24AA32A-I/SM

Memory IC Overview

The Microchip Technology 24AA32A-I/SM is a 32-Kbit Electrically Erasable PROM (EEPROM) organized as a single block of 4K x 8-bit memory. It features a two-wire serial interface compatible with I2C™ standards, supporting clock frequencies up to 400 kHz for VCC ≥ 2.5V and 100 kHz for VCC < 2.5V. The device operates on a single supply voltage ranging from 1.7V to 5.5V. Key electrical characteristics include a typical standby current of 1 µA and an active read current of 400 µA at 5.5V. It supports page write operations with a 32-byte buffer and a maximum write cycle time of 5 ms.

Memory IC Feature Summary

• Low-voltage CMOS technology enabling operation down to 1.7V with minimal power consumption.
• I2C-compatible two-wire serial interface with Schmitt trigger inputs for noise suppression.
• Hardware write-protect capability via the WP pin to inhibit array writes when tied high.
• High reliability specifications including over one million erase/write cycles and data retention exceeding 200 years.

Memory IC Applications

• Personal communications devices requiring low-power non-volatile storage.
• Data acquisition systems needing reliable parameter storage.
• Industrial control applications utilizing I2C bus architectures.
• Embedded systems requiring hardware-level write protection for critical data.

Memory IC Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C) and 'SM' denotes the 8-lead SOIJ package. Confirm that the specific revision matches the datasheet DS20001713P. Ensure compatibility with the system's I2C pull-up resistor requirements and voltage levels, noting the frequency limitation below 2.5V. Check for RoHS compliance status if required by assembly specifications.

Memory IC Selection Notes

Select this component for applications requiring a 32-Kbit EEPROM with I2C connectivity and industrial temperature stability. It is suitable where low standby current is critical. Note that the 24LC32A variant requires a minimum 2.5V supply, whereas this 24AA32A part supports operation down to 1.7V. Ensure the design accommodates the 32-byte page write boundary constraints to prevent data overwrite errors during multi-byte writes.

Memory IC Part Context

This device belongs to the 24XX32A family of serial EEPROMs manufactured by Microchip Technology. The family includes variants like the 24LC32A, which differs primarily in minimum operating voltage. The 24AA32A is designed for advanced low-power applications and is available in multiple surface-mount packages including MSOP, SOIC, TSSOP, and DFN, alongside through-hole options.

Memory IC Replacement Considerations

The 24LC32A is a functional substitute within the same family but requires a minimum supply voltage of 2.5V compared to the 1.7V minimum of the 24AA32A. Other 32-Kbit I2C EEPROMs from different manufacturers may require verification of pinout compatibility, voltage thresholds, and I2C timing parameters before substitution.

Memory IC FAQ

How does the WP pin function?

The Write-Protect (WP) pin inhibits write operations when tied to VCC. When tied to VSS, write operations are enabled. The pin state is sampled at the Stop bit of every write command.

What is the maximum page write size?

The device supports a page write capability of up to 32 bytes. If a write attempt crosses a physical page boundary, the data wraps around to the beginning of the current page.

Can multiple devices share the same I2C bus?

Yes, up to eight 24AA32A devices can be connected to the same bus using the A0, A1, and A2 chip select pins to differentiate addresses, allowing for an address space expansion up to 256 Kbits.