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Microchip Technology AT25640A-10TI-1.8
- Part No.:
- AT25640A-10TI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT25640A-10TI-1.8.pdf
- Description:
- IC EEPROM 64KBIT SPI 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
AT25640A-10TI-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, 20 MHz clock rate at 5 V, 32-byte page write, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in automotive control modules requiring extended temperature reliability.
For engineers reviewing the AT25640A-10TI-1.8 datasheet, AT25640A-10TI-1.8 pinout, AT25640A-10TI-1.8 application, or AT25640A-10TI-1.8 equivalent, key selection criteria include low-voltage 1.8 V compatibility, industrial temperature range (−40°C to +85°C), TSSOP-8 packaging, block write protection granularity, and self-timed 5 ms max write cycle.
Technical Context
The AT25640A-10TI-1.8 implements a synchronous SPI slave interface compliant with Modes 0 and 3, using separate SI/SO lines and CS-controlled selection. Its internal architecture includes an 8-bit instruction register, status register with BP0/BP1/WPEN bits, and automatic address incrementing during read sequences.
Write operations require explicit WREN instruction prior to WRITE, with status register polling (RDSR) for RDY/BUSY flag monitoring. Block protection covers 0%, 25%, 50%, or 100% of the 8192-word array based on BP0/BP1 settings, while HOLD pin enables serial communication suspension without sequence reset.
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 Range | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V logic systems without level shifting |
| Max Clock Frequency | 20 MHz at VCC = 5.0 V - enables high-throughput configuration reads in real-time control loops |
| Page Write Size | 32 bytes - minimizes write latency versus byte-write-only EEPROMs and reduces host MCU overhead |
| Write Cycle Time | 5 ms maximum - defines worst-case delay before next command can be issued after write initiation |
| Endurance & Retention | 1 million write cycles / 100 years data retention - ensures long-term reliability in infrequently updated but mission-critical storage |
| Operating Temperature | −40°C to +85°C - qualified for under-hood automotive and industrial environments |
Pinout & Package
AT25640A-10TI-1.8 uses an 8-lead TSSOP package (JEDEC MO-153, 3.0 mm × 4.4 mm body, 0.65 mm pitch) with gull-wing leads.
| 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 synchronized to master; determines timing for SI sampling and SO output |
| SI | Serial Data Input | Receives op-codes, addresses, and data; MSB-first transmission required |
| SO | Serial Data Output | Tri-state output delivering read data or status bits; high-Z when CS is high or HOLD is active |
| WP | Write Protect | Hardware lock for status register writes when WPEN = 1; no effect if WPEN = 0 |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting internal address counter or state machine |
| VCC | Power Supply | Single supply input supporting 1.8–5.5 V; powers internal logic and memory array |
| GND | Ground | Reference return path for all I/O and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| 1.8 V Operation | Enables direct integration into ultra-low-power microcontroller subsystems without voltage translation |
| Block Write Protection | Configurable 0%/25%/50%/100% memory locking via nonvolatile BP0/BP1 bits in status register |
| Self-timed Write Cycle | Eliminates need for external timing control or busy-wait loops; host polls RDSR RDY bit instead |
| HOLD Pin Functionality | Preserves serial context during interrupt servicing or bus arbitration, avoiding retransmission overhead |
| Automotive Grade Qualification | Meets AEC-Q100 stress test requirements for extended temperature and reliability in vehicle ECUs |
Applications
| Engine Control Unit (ECU) | Industrial PLC Configuration |
|---|---|
Use Scenario: Storing fuel map calibration tables and fault code history across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 100-year retention and 1M endurance for field-updatable maps. Use Value: Eliminates battery-backed SRAM; supports zero-power retention and eliminates recalibration after power loss. | Use Scenario: Holding I/O module configuration profiles and ladder logic checksums in modular automation controllers. IC Role / Device Role / Timing Role: SPI-configurable memory for runtime-reloadable firmware assets with hardware write lock during execution. Use Value: Enables secure field updates without risk of accidental corruption during hot-swap or brownout events. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Recording dose history, alarm logs, and user-defined therapy profiles with tamper-resistant storage. IC Role / Device Role / Timing Role: Secure, low-voltage (1.8 V) EEPROM with WP pin hardwired to prevent unauthorized writes during operation. Use Value: Meets IEC 62304 data integrity requirements while reducing system BOM by eliminating external protection circuitry. | Use Scenario: Archiving tariff schedules, metering registers, and cryptographic keys in utility-grade meters operating at −40°C to +85°C. IC Role / Device Role / Timing Role: High-reliability serial EEPROM with extended temperature qualification and 25% block protection for critical firmware sectors. Use Value: Ensures regulatory compliance for 20+ year field deployment without data degradation or write failure. |
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; 1.8–5.5 V, 20 MHz, TSSOP-8, but lacks HOLD pin and uses different status register layout | No HOLD functionality limits use in interrupt-sensitive real-time systems requiring pause/resume capability | Select AT25640A-10TI-1.8 when HOLD support or Atmel-compatible instruction set is required |
| BR24G64FJ-WE2 | Rohm 64 Kbit SPI EEPROM; 1.7–5.5 V, 10 MHz max, TSSOP-8, supports 16-byte page write vs. 32-byte, and offers different BP granularity | Lower max clock rate and smaller page size increase write time by ~2× for full-array updates | Choose AT25640A-10TI-1.8 for higher throughput or when matching existing Atmel-based firmware drivers |
Compared with M95640-DRMN6TP/K and BR24G64FJ-WE2, the AT25640A-10TI-1.8 delivers superior real-time responsiveness via HOLD pin support and faster 32-byte page writes, making it optimal for automotive and industrial control where deterministic timing and robust suspend/resume behavior are essential.
