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Microchip Technology AT25640N-10SI
- Part No.:
- AT25640N-10SI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25640N-10SI.pdf
- Description:
- IC EEPROM 64KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,132
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Product details
Overview
AT25640N-10SI from Atmel is a 64 Kbit (8192 × 8) serial SPI EEPROM optimized for industrial temperature operation (–40°C to +85°C), supporting 2.7V–5.5V supply, 32-byte page writes, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in microcontroller-based embedded systems requiring reliable data retention over 100 years.
For engineers reviewing the AT25640N-10SI datasheet, AT25640N-10SI pinout, AT25640N-10SI application, or AT25640N-10SI equivalent, key selection criteria include industrial-grade temperature range, 5 ms typical write cycle time, SPI Mode 0/3 compatibility, block write protection granularity (1/4, 1/2, or full array), and JEDEC SOIC-8 package footprint.
Technical Context
The AT25640N-10SI operates as a slave device on a 3-wire SPI bus (CS, SCK, SI/SO), with separate input (SI) and output (SO) pins and MSB-first data framing. Its instruction set includes WREN, WRDI, RDSR, WRSR, READ, and WRITE - all initiated by CS low and validated by op-code reception.
Internal architecture features a nonvolatile status register with BP0/BP1 bits controlling block protection levels and WPEN enabling hardware write protection. The HOLD pin suspends ongoing serial transfers without resetting sequence state, while self-timed internal write cycles eliminate external timing management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 words × 8 bits); sufficient for firmware parameter tables, calibration data, or device configuration in space-constrained designs. |
| Supply Voltage Range | 2.7V to 5.5V; enables direct interface with 3.3V and 5V microcontrollers without level-shifting. |
| Max Clock Frequency | 3.0 MHz at 5V; supports high-throughput read/write operations in real-time control applications. |
| Write Cycle Time | 5 ms typical; defines minimum interval between successive write commands and impacts system responsiveness during configuration updates. |
| Endurance & Retention | 1 million write cycles / 100-year data retention; ensures long-term reliability in field-deployed industrial equipment. |
| Operating Temperature | –40°C to +85°C; qualified for use in automotive under-hood modules, factory automation controllers, and outdoor IoT gateways. |
| Package | 8-lead JEDEC SOIC (8S1); standard surface-mount footprint compatible with automated PCB assembly and reflow processes. |
Pinout & Package
AT25640N-10SI is housed in an 8-lead JEDEC SOIC (8S1) package measuring 4.90 mm × 3.90 mm × 1.75 mm, with gull-wing leads and standard 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low during entire SPI transaction to activate device communication. |
| SCK | Serial Clock | Input-only clock signal; synchronizes SI data sampling and SO data output per SPI Mode 0/3 timing requirements. |
| SI | Serial Data Input | Accepts op-codes, addresses, and write data; ignored when CS is high or during HOLD assertion. |
| SO | Serial Data Output | Drives read data and status register contents; enters high-impedance state when CS is high or HOLD is active. |
| WP | Write Protect | Hardware lock for status register writes when WPEN=1; prevents accidental corruption of protection settings during power transitions. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting internal address counter; allows master to service higher-priority interrupts. |
| VCC | Power Supply | Primary supply rail (2.7–5.5 V); powers logic and memory array; requires local 0.1 µF decoupling capacitor. |
| GND | Ground | Reference node for all I/O and internal circuitry; must be connected to system ground plane with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Compatible with legacy 68HC11 and modern ARM Cortex-M MCUs without protocol translation logic. |
| 32-byte Page Write | Reduces total programming time versus byte-write mode; enables efficient bulk configuration updates in sensor nodes. |
| Four-Tier Block Protection | Configurable via status register to lock 0%, 25%, 50%, or 100% of memory - critical for safeguarding bootloader or security keys. |
| Hardware + Software Write Protection | WP pin and WRSR instruction provide redundant safeguards against unintended writes during firmware upgrades or brown-out conditions. |
| Industrial Temperature Range | Validated operation from –40°C to +85°C ensures stable performance in uncontrolled environments like motor drives or HVAC controls. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory-floor cabinets. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed infrequently during commissioning or maintenance, with write protection preventing runtime corruption. Use Value: Ensures deterministic startup behavior after power loss and eliminates need for external backup batteries or supercapacitors. |
Use Scenario: Retaining sensor offset/gain coefficients and regulatory compliance logs in portable diagnostic equipment subject to sterilization cycles. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for FDA-mandated calibration records; accessed only during device initialization or service mode. Use Value: Meets IEC 62304 data integrity requirements with 1M endurance and 100-year retention, reducing recalibration frequency. |
| Automotive Body Control Module | Smart Energy Meter Firmware Parameters |
|
Use Scenario: Holding seat position presets, mirror angles, and lighting profiles in vehicle body control units operating across extended ambient temperatures. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfacing directly with CAN-connected microcontrollers; protected via WP pin during ECU reset sequences. Use Value: Survives automotive thermal cycling (-40°C to +85°C) and meets AEC-Q100 stress test requirements without derating. |
Use Scenario: Storing tariff schedules, metering constants, and cryptographic keys in utility-grade electricity meters exposed to outdoor temperature extremes. IC Role / Device Role / Timing Role: Trusted configuration store with hardware write lock; accessed via isolated SPI interface to prevent grid-induced noise corruption. Use Value: Enables secure remote firmware updates while maintaining regulatory audit trails through immutable block-protected memory segments. |
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 | Same 64 Kbit density and SOIC-8 package; operates at 1.8–5.5 V; max clock 20 MHz; write cycle 5 ms typical. | Broader voltage range supports 1.8V logic; higher clock rate benefits high-speed data loggers; identical industrial temp grade. | Select M95640-DRMN6TP/K when migrating to lower-voltage MCU platforms or requiring faster sequential reads. |
| BR24G64FJ-WE2 | I²C interface (not SPI); 64 Kbit; SOIC-8; 1.7–5.5 V; write cycle 5 ms; industrial temp (–40°C to +85°C). | Requires I²C host controller instead of SPI; lacks HOLD pin and block protection granularity (only full-array lock). | Choose BR24G64FJ-WE2 only if existing design uses I²C infrastructure and does not require partial memory locking or suspend capability. |
Compared with M95640-DRMN6TP/K and BR24G64FJ-WE2, the AT25640N-10SI provides SPI-native timing control, finer-grained block protection (1/4 or 1/2 array), and HOLD functionality - making it optimal for real-time embedded systems where deterministic interrupt handling and selective memory lockdown are required.
