34LC02T-I/ST

Overview

The Microchip Technology 34LC02T-I/ST is a 2 Kbit (256 x 8) Electrically Erasable PROM featuring a 2-Wire Serial Interface Bus compatible with I²C™. It operates on a single supply ranging from 1.7V to 5.5V, supporting a maximum clock frequency of 1 MHz for the LC version. The device includes permanent and resettable software write-protect capabilities for the lower half of the array (addresses 00h-7Fh), alongside hardware write protection via the WP pin. It utilizes low-power CMOS technology with typical standby current of 100 nA and read current of 1 mA.

Feature Summary

• Features permanent and resettable software write-protect mechanisms for the lower half of the memory array.
• Supports bidirectional data transfer over a 2-wire serial interface bus compatible with I²C™ protocols.
• Includes Schmitt trigger inputs and output slope control to suppress noise and eliminate ground bounce.
• Provides hardware write protection for the entire array through an external Write-Protect pin.

Applications

• Data storage in systems requiring non-volatile memory retention across power cycles.
• Configuration storage for microcontrollers and embedded processors.
• Parameter logging in industrial monitoring equipment.

Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C). Confirm the 'T' suffix indicates tape-and-reel packaging suitable for automated surface-mount assembly. Ensure the specific voltage requirements of the target system align with the 1.7V to 5.5V operating range specified for the 34LC02 variant.

Selection Notes

Select this component when a 2 Kbit EEPROM with high-speed 1 MHz clock capability is required. It is suitable for designs needing flexible write-protection schemes, including partial array locking. Consider the TSSOP-8 package dimensions for PCB layout constraints. Verify compatibility with the host controller's I²C voltage levels and pull-up resistor requirements.

Part Context

This part belongs to the 34AA02/34LC02 family of 2 Kbit serial EEPROMs. The 34LC02 variant is distinguished by its support for higher clock frequencies up to 1 MHz compared to the 34AA02. Both variants share identical pinouts and functional features, differing primarily in electrical timing specifications and maximum operating speeds.

Replacement Considerations

The 34AA02T-I/ST serves as a direct functional substitute within the same package, though it supports a maximum clock frequency of 400 kHz. Other 2 Kbit I²C EEPROMs may require verification of voltage ranges, pinout compatibility, and write-protection logic before substitution.