AT24CS16-MAHM-E

Memory IC Overview

The AT24CS16-MAHM-E is a 16-Kbit (2,048 x 8) I²C-compatible serial EEPROM manufactured by Microchip Technology. It features a unique, factory-programmed 128-bit serial number permanently locked during production. The device operates within a supply voltage range of 1.7V to 5.5V and supports industrial temperatures from -40°C to +85°C. It offers Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast Mode Plus (1 MHz at 2.5V to 5.5V). Key electrical characteristics include a maximum active current of 3 mA and standby current of 6 µA. Endurance is rated for 1,000,000 write cycles with 100-year data retention.

Memory IC Feature Summary

• Includes a permanent, read-only 128-bit factory-programmed serial number unique across the CS Series.
• Supports bidirectional data transfer via an I²C-compatible two-wire serial interface with noise suppression filters.
• Provides hardware data protection through a dedicated Write-Protect pin that inhibits all write operations when biased high.
• Features ultra-low power consumption with specified maximum active and standby current limits.

Memory IC Applications

• Industrial systems requiring low-power memory with device identification
• Commercial applications needing hardware-level data protection
• Manufacturing lines utilizing factory serialization for product tracking

Memory IC Procurement Notes

Verify the specific package variant against the ordering suffix, as the MAHM-E designation corresponds to the 8-pad UDFN package. Confirm that the application environment remains within the specified 1.7V to 5.5V supply range and -40°C to +85°C temperature limits. Ensure the system design accounts for the internal pull-down on the Write-Protect pin if the pin state is not actively driven. Cross-reference the datasheet revision history for any updates regarding electrical specifications or packaging changes prior to final procurement.

Memory IC Selection Notes

Select this component when a unique hardware identifier is required alongside standard non-volatile storage capabilities. The inclusion of the 128-bit serial number eliminates the need for external serialization processes during manufacturing. Choose this part over standard EEPROMs if the application demands hardware write protection via the WP pin. Consider the available packages, specifically the space-saving UDFN option, for designs with strict footprint constraints.

Memory IC Part Context

This device belongs to the AT24CS series of serial EEPROMs, which are distinguished by their integrated factory-programmed serial numbers. Unlike standard EEPROMs in the AT24C family, the CS series ensures uniqueness across the entire line regardless of memory size or interface protocol. This allows for seamless migration between different memory capacities while maintaining valid serial number references in deployed systems.

Memory IC Replacement Considerations

Standard AT24C16 devices lack the unique serial number feature. Direct replacements must be sourced from the AT24CS16 family to maintain serialization compatibility. Verify that substitute parts support the same I²C modes and voltage ranges required by the existing circuit design.

Memory IC FAQ

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

No, the 128-bit serial number is programmed and permanently locked during the Microchip production process. It cannot be altered or overwritten by the user.

What happens if the Write-Protect pin is left floating?

If the Write-Protect pin is left floating, it is internally pulled down to GND, allowing normal write operations. However, Microchip recommends connecting it to a known state to prevent issues caused by capacitive coupling.

Does the serial number occupy user-accessible memory?

No, the 128-bit serial number is stored in a separate memory block and does not consume any of the user read/write area of the 16-Kbit Serial EEPROM.