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Microchip Technology AT25640A-10PU-2.7
- Part No.:
- AT25640A-10PU-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25640A-10PU-2.7.pdf
- Description:
- IC EEPROM 64KBIT SPI 20MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,335
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Product details
Overview
AT25640A-10PU-2.7 from Microchip Technology (formerly Atmel) is a 64-Kbit SPI serial EEPROM organized as 8192 × 8-bit memory, operating at 2.7–5.5 V with 20 MHz max clock rate at 5 V, 32-byte page write capability, and hardware/software write protection. It serves as nonvolatile configuration storage in industrial control modules requiring low-voltage operation and high endurance.
For engineers reviewing the AT25640A-10PU-2.7 datasheet, AT25640A-10PU-2.7 pinout, AT25640A-10PU-2.7 application, or AT25640A-10PU-2.7 equivalent, key selection considerations include its 2.7–5.5 V supply range, 8-lead PDIP package, SPI Mode 0/3 compatibility, 1 million write cycles, and block write protection covering 1/4, 1/2, or full array.
Technical Context
The AT25640A-10PU-2.7 implements a synchronous serial peripheral interface (SPI) slave architecture with separate SI/SO lines, CS-controlled selection, and HOLD pin for communication suspension without sequence reset. It supports both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), though datasheet timing diagrams and functional description are explicitly validated for Mode 0.
Its internal architecture includes an 8-bit instruction register, nonvolatile status register with WPEN, BP0, BP1, WEN, and RDY bits, and automatic address increment during page writes. Write enable (WREN) is mandatory before programming, and 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 array), enabling storage of firmware patches or calibration data in space-constrained embedded systems |
| Supply Voltage Range | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level shifting |
| Max Clock Frequency | 20 MHz at VCC = 5 V - enables fast configuration reads during system boot-up sequences |
| Page Write Size | 32 bytes - reduces write latency versus byte-write-only devices and aligns with typical MCU cache line sizes |
| Endurance | 1 million write cycles - suitable for logging applications with frequent parameter updates |
| Data Retention | 100 years at 25 °C - ensures long-term reliability in unattended infrastructure equipment |
| Write Cycle Time | ≤5 ms - allows deterministic timing budgeting for real-time control loops during write operations |
Pinout & Package
AT25640A-10PU-2.7 is packaged in an 8-lead JEDEC PDIP (0.300" wide body), pin-compatible with industry-standard through-hole socket footprints and compatible with wave soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; device ignores SI and drives SO high-Z when CS is high |
| SCK | Serial Clock | Input-only clock; defines timing for SI sampling and SO output transitions per SPI mode |
| SI | Serial Data Input | Master-to-slave command/address/data input; MSB-first transmission required |
| SO | Serial Data Output | Slave-to-master data output; tri-stated when CS is high or HOLD is asserted |
| GND | Ground Reference | Return path for VCC and all I/O signals; must be low-impedance for noise immunity |
| VCC | Power Supply | 2.7–5.5 V supply; powers internal logic and EEPROM array; decoupling capacitor required |
| 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 internal address counter or command state |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperability with diverse host controllers including legacy 68HC11 and modern ARM Cortex-M SPI peripherals |
| Block Write Protection | Configurable 1/4, 1/2, or full-array lock via nonvolatile BP0/BP1 bits - prevents accidental overwrites of critical firmware sections |
| Hardware + Software Write Protection | WP pin and WRSR/WREN instructions provide layered security - essential for field-upgradable industrial devices |
| Self-Timed Write Cycle | No external timing control needed; internal circuitry manages erase/write/verify - simplifies host firmware design |
| Industrial Temp Range | –40 °C to +85 °C operation - qualified for deployment in factory automation, power meters, and motor drives |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables and PID tuning parameters in programmable logic controllers subject to frequent reconfiguration. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during cold start and runtime parameter updates via SPI. Use Value: 1 million write cycles and 100-year retention ensure integrity across decades of maintenance cycles without battery backup. | Use Scenario: Holding sensor offset/gain coefficients and regulatory compliance logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant data vault using WP pin and status register lock to prevent unauthorized calibration changes. Use Value: Block protection isolates calibration sectors from application code updates, meeting IEC 62304 software safety requirements. |
| Automotive Body Control Module | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Saving seat/mirror position presets and lighting profiles in 12 V automotive systems with transient-suppressed 5 V rails. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced directly to 5 V microcontroller SPI bus; operates reliably during cranking dips down to 2.7 V. Use Value: 2.7–5.5 V operation eliminates need for dedicated LDO, reducing BOM cost and PCB area in space-limited BCMs. | Use Scenario: Storing encrypted firmware delta patches downloaded over PLC or RF links for remote meter upgrades. IC Role / Device Role / Timing Role: High-reliability storage node supporting atomic 32-byte page writes to minimize risk of corruption during power loss. Use Value: ≤5 ms write time enables safe patch commit within supercapacitor hold-up window, ensuring upgrade integrity. |
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 8-lead SOIC package, but rated for 5.5 V max only (no 2.7 V min spec); 10 MHz max clock at 2.5 V | Less suitable for 2.7 V battery-backed systems; requires higher minimum VCC for full-speed operation | Select if operating exclusively at 5 V and prioritizing STMicroelectronics supply chain alignment |
| BR24G64FJ-WE2 | I²C interface (not SPI); 1.7–5.5 V supply; 400 kHz standard-mode / 1 MHz fast-mode clock; 32-byte page write | Requires I²C-capable host; incompatible pinout and protocol stack; no HOLD or WP pin functionality | Choose only when system already uses I²C for other peripherals and board layout cannot accommodate SPI routing |
Compared with M95640-DW and BR24G64FJ-WE2, AT25640A-10PU-2.7 uniquely delivers guaranteed 20 MHz SPI performance at 5 V, explicit 2.7 V minimum operation, and dual hardware/software write protection - making it optimal for high-speed, low-voltage industrial designs where protocol flexibility and data security are critical.
