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Microchip Technology AT25640-10PI
- Part No.:
- AT25640-10PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25640-10PI.pdf
- Description:
- IC EEPROM 64KBIT SPI 3MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,403
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Product details
Overview
AT25640-10PI from Atmel is an industrial-grade 64 Kbit (8192 × 8) SPI serial EEPROM with 2.7–5.5 V operation, 3 MHz clock rate at 5 V, 32-byte page write capability, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in embedded controllers requiring reliable data retention over 100 years and 1 million write cycles.
For engineers reviewing the AT25640-10PI datasheet, AT25640-10PI pinout, AT25640-10PI application, or AT25640-10PI equivalent, key selection criteria include industrial temperature range (−40°C to +85°C), block write protection granularity (1/4, 1/2, or full array), self-timed 5 ms typical write cycle, and compatibility with SPI Modes 0 and 3 in low-power microcontroller systems.
Technical Context
The AT25640-10PI operates as a slave device on a 3-wire SPI bus (CS, SCK, SI/SO), supporting MSB-first transmission and op-code–driven command execution (WREN, WRITE, RDSR, WRSR). Its internal architecture includes an 8-bit instruction register and nonvolatile status register with BP0/BP1 bits controlling memory segment protection.
Write enable logic requires explicit WREN instruction before any WRITE or WRSR command; WRDI disables writes independently of WP pin state. HOLD pin suspends ongoing serial transfers without resetting sequence state, while WP pin-when enabled via WPEN bit-blocks status register writes when pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8 bytes), sufficient for firmware parameter tables or calibration data in resource-constrained systems |
| Supply Voltage Range | 2.7 V to 5.5 V - supports dual-voltage designs without level-shifting circuitry |
| Max Clock Frequency | 3.0 MHz at VCC = 5.0 V - enables fast configuration reads during system boot |
| Page Write Size | 32 bytes - balances programming speed and endurance by limiting per-cycle erase/write stress |
| Write Cycle Time | 5 ms typical - deterministic timing allows precise host software scheduling of nonblocking operations |
| Data Retention | 100 years - ensures long-term reliability in unattended industrial equipment |
| Endurance | 1 million write cycles - supports frequent logging or counter updates in telemetry applications |
Pinout & Package
AT25640-10PI is supplied in an 8-pin PDIP (8P3) package, 0.300" wide, with standard through-hole mounting and 0.100" lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for entire SPI transaction including op-code, address, and data phases |
| SCK | Serial Clock | Input-only synchronous clock; defines timing for SI sampling and SO output edges per SPI Mode 0/3 |
| SI | Serial Data Input | Host-to-device data path for op-codes, addresses, and write data; MSB-first, sampled on SCK rising edge (Mode 0) |
| SO | Serial Data Output | Device-to-host data path for read data and status register contents; high-impedance when CS is high or during HOLD |
| GND | Ground Reference | Signal and power return path; must be low-impedance to minimize noise coupling into sensitive SPI signals |
| VCC | Power Supply | Primary supply input; decoupling capacitor (0.1 µF) required within 10 mm of pin for stable 3 MHz operation |
| WP | Write Protect | Hardware lock for status register; functional only when WPEN bit = 1; prevents accidental configuration corruption |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without losing internal address/state; requires SCK low during assertion |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 and 3 Compatibility | Interoperates with legacy 68HC11 and modern ARM Cortex-M microcontrollers without protocol translation |
| Block Write Protection | Four protection levels (none, 1/4, 1/2, full array) configurable via nonvolatile BP0/BP1 bits for segmented security |
| Self-timed Write Cycle | No external delay or polling required beyond RDSR readiness check; simplifies firmware implementation |
| Industrial Temperature Range | Guaranteed operation from −40°C to +85°C - suitable for outdoor metering, factory automation, and transportation electronics |
| Low Standby Current | 2.0 µA max at 5 V - extends battery life in always-on sensor nodes or backup power configurations |
Applications
| Smart Energy Metering | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Storing tariff schedules, meter calibration constants, and tamper-event logs in electricity/water/gas meters deployed outdoors. IC Role / Device Role / Timing Role: Nonvolatile configuration and event storage EEPROM interfaced directly to an 8-bit or 32-bit MCU via SPI. Use Value: 100-year data retention ensures lifetime accuracy without field recalibration; 1M endurance supports daily log writes for >2700 years. | Use Scenario: Holding I/O mapping tables, module identification data, and firmware update staging buffers in modular programmable logic controllers. IC Role / Device Role / Timing Role: Dedicated SPI EEPROM for persistent parameter storage, isolated from main program flash to prevent corruption during updates. Use Value: Block write protection prevents accidental overwrite of critical I/O configuration during hot-swap events or firmware reflash sequences. |
| Medical Diagnostic Equipment | Automotive Body Control Units |
