25AA02UIDT-I/SN

Memory IC Overview

The Microchip Technology 25AA02UIDT-I/SN is a 2 Kbit Serial Electrically Erasable Programmable Read-Only Memory (EEPROM) featuring a preprogrammed 32-bit unique serial number. It utilizes an SPI-compatible interface with a maximum clock frequency of 10 MHz and operates within a supply voltage range of 1.8V to 5.5V. The device offers 256 x 8-bit organization, write page mode for up to 16 bytes, and self-timed erase/write cycles with a maximum duration of 5 ms. It supports industrial temperature ranges from -40°C to +85°C and is housed in an 8-lead SOIC package.

Memory IC Feature Summary

• Preprogrammed 32-bit unique serial number stored in the upper quarter of the array
• SPI compatible serial bus interface with hold functionality for interrupt servicing
• Hardware and software write protection mechanisms including block protection and power-on data protection
• High reliability with one million erase/write cycle endurance and over 200 years data retention

Memory IC Applications

• Device identification and serialization in manufacturing
• Secure storage of configuration parameters requiring hardware-level write protection
• Integration with microcontrollers needing non-volatile memory with unique ID capabilities
• Systems requiring high-reliability data logging with extended data retention

Memory IC Procurement Notes

Verify that the ordering suffix 'SN' corresponds to the 8-lead SOIC package variant as specified in the datasheet. Confirm the 'I' suffix indicates the Industrial temperature range (-40°C to +85°C). Ensure the specific revision DS20005205A is referenced for accurate electrical characteristics and timing diagrams during design validation.

Memory IC Selection Notes

Select this component when a unique factory-programmed identifier is required alongside standard EEPROM functionality. The 25AA02UID provides a scalable solution where the 32-bit ID can be extended via software padding or additional read addresses. Consider the 10 MHz clock speed for high-throughput applications and verify that the 16-byte page write size aligns with system write patterns.

Memory IC Part Context

This part belongs to the 25AA02UID family of 2 Kbit SPI EEPROMs manufactured by Microchip Technology. It shares functional similarities with other UID-series devices but is distinguished by its specific 32-bit serial number implementation and 8-lead SOIC packaging. The device integrates manufacturer and device codes at fixed memory locations to facilitate automated identification processes.

Memory IC Replacement Considerations

Direct pin-to-pin replacements within the same package and interface type should be verified against the official Microchip Device Selection Table. Cross-model substitution requires confirmation of identical voltage ranges, temperature specifications, and memory organization to ensure functional compatibility without circuit redesign.

Memory IC FAQ

How is the unique serial number protected from accidental modification?

The 32-bit serial number is stored in the upper 1/4 of the array (addresses 0xFC to 0xFF) and is factory-programmed with Block Protection bits (BP1=0, BP0=1) enabled. This hardware setting prevents write operations to this specific memory segment unless the user explicitly clears these bits using the Write Status Register instruction.

What is the function of the HOLD pin?

The HOLD pin allows the host to pause serial communication without resetting the internal address pointer. When pulled low while the chip select is active, the device ignores transitions on SI, SCK, and SO pins. Communication resumes when the HOLD pin is brought high while SCK is low.