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Microchip Technology AT25640-10PI-1.8
- Part No.:
- AT25640-10PI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25640-10PI-1.8.pdf
- Description:
- IC EEPROM 64KBIT SPI 3MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,405
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Product details
Overview
AT25640-10PI-1.8 from Microchip Technology (formerly Atmel) is a 64 Kbit SPI serial EEPROM organized as 8192 × 8-bit memory, supporting 1.8 V to 5.5 V operation with 32-byte page write capability, 3.0 MHz clock rate at 5 V, and hardware/software write protection via WP pin and status register. It serves in industrial control systems for nonvolatile parameter storage under low-voltage conditions.
For engineers reviewing the AT25640-10PI-1.8 datasheet, AT25640-10PI-1.8 pinout, AT25640-10PI-1.8 application, or AT25640-10PI-1.8 equivalent, key selection considerations include 1.8 V minimum supply compatibility, block write protection granularity (1/4, 1/2, or full array), self-timed 5 ms typical write cycle, and 8-lead PDIP package with CS/SCK/SI/SO/WP/HOLD interface signals.
Technical Context
The AT25640-10PI-1.8 implements a synchronous SPI slave interface compliant with Modes 0 and 3, requiring CS assertion before SI/SO data transfer and using MSB-first framing. Its internal architecture includes an 8-bit instruction register handling WREN, WRITE, READ, RDSR, WRSR, and WRDI commands.
Block write protection is controlled by two nonvolatile BP0/BP1 bits in the status register, enabling selective locking of memory segments-0x0000–0x1FFF (full), 0x1000–0x1FFF (1/2), or 0x1800–0x1FFF (1/4) for the AT25640 variant-while WPEN bit enables or disables hardware write protection via the WP pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8-bit words), sufficient for firmware configuration tables or calibration data in space-constrained designs |
| Supply Voltage Range | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V logic families and legacy 5 V microcontrollers without level shifting |
| Max Clock Frequency | 3.0 MHz at VCC = 5.0 V - enables fast bulk reads/writes while maintaining timing margins across temperature |
| Page Write Capacity | 32 bytes per write cycle - reduces transaction overhead versus byte-write EEPROMs and improves programming efficiency |
| Write Endurance | 1 million cycles - ensures long-term reliability in applications requiring frequent parameter updates (e.g., energy metering logs) |
| Data Retention | 100 years at +25°C - guarantees persistent storage integrity over product lifetime without refresh mechanisms |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including factory automation and outdoor telemetry nodes |
Pinout & Package
AT25640-10PI-1.8 uses an 8-lead PDIP (8P3) package: 0.300" wide body, 0.100" lead pitch, through-hole mounting compatible with standard wave-solder processes and prototyping breadboards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low during entire SPI transaction to assert device on shared bus |
| SCK | Serial Clock | Master-generated clock input; timing-critical for setup/hold compliance (min tWH/tWL = 800 ns at 1.8 V) |
| SI | Serial Data Input | Receives op-codes, addresses, and write data; sampled on SCK rising edge in Mode 0 |
| SO | Serial Data Output | Drives read data and status bits; high-impedance when CS high or HOLD active |
| WP | Write Protect | Hardware lock for status register and protected memory blocks when WPEN = 1 and WP = low |
| HOLD | Communication Suspend | Pauses ongoing SPI sequence without resetting address counter; requires SCK low during assertion |
| GND | Ground Reference | Signal and power return path; decoupling capacitor required within 10 mm of VCC pin |
| VCC | Power Supply | Single-supply input supporting 1.8–5.5 V; ISB1 standby current ≤1.0 µA at 1.8 V enables ultra-low-power sleep modes |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode Compatibility | Supports both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), ensuring interoperability with diverse MCU SPI peripherals |
| Flexible Write Protection | Four protection levels (none, 1/4, 1/2, full array) configured via nonvolatile BP0/BP1 bits, enabling granular security for boot code vs. user settings |
| Hybrid Data Protection | Combines hardware (WP pin) and software (WREN/WRDI/RDSR) controls to prevent accidental writes during power transitions or firmware faults |
| Self-Timed Programming | No external erase step required; internal 5 ms typical write cycle eliminates need for timeout polling in host firmware |
| Low-Voltage Operation | Guaranteed functionality down to 1.8 V with full AC/DC specs maintained, simplifying power architecture in battery-powered IoT sensors |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via SPI during boot and runtime reconfiguration; holds critical state between power cycles. Use Value: 1.8 V operation allows direct connection to low-power ARM Cortex-M MCUs; 1M endurance supports daily parameter updates over 10+ years. |
Use Scenario: Retaining sensor offset/gain coefficients and patient-specific therapy profiles in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for FDA-required calibration records; WP pin hardwired to prevent field modification. Use Value: Block protection isolates calibration sectors from user-accessible settings; 100-year data retention meets medical device regulatory archiving mandates. |
| Automotive Body Control Module | Smart Energy Meter Firmware Settings |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in 12 V automotive systems with transient-suppressed 5 V rails. IC Role / Device Role / Timing Role: SPI EEPROM interfaced to 8-bit automotive MCU; withstands load-dump transients via 6.25 V absolute max rating. Use Value: 5.5 V max VCC and −55°C to +125°C absolute ratings ensure robustness in under-hood environments; HOLD pin enables safe interrupt handling during CAN message bursts. |