Availability
AT25640N-10SI is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive body electronics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT25640N-10SI 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) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT25640N-10SI belongs to Atmel's SPI Serial EEPROM family, designed specifically for robust, low-power, industrial-grade data storage in resource-constrained embedded systems interfacing with 8-bit and 32-bit microcontrollers.
FAQ
What is the maximum SPI clock frequency supported by the AT25640N-10SI?
The AT25640N-10SI supports up to 3.0 MHz at VCC = 5.0 V, 2.1 MHz at VCC = 2.7–5.5 V, and 0.5 MHz at VCC = 1.8–3.6 V. For the AT25640N-10SI specifically - rated for 2.7–5.5 V operation - the guaranteed maximum clock rate is 2.1 MHz across its full industrial temperature range (–40°C to +85°C), as specified in AC Characteristics Table on page 4 of Rev. 0675F.
Does the AT25640N-10SI support partial memory block protection?
Yes, the AT25640N-10SI supports four levels of block write protection via BP0/BP1 bits in its status register: no protection, top 1/4 (1800–1FFFh), top 1/2 (1000–1FFFh), or full array (0000–1FFFh). This allows selective locking of critical configuration sectors while leaving others writable - a feature confirmed in Table 4 and functional description on pages 9–10 of the AT25640 datasheet.
What package type is used for the AT25640N-10SI?
The AT25640N-10SI uses an 8-lead JEDEC SOIC package (designated 8S1), with 1.27 mm lead pitch, 4.90 mm × 3.90 mm body dimensions, and gull-wing leads. This is explicitly stated in the AT25640 Ordering Information table (page 17) and Packaging Information diagrams (page 18) of the datasheet.
Can the AT25640N-10SI operate with a 3.3V microcontroller without level shifters?
Yes, the AT25640N-10SI is fully compatible with 3.3V systems: its VCC range is 2.7V to 5.5V, VIH min is VCC × 0.7 (≥2.31V at 3.3V), and VOL max is 0.2V at IOL = 0.15 mA - all meeting standard 3.3V CMOS logic thresholds. No level shifting is needed when interfacing with 3.3V SPI masters, as verified in DC Characteristics Table (page 3).
How does the HOLD pin function during an active SPI transaction on the AT25640N-10SI?
The HOLD pin on the AT25640N-10SI suspends serial communication without resetting the internal address counter or command state. When asserted low while SCK is low, it places SO in high-impedance and ignores SI inputs until HOLD is deasserted - allowing the host MCU to service interrupts or perform other tasks. This behavior is defined in the HOLD section (page 6) and timing diagram (page 13) of the AT25640 datasheet.
AT25640N-10SI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25640N-10SI FAQ
1.How can I place an order for AT25640N-10SI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640N-10SI 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 AT25640N-10SI reliable?
The price and inventory of AT25640N-10SI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25640N-10SI is usually 5 days.
3.What payment methods are accepted for AT25640N-10SI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640N-10SI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640N-10SI?
AT25640N-10SI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640N-10SI 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 AT25640N-10SI?
For technical support, including AT25640N-10SI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640N-10SI requirements.
6.How does Aetrix verify that AT25640N-10SI is sourced from the original manufacturer or authorized distributors?
All AT25640N-10SI 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 AT25640N-10SI meets industry standards.
7.What is the process for return or replacement of AT25640N-10SI?
All AT25640N-10SI units undergo pre-shipment inspection (PSI). If there is an issue with AT25640N-10SI, 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 AT25640N-10SI part is unused and in its original packaging.
Return procedure for AT25640N-10SI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25640N-10SI Tags
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