DS2432P-W0F+1T

Memory IC Overview

The DS2432P-W0F+1T is a 1Kb Protected 1-Wire EEPROM featuring an integrated SHA-1 engine. It contains 1128 bits of 5V EEPROM memory, partitioned into four 256-bit pages, a 64-bit write-only secret, and up to five general-purpose read/write registers. The device operates within a voltage range of 2.8V to 5.25V across temperatures from -40°C to +85°C. Communication occurs via the 1-Wire protocol at speeds up to 15.3kbps, or 90.9kbps in Overdrive mode.

Memory IC Feature Summary

• Integrates a 512-bit SHA-1 engine for computing 160-bit Message Authentication Codes (MACs) and generating secrets.
• Enforces write access authorization requiring knowledge of the secret and transmission of a valid MAC.
• Includes a unique factory-lasered 64-bit registration number ensuring absolute traceability.
• Supports hardware write protection for all memory or Page 0 only, and EPROM-emulation mode.

Memory IC Applications

• Intellectual property security
• After-market management of consumables
• Tamper-proof data carriers

Memory IC Procurement Notes

Verify that the ordering suffix matches the required package type, as the datasheet lists TSOC and UCSP options. Confirm RoHS compliance status indicated by the plus sign. Ensure the temperature grade aligns with system requirements. Check for specific tape and reel packaging if high-volume assembly is planned. Validate pin configurations against the target PCB footprint.

Memory IC Selection Notes

Select this component when secure, authenticated storage is required on a single-wire bus. The built-in SHA-1 engine eliminates the need for external cryptographic processors. Consider the low pin count and multidrop capability for space-constrained designs. Evaluate the write cycle endurance and data retention specifications against application longevity needs.

Memory IC Part Context

This part belongs to the Maxim Integrated DS2432 family of protected 1-Wire EEPROMs. It combines non-volatile memory with cryptographic functions to prevent unauthorized modification. The device is designed for applications demanding high security and traceability through unique identification codes.

Memory IC Replacement Considerations

DS2432P+ is a direct equivalent in the same package. DS2432X-S+ offers the same functionality in an 8-pin UCSP package. Verify pin compatibility and package dimensions before substitution.

Memory IC FAQ

How does the device handle write authorization?

Write access requires the master to compute and transmit a 160-bit MAC using the device's secret and stored data. Without a matching MAC, the copy scratchpad command will not execute.

What is the purpose of the scratchpad?

The scratchpad acts as an intermediate buffer for writing to main memory, loading a new secret, or writing to the register page. Data must be verified in the scratchpad before being copied to its final location.