24AA08HT-I/OT

Memory IC Overview

The Microchip Technology 24AA08HT-I/OT is an 8 Kbit Electrically Erasable PROM organized as four blocks of 256 x 8-bit memory. It features a 2-wire serial interface compatible with I2C™, supporting clock frequencies up to 400 kHz at VCC levels between 2.5V and 5.5V, or 100 kHz when VCC is below 2.5V. The device operates on a single supply ranging from 1.7V to 5.5V, with maximum active read current of 1 mA and standby current of 1 µA. It includes hardware write-protect for the upper half-array (addresses 200h-3FFh) via the WP pin, utilizes a 16-byte page write buffer, and guarantees data retention exceeding 200 years.

Memory IC Feature Summary

• Supports bidirectional 2-wire serial communication with Schmitt trigger inputs for noise suppression
• Includes hardware write-protect capability that inhibits writes to the upper half of the memory array
• Features output slope control designed to eliminate ground bounce during operation
• Provides acknowledge polling functionality to maximize bus throughput during internal write cycles

Memory IC Applications

• Data logging in industrial monitoring systems
• Configuration storage for embedded controllers
• Parameter retention in low-power consumer electronics
• Calibration data storage in automotive sensors

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature range (-40°C to +85°C) and 'OT' denotes the SOT-23-5 package. Confirm the 'H' variant designation ensures compatibility with the lower voltage operating range down to 1.7V. Ensure the ordering documentation matches the exact part number to avoid confusion with the 24LC08BH series which requires a minimum 2.5V supply.

Memory IC Selection Notes

Select this component when a compact surface-mount solution is required for non-volatile storage in space-constrained designs. The SOT-23-5 package offers a small footprint suitable for portable devices. Choose this part over standard variants if the application demands operation at supply voltages as low as 1.7V, ensuring reliable performance across the full specified voltage range without requiring level shifting.

Memory IC Part Context

This device belongs to the 24XX08H family of serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with other members like the 24AA04H and 24AA16H but provides an 8 Kbit capacity. The 'H' designation distinguishes it from the 24LC08BH series, primarily regarding the minimum operating voltage threshold. It is designed for applications requiring robust data retention and low power consumption in standard digital environments.

Memory IC Replacement Considerations

The 24LC08BHT-I/OT serves as a functional substitute within the same package, provided the system supply voltage remains above 2.5V. Verify that the replacement meets the specific voltage requirements of the target circuit, as the 24LC08BH does not support operation below 2.5V unlike the 24AA08H series.

Memory IC FAQ

How does the Write-Protect (WP) pin function?

Connecting the WP pin to VCC inhibits write operations to the upper half of the memory array (addresses 200h-3FFh), while connecting it to VSS enables normal read/write access to the entire memory.

What is the purpose of Acknowledge Polling?

Acknowledge Polling allows the master device to determine when an internal write cycle is complete by repeatedly sending a write command until the slave device returns an acknowledge signal, thereby maximizing bus throughput.