25LC020AT-E/MS

Overview

The Microchip Technology 25LC020AT-E/MS is a 2 Kbit (256 x 8-bit) 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. Key electrical parameters include a maximum write current of 5 mA at 5.5 V, standby current of 5 µA, and data retention exceeding 200 years. It offers 1,000,000 erase/write cycle endurance and includes hardware write protection. The component is housed in an 8-lead MSOP package and is rated for an extended temperature range of -40°C to +125°C.

Feature Summary

• Supports sequential read operations and page write mode allowing up to 16 bytes per cycle.
• Includes built-in power-on/off data protection circuitry and a write enable latch mechanism.
• Features a HOLD pin that allows suspension of serial communication without resetting the sequence.

Applications

• Storage of device unique identification numbers and production batch codes.
• Retention of calibration parameters and user configuration settings.
• Logging of operational status or fault records in embedded systems.

Procurement Notes

Verify the specific suffix 'E' confirms the automotive-grade temperature rating (-40°C to +125°C) distinct from industrial grades. Confirm the 'T' suffix indicates tape-and-reel packaging if required by automated assembly lines. Ensure the MSOP package variant matches the target PCB footprint dimensions. Cross-reference the datasheet revision to confirm compatibility with existing firmware instruction sets.

Selection Notes

Select this part when a 2 Kbit capacity is sufficient for non-volatile data storage requiring high endurance. The 2.5 V minimum operating voltage makes it suitable for systems where lower voltage rails are available compared to older EEPROMs. The SPI interface simplifies microcontroller integration by reducing pin count requirements. Consider the extended temperature range if the application environment exceeds standard industrial limits.

Part Context

This component belongs to the 25XX020A family, which shares identical memory arrays and instruction sets. The primary distinction within this family lies in the operating voltage ranges; the 25LC series requires a minimum of 2.5 V, whereas the 25AA series supports voltages down to 1.8 V. Both series utilize the same physical pinouts and software protocols, ensuring functional interchangeability regarding data access methods.

Replacement Considerations

Public confirmed substitute part numbers: 25LC020A-I/MS, 25LC020AT-I/MS, 25LC020A-E/MS.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin suspends transmission to the device while in the middle of a serial sequence. When pulled low while SCK is low, the SI, SCK, and SO pins enter a high-impedance state, ignoring transitions until the HOLD pin is brought high again.

What is the behavior of the address counter during a page write operation?

If a page write operation attempts to cross a physical page boundary, the internal address counter rolls back to the first address of the current page. This causes the new data to overwrite existing data at the beginning of the page rather than proceeding to the next page.