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Microchip Technology AT25HP256-10CI-2.7
- Part No.:
- AT25HP256-10CI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TDFN
- Datasheet:
-
AT25HP256-10CI-2.7.pdf
- Description:
- IC EEPROM 256KBIT SPI 10MHZ 8LAP
- Quantity:
- Payment:
- Shipping:
Inventory:3,005
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Product details
Overview
AT25HP256-10CI-2.7 from Atmel (now Microchip) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8-bit words, designed for low-voltage embedded systems requiring nonvolatile data storage with hardware/software write protection. It operates from 2.7V to 5.5V, supports 5 MHz clock rate at 2.7V, features 128-byte page write mode, and delivers 100K write cycles with >40 years data retention. It is used in industrial sensor calibration, firmware parameter storage, and power-meter configuration.
For engineers reviewing the AT25HP256-10CI-2.7 datasheet, AT25HP256-10CI-2.7 pinout, AT25HP256-10CI-2.7 application, or AT25HP256-10CI-2.7 equivalent, key selection criteria include its 8-lead Leadless Array Package (8CN3), SPI Mode 0/3 compatibility, block write protection granularity (1/4, 1/2, or full array), HOLD/ WP pin functionality, and industrial temperature range (–40°C to +85°C).
Technical Context
The AT25HP256-10CI-2.7 implements a synchronous 3-wire SPI slave interface with dedicated SI (input) and SO (output) pins, supporting MSB-first transmission and op-code–driven command execution (e.g., WREN, WRITE, RDSR). Its internal architecture includes a nonvolatile status register with BP0/BP1 bits controlling block protection and a WPEN bit enabling hardware write protection via the WP pin.
All write operations are self-timed with no separate erase cycle required; the 10 ms max write cycle time applies to both byte and page writes. The HOLD pin suspends ongoing serial communication without resetting the sequence, and the device remains in high-impedance SO state when CS is high or during internal write cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8-bit words) - fixed capacity for compact firmware or calibration data storage |
| Supply Voltage Range | 2.7V to 5.5V - enables direct integration into 3.3V and 5V logic domains without level-shifting |
| Max Clock Frequency | 5 MHz at VCC = 2.7V - supports fast read/write in low-power industrial microcontroller interfaces |
| Write Endurance | 100,000 cycles - sufficient for frequent parameter updates in metering or control applications |
| Data Retention | >40 years at 25°C - ensures long-term reliability in unattended equipment |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient conditions without derating |
| Page Write Size | 128 bytes - optimizes burst programming efficiency while limiting bus occupancy |
Pinout & Package
AT25HP256-10CI-2.7 is housed in an 8-lead Leadless Array Package (LAP), designated 8CN3 per Atmel's packaging spec: 6.0 mm × 5.0 mm × 1.04 mm body, 1.27 mm lead pitch, bottom-exposed pad for thermal dissipation. Pin 1 is marked at top-left corner (viewed from top); pin numbering follows counter-clockwise layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: pulls device out of standby and initiates SPI command sequence on falling edge |
| SCK | Serial Clock Input | Master-generated clock synchronizing all SI/SO data transfers; supports SPI Modes 0 and 3 |
| SI | Serial Data Input | Receives op-codes, addresses, and write data; ignored during HOLD or internal write cycles |
| SO | Serial Data Output | Drives read data or status register contents; tri-states when CS is high or during write |
| WP | Write Protect Input | Hardware lock: disables status register writes when WP = low and WPEN = 1; configurable via WRSR |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting address counter; requires SCK = low to assert |
| GND | Ground Reference | Return path for VCC and all I/O signals; must be low-impedance for noise immunity |
| VCC | Power Supply | Primary supply input (2.7–5.5V); powers internal logic, memory array, and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Compatibility | Interoperates with common MCU SPI peripherals without custom timing adjustments |
| 128-Byte Page Write Only | Enforces efficient bulk writes while preventing partial-page corruption from interrupted transfers |
| Three-Tier Block Protection | Configurable via status register to lock top 1/4, top 1/2, or entire memory array against accidental overwrite |
| Dual Write Protection Scheme | Combines hardware (WP pin) and software (WREN/WRSR) controls for layered data integrity |
| HOLD Pin Functionality | Allows master to pause reads/writes mid-sequence-critical for real-time system interrupt handling |
Applications
| Industrial Sensor Calibration | Smart Energy Meter Configuration |
|---|---|
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and temperature compensation tables in environmental sensors. IC Role / Device Role / Timing Role: Nonvolatile parameter storage IC interfaced to MCU via SPI; accessed during power-up and field recalibration. Use Value: Enables field-upgradable calibration without reprogramming MCU firmware; 100K endurance supports lifetime recalibrations. |
Use Scenario: Holding tariff schedules, billing counters, and communication module settings in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Secure configuration EEPROM with WP/HOLD support for safe over-the-air updates during live grid operation. Use Value: Block write protection prevents corruption of critical billing data during brownouts or firmware updates. |
| Medical Device Setup Storage | PLC I/O Module Parameterization |
Use Scenario: Retaining user-defined alarm thresholds, display preferences, and safety limits in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-power SPI EEPROM accessed during boot and settings change; operates down to 2.7V for battery backup. Use Value: >40-year data retention ensures settings persist across device service life without capacitor-backed SRAM. |
Use Scenario: Storing channel-specific scaling factors, filter coefficients, and fault response modes in modular industrial I/O cards. IC Role / Device Role / Timing Role: Configuration memory mapped by PLC CPU via SPI; protected via WP pin tied to system security controller. Use Value: Hardware write protection prevents unauthorized modification of safety-critical I/O behavior during runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DWDW3TP/K | 256 Kbit SPI EEPROM, 1.8–5.5V, 10 MHz @ 5V, 8-lead SOIC package (not leadless) | Larger footprint; lacks HOLD pin; uses standard SOIC instead of LAP | Select if board layout already accommodates SOIC and HOLD is not required |
| BR25H256FJ-2CE2 | 256 Kbit SPI EEPROM, 1.7–5.5V, 20 MHz @ 5V, 8-lead TSSOP, built-in error correction (ECC) | Higher speed and ECC support; different pinout (SO/IO shared); no HOLD pin | Choose for high-integrity applications where bit errors must be detected/corrected in harsh EMI environments |
Compared with M95256-DWDW3TP/K and BR25H256FJ-2CE2, the AT25HP256-10CI-2.7 offers unique value in its 8CN3 leadless package for space-constrained designs, integrated HOLD functionality for deterministic interrupt handling, and precise 1/4–1/2–full array block protection granularity-features not simultaneously available in either alternative.
