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Microchip Technology AT25640N-10SC
- Part No.:
- AT25640N-10SC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25640N-10SC.pdf
- Description:
- IC EEPROM 64KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,769
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Product details
Overview
AT25640N-10SC from Atmel (now Microchip) is a 64 Kbit SPI serial EEPROM organized as 8192 × 8-bit memory, supporting 2.7V–5.5V operation, 3.0 MHz clock rate at 5V, 32-byte page write, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in microcontroller-based industrial control modules requiring robust data retention.
For engineers reviewing the AT25640N-10SC datasheet, AT25640N-10SC pinout, AT25640N-10SC application, or AT25640N-10SC equivalent, key selection criteria include VCC operating range (2.7–5.5 V), tWC max = 10 ms, block write protection granularity (1/4, 1/2, or full array), and JEDEC SOIC-8 package compatibility with legacy PCB footprints.
Technical Context
The AT25640N-10SC implements a synchronous SPI slave interface compliant with Modes 0 and 3, using separate SI (input) and SO (output) pins for full-duplex communication. Its internal architecture includes an 8-bit instruction register, status register with RDY/BUSY flag, and nonvolatile BP0/BP1/WPEN bits controlling memory segment protection.
It features self-timed internal write cycles (typ. 5 ms), no external erase requirement, and supports HOLD pin suspension of ongoing serial transfers without sequence reset. Block write protection is enforced by status register configuration, and hardware write protection is enabled only when WPEN = 1 and WP = low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8-bit), enabling storage of firmware calibration tables or device configuration profiles |
| Supply Voltage Range | 2.7 V to 5.5 V - supports dual-rail systems and brown-out tolerant designs without level shifters |
| Max Clock Frequency | 3.0 MHz at VCC = 5.0 V - enables fast parameter reads during boot-up sequences |
| Page Write Size | 32 bytes - optimizes write efficiency for burst configuration updates while minimizing wear on individual pages |
| Write Cycle Time | 10 ms max - defines minimum interval between successive write commands; impacts real-time logging latency |
| Endurance & Retention | 1 million write cycles / 100 years data retention - suitable for field-deployed equipment with infrequent but critical writes |
| Operating Temperature | -40°C to +85°C - qualified for industrial ambient environments including factory automation controllers |
Pinout & Package
AT25640N-10SC is packaged in an 8-lead JEDEC SOIC (8S1) with 150-mil body width, compatible with standard SOIC-8 footprints and reflow soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for entire SPI transaction; controls SO high-impedance state when deasserted |
| SCK | Serial Clock | Master-generated clock input; timing reference for SI sampling and SO output; supports up to 3 MHz at 5V |
| SI | Serial Data Input | Receives op-codes, addresses, and write data MSB-first; ignored unless CS is low and WREN executed |
| SO | Serial Data Output | Drives read data MSB-first; enters high-Z when CS high or HOLD active; requires external pull-up for open-drain compatibility |
| GND | Ground Reference | Primary return path for VCC current and logic signals; must be low-impedance to minimize noise coupling into SPI lines |
| VCC | Power Supply | Single supply input (2.7–5.5 V); powers internal logic, charge pump, and I/O buffers; bypass capacitor required |
| WP | Write Protect | Hardware lock for status register writes when WPEN = 1; prevents accidental configuration corruption during power transitions |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting address counter; allows MCU to service higher-priority interrupts mid-read/write |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperates with diverse MCUs (e.g., AVR, PIC, STM32) without protocol translation or software workarounds |
| 32-byte Page Write | Reduces total programming time for multi-byte updates versus byte-wise writes; improves system responsiveness |
| Four-Tier Block Protection | Enables selective lockdown of configuration sectors (e.g., protect bootloader params while allowing runtime tuning) |
| WP Pin + Software Lock | Dual-layer protection prevents both electrical glitches and firmware bugs from corrupting critical settings |
| Self-Timed Write Cycle | Eliminates need for external timing control or polling overhead; simplifies driver implementation and reduces CPU load |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during cold start and runtime updates via SPI from ARM Cortex-M7 host. Use Value: Ensures deterministic boot behavior and retains calibrated values across 10+ year deployments without battery backup. |
Use Scenario: Holding sensor offset/gain coefficients and regulatory compliance logs in portable diagnostic instruments subject to frequent power cycling. IC Role / Device Role / Timing Role: Secure parameter vault interfaced to MSP430F5xx via 1 MHz SPI; WP pin tied to system security controller. Use Value: Guarantees FDA-required traceability of calibration history with tamper-resistant write protection. |
| Automotive Body Control Module | Smart Energy Meter Firmware Settings |
Use Scenario: Saving seat/mirror position presets and lighting profiles in 12V automotive BCMs operating across -40°C to +85°C. IC Role / Device Role / Timing Role: SPI EEPROM co-located with Infineon AURIX TC3xx; uses HOLD to defer writes during CAN bus arbitration windows. Use Value: Meets AEC-Q100 Grade 2 requirements and eliminates EEPROM wear-out concerns over 15-year vehicle lifecycle. |
