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Microchip Technology AT25640AN-10SI-2.7-T
- Part No.:
- AT25640AN-10SI-2.7-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25640AN-10SI-2.7-T.pdf
- Description:
- IC EEPROM 64KBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,698
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Product details
Overview
AT25640AN-10SI-2.7-T from Microchip Technology (formerly Atmel) is a 64 Kbit SPI serial EEPROM organized as 8192 × 8-bit memory, supporting 20 MHz clock rate at 5V, 32-byte page write, and hardware/software write protection via WP pin and status register. It operates across 2.7V–5.5V supply and is qualified for industrial temperature range (−40°C to +85°C) in JEDEC SOIC-8 package.
For engineers reviewing the AT25640AN-10SI-2.7-T datasheet, AT25640AN-10SI-2.7-T pinout, AT25640AN-10SI-2.7-T application, or AT25640AN-10SI-2.7-T equivalent, key selection considerations include its 2.7V low-voltage operation, 1 million write endurance, 100-year data retention, block write protection granularity (1/4, 1/2, full array), and HOLD pin support for suspended serial communication.
Technical Context
The AT25640AN-10SI-2.7-T implements a synchronous SPI slave interface compliant with Modes 0 and 3, using separate SI/SO lines and requiring CS-driven op-code sequencing. Its internal architecture includes an 8-bit instruction register, nonvolatile status register (WPEN, BP1/BP0, WEN, RDY), and automatic address incrementing during read/write sequences.
It supports self-timed write cycles (≤5 ms), requires explicit WREN before WRITE, and provides dual-layer data protection: software-configurable block protection via WRSR and hardware-enforced inhibition when WP = low and WPEN = 1. The HOLD pin enables pause/resume of ongoing transfers without resetting the serial sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8-bit), enabling storage of firmware patches, calibration data, or device configuration in space-constrained systems. |
| Interface | SPI slave (Modes 0 and 3), compatible with 68HC11, PIC, ARM Cortex-M, and other microcontrollers with standard SPI peripherals. |
| Max Clock Rate | 20 MHz at VCC = 5.0V - delivers up to 2.5 MB/s effective serial throughput for rapid parameter updates. |
| Write Endurance | 1 million write cycles per memory location - supports frequent logging or counter applications over product lifetime. |
| Data Retention | 100 years at TA ≤ 85°C - ensures long-term reliability for unattended or maintenance-free deployments. |
| Supply Voltage | 2.7V to 5.5V - interoperable with 3.3V logic domains and backward-compatible with legacy 5V systems. |
| Operating Temp | −40°C to +85°C - certified for industrial control, automotive body electronics, and outdoor metering environments. |
Pinout & Package
AT25640AN-10SI-2.7-T is housed in an 8-lead JEDEC-standard SOIC (8S1) package: 0.150" wide, gull-wing leads, 1.27 mm pitch, body dimensions 4.80–5.00 mm × 3.81–3.99 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates op-code reception and places SO in high-impedance when deasserted. |
| SCK | Serial Clock | Input-only master-generated clock; timing-critical for setup/hold compliance (tSU/tH ≥ 25 ns @ 2.7V). |
| SI | Serial Data Input | Receives op-codes, addresses, and write data MSB-first; ignored during HOLD or write cycles. |
| SO | Serial Data Output | Drives read data MSB-first; enters high-Z state when CS high or during internal write (RDY = 1). |
| GND | Ground Reference | Return path for all I/O and power currents; must be low-impedance to minimize noise on SPI lines. |
| VCC | Power Supply | Single 2.7–5.5V rail; supplies core logic and I/O buffers; ISB2 = 0.3–2.0 µA standby current at 2.7V. |
| WP | Write Protect | Hardware lock: when WP = low and WPEN = 1, blocks all status register writes and protected memory writes. |
| HOLD | Communication Suspend | Pauses active SPI transfer (e.g., mid-read) without resetting address counter; resumes on rising edge while SCK = low. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte Page Write | Enables burst programming of up to 32 contiguous bytes per CS cycle, reducing total write time vs. byte-wise writes. |
| Four-Level Block Protection | Configurable via status register (BP1/BP0) to lock 0%, 25%, 50%, or 100% of memory - prevents accidental overwrite of critical firmware or calibration tables. |
| Write Enable Latch (WREN) | Separate volatile latch prevents unintended writes; must be set before each WRITE/WRSR command, automatically cleared post-write. |
| HOLD Pin Functionality | Allows host MCU to temporarily halt EEPROM communication (e.g., during interrupt servicing) without losing transaction context or address pointer. |
| Low-Voltage Operation | Guaranteed functionality down to 2.7V enables direct integration into battery-powered or energy-harvesting systems without level-shifting. |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Storing user-defined I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent settings across power cycles and firmware updates. Use Value: Enables field reconfiguration without hardware changes; 1M endurance supports daily parameter tuning over 10+ years. |
Use Scenario: Retaining seat position memory, mirror presets, and lighting profiles in automotive BCMs operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Dedicated EEPROM for user preference storage, isolated from main MCU flash to avoid wear-out during frequent updates. Use Value: Automotive-grade qualification and 100-year retention ensure settings survive vehicle lifetime without degradation. |
| Smart Energy Meter Calibration Data | Medical Infusion Pump Safety Parameters |
|
Use Scenario: Holding factory-calibrated ADC offset/gain coefficients and tariff tables in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, write-protected memory segment storing metrology-critical constants accessed at boot and runtime. Use Value: Block write protection (BP1/BP0 = 11) locks entire array against field corruption; WP pin adds hardware-level safeguard. |
