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Microchip Technology AT25640A-10PI-2.7
- Part No.:
- AT25640A-10PI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25640A-10PI-2.7.pdf
- Description:
- IC EEPROM 64KBIT SPI 20MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,394
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Product details
Overview
AT25640A-10PI-2.7 from Microchip Technology (formerly Atmel) is a 64 Kbit SPI serial EEPROM organized as 8192 × 8-bit memory, operating from 2.7V to 5.5V, supporting 20 MHz clock rate at 5V, featuring 32-byte page write and hardware/software write protection. It serves as nonvolatile configuration storage in industrial control modules requiring robust data retention.
For engineers reviewing the AT25640A-10PI-2.7 datasheet, AT25640A-10PI-2.7 pinout, AT25640A-10PI-2.7 application, or AT25640A-10PI-2.7 equivalent, key selection criteria include VCC range (2.7–5.5 V), 8-lead PDIP package compatibility, 100-year data retention, 1 million write cycles, and SPI Mode 0/3 support for microcontroller interfacing.
Technical Context
The AT25640A-10PI-2.7 implements a synchronous SPI slave interface with dedicated SI/SO pins, CS-controlled selection, and HOLD pin for serial communication suspension without reset. It uses an 8-bit instruction register with MSB-first transmission and supports WREN/WRDI/RDSR/WRSR/READ/WRITE op-codes.
Block write protection is configurable via status register bits BP1/BP0 to protect 0%, 25%, 50%, or 100% of the 8192-word array. The WP pin enables hardware-level protection when WPEN = 1, while internal self-timed write cycles complete in ≤5 ms with no external erase required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8-bit), enabling storage of firmware parameters or calibration data in space-constrained designs |
| Supply Voltage | 2.7 V to 5.5 V - supports direct integration into 3.3 V and 5 V systems without level-shifting |
| Max Clock Rate | 20 MHz at VCC = 5 V - enables fast configuration reads during system boot or runtime updates |
| Write Endurance | 1 million cycles - suitable for applications with frequent parameter logging or field-updatable settings |
| Data Retention | 100 years at +25°C - ensures long-term reliability in unattended industrial deployments |
| Page Write Size | 32 bytes - optimizes write efficiency by minimizing transaction overhead per programming operation |
| Operating Temp | −40°C to +85°C - qualified for industrial temperature range operation without derating |
Pinout & Package
AT25640A-10PI-2.7 is supplied in an 8-lead PDIP (Plastic Dual Inline Package), 0.300" wide body, with through-hole mounting and JEDEC-standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; device responds only when CS is low, enabling multi-device SPI bus sharing |
| SCK | Serial Clock | Input clock synchronized to master; defines timing for SI sampling and SO output edges per SPI Mode 0/3 |
| SI | Serial Data Input | Receives op-codes, addresses, and write data; MSB-first, sampled on SCK rising edge (Mode 0) |
| SO | Serial Data Output | Drives read data and status bits; high-impedance when CS high or during HOLD assertion |
| GND | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance PCB connection to minimize noise coupling |
| VCC | Power Supply | Single supply input (2.7–5.5 V); powers internal logic and memory array; bypass capacitor recommended |
| WP | Write Protect | Hardware lock for status register and protected memory blocks when WPEN = 1 and WP = low |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting address counter; requires SCK low before assertion |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperates with 6805/68HC11 and modern MCUs without protocol translation or glue logic |
| 32-byte Page Write | Reduces total write time vs. byte-write by up to 32×, critical for rapid parameter updates in real-time systems |
| Four-Tier Block Protection | Enables selective lockdown of configuration sectors (e.g., protect calibration data while allowing log writes) |
| Self-timed Write Cycle | Eliminates need for external timing control or polling delay circuits; max 5 ms duration guarantees predictable latency |
| Automotive-Grade Options | Extended temp (−40°C to +125°C) and lead-free/halogen-free variants available for harsh-environment use |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Memory |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration EEPROM interfaced via SPI to ARM Cortex-M4 host MCU during power-up initialization. Use Value: Ensures deterministic boot behavior and eliminates need for external configuration EEPROM programming fixtures. | Use Scenario: Retaining sensor calibration coefficients and usage history in portable diagnostic equipment subject to periodic firmware updates. IC Role / Device Role / Timing Role: SPI-connected data logger memory with block protection isolating calibration data from user-modifiable fields. Use Value: Prevents accidental overwrites of certified calibration values while permitting field service updates to operational logs. |
| Automotive Body Control Module | Smart Energy Meter Firmware Parameters |
