34AA02T-E/ST

Overview

The Microchip Technology 34AA02T-E/ST is a 2 Kbit (256 x 8) serial EEPROM featuring an I²C-compatible 2-wire interface. It operates on a single supply voltage ranging from 1.7V to 5.5V and supports clock frequencies up to 400 kHz, with 100 kHz compatibility at voltages below 1.8V. The device utilizes TSSOP-8 surface-mount packaging and is rated for the Automotive temperature range of -40°C to +125°C. Key electrical characteristics include a typical standby current of 1 µA, read current of 0.05 mA, and a page write time of 3 ms.

Feature Summary

• Features permanent and resettable software write-protection for the lower half of the memory array alongside hardware protection via the WP pin.
• Incorporates Schmitt trigger inputs and output slope control to suppress noise spikes and eliminate ground bounce during operation.
• Supports cascading of up to eight devices on the same bus using chip select pins A0, A1, and A2.

Applications

• Automotive electronic systems requiring data retention across extended temperature ranges.
• Industrial equipment utilizing low-voltage microcontrollers.
• Consumer electronics needing non-volatile storage for configuration parameters.

Procurement Notes

Verify that the ordering suffix 'E' corresponds to the Automotive temperature grade (-40°C to +125°C) rather than the Industrial grade. Confirm the package type matches the required TSSOP-8 footprint. Ensure the design accounts for the specific voltage thresholds required for software write-protection commands on the A0 pin.

Selection Notes

Select this component when automotive reliability and wide voltage operation are required. The 34AA02T-E/ST offers higher endurance compared to standard industrial versions. Consider the page write buffer size for throughput requirements. Verify that the system power supply remains above the brown-out detection threshold to ensure data integrity.

Part Context

This part belongs to the 34AA02/34LC02 family of 2 Kbit serial EEPROMs manufactured by Microchip Technology. The 'T' indicates tape and reel packaging, while 'E' denotes the extended automotive temperature rating. It shares functional similarities with the 34LC02 but differs in maximum clock frequency specifications based on supply voltage.

Replacement Considerations

Microchip 34AA02-I/ST

FAQ

How does the software write-protect mechanism function?

The device provides two software write-protect features: a resettable SWP command and a permanent PSWP command. Both protect the lower half of the array (addresses 00h-7Fh). Additionally, the WP pin can be used to protect the entire array.

What is the maximum clock frequency supported?

The device supports a maximum clock frequency of 400 kHz. However, if the supply voltage is below 1.8V, the maximum compatible clock frequency is limited to 100 kHz.