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Microchip Technology AT25640-10PI-2.7
- Part No.:
- AT25640-10PI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25640-10PI-2.7.pdf
- Description:
- IC EEPROM 64KBIT SPI 3MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,005
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Product details
Overview
AT25640-10PI-2.7 from Atmel (now Microchip) is a 64 Kbit SPI serial EEPROM organized as 8192 × 8-bit memory, operating from 2.7V to 5.5V with 3.0 MHz max clock rate at 5V, 32-byte page write capability, and hardware/software write protection via WP pin and status register. It targets industrial control systems requiring nonvolatile parameter storage with low-voltage compatibility and high reliability.
For engineers reviewing the AT25640-10PI-2.7 datasheet, AT25640-10PI-2.7 pinout, AT25640-10PI-2.7 application, or AT25640-10PI-2.7 equivalent, key selection criteria include its 2.7–5.5 V supply range, 5 ms typical write cycle time, 1 million endurance cycles, 100-year data retention, and support for SPI Modes 0 and 3 in an 8-lead PDIP package.
Technical Context
The AT25640-10PI-2.7 functions as a slave SPI peripheral with separate SI (input) and SO (output) pins, supporting MSB-first transmission and requiring WREN before WRITE. Its internal architecture includes an 8-bit instruction register and nonvolatile status register with BP0/BP1 bits enabling 1/4, 1/2, or full-array block write protection.
It features dual-level data protection: hardware-based via the WP pin (when WPEN = 1) and software-based via Write Enable Latch control and RDSR/WRSR instructions. The HOLD pin allows pausing ongoing serial transfers without resetting the sequence, and all programming cycles are self-timed with no erase step required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8-bit array), sufficient for firmware configuration tables or calibration data in embedded controllers. |
| Supply Voltage | 2.7V to 5.5V - supports direct interface with 3.3V and 5V microcontrollers without level-shifting. |
| Max Clock Rate | 3.0 MHz at VCC = 5.0V - enables fast parameter reads/writes in time-critical applications like motor control startup sequences. |
| Page Write Size | 32 bytes - minimizes write latency when updating multi-byte records such as sensor offset registers. |
| Write Cycle Time | 5 ms typical - defines minimum interval between successive write commands; impacts real-time logging throughput. |
| Endurance | 1 million write cycles - ensures >10 years of daily 300-write operations in industrial logging applications. |
| Data Retention | 100 years at 25°C - guarantees long-term validity of stored calibration or security keys without refresh. |
Pinout & Package
AT25640-10PI-2.7 uses an 8-lead PDIP (8P3) package: 0.300" wide body, through-hole mounting, RoHS-compliant lead finish. Pin 1 is CS (Chip Select), pin 8 is VCC, and pin 4 is GND - standard layout compatible with legacy PCB footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: drives device into active state only when low; high-impedance SO during CS high prevents bus contention. |
| SCK | Serial Clock | Master-generated clock synchronizing all SI/SO data transfers; must be low during HOLD assertion to pause communication. |
| SI | Serial Data Input | Receives op-codes (e.g., WREN, WRITE), addresses, and data; ignored during HOLD or when CS is high. |
| SO | Serial Data Output | Drives read data and status bits; enters high-impedance state when CS is high or during internal write cycles. |
| WP | Write Protect | Hardware lock: when low and WPEN=1, blocks writes to status register and protected memory blocks - critical for field-upgrade safety. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting address counter - enables priority interrupt handling in multitasking firmware. |
| GND | Ground Reference | Return path for VCC and all I/O signals; requires low-impedance connection to minimize noise-induced read errors. |
| VCC | Power Supply | 2.7–5.5V input powering core logic and I/O buffers; decoupling capacitor (0.1 µF) required within 10 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode Compatibility | Supports Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1) - interoperable with diverse MCU families including PIC, AVR, and ARM Cortex-M. |
| Block Write Protection | Configurable 1/4, 1/2, or full-array protection via BP0/BP1 bits - isolates bootloader sectors from accidental overwrites during field updates. |
| Self-Timed Write Cycle | No external timing control needed; internal oscillator manages 5 ms programming - simplifies firmware design and eliminates timeout polling complexity. |
| Low Standby Current | 0.2 µA typical at 2.7V - extends battery life in portable instrumentation where EEPROM retains settings during sleep modes. |
| Industrial Temp Range | -40°C to +85°C operation - validated for deployment in automotive engine control modules and factory automation PLCs. |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing temperature-compensated gain/offset coefficients for analog front-end sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed during system boot and recalibration routines; SPI interface synchronized to MCU clock. Use Value: Enables field-adjustable calibration without firmware reflash; 100-year retention ensures accuracy across equipment lifetime. |
Use Scenario: Holding user-selectable therapy parameters (e.g., infusion rate limits, alarm thresholds) in portable insulin pumps. IC Role / Device Role / Timing Role: Secure configuration store with hardware write protection (WP pin tied low) preventing runtime corruption during power transitions. Use Value: Meets IEC 62304 safety requirements by guaranteeing immutable safety-critical settings across battery swaps and resets. |
| Automotive Body Control Module | Smart Energy Metering |
