34VL02/SN

Overview

The Microchip Technology 34VL02/SN is a 2 Kbit (256 x 8) serial EEPROM featuring a 2-wire I²C compatible interface. It operates on a single supply voltage ranging from 1.5V to 3.6V, with a maximum clock frequency of 400 kHz for VCC ≥ 1.8V and 100 kHz for VCC < 1.8V. The device includes permanent and resettable software write-protect features for the lower half of the array (addresses 00h-7Fh), alongside hardware write protection via the WP pin. It supports page writes up to 16 bytes, offers data retention exceeding 200 years, and endures over one million erase/write cycles.

Feature Summary

• Features dual software write-protect modes allowing selective locking of the lower memory half, complemented by an external hardware write-protect pin for full array security.
• Supports bidirectional 2-wire serial communication with Schmitt trigger inputs and output slope control to ensure noise immunity and eliminate ground bounce.
• Includes an internal address pointer enabling current, random, and sequential read operations across multiple cascaded devices.

Applications

• Low-voltage embedded systems requiring non-volatile data storage
• I²C bus networks with multiple slave devices
• Applications necessitating partial or full memory write protection

Procurement Notes

Verify the specific package suffix matches the required form factor, as the SN designation indicates SOIC-8 packaging. Confirm that the operating voltage environment remains within the 1.5V to 3.6V range to ensure compliance with the specified electrical characteristics. Ensure proper pull-up resistor values are selected for the SDA and SCL lines based on the target clock frequency.

Selection Notes

Select this component when a low-voltage EEPROM with flexible write-protection schemes is required. The 34VL02 is suitable for designs needing operation down to 1.5V. Consider the available package options if space constraints exist, noting that the SN variant specifically provides surface-mount SOIC-8 packaging. Verify compatibility with the system's I²C bus speed requirements.

Part Context

The 34VL02 belongs to Microchip's 34VLxx series of 2 Kbit serial EEPROMs. This family is characterized by low-power CMOS technology and broad voltage compatibility. The device integrates high-voltage detection circuits to prevent erroneous writes during power-down conditions, ensuring data integrity in varying supply environments.

Replacement Considerations

Consult official Microchip documentation for verified cross-references. Generic equivalents may lack the specific permanent software write-protect functionality or the exact voltage operating range defined for the 34VL02.

FAQ

How does the permanent software write-protect feature function?

The Permanent Software Write-Protect (PSWP) command locks the lower half of the array (addresses 00h-7Fh). Once enabled, this protection cannot be reversed by any instruction, power cycling, or the state of the WP pin.

What is the behavior of the device during an internal write cycle?

During an internally timed write cycle, the 34VL02 does not generate Acknowledge signals. This allows masters to perform Acknowledge polling to determine when the device is ready for the next command.