Use Scenario: Storing drug library limits, dose safety interlocks, and audit logs in Class II medical infusion pumps requiring traceable parameter history. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory for regulatory-mandated safety-critical parameters with immutable versioning. Use Value: Dual protection (WRSR + WP) prevents unauthorized modification; 1M write cycles support full audit trail logging over device service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95640-DW | Same 64 Kbit density and SOIC-8 package, but rated for 5.5V max only (no 1.8V support); tWC = 5 ms typical, same 1M endurance. | Lacks 1.8V operation and extended temp grade variants; not qualified for −40°C to +125°C automotive use. | Select when design uses 3.3V/5V rails exclusively and does not require extended temperature or ultra-low-voltage capability. |
| 25AA640A-I/SN | Microchip's pin-compatible successor with identical pinout, 2.5V–5.5V range, and enhanced ESD rating (4 kV HBM); same 20 MHz speed and 32-byte page. | Offers improved robustness in noisy industrial environments; shares identical software interface and status register layout. | Prefer for new designs requiring higher ESD immunity or future-proofing; drop-in replacement with no firmware or layout changes. |
Compared with M95640-DW and 25AA640A-I/SN, the AT25640AN-10SI-2.7-T uniquely supports 2.7V–5.5V operation with industrial temperature rating and HOLD functionality - making it optimal for mixed-voltage embedded systems requiring communication suspension capability.
Availability
AT25640AN-10SI-2.7-T is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, smart metering, and medical device applications requiring stable component supply, long-term obsolescence management, and guaranteed traceable sourcing.
Supply support for AT25640AN-10SI-2.7-T 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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, acquired Atmel in 2016 and maintains full product support and documentation for the AT25xxx family.
The AT25640AN-10SI-2.7-T belongs to Microchip's legacy SPI EEPROM product line, designed specifically for reliable, low-power, nonvolatile data storage in resource-constrained embedded systems with stringent longevity and environmental requirements.
FAQ
What is the maximum clock frequency supported by the AT25640AN-10SI-2.7-T?
The AT25640AN-10SI-2.7-T supports up to 20 MHz SCK frequency when operated at VCC = 5.0V. At 2.7V, the maximum clock rate is reduced to 10 MHz per AC characteristics table. This ensures reliable timing margin across voltage and temperature ranges, with tWH/tWL minimums of 40 ns at 2.7V.
How does the WRITE PROTECT (WP) pin function on the AT25640AN-10SI-2.7-T?
The WP pin on the AT25640AN-10SI-2.7-T enables hardware write protection only when the WPEN bit in the status register is set to "1". When WP = low and WPEN = 1, writes to the status register and block-protected memory segments are inhibited. If WPEN = 0, the WP pin is disabled regardless of its logic level.
Can the AT25640AN-10SI-2.7-T perform page writes, and what is the page size?
Yes, the AT25640AN-10SI-2.7-T supports 32-byte page writes. After loading the WRITE op-code and starting address, up to 32 consecutive bytes can be transmitted in a single CS cycle. The internal address counter auto-increments the five LSBs, wrapping within the current page boundary.
What is the endurance and data retention specification for the AT25640AN-10SI-2.7-T?
The AT25640AN-10SI-2.7-T guarantees 1 million write/erase cycles per memory location and 100 years of data retention at temperatures up to +85°C. These specifications are validated per JEDEC standards and apply across the full industrial temperature range (−40°C to +85°C).
Does the AT25640AN-10SI-2.7-T support HOLD functionality, and how is it used?
Yes, the AT25640AN-10SI-2.7-T includes a HOLD pin that suspends ongoing SPI communication without resetting the internal address counter or command state. To pause, assert HOLD low while SCK is low; resume by returning HOLD high while SCK remains low - preserving transaction integrity during MCU interrupts.
AT25640AN-10SI-2.7-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25640AN-10SI-2.7-T FAQ
1.How can I place an order for AT25640AN-10SI-2.7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640AN-10SI-2.7-T 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 AT25640AN-10SI-2.7-T reliable?
The price and inventory of AT25640AN-10SI-2.7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25640AN-10SI-2.7-T is usually 5 days.
3.What payment methods are accepted for AT25640AN-10SI-2.7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640AN-10SI-2.7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640AN-10SI-2.7-T?
AT25640AN-10SI-2.7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640AN-10SI-2.7-T 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 AT25640AN-10SI-2.7-T?
For technical support, including AT25640AN-10SI-2.7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640AN-10SI-2.7-T requirements.
6.How does Aetrix verify that AT25640AN-10SI-2.7-T is sourced from the original manufacturer or authorized distributors?
All AT25640AN-10SI-2.7-T 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 AT25640AN-10SI-2.7-T meets industry standards.
7.What is the process for return or replacement of AT25640AN-10SI-2.7-T?
All AT25640AN-10SI-2.7-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25640AN-10SI-2.7-T, 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 AT25640AN-10SI-2.7-T part is unused and in its original packaging.
Return procedure for AT25640AN-10SI-2.7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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