Availability
AT25640A-10PU-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT25640A-10PU-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 robust, long-lifecycle components for industrial and automotive markets.
AT25640A-10PU-2.7 belongs to Microchip's legacy Atmel serial EEPROM product line, engineered for reliable nonvolatile data storage in resource-constrained embedded systems where low-voltage operation, high endurance, and SPI simplicity are primary requirements.
FAQ
What is the maximum clock frequency supported by AT25640A-10PU-2.7?
The AT25640A-10PU-2.7 supports up to 20 MHz SCK frequency when VCC = 5.0 V. At lower voltages (2.7–3.6 V), the maximum clock rate is reduced to 10 MHz, and at 1.8–2.6 V, it is limited to 5 MHz - values confirmed in Table 1-3 of the official datasheet. This graded speed scaling ensures timing margin across its full operating voltage range.
Does AT25640A-10PU-2.7 support SPI Mode 0 exclusively, or are other modes usable?
The AT25640A-10PU-2.7 supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as explicitly stated in its Features section. However, all timing diagrams, AC characteristics, and functional descriptions in the datasheet are specified and validated for Mode 0 operation. Mode 3 use requires independent validation by the designer.
How does the write protection mechanism work on AT25640A-10PU-2.7?
The AT25640A-10PU-2.7 implements dual-layer write protection: hardware via the WP pin (when WPEN=1 and WP=low) and software via status register bits BP0/BP1. These bits configure protection for 0%, 25%, 50%, or 100% of the memory array. The WP pin locks the status register itself, preventing modification of protection settings during field operation.
What package type is used for AT25640A-10PU-2.7?
AT25640A-10PU-2.7 uses an 8-lead JEDEC PDIP (Plastic Dual Inline Package) with 0.300" body width, designated as package code "8P3". This through-hole package is RoHS-compliant ("U" suffix), lead-free, and suitable for prototyping, manual assembly, and wave soldering in industrial PCBs.
Is AT25640A-10PU-2.7 suitable for automotive applications?
AT25640A-10PU-2.7 is qualified for industrial temperature range (–40 °C to +85 °C) and listed as "Available in Automotive" in the Features section. However, it is not AEC-Q100 qualified. For automotive body electronics where AEC-Q100 is not mandated, it provides proven reliability; for powertrain or safety-critical systems, AEC-Q100-qualified alternatives should be selected.
AT25640A-10PU-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-10PU-2.7 FAQ
1.How can I place an order for AT25640A-10PU-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640A-10PU-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-10PU-2.7 reliable?
The price and inventory of AT25640A-10PU-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-10PU-2.7 is usually 5 days.
3.What payment methods are accepted for AT25640A-10PU-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640A-10PU-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640A-10PU-2.7?
AT25640A-10PU-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640A-10PU-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-10PU-2.7?
For technical support, including AT25640A-10PU-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640A-10PU-2.7 requirements.
6.How does Aetrix verify that AT25640A-10PU-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25640A-10PU-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-10PU-2.7 meets industry standards.
7.What is the process for return or replacement of AT25640A-10PU-2.7?
All AT25640A-10PU-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25640A-10PU-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-10PU-2.7 part is unused and in its original packaging.
Return procedure for AT25640A-10PU-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25640A-10PU-2.7 Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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