Use Scenario: Storing tariff schedules, meter ID, and cryptographic keys in ANSI C12.22-compliant smart meters with remote firmware updates. IC Role / Device Role / Timing Role: Trusted configuration store accessed only after secure boot validation; protected via BP1/BP0 = 11 (full-array lock). Use Value: Prevents unauthorized parameter modification while enabling field-upgradable billing logic via authenticated OTA payloads. |
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 | Same 64 Kbit density, SPI interface, and SOIC-8 package; max clock 20 MHz at 5V; write cycle 5 ms typical; supports 1.8–5.5 V | Better high-speed performance and wider voltage range; lacks HOLD pin - unsuitable for interrupt-driven suspend use cases | Select when system requires >3 MHz SPI throughput or 1.8 V operation; verify HOLD functionality is not needed in host firmware |
| BR24G64FJ-WE2 | I²C interface (not SPI); 64 Kbit; TSSOP-8; 1 MHz max clock; 5 ms write cycle; 1.7–5.5 V operation | Requires I²C master instead of SPI; no HOLD or WP pin; uses different addressing and command set | Choose only if board already uses I²C peripherals and SPI resources are constrained; redesign required for pinout and driver stack |
Compared with M95640-DRMN6TP/K and BR24G64FJ-WE2, the AT25640N-10SC offers guaranteed HOLD support and precise 2.7–5.5 V compatibility ideal for mixed-voltage industrial designs, whereas alternatives trade interface flexibility for speed or voltage breadth.
Availability
AT25640N-10SC is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT25640N-10SC 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
Atmel Corporation (acquired by Microchip Technology in 2016) is a semiconductor innovator specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for embedded systems.
The AT25xxx family was designed specifically for reliable, low-power serial EEPROM replacement in resource-constrained MCU applications where SPI simplicity and robust data integrity are critical.
FAQ
What is the maximum clock frequency supported by the AT25640N-10SC at 3.3 V operation?
The AT25640N-10SC supports up to 2.1 MHz at VCC = 2.7–5.5 V per AC Characteristics table. At 3.3 V, this remains the limiting factor - not 3.0 MHz (which applies only at 4.5–5.5 V). Designers must configure SPI peripherals accordingly to avoid setup/hold violations.
Does the AT25640N-10SC require an external erase command before writing new data?
No. The AT25640N-10SC performs automatic erase during each write cycle - no separate ERASE instruction is needed. This simplifies firmware development and eliminates risk of incomplete erasure causing data corruption. Write operations begin immediately after CS goes high following address/data transmission.
How does the HOLD pin function during an ongoing READ operation on the AT25640N-10SC?
When HOLD is asserted low during a READ, the AT25640N-10SC suspends data output on SO and freezes the internal address counter. SCK may continue toggling, but SI input is ignored. Resuming requires bringing HOLD high while SCK is low - then reading resumes from the same address without restart overhead.
Can the AT25640N-10SC be used in a 1.8 V system?
No - the AT25640N-10SC variant is rated for 2.7–5.5 V only. For 1.8 V operation, the correct part is AT25640N-10SC-1.8 (ordering code suffix -1.8), which has distinct DC/AC specs including reduced fSCK max = 0.5 MHz and higher tWC max = 20 ms.
What happens if a WRITE command is issued to a block-protected address range on the AT25640N-10SC?
If the target address falls within a region protected by BP0/BP1 bits in the status register, the AT25640N-10SC ignores the WRITE instruction entirely. No error flag is set, and the device remains responsive to subsequent commands - requiring host firmware to validate protection settings before initiating writes.
AT25640N-10SC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25640N-10SC FAQ
1.How can I place an order for AT25640N-10SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640N-10SC 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 AT25640N-10SC reliable?
The price and inventory of AT25640N-10SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25640N-10SC is usually 5 days.
3.What payment methods are accepted for AT25640N-10SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640N-10SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640N-10SC?
AT25640N-10SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640N-10SC 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 AT25640N-10SC?
For technical support, including AT25640N-10SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640N-10SC requirements.
6.How does Aetrix verify that AT25640N-10SC is sourced from the original manufacturer or authorized distributors?
All AT25640N-10SC 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 AT25640N-10SC meets industry standards.
7.What is the process for return or replacement of AT25640N-10SC?
All AT25640N-10SC units undergo pre-shipment inspection (PSI). If there is an issue with AT25640N-10SC, 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 AT25640N-10SC part is unused and in its original packaging.
Return procedure for AT25640N-10SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25640N-10SC Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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