Use Scenario: Recording door lock actuation history and window position memory in vehicle BCMs for diagnostics and user convenience. IC Role / Device Role / Timing Role: High-reliability data logger interfaced to 3.3V CAN microcontroller; HOLD pin used to defer writes during CAN bus arbitration. Use Value: 1M endurance supports >10 years of daily 200-event logging; -40°C to +85°C rating matches under-hood thermal cycling. |
Use Scenario: Storing tariff schedules, meter ID, and tamper-detection flags in DIN-rail mounted electricity meters with 15+ year service life. IC Role / Device Role / Timing Role: Long-term configuration vault accessed infrequently but requiring guaranteed integrity; WP pin hardwired for permanent protection post-deployment. Use Value: 100-year data retention eliminates need for periodic data migration; block protection prevents unauthorized tariff modification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95640-DRMN6TP/K | 64 Kbit SPI EEPROM, 1.8–5.5 V supply, 20 MHz max clock, 5 ms write cycle, same 8-lead SOIC package (not PDIP). | Higher speed and wider voltage range; lacks HOLD pin - unsuitable for systems requiring interrupt-driven SPI suspension. | Select when board uses SOIC footprint and requires faster writes; verify absence of HOLD does not impact real-time firmware architecture. |
| 25AA640A-I/P | 64 Kbit SPI EEPROM, 1.8–5.5 V, 10 MHz max clock, 5 ms write cycle, pin-compatible 8-lead PDIP (same 8P3 footprint). | Microchip-branded successor with identical pinout and timing; supports additional SPI modes (1, 2) and enhanced ESD protection (4 kV HBM). | Drop-in replacement for new designs; preferred for supply chain continuity given AT25640 end-of-life status and broader vendor support. |
Compared with AT25640-10PI-2.7, M95640-DRMN6TP/K offers higher speed but removes HOLD functionality critical for deterministic interrupt handling, while 25AA640A-I/P provides identical PDIP compatibility plus extended SPI mode support and improved robustness - making it the optimal upgrade path for legacy footprint reuse.
Availability
AT25640-10PI-2.7 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply and long-term obsolescence management.
Supply support for AT25640-10PI-2.7 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
Atmel Corporation, now part of Microchip Technology, designs high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and consumer markets.
The AT25640-10PI-2.7 belongs to Atmel's SPI Serial EEPROM product line, engineered for low-power, low-voltage embedded systems needing robust, byte-addressable nonvolatile storage with hardware write protection.
FAQ
What is the maximum clock frequency supported by AT25640-10PI-2.7?
The AT25640-10PI-2.7 supports up to 3.0 MHz at VCC = 5.0V, 2.1 MHz at VCC = 2.7–5.5V, and 0.5 MHz at VCC = 1.8–5.5V. These values are specified in the AC Characteristics table and reflect guaranteed timing margins across temperature and voltage ranges - critical for ensuring reliable communication with host microcontrollers.
Does AT25640-10PI-2.7 support both SPI Mode 0 and Mode 3?
Yes, AT25640-10PI-2.7 explicitly supports SPI Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), as confirmed in the Features section. This dual-mode compatibility allows seamless integration with MCUs such as the ATmega328P (Mode 0 default) and certain STM32 variants configured for Mode 3.
How does the WRITE PROTECT (WP) pin function on AT25640-10PI-2.7?
On AT25640-10PI-2.7, the WP pin enables hardware write protection only when the WPEN bit in the status register is set to "1". When WP is low and WPEN=1, writes to the status register and block-protected memory regions are inhibited - a critical safeguard against accidental firmware corruption during power-up transients or software faults.
What is the purpose of the HOLD pin on AT25640-10PI-2.7?
The HOLD pin on AT25640-10PI-2.7 suspends ongoing SPI communication without resetting the internal address counter or command state. When asserted low while SCK is low, it pauses data transfer - allowing the host MCU to service higher-priority interrupts and resume exactly where it left off, preserving deterministic timing in real-time systems.
Is AT25640-10PI-2.7 suitable for automotive applications?
AT25640-10PI-2.7 is rated for industrial temperature range (-40°C to +85°C) and offered in automotive-grade variants per the datasheet, though the -10PI-2.7 suffix specifically denotes industrial qualification. For AEC-Q100 compliance, users must select designated automotive ordering codes (e.g., AT25640A-10PI-2.7) - AT25640-10PI-2.7 itself is not AEC-Q100 certified.
AT25640-10PI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 3 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25640-10PI-2.7 FAQ
1.How can I place an order for AT25640-10PI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640-10PI-2.7 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 AT25640-10PI-2.7 reliable?
The price and inventory of AT25640-10PI-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25640-10PI-2.7 is usually 5 days.
3.What payment methods are accepted for AT25640-10PI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640-10PI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640-10PI-2.7?
AT25640-10PI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640-10PI-2.7 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 AT25640-10PI-2.7?
For technical support, including AT25640-10PI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640-10PI-2.7 requirements.
6.How does Aetrix verify that AT25640-10PI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25640-10PI-2.7 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 AT25640-10PI-2.7 meets industry standards.
7.What is the process for return or replacement of AT25640-10PI-2.7?
All AT25640-10PI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25640-10PI-2.7, 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 AT25640-10PI-2.7 part is unused and in its original packaging.
Return procedure for AT25640-10PI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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