93LC66XT/SN

Memory IC Overview

The Microchip 93LC66XT/SN is a 4Kbit (512 x 8 or 256 x 16) Microwire serial EEPROM in an 8-lead SOIC package. It operates on a single supply from 2.5V to 5.5V with typical active read current of 100µA at 2.5V and standby current of 3µA. The device supports clock frequencies up to 2 MHz at VCC ≥ 4.5V and 1 MHz below that threshold. It features self-timed erase/write cycles, data retention exceeding 200 years, and endurance of 1 million E/W cycles. The 'X' suffix indicates a rotated pinout configuration available exclusively in the SN package.

Memory IC Feature Summary

• Rotated pinout configuration for flexible PCB layout
• Single-supply operation down to 2.5V with low power consumption
• Hardware data protection against accidental writes during power transitions
• Ready/Busy status signaling via Data Output pin

Memory IC Applications

• Low-power nonvolatile memory storage
• Industrial control systems requiring parameter retention
• Microwire bus interface applications
• Automotive electronics (subject to specific qualification verification)

Memory IC Procurement Notes

Verify the 'X' suffix denotes the rotated pinout variant compatible only with the SN package. Confirm industrial temperature range (-40°C to +85°C) matches application requirements. Check datasheet revision history for any operational updates or errata associated with this specific part number before finalizing procurement specifications.

Memory IC Selection Notes

Select this component when a rotated pinout is required for space-constrained designs using SOIC-8 packages. Ensure the system voltage remains within the 2.5V to 5.5V operating range. Consider the 1 MHz clock limit if operating below 4.5V. Verify that the Microwire interface timing constraints align with the master controller's capabilities.

Memory IC Part Context

This device belongs to the 93LC46/56/66 family of low-voltage serial EEPROMs. The 93LC66 variant provides 4Kbit capacity. The 'XT' suffix specifically identifies the tape-and-reel version of the rotated pinout device. This family is designed for CMOS low-power applications requiring reliable nonvolatile data storage.

Memory IC Replacement Considerations

Standard 93LC66-I/SN offers identical electrical characteristics but lacks the rotated pinout. 93LC66C series devices are recommended for new designs as they supersede the older 93LC66 family. Verify pin compatibility before substituting standard SOIC variants.