Availability
AT25640A-10TI-1.8 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC configuration storage, and medical device data logging requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT25640A-10TI-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.
The AT25640A-10TI-1.8 belongs to Microchip's legacy Atmel SPI EEPROM product line, engineered for robust nonvolatile storage in automotive, industrial, and medical systems demanding low-voltage operation and extended temperature reliability.
FAQ
What is the memory organization of the AT25640A-10TI-1.8?
The AT25640A-10TI-1.8 contains 64 Kbit of serial EEPROM memory organized as 8192 words × 8 bits. This structure supports byte-level random access and sequential read/write operations with automatic address incrementing, making it ideal for storing configuration data, calibration values, or event logs in resource-constrained embedded systems.
Does the AT25640A-10TI-1.8 support both 1.8 V and 5.5 V operation simultaneously?
No - the AT25640A-10TI-1.8 operates across a single supply range of 1.8 V to 5.5 V, meaning it functions correctly at any voltage within that span, including 1.8 V, 3.3 V, or 5.0 V. It does not require dual supplies and maintains full SPI functionality and timing compliance across the entire range, as verified in DC and AC characteristics tables.
How does the HOLD pin function during an active SPI transaction in the AT25640A-10TI-1.8?
When the HOLD pin is asserted low while SCK is low during an active SPI transaction, the AT25640A-10TI-1.8 suspends communication without resetting the internal address counter or instruction state. SI inputs are ignored and SO enters high-impedance. Resuming requires bringing HOLD high while SCK remains low - the transaction continues from the exact point of suspension, preserving data integrity and eliminating reinitialization overhead.
What protection mechanisms prevent unintended writes to the AT25640A-10TI-1.8?
The AT25640A-10TI-1.8 provides three-tiered write protection: (1) software-based via WREN/WRDI instructions and status register WEN bit; (2) hardware-based via the WP pin when WPEN = 1; and (3) block-level via BP0/BP1 bits enabling 0%, 25%, 50%, or 100% memory array lockdown. All layers operate concurrently and are validated in the device's functional description and timing diagrams.
Is the AT25640A-10TI-1.8 pin-compatible with other variants in the AT25xxxA family?
Yes - the AT25640A-10TI-1.8 shares identical 8-lead TSSOP pinout and SPI interface protocol with AT25080A, AT25160A, and AT25320A variants. Differences lie solely in memory density (8K/16K/32K/64K) and ordering suffixes; all use CS/SCK/SI/SO/WP/HOLD/VCC/GND mapping and support the same instruction set, enabling drop-in replacement where capacity permits.
AT25640A-10TI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- 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-TSSOP
AT25640A-10TI-1.8 FAQ
1.How can I place an order for AT25640A-10TI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640A-10TI-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 AT25640A-10TI-1.8 reliable?
The price and inventory of AT25640A-10TI-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 AT25640A-10TI-1.8 is usually 5 days.
3.What payment methods are accepted for AT25640A-10TI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640A-10TI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640A-10TI-1.8?
AT25640A-10TI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640A-10TI-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 AT25640A-10TI-1.8?
For technical support, including AT25640A-10TI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640A-10TI-1.8 requirements.
6.How does Aetrix verify that AT25640A-10TI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25640A-10TI-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 AT25640A-10TI-1.8 meets industry standards.
7.What is the process for return or replacement of AT25640A-10TI-1.8?
All AT25640A-10TI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25640A-10TI-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 AT25640A-10TI-1.8 part is unused and in its original packaging.
Return procedure for AT25640A-10TI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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