AT93C66A-10SU-1.8

Memory IC Overview

The AT93C66A-10SU-1.8 is a 4K-bit (512 x 8 or 256 x 16) serial EEPROM featuring a three-wire Microwire interface. It operates within a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 2 MHz at 5V. The device utilizes an 8-lead JEDEC SOIC package and functions across an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Supports user-selectable internal memory organization for either 8-bit or 16-bit word widths via the ORG pin configuration.
• Features self-timed write cycles with automatic erase-before-write functionality, eliminating the need for separate erase commands.
• Provides hardware and software data protection through dedicated Erase/Write Enable and Disable instructions.

Memory IC Applications

• Industrial applications requiring low-power and low-voltage operations
• Commercial applications needing non-volatile parameter storage
• Systems utilizing simple three-wire serial communication interfaces

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required voltage range and package type. Confirm compliance with RoHS standards and lead finish specifications. Ensure the design accounts for the component's status as not recommended for new designs, considering long-term availability implications.

Memory IC Selection Notes

Select this component when a 4K-bit capacity is required with a three-wire interface. Choose the -1.8 suffix for systems operating between 1.8V and 5.5V. Verify that the 8-lead SOIC package dimensions fit the PCB layout constraints and that the industrial temperature rating meets environmental requirements.

Memory IC Part Context

This part belongs to the AT93C56A/66A family of serial EEPROMs manufactured by Microchip Technology. The datasheet explicitly states that this series is not recommended for new designs and has been replaced by the AT93C56B and AT93C66B series.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: AT93C66B-SSHM-T, 93AA66A-I/P, 93C66A-I/P, 93AA66AT-I/MS, AT93C66B-MAHM-E, 93LC66A/P.

Memory IC FAQ

How is the internal memory organization configured?

The organization is selected by connecting the ORG pin to VCC for 16-bit mode or to ground for 8-bit mode.

What is the maximum clock frequency?

The device supports a clock rate of 2 MHz when the supply voltage is 5V.