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Microchip Technology AT25256-10CC
- Part No.:
- AT25256-10CC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TDFN
- Datasheet:
-
AT25256-10CC.pdf
- Description:
- IC EEPROM 256KBIT SPI 3MHZ 8LAP
- Quantity:
- Payment:
- Shipping:
Inventory:2,378
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Product details
Overview
AT25256-10CC from Atmel (now Microchip Technology) is a 256 Kbit (32,768 × 8) serial SPI EEPROM optimized for low-voltage embedded systems. It operates across 2.7V–5.5V, supports 3 MHz SPI clock rate, features hardware/software write protection via WP and HOLD pins, and delivers 100,000 write cycles with >200-year data retention - used in industrial control modules for nonvolatile parameter storage.
For engineers reviewing the AT25256-10CC datasheet, AT25256-10CC pinout, AT25256-10CC application, or AT25256-10CC equivalent, key selection criteria include its 8-pin SOIC (EIAJ) package, 64-byte page write capability, block-level write protection (1/4, 1/2, or full array), self-timed 5 ms typical write cycle, and compatibility with SPI Modes 0 and 3 in commercial temperature range (0°C to +70°C).
Technical Context
The AT25256-10CC functions as an SPI slave device with separate SI (input) and SO (output) lines, requiring CS assertion and MSB-first 8-bit op-code transmission. Its internal architecture includes a nonvolatile status register controlling BP0/BP1 block protection bits and WPEN hardware enable, all implemented using the same memory cell technology as the main array.
It supports three supply voltage ranges: 1.8V (1.8–3.6V), 2.7V (2.7–5.5V), and 5.0V (4.5–5.5V); the -10CC suffix confirms the 2.7V variant in EIAJ SOIC-8 package. The HOLD pin suspends ongoing serial transfers without resetting the sequence, while WP provides hardware-level inhibition of status register writes when WPEN = 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8 bytes) - sufficient for firmware configuration tables or calibration data in resource-constrained microcontrollers. |
| Supply Voltage Range | 2.7V to 5.5V - enables direct interface with 3.3V and 5V logic systems without level-shifting. |
| SPI Clock Frequency | Up to 3 MHz - supports fast read/write in time-critical applications like boot-time parameter loading. |
| Write Cycle Time | 5 ms typical - determines minimum delay between successive write commands; impacts real-time logging throughput. |
| Endurance | 100,000 write cycles - defines usable lifetime under frequent reconfiguration (e.g., energy meter tariff updates). |
| Data Retention | >200 years - ensures long-term reliability in unpowered storage for medical or infrastructure equipment. |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade industrial control panels and consumer electronics. |
Pinout & Package
AT25256-10CC is housed in an 8-pin EIAJ SOIC package (0.200" wide), with standard pinout matching JEDEC SOIC-8 mechanical dimensions and thermal profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-low enable signal; must be low to accept SPI commands; high-Z output state when deasserted. |
| 2 (SCK) | Serial Clock Input | Master-generated clock synchronizing all data transfers; supports SPI Modes 0 and 3 only. |
| 3 (SI) | Serial Data Input | Receives op-codes, addresses, and write data; latched on SCK rising edge in Mode 0. |
| 4 (SO) | Serial Data Output | Drives read data and status bits; tri-stated when CS is high or during HOLD assertion. |
| 5 (WP) | Write Protect Input | Hardware lock for status register writes when WPEN = 1; no effect on unprotected memory regions. |
| 6 (HOLD) | Serial Transfer Suspend | Pauses ongoing SPI communication without resetting address counter; requires SCK low to assert. |
| 7 (GND) | Ground Reference | Signal and power return path; must be low-impedance to maintain noise immunity during write cycles. |
| 8 (VCC) | Power Supply | Primary supply input; decoupling capacitor (0.1 µF) required within 10 mm for stable 3 MHz operation. |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte Page Write | Enables burst programming of up to 64 contiguous bytes per write command, reducing host MCU overhead vs. byte-by-byte writes. |
| Block Write Protection | Configurable via status register to lock top 1/4 (6000–7FFFh), top 1/2 (4000–7FFFh), or entire (0000–7FFFh) memory array against accidental overwrite. |
| Hardware + Software Protection | Combines WP pin control (when WPEN = 1) with WREN/WRDI instructions for layered security in field-upgradable devices. |
| Self-timed Write Cycle | Eliminates need for external timing control; host reads RDY bit via RDSR instruction to detect completion. |
| ESD Robustness | >4000V HBM rating - reduces risk of damage during board handling and in-system programming. |
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 automation. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to ARM Cortex-M4-based controller via SPI bus at 2 MHz. Use Value: Enables field reconfiguration without firmware update; block protection prevents corruption during power-loss events during parameter upload. |
Use Scenario: Retaining sensor offset/gain coefficients and patient-specific therapy settings in portable infusion pumps. IC Role / Device Role / Timing Role: Secure parameter store accessed during boot and runtime; WP pin tied to system security controller. Use Value: Meets IEC 62304 Class C data integrity requirements via dual hardware/software write lock and 100K endurance. |
| Smart Energy Meter Firmware Logs | Automotive Body Control Module Settings |
Use Scenario: Recording tamper events, voltage sags, and tariff switch history in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: High-reliability log buffer written every 15 minutes; uses page write to minimize wear on hot sectors. Use Value: >200-year retention ensures data validity over full product lifecycle; 2.7V operation supports brown-out resilience during grid instability. |
Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in 12V automotive body control units. IC Role / Device Role / Timing Role: SPI EEPROM co-located with Infineon AURIX TC3xx MCU; powered from 3.3V LDO rail. Use Value: HOLD pin allows safe suspension during CAN bus interrupt servicing; 8-pin SOIC footprint minimizes PCB area in space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-WMN6TP | STMicroelectronics 256 Kbit SPI EEPROM; 2.5–5.5V supply; 20 MHz max clock; 5 ms write cycle; SOIC-8 package. | Higher SPI speed enables faster bulk reads; identical pinout and protection scheme but lacks HOLD pin functionality. | Select when higher throughput is critical and HOLD is unused; verify WPEN-equivalent status register behavior in system-level validation. |
| BR25L256FJ-WE2 | Rohm 256 Kbit SPI EEPROM; 1.7–5.5V supply; 10 MHz max clock; 5 ms write cycle; SOP-8 (JEDEC) package. | Wider voltage range supports 1.8V microcontrollers; same block protection model but uses different op-code set (e.g., WRSR = 0100 0001). | Prefer for ultra-low-power designs with 1.8V hosts; confirm software driver compatibility due to op-code divergence. |
Compared with M95256-WMN6TP and BR25L256FJ-WE2, AT25256-10CC offers unique HOLD pin support for deterministic SPI pause/resume - critical in real-time interrupt-driven systems - while maintaining identical 8-pin SOIC footprint and 2.7V–5.5V operation, making it optimal for industrial control where timing predictability outweighs raw speed.
Availability
AT25256-10CC is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostics equipment, smart utility meters, and automotive body electronics requiring stable component supply across extended production lifecycles.
Supply support for AT25256-10CC 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, now part of Microchip Technology, designs high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets.
The AT25xxx family was engineered specifically for robust SPI-based parameter storage in harsh environments, emphasizing write endurance, data retention, and flexible voltage operation - directly addressing design needs in programmable logic controllers and field-deployed instrumentation.
FAQ
What is the operating voltage range for the AT25256-10CC?
The AT25256-10CC operates from 2.7V to 5.5V, as indicated by the "-2.7" suffix in its full ordering code AT25256-10CC-2.7. This dual-range capability allows seamless integration with both 3.3V and 5V microcontroller systems without external level shifters, and is validated across the commercial temperature range (0°C to +70°C).
Does the AT25256-10CC support SPI Mode 0 and Mode 3 only?
Yes, the AT25256-10CC explicitly supports SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as documented in its feature list and timing diagrams. It does not support Modes 1 or 2; attempting to use unsupported modes will result in corrupted data transfers or failed command recognition.
How does the HOLD pin function during an active SPI transaction on the AT25256-10CC?
During an active SPI transaction, asserting HOLD low (while SCK is low) pauses communication without resetting the internal address counter or command state. The SO pin enters high-impedance, and SI inputs are ignored. To resume, bring HOLD high while SCK remains low - the transaction continues from the exact bit position where it was suspended. This behavior is fully defined in the AT25256-10CC functional description.
Can the AT25256-10CC be used in automotive applications?
The AT25256-10CC is rated for commercial temperature range (0°C to +70°C) and is not qualified to AEC-Q100. For automotive cabin or body applications requiring extended temperature support (-40°C to +125°C), the pin-compatible AT25256-10CI (industrial grade) or automotive-grade variants like AT25256-10XU should be selected instead - the AT25256-10CC itself is intended for industrial and consumer equipment.
What is the maximum clock frequency supported by the AT25256-10CC?
The AT25256-10CC supports a maximum SCK clock frequency of 3.0 MHz under 4.5–5.5V conditions, 2.1 MHz under 2.7–5.5V, and 0.5 MHz under 1.8–3.6V. Since the AT25256-10CC is the 2.7V variant, its guaranteed maximum is 2.1 MHz - though many designs successfully operate at 3 MHz with margin; always validate timing margins per AC Characteristics table in the datasheet.
AT25256-10CC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TDFN
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K 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-LAP (5x6)
AT25256-10CC FAQ
1.How can I place an order for AT25256-10CC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256-10CC 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 AT25256-10CC reliable?
The price and inventory of AT25256-10CC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25256-10CC is usually 5 days.
3.What payment methods are accepted for AT25256-10CC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256-10CC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256-10CC?
AT25256-10CC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256-10CC 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 AT25256-10CC?
For technical support, including AT25256-10CC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256-10CC requirements.
6.How does Aetrix verify that AT25256-10CC is sourced from the original manufacturer or authorized distributors?
All AT25256-10CC 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 AT25256-10CC meets industry standards.
7.What is the process for return or replacement of AT25256-10CC?
All AT25256-10CC units undergo pre-shipment inspection (PSI). If there is an issue with AT25256-10CC, 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 AT25256-10CC part is unused and in its original packaging.
Return procedure for AT25256-10CC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25256-10CC Tags
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