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Microchip Technology AT25HP256-10PI-1.8
- Part No.:
- AT25HP256-10PI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25HP256-10PI-1.8.pdf
- Description:
- IC EEPROM 256KBIT SPI 10MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,313
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Product details
Overview
AT25HP256-10PI-1.8 from Atmel (now Microchip) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8-bit memory, supporting 1.8V to 5.5V operation, 2 MHz max clock at 1.8V, 128-byte page write mode, and hardware/software write protection via WP pin and status register. It serves in industrial microcontroller systems requiring nonvolatile storage with low-voltage compatibility and robust data retention.
For engineers reviewing the AT25HP256-10PI-1.8 datasheet, AT25HP256-10PI-1.8 pinout, AT25HP256-10PI-1.8 application, or AT25HP256-10PI-1.8 equivalent, key selection criteria include 1.8V supply support, SPI Mode 0/3 compatibility, block write protection granularity (1/4, 1/2, full array), 100K endurance, and 8-lead PDIP package with HOLD/CS/SCK/SI/SO/WP/GND/VCC pinout.
Technical Context
The AT25HP256-10PI-1.8 implements a synchronous SPI slave interface with separate SI (input) and SO (output) pins, MSB-first data transfer, and no erase cycle required before write. Its internal architecture includes an 8-bit instruction register supporting WREN/WRDI/RDSR/WRSR/READ/WRITE op-codes.
Block write protection is controlled by nonvolatile BP0/BP1 bits in the status register, enabling protection of top 1/4 (0x6000–0x7FFF), top 1/2 (0x4000–0x7FFF), or entire array (0x0000–0x7FFF). The WPEN bit enables or disables hardware write protection via the WP pin, and the HOLD pin suspends ongoing serial communication without resetting the sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8), sufficient for firmware parameter storage or calibration data in space-constrained embedded designs |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interfacing with 1.8V logic families and mixed-voltage systems without level shifters |
| Max Clock Frequency | 2 MHz at 1.8V - defines maximum sustained read/write throughput under low-voltage operation |
| Write Endurance | 100,000 cycles - supports frequent configuration updates in industrial control logging applications |
| Data Retention | >40 years - ensures long-term reliability for unattended equipment and field-deployed devices |
| Page Write Size | 128 bytes - requires aligned multi-byte writes; byte-level writes are not supported |
| Operating Temperature | −40°C to +85°C - qualified for industrial ambient environments without derating |
Pinout & Package
AT25HP256-10PI-1.8 is packaged in an 8-lead PDIP (Plastic Dual In-line Package), 0.300" wide body, with standard through-hole mounting and 0.100" lead pitch. Pin 1 is marked at the top-left corner with a notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be low to accept commands; high impedance on SO when CS is high |
| SCK | Serial Clock | Input-only master-generated clock; timing critical for tWH/tWL (min 200 ns at 1.8V) |
| SI | Serial Data Input | Command/address/data input; sampled on SCK rising edge in SPI Mode 0 |
| SO | Serial Data Output | Data output; tri-stated when CS is high or during HOLD; valid within tV (max 200 ns at 1.8V) |
| WP | Write Protect | Hardware lock for status register; active low only when WPEN=1; prevents accidental writes during power transitions |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer when pulled low while SCK is low; resumes on rising edge with SCK low |
| GND | Ground Reference | Return path for VCC and all I/O; requires low-impedance connection to minimize noise coupling into SO/SI |
| VCC | Power Supply | 1.8V–5.5V input; bypass capacitor (0.1 µF ceramic) required near pin for stable 2 MHz operation |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Compatibility | Supports both clock polarity/phase configurations, enabling interoperability with diverse MCU SPI peripherals without firmware modification |
| 128-Byte Page Write Only | Enforces efficient bulk writes but prohibits single-byte updates - reduces write time per page vs. byte-by-byte programming |
| Three-Tier Block Protection | Allows selective locking of top 1/4, top 1/2, or full memory array via status register, securing boot code while leaving user data writable |
| HOLD Pin Functionality | Enables deterministic pause/resume of SPI transfers without re-synchronizing CS or losing address pointer state |
| Nonvolatile Status Register | BP0/BP1/WPEN bits retain protection settings across power cycles, eliminating need for initialization code on every boot |
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 operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via SPI during startup and runtime updates; HOLD used during interrupt-driven I/O servicing. Use Value: 100K endurance and >40-year retention ensure reliable operation over 10+ year product lifecycles without field recalibration. | Use Scenario: Holding sensor offset/gain coefficients and patient-specific therapy profiles in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure configuration memory with WP pin tied low and WPEN=1 to prevent corruption during ESD events or brown-out conditions. Use Value: 1.8V operation enables direct integration with ultra-low-power ARM Cortex-M0+ MCUs, reducing system BOM count. |
| Automotive Body Control Module | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Storing seat/mirror position presets, lighting profiles, and fault logs in 12V automotive systems with local 3.3V/1.8V regulation. IC Role / Device Role / Timing Role: SPI EEPROM interfaced to ASIL-B compliant microcontroller; block protection isolates critical safety configuration from user-modifiable settings. Use Value: −40°C to +85°C rating and 2.7V–5.5V dual-voltage support accommodate cold-cranking and load-dump transients without data loss. | Use Scenario: Storing firmware delta patches and tariff tables in utility-grade electricity meters deployed in outdoor enclosures. IC Role / Device Role / Timing Role: Field-upgradable memory accessed during scheduled maintenance windows; RDSR polling confirms write completion before power-down. Use Value: 128-byte page writes minimize update time and flash wear on host MCU, extending meter service life beyond 20 years. |
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; 1.8V–5.5V, 20 MHz max (5V), 8-lead SOIC package (not PDIP) | Higher speed at 5V but lacks HOLD pin; uses different status register layout and protection scheme | Select if board layout supports SOIC and higher clock rates are needed; verify HOLD functionality is not required in design |
| BR25H256FJ-WE2 | Rohm 256 Kbit SPI EEPROM; 1.6V–5.5V, 10 MHz max (3.3V), 8-lead SOP-J8 package; built-in error correction | Includes ECC for enhanced reliability; different pinout (SO/SI shared on pin 5), no dedicated HOLD pin | Choose for mission-critical applications where single-bit error immunity is mandatory; confirm SPI timing compatibility with host MCU |
Compared with M95256-WMN6TP and BR25H256FJ-WE2, the AT25HP256-10PI-1.8 provides unique HOLD functionality and PDIP packaging for legacy prototyping or through-hole production, while maintaining identical 1.8V–5.5V operation and 128-byte page write behavior.
