25LC020AT-E/SN

Overview

The Microchip Technology 25LC020AT-E/SN is a 2 Kbit (256 x 8) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It operates via a SPI-compatible serial bus with a maximum clock frequency of 10 MHz. The device supports a supply voltage range of 2.5 V to 5.5 V and features low-power CMOS technology. It includes write page mode for up to 16 bytes, self-timed erase/write cycles, and block protection capabilities.

Feature Summary

• Supports sequential read operations and page write mode for efficient data handling.
• Includes hardware write protection via the WP pin and software-based block protection settings.
• Features power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.

Applications

• Storing device unique identification numbers and production batch codes
• Saving calibration parameters and user configuration settings
• Recording simple operational logs or fault records

Procurement Notes

Verify that the ordering suffix 'SN' corresponds to the 8-lead SOIC package and 'T' indicates tape and reel packaging. Confirm the temperature grade 'E' matches the required automotive operating range of -40°C to +125°C. Ensure the voltage specification aligns with the 2.5V minimum requirement for this specific variant.

Selection Notes

Select this component when an SPI interface is preferred over I2C for improved noise immunity in noisy environments. Choose the 25LC020AT-E/SN specifically for applications requiring the wider automotive temperature range (-40°C to +125°C) compared to the industrial grade. Ensure the system design accommodates the 2.5V minimum supply voltage constraint.

Part Context

This part belongs to the 25XX020A family of 2 Kbit SPI EEPROMs from Microchip Technology. It shares the same memory array and instruction set as the 25AA020A but differs in its supported voltage range and temperature grades. The 'E' suffix denotes the extended automotive temperature range, while 'I' denotes the industrial range.

Replacement Considerations

The 25LC020A-I/MS is a compatible alternative within the same family offering the industrial temperature range in an MSOP package. For direct pin-to-pin replacement with identical electrical characteristics, verify the temperature grade requirements match between the original E-grade part and any substitute I-grade parts.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin allows the host to pause serial communication without resetting the sequence. When pulled low while SCK is low, inputs are ignored and SO goes high-impedance. Communication resumes when HOLD is brought high while SCK is low.

What happens if a page write crosses a physical page boundary?

If a page write operation attempts to cross a physical page boundary, the data wraps around to the beginning of the current page, overwriting existing data instead of writing to the next page.