24LC16BT-E/ST

Memory IC Overview

The Microchip Technology 24LC16BT-E/ST is a 16-Kbit (2K x 8) serial electrically erasable PROM featuring an I²C-compatible two-wire interface. It operates within a supply voltage range of 2.5V to 5.5V and supports clock frequencies up to 400 kHz. The device utilizes low-power CMOS technology, with maximum active read current of 1 mA and standby current of 5 μA at extended temperatures. It includes a 16-byte page write buffer, hardware write protection via the WP pin, and Schmitt trigger inputs for noise suppression. The memory array is organized into eight blocks of 256 words each.

Memory IC Feature Summary

• Supports bidirectional data transfer using a standard two-wire serial bus protocol compatible with I²C modes.
• Includes a 16-byte page write buffer that allows multiple bytes to be written in a single operation before initiating the internal write cycle.
• Features hardware write protection controlled by the WP pin to inhibit write operations when tied to VCC.
• Incorporates Schmitt trigger inputs and filter circuits on SCL and SDA lines to suppress noise spikes.

Memory IC Applications

• Embedded systems requiring non-volatile data storage for configuration parameters
• Industrial control devices needing reliable memory under extended temperature conditions
• Consumer electronics utilizing low-voltage microcontrollers with I²C interfaces

Memory IC Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature rating (-40°C to +125°C) and the 'T' indicates tape-and-reel packaging. Confirm the 'ST' designation corresponds to the TSSOP-8 package type as required by your PCB layout. Ensure the design accounts for the 2.5V minimum operating voltage, which distinguishes this model from lower-voltage variants like the 24AA16 series.

Memory IC Selection Notes

Select this component when an application requires operation above 2.5V but benefits from the robustness of the 24LC16B series over the 24AA16. The extended temperature grade is suitable for harsh environments where industrial grades are insufficient. Consider the 16-byte page write capability for applications prioritizing write throughput over byte-by-byte granularity. Verify that the system's I²C pull-up resistors are appropriate for the 400 kHz clock frequency requirement.

Memory IC Part Context

This part belongs to the 24XX16 family of serial EEPROMs, which also includes the 24AA16 and 24FC16. While sharing the same memory architecture and interface, the 24LC16B variant is distinct due to its higher minimum operating voltage of 2.5V compared to the 1.7V support of the 24AA16 and 24FC16. It is designed for applications where power supply stability is guaranteed above 2.5V.

Memory IC Replacement Considerations

The 24LC16B-I/ST serves as the industrial temperature grade equivalent. Cross-reference with other 24LC16B variants in different packages such as SOIC or DFN if form factor changes are permissible. Note that the 24AA16 is not a direct drop-in replacement due to its lower voltage requirements and potential timing differences at voltages below 2.5V.

Memory IC FAQ

How does the block select mechanism work in the 24LC16B?

The 24LC16B organizes its 16-Kbit memory into eight independent blocks of 256 words. The master device uses the three Most Significant Bits (B2, B1, B0) of the slave address byte to select which specific block to access during read or write operations.

What happens if a page write crosses a physical page boundary?

If a page write command attempts to write across a physical page boundary, the data wraps around to the beginning of the current page. This overwrites previously stored data in that page instead of proceeding to the next page, so software must prevent writes that cross boundaries.

Can the A0, A1, and A2 pins be left unconnected?

Yes, the A0, A1, and A2 pins are not used by the 24XX16 devices. They may be left floating or tied to either VSS or VCC without affecting functionality.