25AA020A-I/ST

Memory IC Overview

The Microchip Technology 25AA020A-I/ST is a 2 Kbit (256 x 8-bit) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It utilizes a standard SPI-compatible serial bus for communication, requiring SCK, SI, SO, and CS signals. The device operates within a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 10 MHz. It features self-timed erase and write cycles with a maximum duration of 5 ms. The component includes hardware write protection via the WP pin and software block protection settings.

Memory IC Feature Summary

• Supports page write mode allowing up to 16 bytes per cycle
• Includes built-in power-on/off data protection circuitry
• Features a dedicated HOLD input to pause serial communication without resetting the sequence
• Provides selectable block write protection for none, 1/4, 1/2, or all of the memory array

Memory IC Applications

• Storing device unique identification numbers
• Recording production batch numbers
• Saving minimal operational logs
• Retaining calibration parameters and user settings

Memory IC Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C) and 'ST' indicates the 8-lead TSSOP package. Confirm the 'AA' prefix specifies the 1.8V to 5.5V operating voltage range, distinct from the 2.5V minimum variant. Ensure compliance with RoHS standards if required by the design specification.

Memory IC Selection Notes

Select this component when an SPI interface is preferred over I2C for improved noise immunity in specific environments. Choose the 25AA020A specifically for applications requiring operation down to 1.8V, as opposed to the 25LC020A which requires a minimum of 2.5V. Consider the TSSOP package for surface mount assembly requirements.

Memory IC Part Context

This part belongs to the 25XX020A family of 2 Kbit SPI EEPROMs manufactured by Microchip Technology. It shares identical memory arrays and instruction sets with the 25LC020A, differing primarily in the supported supply voltage range. The family is designed for low-power, non-volatile storage needs in microcontroller-based systems.

Memory IC Replacement Considerations

The 25LC020A serves as a functional substitute within the same package and pinout configuration. Note that the 25LC020A has a higher minimum operating voltage of 2.5V compared to the 1.8V minimum of the 25AA020A.