Use Scenario: Storing tariff schedules, demand-response thresholds, and communication credentials in ANSI C12.22-compliant electricity meters deployed in utility grids. IC Role / Device Role / Timing Role: Tamper-evident configuration store accessed during meter initialization and remote firmware updates over PLC or RF links. Use Value: Hardware WP + status register lock prevents unauthorized credential changes; 32-byte page writes accelerate secure OTA update staging. |
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 | STMicroelectronics 64 Kbit SPI EEPROM; identical 1.8–5.5 V range and 8-lead SOIC package but rated for −40°C to +125°C extended temp | Preferred for under-hood automotive use where >+85°C ambient occurs; lacks HOLD pin support | Select when extended temperature grade and AEC-Q100 qualification are mandatory; verify HOLD functionality not required in host design |
| BR24G64FJ-WE2 | Rohm 64 Kbit I²C EEPROM; 1.7–5.5 V supply, 400 kHz max clock, 16-byte page size, and built-in error correction (ECC) | Suitable for systems with I²C-only buses; ECC enhances reliability in high-radiation environments like smart grid substations | Choose when I²C interface simplifies BOM over SPI; accept slower write speed and smaller page size for enhanced data integrity |
Compared with M95640-DRMN6TP/K and BR24G64FJ-WE2, the AT25640-10PI-1.8 offers unique HOLD pin functionality for interrupt-safe SPI transactions and broader industrial temperature validation, while its 32-byte page size delivers faster bulk writes than the I²C alternative's 16-byte limit.
Availability
AT25640-10PI-1.8 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive body electronics, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT25640-10PI-1.8 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 acquired Atmel in 2016 and maintains full support for legacy Atmel memory products, offering long-term supply assurance and technical documentation continuity.
The AT25640-10PI-1.8 belongs to Microchip's legacy serial EEPROM portfolio designed for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal pin count and board space.
FAQ
What is the minimum supply voltage required for reliable operation of the AT25640-10PI-1.8?
The AT25640-10PI-1.8 operates reliably from 1.8 V to 5.5 V, with all DC and AC specifications fully characterized across this range. At 1.8 V, it maintains 0.5 MHz maximum SCK frequency, 1.0 µA standby current, and valid VOL2/VOH2 output levels - making it suitable for direct integration with 1.8 V FPGAs and ultra-low-power microcontrollers without level shifters.
Does the AT25640-10PI-1.8 support SPI Mode 0 and Mode 3 simultaneously?
The AT25640-10PI-1.8 supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) but does not auto-detect mode. The host MCU must configure its SPI peripheral to match one of these two modes before initiating communication; mixing modes within a single session will cause data corruption.
How does the HOLD pin function during an active AT25640-10PI-1.8 SPI transaction?
During an active SPI transaction, asserting HOLD low while SCK is low suspends data transfer without resetting the internal address counter or command state. The SO pin enters high-impedance, and SI inputs are ignored. Resuming requires bringing HOLD high while SCK remains low - then normal clocking resumes from the exact bit position where it paused, preserving transaction integrity.
Can the AT25640-10PI-1.8 be used in automotive applications requiring AEC-Q200 qualification?
The AT25640-10PI-1.8 itself is not AEC-Q200 qualified; however, Microchip offers automotive-grade variants (e.g., AT25640-10PI-1.8A) with extended temperature screening (−40°C to +125°C) and additional reliability testing. For AEC-Q200 compliance, specify the "A" suffix part number and confirm qualification status in the latest Microchip Automotive Product Selector Guide.
What happens if a WRITE command is issued to a memory address within a block protected by the AT25640-10PI-1.8 status register?
If a WRITE command targets an address in a block protected by BP0/BP1 bits (e.g., BP1=1, BP0=1 locks 0x0000–0x1FFF), the AT25640-10PI-1.8 ignores the data and completes the command without error. No status flag is set, and the original memory content remains unchanged - providing silent fail-safe behavior for critical configuration regions.
AT25640-10PI-1.8 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:
- 1.8V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25640-10PI-1.8 FAQ
1.How can I place an order for AT25640-10PI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640-10PI-1.8 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-1.8 reliable?
The price and inventory of AT25640-10PI-1.8 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-1.8 is usually 5 days.
3.What payment methods are accepted for AT25640-10PI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640-10PI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640-10PI-1.8?
AT25640-10PI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640-10PI-1.8 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-1.8?
For technical support, including AT25640-10PI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640-10PI-1.8 requirements.
6.How does Aetrix verify that AT25640-10PI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25640-10PI-1.8 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-1.8 meets industry standards.
7.What is the process for return or replacement of AT25640-10PI-1.8?
All AT25640-10PI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25640-10PI-1.8, 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-1.8 part is unused and in its original packaging.
Return procedure for AT25640-10PI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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