34LC02T-E/ST

Overview

The Microchip Technology 34LC02T-E/ST is a 2 Kbit (256 x 8) Electrically Erasable PROM featuring a 2-wire serial I²C interface. It operates on a single supply voltage ranging from 1.7V to 5.5V, with a maximum clock frequency of 1 MHz for the LC version. The device supports page writes up to 16 bytes and includes permanent and resettable software write-protect features for the lower half of the array, alongside hardware protection via the WP pin. It offers high endurance exceeding one million erase/write cycles and data retention greater than 200 years.

Feature Summary

• Features permanent and resettable software write-protect capabilities for the lower half of the memory array, complemented by an external hardware write-protect pin for full array protection.
• Supports bidirectional 2-wire serial communication compatible with standard I²C protocols, allowing cascading of up to eight devices on the same bus.
• Incorporates Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce during operation.

Applications

• Low-voltage embedded systems requiring non-volatile data storage
• Industrial control applications needing robust noise immunity
• Automotive electronics operating across extended temperature ranges

Procurement Notes

Verify that the ordering suffix 'T' corresponds to tape-and-reel packaging and '/ST' indicates the TSSOP package type as specified in the datasheet. Confirm the 'E' suffix denotes the Automotive temperature range (-40°C to +125°C). Ensure compatibility with the required I²C clock speed and voltage levels before procurement.

Selection Notes

Select this component when a 1 MHz I²C clock speed is required, distinguishing it from the slower 34AA02 variant. Choose the TSSOP package for surface-mount assembly needs. Consider the automotive grade if operation above 85°C is necessary, or the industrial grade if cost optimization at lower temperatures is preferred.

Part Context

This part belongs to the 34XX02 family of 2 Kbit serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 34AA02 but offers higher clock speeds suitable for faster data transfer requirements. The device is designed for applications demanding low power consumption and flexible write-protection schemes.

Replacement Considerations

The 34AA02 series serves as a direct functional alternative with identical pinouts and memory organization, though it operates at lower maximum clock frequencies. Verify that the replacement part meets the specific voltage and temperature requirements of the design.

FAQ

How does the software write-protect feature function?

The device allows protection of the lower half of the array (addresses 00h-7Fh) through either a resettable command (SWP) or a permanent command (PSWP), which cannot be reversed once enabled.

What is the maximum number of devices that can be connected to the bus?

Up to eight 34LC02 devices can be cascaded on the same I²C bus using the A0, A1, and A2 chip select pins to differentiate addresses.