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Microchip Technology AT25640AY1-10YI-1.8
- Part No.:
- AT25640AY1-10YI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT25640AY1-10YI-1.8.pdf
- Description:
- IC EEPROM 64KBIT SPI 20MHZ 8MAP
- Quantity:
- Payment:
- Shipping:
Inventory:3,534
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Product details
Overview
AT25640AY1-10YI-1.8 from Microchip Technology (formerly Atmel) is a 64 Kbit SPI serial EEPROM organized as 8192 × 8-bit memory, operating from 1.8 V to 5.5 V, supporting 20 MHz clock rate at 5 V, featuring 32-byte page write, block write protection, and automotive-grade industrial temperature range (−40°C to +85°C). It serves as nonvolatile configuration storage in microcontroller-based automotive control modules.
For engineers reviewing the AT25640AY1-10YI-1.8 datasheet, AT25640AY1-10YI-1.8 pinout, AT25640AY1-10YI-1.8 application, or AT25640AY1-10YI-1.8 equivalent, key selection considerations include 1.8 V low-voltage operation, TSSOP-compatible 8Y1 MAP package footprint, hardware/software write protection, 1 million endurance cycles, and −40°C to +85°C industrial qualification.
Technical Context
The AT25640AY1-10YI-1.8 implements a synchronous SPI slave interface compliant with Modes 0 and 3, using CS, SCK, SI, and SO signals for command-driven read/write operations. Its internal architecture includes an 8-bit instruction register, status register with BP0/BP1/WPEN bits, and automatic address incrementing during sequential reads.
Write enable requires explicit WREN instruction prior to WRITE or WRSR commands; all writes are self-timed (≤5 ms), with no separate erase cycle needed. Block protection is configurable via status register to lock 0%, 25%, 50%, or 100% of the 8192-word array, enforced by both WP pin (when WPEN=1) and software instructions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8-bit), sufficient for firmware parameter tables or calibration data in compact embedded systems |
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V logic families without level shifters |
| Max Clock Frequency | 20 MHz at VCC = 5 V - supports high-throughput configuration loading in real-time control loops |
| Page Write Size | 32 bytes - balances programming speed and wear leveling across memory pages |
| Endurance & Retention | 1 million write cycles / 100 years data retention - meets long-life requirements for automotive ECUs and industrial controllers |
| Operating Temperature | −40°C to +85°C - qualified for under-hood and factory-floor environments without derating |
| Write Cycle Time | 5 ms maximum - deterministic timing allows precise host-side timeout management |
Pinout & Package
AT25640AY1-10YI-1.8 uses an 8-lead Miniature Array Package (MAP), 4.90 mm × 3.00 mm body, non-leaded, dual-footprint compatible with TSSOP layouts. Pin 1 is marked by index area in top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire SPI transaction; controls SO output state (high-Z when high) |
| SCK | Serial Clock | Master-generated clock; device operates as SPI slave only; timing-critical for setup/hold compliance |
| SI | Serial Data Input | Receives op-codes, addresses, and write data MSB-first; ignored during HOLD or when CS is high |
| SO | Serial Data Output | Drives read data MSB-first; enters high-impedance state when CS goes high or HOLD is asserted |
| GND | Ground Reference | Primary return path for VCC current and signal references; requires low-impedance PCB connection |
| VCC | Power Supply | Single supply input (1.8–5.5 V); decoupling capacitor (0.1 µF) required within 10 mm of pin |
| WP | Write Protect | Hardware lock for status register and protected memory blocks when WPEN=1; tied high for full write access |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting sequence; requires SCK low before assertion |
Key Features
| Feature | Design Value |
|---|---|
| 1.8 V Operation Support | Enables direct integration with ultra-low-power MCUs (e.g., ARM Cortex-M0+) without voltage translation |
| Block Write Protection | Four configurable protection levels (none, 1/4, 1/2, full array) prevent accidental overwrites of critical calibration or security keys |
| Hardware + Software Write Protection | WP pin and WRSR instruction provide layered defense: physical lock plus programmable policy enforcement |
| Automotive-Grade Qualification | Meets AEC-Q100 stress test requirements for temperature cycling, HTOL, and ESD - suitable for Tier-1 ECU designs |
| Miniature MAP Package (8Y1) | 4.9 mm × 3.0 mm footprint saves board space vs. SOIC/TSSOP while maintaining thermal performance and reworkability |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing fuel map coefficients, sensor calibration offsets, and fault code history in engine management systems. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via SPI during boot and runtime parameter updates. Use Value: 1.8 V operation aligns with modern 1.8 V MCU I/O rails; 100-year retention ensures data integrity over vehicle lifetime. |
Use Scenario: Holding ladder logic parameters, I/O mapping tables, and user-defined alarm thresholds in modular PLCs. IC Role / Device Role / Timing Role: SPI EEPROM providing persistent storage for field-updatable operational settings. Use Value: Block protection prevents corruption of safety-critical configuration blocks during firmware upgrades. |
| Medical Infusion Pump Calibration | Smart Meter Firmware Parameters |
Use Scenario: Securing drug delivery rate profiles, pump motor calibration constants, and usage audit logs. IC Role / Device Role / Timing Role: Tamper-resistant memory storing regulatory-mandated calibration data with write-lock capability. Use Value: WP pin + WPEN bit enables hardware-enforced write disable during normal operation, meeting IEC 62304 safety requirements. |
Use Scenario: Storing tariff schedules, metering algorithm coefficients, and communication protocol keys in utility smart meters. IC Role / Device Role / Timing Role: Low-power serial EEPROM retaining time-of-use billing parameters across power cycles. Use Value: 0.1 µA standby current at 1.8 V minimizes battery drain in battery-backed meters. |
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 DW | STMicroelectronics 64 Kbit SPI EEPROM; same 1.8–5.5 V range, 20 MHz max, but uses standard SOIC-8 (8S1) not MAP (8Y1) | Lacks miniature MAP footprint; requires PCB layout change; identical functional behavior and timing | Select if SOIC-8 compatibility is prioritized over board space savings and thermal profile |
| BR24G64FJ-3GE2 | Rohm 64 Kbit SPI EEPROM; supports 1.7–5.5 V, 10 MHz max at 1.7 V, offered in TSSOP-8 (8A2), not MAP | Lower max clock rate limits throughput in high-speed logging; different pinout (VCC/GND swapped vs. AT25640A) | Choose when extended 1.7 V minimum is required and TSSOP-8 is preferred over MAP for assembly process |
Compared with M95640-DW DW and BR24G64FJ-3GE2, the AT25640AY1-10YI-1.8 uniquely combines 1.8 V operation, 20 MHz speed, MAP package miniaturization, and automotive temperature qualification - enabling space-constrained, high-reliability designs where footprint and qualification are decisive.
