AT25256-10PI

Memory IC Overview

The AT25256-10PI is a serial electrically-erasable programmable read-only memory (EEPROM) with a capacity of 262,144 bits organized as 32,768 words of 8 bits each. It operates via a Serial Peripheral Interface (SPI) compatible bus supporting Modes 0 and 3. The device supports standard voltage operation from 4.5V to 5.5V with a maximum clock frequency of 3 MHz. It features self-timed write cycles typically lasting 5 ms, block write protection for the top quarter, half, or entire array, and hardware data protection via a dedicated Write Protect pin.

Memory IC Feature Summary

• Supports SPI Modes 0 and 3 with separate input and output pins
• Provides hardware and software data protection mechanisms
• Enables selective block write protection for specific memory segments
• Includes a HOLD pin to suspend serial communication without resetting the sequence

Memory IC Applications

• Industrial control systems requiring non-volatile data storage
• Commercial applications necessitating low-power operation
• Microcontroller-based systems utilizing synchronous serial interfaces

Memory IC Procurement Notes

Verify that the ordering suffix matches the required package type and operating temperature range. Confirm the voltage option corresponds to the system power supply requirements. Ensure the component source is authorized to guarantee authenticity and traceability. Check for any specific automotive or extended temperature variants if environmental conditions exceed standard industrial limits.

Memory IC Selection Notes

Select this component when a 256-kbit EEPROM with SPI interface is required. Choose the -10 suffix for standard commercial/industrial voltage ranges. Consider alternative packages such as SOIC or TSSOP if surface mount technology is preferred over through-hole mounting. Verify that the 3 MHz clock speed meets the system timing constraints.

Memory IC Part Context

This part belongs to the AT25128/256 family of serial EEPROMs manufactured by Atmel Corporation. The family shares identical functional characteristics and instruction sets, differing primarily in memory density. The AT25256 variant provides double the storage capacity of the AT25128 while maintaining the same pinout and operational parameters.

Memory IC Replacement Considerations

AT25256-10PC

Memory IC FAQ

How is the write protect function implemented?

Write protection is achieved through both hardware and software methods. The WP pin inhibits writes to the status register when held low, while block protection bits allow locking specific memory segments.

What happens if an invalid op-code is received?

If an invalid op-code is received, the device ignores subsequent data inputs, and the serial output pin remains in a high impedance state until the Chip Select pin is deasserted.