24AA01T-I/ST

Memory IC Overview

The Microchip Technology 24AA01T-I/ST is a 1 Kbit (128 x 8) Serial Electrically Erasable PROM (EEPROM). It features a 2-wire I²C compatible serial interface with Schmitt trigger inputs for noise suppression. The device operates on a single supply voltage ranging from 1.7V to 5.5V, supporting clock frequencies up to 400 kHz at VCC ≥ 2.5V and 100 kHz at VCC < 2.5V. It includes an 8-byte page write buffer, hardware write-protect capability via the WP pin, and ESD protection exceeding 4,000V. The Industrial temperature grade (-40°C to +85°C) ensures reliable performance in demanding environments.

Memory IC Feature Summary

• Low-power CMOS technology enabling operation down to 1.7V with minimal active and standby currents.
• I²C compatible bidirectional 2-wire serial interface with Schmitt triggers for enhanced noise immunity.
• Hardware write-protect function that inhibits all write operations when the WP pin is tied to VCC.
• High reliability characterized by over one million erase/write cycles and data retention exceeding 200 years.

Memory IC Applications

• Data acquisition systems requiring non-volatile storage for sensor calibration values.
• Personal communication devices utilizing low-voltage power supplies.
• Industrial control applications needing robust noise suppression and wide operating temperature ranges.
• Automotive electronics requiring AEC-Q100 qualified components.

Memory IC Procurement Notes

Verify the specific suffix 'ST' corresponds to the 8-Lead SOIC package as defined in the official datasheet. Confirm the 'I' designation indicates the Industrial temperature range of -40°C to +85°C. Ensure the ordering code matches the exact voltage and speed requirements for your application, as the 24AA01 series supports specific frequency limits based on supply voltage levels.

Memory IC Selection Notes

Select this component for designs requiring small memory capacity with I²C connectivity. The 24AA01 variant supports operation down to 1.7V, making it suitable for battery-powered applications where the 24LC01B's 2.5V minimum might be restrictive. Consider the 8-byte page write buffer for efficient data handling. Verify that the host controller can manage the open-drain SDA line with appropriate pull-up resistors for the chosen clock speed.

Memory IC Part Context

This part belongs to the 24XX01 family of 1 Kbit Serial EEPROMs, which also includes the 24LC01B and 24FC01 variants. While sharing the same memory organization and interface protocol, these variants differ in minimum operating voltage and maximum clock frequency. The 24AA01 specifically offers the lowest voltage operation within the family, distinguishing it from the higher-voltage 24LC01B and high-speed 24FC01 models.

Memory IC Replacement Considerations

Direct substitutes within the same package and electrical specifications include other 24AA01 variants with different temperature grades or packaging options, such as 24AA01-E/ST for Extended temperature range. Cross-family replacements like 24LC01B are possible if the system voltage remains above 2.5V, but verify clock frequency limitations at lower voltages.

Memory IC FAQ

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

When the WP pin is connected to VCC, all write operations to the memory array are inhibited, protecting the data. Read operations remain unaffected. Connecting WP to VSS enables normal read/write access.

What is the maximum clock frequency for the 24AA01?

The maximum clock frequency is 400 kHz when the supply voltage (VCC) is between 2.5V and 5.5V. If VCC is below 2.5V, the maximum frequency is limited to 100 kHz.

Can the address pins A0, A1, and A2 be used for device addressing?

No, the A0, A1, and A2 pins are not internally connected for the 24XX01 device. They may be left floating or tied to either VSS or VCC without affecting device addressing.