93AA66XT/SN

Memory IC Overview

The Microchip 93AA66XT/SN is a 4K Microwire serial EEPROM in an 8-lead SOIC package. It features a 1.8V to 5.5V supply range and supports clock frequencies up to 2 MHz at VCC ≥ 4.5V, or 1 MHz below that threshold. The device offers 512 x 8 or 256 x 16-bit organization selectable via the ORG pin. It ensures 1,000,000 write/erase cycles with data retention exceeding 200 years. Operating temperatures span from -40°C to +85°C for the Industrial grade.

Memory IC Feature Summary

• Supports low-voltage programming operations down to 1.8V using low-power CMOS technology.
• Features self-timed erase and write cycles including auto-erase functionality.
• Includes power on/off data protection circuitry to inhibit programming during voltage transitions.
• Provides industry-standard 3-wire serial I/O with a device status signal during programming.

Memory IC Applications

• Low power nonvolatile memory applications
• Industrial control systems requiring extended temperature ranges
• Automotive electronics utilizing robust data retention

Memory IC Procurement Notes

Verify the specific suffix 'XT' against official documentation, as standard datasheets list 'X' for rotated pinout and 'T' for tape and reel packaging. Confirm the exact temperature grade and voltage specifications match your system requirements before finalizing procurement orders.

Memory IC Selection Notes

Select this component when a 4K capacity Microwire interface is required within a narrow SOIC footprint. Ensure the design accommodates the 1.8V minimum operating voltage if targeting ultra-low power consumption. Verify that the master controller can handle the synchronous 3-wire protocol timing constraints.

Memory IC Part Context

This part belongs to the 93AA46/56/66 series of Microwire compatible serial EEPROMs. The 'X' designation indicates a rotated pin-out configuration available exclusively in the SN package type. This series serves as a legacy alternative to newer C-series devices like the 93AA66C.

Memory IC Replacement Considerations

Microchip recommends using the 93AA66C instead of this device for new designs. Verify compatibility with the 93AA66C regarding pinout and instruction set differences before substituting.