Use Scenario: Saving user preferences, calibration offsets, and diagnostic fault history in portable ultrasound or ECG devices with battery backup. IC Role / Device Role / Timing Role: Low-power SPI EEPROM operating from 2.7 V supply, accessed during power-up and shutdown sequences. Use Value: 2.0 µA standby current minimizes battery drain during idle periods; industrial temp rating covers clinical environment variations. | Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in automotive body control modules subject to thermal cycling. IC Role / Device Role / Timing Role: Robust configuration storage IC mounted on same PCB as MCU, communicating over short SPI traces. Use Value: −40°C to +85°C operation ensures reliability across engine bay and cabin zones; WP pin hardens against EMI-induced write errors. |
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, 2.5–5.5 V supply, but 20 MHz max clock and 5 ms write time; uses different status register layout and lacks HOLD pin | Higher-speed read capability suits burst-access scenarios; absence of HOLD limits use in multi-master or interrupt-driven SPI contexts | Select M95640-DW when maximum read throughput is prioritized and HOLD functionality is unnecessary |
| 25AA640A-I/P | 64 Kbit, 1.8–5.5 V, 10 MHz max clock, 5 ms write time; includes extended address mode and enhanced ESD protection (4 kV HBM) | Broad voltage range supports single-supply 1.8 V systems; higher ESD rating improves robustness in handling-sensitive automotive assembly lines | Choose 25AA640A-I/P for 1.8 V operation or where enhanced ESD immunity is mandated by manufacturing process requirements |
Compared with M95640-DW and 25AA640A-I/P, the AT25640-10PI offers guaranteed HOLD functionality and industrial temperature support out-of-box, while trading off maximum clock speed for proven interoperability with legacy 68HC11-based designs and simpler status register management.
Availability
AT25640-10PI is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, and automotive body control units requiring stable component supply across extended product lifecycles.
Supply support for AT25640-10PI 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 AT25xxx family was designed specifically for SPI-based embedded systems needing compact, low-power, high-reliability serial EEPROM with flexible voltage operation and robust data protection features.
FAQ
What is the operating temperature range for the AT25640-10PI?
The AT25640-10PI is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the AT25640 Ordering Information table (page 17), where "AT25640-10PI" is explicitly listed under the Industrial (-40°C to 85°C) operation range. The device meets this range across all electrical parameters including supply current, timing, and write endurance.
Does the AT25640-10PI support 1.8 V operation?
No, the AT25640-10PI does not support 1.8 V operation. Its specified supply range is 2.7 V to 5.5 V, as indicated by the "-10PI" suffix and confirmed in the AT25640 Ordering Information table. For 1.8 V operation, the correct variant is AT25640-10PI-1.8, which has separate ordering codes and distinct DC/AC characteristics.
How many write cycles can the AT25640-10PI endure?
The AT25640-10PI guarantees 1 million write cycles at 5.0 V and 25°C, as stated in the Endurance specification on page 5 of the datasheet. This endurance applies to page-write and byte-write operations alike and is validated across the full industrial temperature range per qualification testing.
What packages are available for the AT25640-10PI?
The AT25640-10PI is offered in four package types: 8-pin PDIP (8P3), 8-lead JEDEC SOIC (8S1), 14-lead TSSOP (14T), and 20-lead TSSOP (20T), as documented in the AT25640 Ordering Information table (page 17). All variants share identical electrical specifications and industrial temperature rating.
Is the HOLD pin functional on the AT25640-10PI?
Yes, the HOLD pin is fully functional on the AT25640-10PI. As described in the Functional Description (page 6) and HOLD Timing diagram (page 13), it suspends serial communication without resetting the internal address counter or command state, provided it is asserted while SCK is low. This behavior is consistent across all package variants of the AT25640-10PI.
AT25640-10PI 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25640-10PI FAQ
1.How can I place an order for AT25640-10PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640-10PI 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 reliable?
The price and inventory of AT25640-10PI 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 is usually 5 days.
3.What payment methods are accepted for AT25640-10PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640-10PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640-10PI?
AT25640-10PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640-10PI 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?
For technical support, including AT25640-10PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640-10PI requirements.
6.How does Aetrix verify that AT25640-10PI is sourced from the original manufacturer or authorized distributors?
All AT25640-10PI 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 meets industry standards.
7.What is the process for return or replacement of AT25640-10PI?
All AT25640-10PI units undergo pre-shipment inspection (PSI). If there is an issue with AT25640-10PI, 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 part is unused and in its original packaging.
Return procedure for AT25640-10PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25640-10PI Tags
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