Use Scenario: Holding seat position presets, mirror angles, and lighting profiles in automotive BCMs across vehicle lifecycle. IC Role / Device Role / Timing Role: Low-voltage (2.7–5.5 V) SPI EEPROM accessed by 8-bit microcontroller during ignition-on sequence. Use Value: Guarantees 100-year data retention and 1M write endurance under repeated daily reconfiguration. | Use Scenario: Storing tariff schedules, metering constants, and tamper-event timestamps in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Secure configuration store with hardware WP pin tied to system security controller for write-lock enforcement. Use Value: Meets ANSI/IEEE requirements for nonvolatile parameter integrity and audit-trail persistence over 20+ year deployments. |
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 rated for −40°C to +125°C and offers faster 20 MHz operation across full voltage range | Preferred for extended-temperature automotive or industrial environments where AT25640A-10PI-2.7's 85°C limit is insufficient | Select M95640-DW when ambient operating temperature exceeds +85°C or tighter VCC min (2.5 V) is required |
| 25AA640A-I/P | Identical pinout and function, but manufactured by Microchip as second-source part with same 2.7–5.5 V range and PDIP packaging | No functional or layout change needed; used interchangeably in legacy designs where dual-sourcing improves supply chain resilience | Choose 25AA640A-I/P for BOM diversification without redesign, especially for long-lifecycle industrial programs |
Compared with M95640-DW and 25AA640A-I/P, AT25640A-10PI-2.7 provides verified industrial-temperature operation and legacy design continuity, while offering identical 8-lead PDIP footprint and SPI command set-making it optimal for cost-sensitive, volume-manufactured control systems with stable thermal profiles.
Availability
AT25640A-10PI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, and smart energy meters requiring stable component supply and long-term obsolescence management.
Supply support for AT25640A-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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.
The AT25640A-10PI-2.7 belongs to Microchip's legacy SPI serial EEPROM product line, designed specifically for reliable, low-power nonvolatile storage in resource-constrained microcontroller-based systems.
FAQ
What is the maximum clock frequency supported by AT25640A-10PI-2.7?
The AT25640A-10PI-2.7 supports up to 20 MHz SCK frequency when VCC = 5.0 V. At lower supply voltages (2.7–3.6 V), the maximum clock rate is reduced to 10 MHz per AC characteristics tables. This ensures timing compliance across its full 2.7–5.5 V operating range without requiring dynamic clock scaling in host firmware.
Does AT25640A-10PI-2.7 require an external erase cycle before writing?
No, AT25640A-10PI-2.7 does not require a separate erase cycle. All write operations are self-timed and automatically erase and program the target memory location within the 5 ms maximum write cycle time. This simplifies firmware implementation and eliminates erase-related timing uncertainty in real-time applications.
How is write protection implemented on AT25640A-10PI-2.7?
AT25640A-10PI-2.7 implements dual-layer write protection: software-based via status register bits BP1/BP0 (configurable 0%/25%/50%/100% array lock) and hardware-based via the WP pin when WPEN = 1. Both mechanisms inhibit writes to protected memory regions and the status register itself, providing defense-in-depth against accidental or malicious modification.
What package type is used for AT25640A-10PI-2.7?
AT25640A-10PI-2.7 uses an 8-lead PDIP (Plastic Dual Inline Package) with 0.300" body width, designated as package code 8P3. It features through-hole mounting, JEDEC-standard pin spacing (0.100" pitch), and is compatible with standard wave-soldering and manual assembly processes.
Is AT25640A-10PI-2.7 compatible with SPI Mode 0 and Mode 3 only?
Yes, AT25640A-10PI-2.7 is explicitly specified to support only SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1). Its timing diagrams and electrical specifications are validated for these two modes only; using Mode 1 or Mode 2 may result in unreliable data capture or corruption due to mismatched sampling/edge alignment.
AT25640A-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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25640A-10PI-2.7 FAQ
1.How can I place an order for AT25640A-10PI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640A-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 AT25640A-10PI-2.7 reliable?
The price and inventory of AT25640A-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 AT25640A-10PI-2.7 is usually 5 days.
3.What payment methods are accepted for AT25640A-10PI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640A-10PI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640A-10PI-2.7?
AT25640A-10PI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640A-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 AT25640A-10PI-2.7?
For technical support, including AT25640A-10PI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640A-10PI-2.7 requirements.
6.How does Aetrix verify that AT25640A-10PI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25640A-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 AT25640A-10PI-2.7 meets industry standards.
7.What is the process for return or replacement of AT25640A-10PI-2.7?
All AT25640A-10PI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25640A-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 AT25640A-10PI-2.7 part is unused and in its original packaging.
Return procedure for AT25640A-10PI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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