34VL02T/ST

Overview

The Microchip Technology 34VL02T/ST is a 2 Kbit (256 x 8) Electrically Erasable PROM featuring a 2-Wire I²C compatible serial interface. It operates on a single supply voltage ranging from 1.5V to 3.6V, with a maximum clock frequency of 400 kHz (100 kHz for VCC < 1.8V). The device utilizes low-power CMOS technology, drawing typical read currents of 1 mA and standby currents of 100 nA. It includes a 16-byte page write buffer and supports up to eight cascaded devices via chip select pins.

Feature Summary

• Features permanent and resettable software write-protect capabilities for the lower half of the memory array alongside hardware protection for the entire array.
• Supports bidirectional data transfer over a standard 2-wire serial bus with Schmitt trigger inputs for enhanced noise suppression.
• Includes output slope control mechanisms designed to eliminate ground bounce during operation.

Applications

• Low-voltage embedded systems requiring non-volatile data storage
• I²C bus expansion using multiple cascaded EEPROM units
• Applications necessitating specific sector-level write protection

Procurement Notes

Verify that the ordering suffix 'T' corresponds to the TSSOP-8 package type as specified in the datasheet. Confirm the temperature grade matches the required operational range of -20°C to +85°C. Ensure compatibility with the 1.5V to 3.6V supply voltage constraints. Check RoHS compliance status if required by manufacturing standards. Validate pin configurations against the specific TSSOP footprint requirements.

Selection Notes

Select this component when a 2 Kbit capacity is sufficient for system requirements. Choose this part for designs operating within the 1.5V to 3.6V voltage range. Consider this device if I²C interface compatibility is mandatory. Evaluate the need for dual software write-protection features for the lower memory half. Assess whether the TSSOP-8 surface mount package fits the board layout constraints.

Part Context

The 34VL02 belongs to the 34VL series of 2 Kbit serial EEPROMs manufactured by Microchip Technology. This series is characterized by its low-voltage operation and robust write-protection schemes. The device integrates high-voltage detection circuits to ensure reliable programming cycles across the specified voltage range.

Replacement Considerations

Consult the manufacturer's documentation for direct cross-reference part numbers. Verify electrical specifications and pinout compatibility before substituting. Ensure any alternative device supports the same I²C protocol and voltage levels.

FAQ

How does the Permanent Software Write-Protect (PSWP) feature function?

The PSWP command permanently locks the first 128 bytes (addresses 00h-7Fh) of the array. Once enabled, this protection cannot be reversed through any instruction, power cycling, or the state of the WP pin.

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

The A0 pin serves a dual purpose: it acts as a chip select address input and detects the high voltage (VHV) required to execute software write-protect commands like SWP and CSWP.

Can sequential reads span across multiple connected devices?

No, sequential reads cannot cross device boundaries. While up to eight devices can be cascaded to expand address space, each device must be addressed individually for continuous reading operations.