34VL02T/MNY

Overview

The Microchip Technology 34VL02T/MNY is a 2 Kbit (256 x 8) Electrically Erasable PROM featuring a 2-wire I²C serial interface. It operates on a single supply voltage ranging from 1.5V to 3.6V, with a maximum clock frequency of 400 kHz at VCC ≥ 1.8V and 100 kHz below that threshold. The device utilizes low-power CMOS technology, drawing typical standby current of 100 nA and active read current of 1 mA. It includes a 16-byte page write buffer, supports up to eight cascaded devices via chip select pins, and offers hardware write protection for the entire array or software-based permanent and resettable protection for the lower half.

Feature Summary

• Features dual software write-protect mechanisms allowing either permanent or resettable locking of the lower memory half, alongside an external pin for complete array hardware protection.
• Supports bidirectional data transfer over a standard 2-wire I²C bus compatible with both 100 kHz and 400 kHz clock frequencies.
• Incorporates Schmitt trigger inputs and output slope control to suppress noise spikes and eliminate ground bounce during operation.

Applications

• Low-voltage embedded systems requiring non-volatile data storage
• Industrial control applications needing robust noise immunity
• Battery-powered devices utilizing power-saving standby modes

Procurement Notes

Verify the specific suffix 'MNY' corresponds to the 8-lead TDFN package configuration required for your PCB layout. Confirm the temperature grade matches your operational environment specifications. Ensure the design accounts for the 1.5V minimum operating voltage if powering from low-voltage sources. Cross-reference the datasheet revision to confirm compatibility with existing firmware protocols.

Selection Notes

Select this component when a small footprint is required due to its TDFN packaging option compared to larger DIP or SOIC variants. Choose this part for designs strictly limited to a 3.6V maximum supply rail, as it does not support higher voltages found in other EEPROM series. Consider the internal address pointer functionality if sequential reading across multiple bytes is necessary for system efficiency.

Part Context

This device belongs to the 34VLxx family of serial EEPROMs designed for low-voltage applications. It shares architectural similarities with the 24LC and 24AA series but is distinct in its specific 1.5V to 3.6V operating range and unique software write-protection command set. The 'VL' designation indicates the low-voltage capability and specific electrical characteristics defined in the DS22079A datasheet.

Replacement Considerations

Direct substitutes include other 2Kb I²C EEPROMs from the same manufacturer family, such as the 24LC02 or 24AA02, provided they meet the specific voltage and package constraints. Verify pinout compatibility and timing parameters before swapping to ensure signal integrity.

FAQ

How is the permanent software write-protect feature disabled?

The Permanent Software Write-Protect (PSWP) feature cannot be disabled once enabled. It permanently locks the lower half of the array regardless of instructions, power cycling, or the state of the WP pin.

What is the function of the A0 pin regarding write protection?

The A0 pin serves as a chip select input and is also used to detect high voltage (VHV) levels required to execute specific software write-protect commands like SWP and CSWP.