Availability
AT25HP256-10CI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy meter configuration, and medical device setup storage requiring stable component supply across extended product lifecycles.
Supply support for AT25HP256-10CI-2.7 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 company specializing in microcontrollers, nonvolatile memory, and secure authentication solutions.
The AT25HP256-10CI-2.7 belongs to Atmel's high-reliability SPI EEPROM product line, engineered for industrial and commercial systems demanding robust data retention, flexible voltage operation, and hardware-enforced write protection.
FAQ
What is the maximum clock frequency supported by the AT25HP256-10CI-2.7 at 2.7V?
The AT25HP256-10CI-2.7 supports a maximum SCK clock frequency of 5 MHz when operating at VCC = 2.7V, as specified in the AC Characteristics table. This allows efficient data transfer in low-voltage industrial applications without requiring external level shifters. The device maintains full functionality-including page write, status register access, and HOLD suspension-at this speed. Performance is characterized across the full –40°C to +85°C industrial temperature range.
Does the AT25HP256-10CI-2.7 support individual byte writes, or only page writes?
The AT25HP256-10CI-2.7 supports only 128-byte page writes-not individual byte writes-as explicitly stated in the datasheet: "128-byte Page Mode Only for Write Operations" and "Content of the page in the array will not be guaranteed if less than 128 bytes of data is received." Attempting a byte write results in undefined behavior; successful programming requires exactly 128 bytes per WRITE instruction to fill one page boundary-aligned block.
How does the WRITE PROTECT (WP) pin function on the AT25HP256-10CI-2.7?
The WP pin on the AT25HP256-10CI-2.7 provides hardware-level write inhibition when pulled low-but only if the WPEN bit in the status register is set to "1". When enabled, it blocks all writes to the status register (including BP0/BP1 bits) and to memory regions covered by block protection. If WPEN = 0, the WP pin has no effect. This dual-control scheme allows safe installation in systems where WP is tied to ground, yet retains ability to configure protection during initial setup.
What package type is used for the AT25HP256-10CI-2.7, and what are its key mechanical dimensions?
The AT25HP256-10CI-2.7 uses the 8-lead Leadless Array Package (LAP), designated 8CN3: 6.0 mm × 5.0 mm × 1.04 mm body size, 1.27 mm pitch, with exposed bottom pad. Pin 1 is located at the top-left corner (marked), and terminals are arranged counter-clockwise. This surface-mount package eliminates leads for improved thermal performance and higher board density compared to PDIP or SOIC variants of the same device.
Can the AT25HP256-10CI-2.7 be used in SPI Mode 1 or Mode 2, or only Modes 0 and 3?
The AT25HP256-10CI-2.7 is explicitly specified to support only SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as confirmed in the Features section and Functional Description. It does not support Mode 1 (CPOL = 0, CPHA = 1) or Mode 2 (CPOL = 1, CPHA = 0). Using unsupported modes may result in incorrect data sampling or command misinterpretation due to mismatched clock polarity and phase timing.
AT25HP256-10CI-2.7 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:
- 10 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LAP (8x5)
AT25HP256-10CI-2.7 FAQ
1.How can I place an order for AT25HP256-10CI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25HP256-10CI-2.7 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 AT25HP256-10CI-2.7 reliable?
The price and inventory of AT25HP256-10CI-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25HP256-10CI-2.7 is usually 5 days.
3.What payment methods are accepted for AT25HP256-10CI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25HP256-10CI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25HP256-10CI-2.7?
AT25HP256-10CI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25HP256-10CI-2.7 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 AT25HP256-10CI-2.7?
For technical support, including AT25HP256-10CI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25HP256-10CI-2.7 requirements.
6.How does Aetrix verify that AT25HP256-10CI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25HP256-10CI-2.7 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 AT25HP256-10CI-2.7 meets industry standards.
7.What is the process for return or replacement of AT25HP256-10CI-2.7?
All AT25HP256-10CI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25HP256-10CI-2.7, 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 AT25HP256-10CI-2.7 part is unused and in its original packaging.
Return procedure for AT25HP256-10CI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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