AT24CS32-MAHM-E

Memory IC Overview

The AT24CS32-MAHM-E is a 32-Kbit (4,096 x 8) I²C-compatible serial EEPROM featuring a unique, factory-programmed 128-bit serial number. It operates within a low-voltage range of 1.7V to 5.5V and supports Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast Mode Plus (1 MHz at 2.5V–5.5V). The device includes hardware write protection, Schmitt trigger inputs for noise suppression, and an industrial temperature range of -40°C to +85°C. It offers high reliability with 1,000,000 write cycles and 100-year data retention.

Memory IC Feature Summary

• Integrates a permanent, read-only 128-bit unique serial number programmed during manufacturing.
• Supports bidirectional data transfer via I²C interface with multiple speed modes.
• Provides full array hardware data protection through the Write-Protect pin.
• Features ultra-low active and standby current consumption for power-sensitive applications.

Memory IC Applications

• Industrial systems requiring component serialization
• Commercial devices needing low-power non-volatile storage
• Embedded controllers utilizing two-wire serial buses

Memory IC Procurement Notes

Verify the specific package suffix 'MAHM' against Microchip's official ordering guide to confirm the exact physical package type and tape/reel specifications. Ensure the voltage grade and temperature range match your system requirements. Confirm that the factory-programmed serial number feature is required for your application, as this distinguishes the CS series from standard EEPROMs.

Memory IC Selection Notes

Select this component when unique device identification is necessary alongside standard EEPROM functionality. It is suitable for designs requiring robust noise immunity due to integrated Schmitt triggers. Consider the available packages (SOIC, TSSOP, UDFN, SOT23) based on board space constraints. Ensure the host controller supports the desired I²C clock frequency and voltage levels.

Memory IC Part Context

This part belongs to the AT24CSxx family of I²C serial EEPROMs. The 'CS' designation indicates the inclusion of the unique 128-bit serial number feature. It shares the same electrical characteristics and interface protocols as other members of the series but provides distinct asset tracking capabilities. The memory organization remains consistent across the family for ease of migration.

Memory IC Replacement Considerations

Standard AT24C32 devices lack the unique serial number feature. If serialization is not required, generic AT24C32 parts may be compatible electrically. Verify pinout compatibility if substituting with other 32-Kbit I²C EEPROMs from different manufacturers, as addressing schemes may differ.

Memory IC FAQ

Can the 128-bit serial number be modified after production?

No, the 128-bit serial number is permanently locked and cannot be written or modified after the factory programming process.

What happens if the A0, A1, and A2 pins are left floating?

These pins are internally pulled down to GND by default. However, Microchip recommends connecting them to a known state to prevent issues from capacitive coupling.