Availability
AT25640AY1-10YI-1.8 is available at Aetrix Electronics and suitable for automotive control units, industrial PLCs, medical infusion pumps, and smart metering systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant nonvolatile memory.
Supply support for AT25640AY1-10YI-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 product support, documentation, and manufacturing continuity for the AT25xxx family of serial EEPROMs.
The AT25640AY1-10YI-1.8 belongs to Microchip's legacy Atmel SPI EEPROM product line, designed specifically for robust, low-voltage, high-reliability nonvolatile storage in automotive, industrial, and medical applications.
FAQ
What is the memory organization of the AT25640AY1-10YI-1.8?
The AT25640AY1-10YI-1.8 contains 64 Kbit of serial EEPROM memory organized as 8192 words × 8 bits. This structure supports byte-level random access and sequential reads/writes, making it ideal for storing configuration registers, calibration data, or firmware parameters in resource-constrained systems. The AT25640AY1-10YI-1.8 uses standard SPI addressing with A12–A0 bits for full 8192-word coverage.
Does the AT25640AY1-10YI-1.8 support both SPI Mode 0 and Mode 3?
Yes, the AT25640AY1-10YI-1.8 is fully compatible with SPI Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), as confirmed in its official datasheet. This dual-mode support allows seamless integration with diverse microcontrollers including legacy 68HC11 derivatives and modern ARM-based SoCs. The AT25640AY1-10YI-1.8 does not support Modes 1 or 2.
How does hardware write protection work on the AT25640AY1-10YI-1.8?
Hardware write protection on the AT25640AY1-10YI-1.8 is enabled by pulling the WP pin low *and* setting the WPEN bit (Bit 7 of status register) to "1". When active, this combination locks the status register and all memory blocks defined by BP1/BP0 bits. The AT25640AY1-10YI-1.8 ignores WRITE and WRSR commands under hardware protection, ensuring immunity to software faults or noise-induced writes.
What is the significance of the "Y1" in AT25640AY1-10YI-1.8?
The "Y1" in AT25640AY1-10YI-1.8 denotes the Miniature Array Package (MAP) variant with 4.90 mm × 3.00 mm body size and non-leaded terminations. This 8Y1 package provides dual footprint compatibility with TSSOP-8 layouts while offering improved thermal performance and reduced board area versus SOIC or PDIP. The AT25640AY1-10YI-1.8 is distinct from SOIC (8S1) or TSSOP (8A2) versions of the same device.
Can the AT25640AY1-10YI-1.8 operate reliably at 1.8 V across its full temperature range?
Yes, the AT25640AY1-10YI-1.8 is fully specified for 1.8 V to 5.5 V operation across its industrial temperature range of −40°C to +85°C. DC characteristics including ICC, ISB, VOL, and VOH are validated at 1.8 V in this range, and AC timing (e.g., tWH, tWL) meets specification down to 5 MHz at 1.8 V. The AT25640AY1-10YI-1.8 delivers guaranteed functionality without voltage boosting or derating.
AT25640AY1-10YI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MAP (3x4.9)
AT25640AY1-10YI-1.8 FAQ
1.How can I place an order for AT25640AY1-10YI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640AY1-10YI-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 AT25640AY1-10YI-1.8 reliable?
The price and inventory of AT25640AY1-10YI-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 AT25640AY1-10YI-1.8 is usually 5 days.
3.What payment methods are accepted for AT25640AY1-10YI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640AY1-10YI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640AY1-10YI-1.8?
AT25640AY1-10YI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640AY1-10YI-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 AT25640AY1-10YI-1.8?
For technical support, including AT25640AY1-10YI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640AY1-10YI-1.8 requirements.
6.How does Aetrix verify that AT25640AY1-10YI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25640AY1-10YI-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 AT25640AY1-10YI-1.8 meets industry standards.
7.What is the process for return or replacement of AT25640AY1-10YI-1.8?
All AT25640AY1-10YI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25640AY1-10YI-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 AT25640AY1-10YI-1.8 part is unused and in its original packaging.
Return procedure for AT25640AY1-10YI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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