Availability
AT25HP256-10PI-1.8 is available at Aetrix Electronics and suitable for industrial PLCs, medical device calibration storage, automotive body control modules, and smart energy meter firmware patch storage requiring stable component supply across extended product lifecycles.
Supply support for AT25HP256-10PI-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
Atmel Corporation, now part of Microchip Technology, is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and security ICs for industrial, automotive, and consumer applications.
The AT25HP256 series belongs to Atmel's high-reliability SPI EEPROM product line, designed specifically for low-voltage embedded systems needing robust, pin-compatible serial memory with flexible write protection and long data retention.
FAQ
What is the maximum clock frequency supported by AT25HP256-10PI-1.8 at 1.8V?
The AT25HP256-10PI-1.8 supports a maximum SCK clock frequency of 2 MHz when operated at 1.8V. This value is specified in the AC Characteristics table under fSCK for the 1.8–5.5V voltage range. Exceeding this limit may result in unreliable command execution or data corruption, especially under worst-case temperature and voltage conditions. Always observe tWH/tWL timing requirements (min 200 ns each at 1.8V) in PCB layout and firmware timing loops.
Does AT25HP256-10PI-1.8 support single-byte write operations?
No, the AT25HP256-10PI-1.8 supports only 128-byte page write operations - it does not support single-byte or partial-page writes. Attempting to write fewer than 128 bytes within a page leaves the remaining bytes in that page undefined. The device will automatically increment the internal address counter during a page write, and the address rolls over upon reaching the end of the page. Full-page alignment and 128-byte burst transfers are required for guaranteed data integrity in AT25HP256-10PI-1.8.
How does the HOLD pin function in AT25HP256-10PI-1.8 during an active SPI transaction?
In AT25HP256-10PI-1.8, the HOLD pin suspends serial communication when pulled low while SCK is low, preserving the current address pointer and internal state without resetting the sequence. Communication resumes when HOLD returns high while SCK remains low. During HOLD, SI inputs are ignored and SO enters high-impedance state. This allows external controllers to temporarily halt EEPROM access - for example, during high-priority interrupt handling - without losing synchronization or requiring retransmission of op-codes or addresses in the AT25HP256-10PI-1.8.
What protection levels are available via the Block Write Protection feature of AT25HP256-10PI-1.8?
The AT25HP256-10PI-1.8 offers four block write protection levels controlled by BP1/BP0 bits: none (00), top 1/4 (0x6000–0x7FFF, BP1=0/BP0=1), top 1/2 (0x4000–0x7FFF, BP1=1/BP0=0), or full array (0x0000–0x7FFF, BP1=1/BP0=1). These settings are stored nonvolatily in the status register and persist across power cycles. Protection applies only to write operations; reads remain fully accessible regardless of BP bit configuration in the AT25HP256-10PI-1.8.
Is the AT25HP256-10PI-1.8 compatible with SPI Mode 1 or Mode 2?
No, the AT25HP256-10PI-1.8 explicitly supports only SPI Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), as stated in its Features section. It does not support Mode 1 (CPOL=0, CPHA=1) or Mode 2 (CPOL=1, CPHA=0). Attempting to use unsupported modes will result in incorrect data sampling or command interpretation. Host MCU SPI peripheral must be configured for Mode 0 or Mode 3 to ensure correct timing of SI sampling (SCK edge) and SO output (SCK edge) in the AT25HP256-10PI-1.8.
AT25HP256-10PI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25HP256-10PI-1.8 FAQ
1.How can I place an order for AT25HP256-10PI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25HP256-10PI-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 AT25HP256-10PI-1.8 reliable?
The price and inventory of AT25HP256-10PI-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 AT25HP256-10PI-1.8 is usually 5 days.
3.What payment methods are accepted for AT25HP256-10PI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25HP256-10PI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25HP256-10PI-1.8?
AT25HP256-10PI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25HP256-10PI-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 AT25HP256-10PI-1.8?
For technical support, including AT25HP256-10PI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25HP256-10PI-1.8 requirements.
6.How does Aetrix verify that AT25HP256-10PI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25HP256-10PI-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 AT25HP256-10PI-1.8 meets industry standards.
7.What is the process for return or replacement of AT25HP256-10PI-1.8?
All AT25HP256-10PI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25HP256-10PI-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 AT25HP256-10PI-1.8 part is unused and in its original packaging.
Return procedure for AT25HP256-10PI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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