AT25256AW-10SI-1.8

Memory IC Overview

The AT25256AW-10SI-1.8 is a serial electrically-erasable programmable read-only memory (EEPROM) with a capacity of 256 kbit, organized as 32,768 words of 8 bits each. It operates within a supply voltage range of 1.8V to 5.5V and supports SPI clock frequencies up to 5 MHz at this voltage level. The device utilizes an 8-lead JEDEC SOIC package and functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Supports SPI Modes 0 (0,0) and 3 (1,1) for synchronous data transfer
• Provides hardware write protection via the WP pin and software block protection
• Includes a HOLD pin to suspend serial communication without resetting the sequence
• Features self-timed write cycles that eliminate the need for separate erase operations

Memory IC Applications

• Industrial control systems requiring low-power non-volatile storage
• Commercial applications necessitating compact serial memory solutions
• Data logging in environments with restricted power supply voltages

Memory IC Procurement Notes

Verify the specific ordering suffix against official Microchip or Atmel documentation to confirm the exact voltage variant and package type. Ensure compatibility with system voltage levels and interface requirements before integration. Confirm availability through authorized distributors as manufacturing status may change.

Memory IC Selection Notes

Select this component when a 256 kbit EEPROM is required with a wide operating voltage range starting from 1.8V. The 8-lead SOIC package suits space-constrained designs. Verify that the system supports SPI Mode 0 or 3 and requires hardware write protection capabilities for data integrity.

Memory IC Part Context

This part belongs to the AT25128A/256A family of SPI Serial EEPROMs originally manufactured by Atmel Corporation, now under Microchip Technology. The family offers various density options and package types, optimized for industrial and commercial applications where low power consumption and flexible voltage operation are critical design parameters.

Memory IC Replacement Considerations

Consult official datasheets for cross-reference candidates such as other AT25256 variants with different suffixes or comparable SPI EEPROMs from other manufacturers. Verify electrical characteristics, pinout compatibility, and command set alignment before substitution.

Memory IC FAQ

How does the HOLD pin function during serial communication?

The HOLD pin allows the suspension of any serial communication without resetting the serial sequence. To pause, the HOLD pin must be brought low while the SCK pin is low. Communication resumes when the HOLD pin is brought high while SCK is low.

What is the maximum clock frequency for the 1.8V version?

For the 1.8V to 5.5V operating range, the maximum SCK clock frequency is specified as 5 MHz.