24LC256-E/ST16KVAO

Memory IC Overview

The Microchip Technology 24LC256-E/ST16KVAO is a 32K x 8 (256-Kbit) Serial Electrically Erasable PROM (EEPROM). It operates on a single supply voltage ranging from 2.5V to 5.5V and features a two-wire I2C compatible serial interface with a maximum clock frequency of 400 kHz. The device utilizes low-power CMOS technology, offering a standby current of 1 µA maximum at industrial temperature. It supports page write operations with a 64-byte buffer and includes hardware write-protect capabilities via the WP pin.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using configurable chip address inputs.
• Features Schmitt trigger inputs for enhanced noise suppression and output slope control to eliminate ground bounce.
• Includes hardware write-protect functionality that inhibits write operations when the WP pin is tied high.

Memory IC Applications

• Personal communications systems requiring non-volatile data storage
• Data acquisition applications needing reliable memory retention
• Industrial control systems utilizing I2C communication protocols

Memory IC Procurement Notes

Verify the specific suffix '16KVAO' against official Microchip documentation to confirm it denotes an automotive-grade AEC-Q100 qualified variant or specific packaging configuration. Ensure the extended temperature range (-40°C to +125°C) matches your system requirements. Confirm RoHS compliance status for environmental regulations.

Memory IC Selection Notes

Select this component for designs requiring 256-Kbit capacity with I2C interface compatibility. The 2.5V minimum operating voltage suits mid-range logic systems. Consider the 8-TSSOP package for surface-mount assembly constraints. Verify that the 400 kHz clock speed meets the system's data throughput needs compared to faster 1 MHz alternatives.

Memory IC Part Context

This part belongs to the 24XX256 family, which includes the 24AA256 and 24FC256 variants. While functionally similar, the 24LC256 is distinguished by its 2.5V minimum operating voltage, whereas other family members may support lower voltages or higher clock speeds. The 'E' indicates an extended temperature range capability.

Memory IC Replacement Considerations

Direct substitutes within the same family include the 24LC256-I/ST for industrial temperature ranges. For automotive applications, verify if the 24LC256T-I/SN16KVAO or similar AEC-Q100 qualified parts are appropriate replacements based on package and temperature specifications.

Memory IC FAQ

How does the hardware write-protect feature function?

The WP pin allows users to write-protect the entire array. When tied to VCC, write operations are inhibited, but read operations remain unaffected. When tied to VSS, write protection is disabled.

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

Up to eight 24LC256 devices can be connected to the same bus by configuring the A0, A1, and A2 chip select pins differently, expanding the address space up to 2 Mbit.