
The price and inventory of AT45DB642-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB642-TI is usually 5 days.
3.What payment methods are accepted for AT45DB642-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB642-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB642-TI?
AT45DB642-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB642-TI 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 AT45DB642-TI?
For technical support, including AT45DB642-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB642-TI requirements.
6.How does Aetrix verify that AT45DB642-TI is sourced from the original manufacturer or authorized distributors?
All AT45DB642-TI 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 AT45DB642-TI meets industry standards.
7.What is the process for return or replacement of AT45DB642-TI?
All AT45DB642-TI units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB642-TI, 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 AT45DB642-TI part is unused and in its original packaging.
Return procedure for AT45DB642-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB642-TI Tags
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