AT24C1024B-PU25

Memory IC Overview

The AT24C1024B-PU25 is a 1,048,576-bit (131,072 x 8) serial electrically erasable and programmable read-only memory (EEPROM). It operates within a supply voltage range of 2.5V to 5.5V and supports I²C clock frequencies up to 1 MHz at these voltages. The device features a 256-byte page write mode, hardware and software data protection via the WP pin, and an industrial temperature range of –40°C to +85°C. It is housed in an 8-lead PDIP package.

Memory IC Feature Summary

• Supports bidirectional data transfer over a two-wire serial interface with Schmitt triggers for noise suppression.
• Incorporates a write protect pin that inhibits all write operations when connected high to VCC.
• Enables cascading of up to four devices on a common bus using hardwired address inputs A1 and A2.

Memory IC Applications

• Industrial and commercial applications requiring low-power and low-voltage operation.
• Storage of calibration parameters, device configuration, and running logs in embedded systems.
• Persistent storage for firmware version identifiers and user settings where data retention is critical.

Memory IC Procurement Notes

Verify the ordering suffix 'PU25' corresponds to the bulk form only variant in the 8-lead PDIP package. Confirm the specific voltage code matches the required operating range of 2.5V to 5.5V. Ensure the component meets the specified industrial temperature requirements for the target application environment.

Memory IC Selection Notes

Select this part when a large non-volatile memory capacity is needed alongside a standard I²C interface. The 2.5V voltage option provides compatibility with higher voltage logic levels while maintaining low standby current. Consider the page write capability for efficient data logging applications that require frequent updates.

Memory IC Part Context

This component belongs to the AT24Cxx family of serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with other members like the AT24C256 but offers significantly higher density. The device utilizes a self-timed write cycle mechanism typical of CMOS EEPROM technology.

Memory IC Replacement Considerations

Direct replacements include other AT24C1024B variants with different packages or voltage codes, such as AT24C1024B-PU for 1.8V operation. Cross-family equivalents may exist but require verification of pinout and electrical specifications.

Memory IC FAQ

How does the device handle writes that cross page boundaries?

When a page write sequence reaches the end of the 256-byte page, the internal address rolls over to the beginning of the same page. Subsequent bytes overwrite existing data within that page rather than advancing to the next page.

What is the function of the A1 and A2 pins?

The A1 and A2 pins serve as device address inputs that allow up to four devices to be addressed on a single I²C bus. They can be hardwired to VCC or GND to set unique addresses.