11AA020T-I/MS

Overview

The Microchip Technology 11AA020T-I/MS is a 2 Kbit (256 x 8) serial EEPROM utilizing the UNI/O single I/O bus interface. It operates within a supply voltage range of 1.8 V to 5.5 V and supports a maximum bit rate of 100 kHz. The device features a 16-byte page-write buffer, self-timed write cycles, and block write protection capabilities. It is housed in an MSOP-8 package and is rated for industrial temperature operation from -40°C to +85°C.

Feature Summary

• Supports the patented UNI/O single I/O serial bus protocol using Manchester encoding on the SCIO pin.
• Includes built-in power-on/off data protection circuitry and a write enable latch for enhanced reliability.
• Features Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.
• Provides hardware block write protection allowing configuration to protect none, 1/4, 1/2, or all of the memory array.

Applications

• Interfacing with microcontrollers requiring low-pin-count non-volatile storage
• Embedded systems needing compact serial memory solutions
• Industrial applications requiring robust data retention and write protection

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm that the device address bits are compatible with the system bus architecture. Ensure that the supply voltage levels align with the operational requirements of the host controller. Check for any specific humidity sensitivity handling instructions during assembly.

Selection Notes

Select this component when a single-wire interface is necessary to minimize pin count on the host processor. Consider the 1.8 V minimum operating voltage for low-power designs. Evaluate the 16-byte page buffer size against the application's write frequency and burst requirements. Ensure the industrial temperature range meets the environmental conditions of the target deployment.

Part Context

This part belongs to the 11AAXXX family of serial EEPROMs from Microchip Technology. The family shares common architectural features including the UNI/O interface and similar command sets. Variations within the family typically involve differences in memory density, such as 1 Kbit or 16 Kbit options, and package availability.

Replacement Considerations

Compatible substitutes include other devices from the 11AAXXX series, such as the 11AA010 or 11AA040, provided the memory organization and interface timing remain compatible with the existing design constraints.

FAQ

How does the UNI/O interface manage clock and data signals?

The UNI/O interface combines the clock and data into a single serial bit stream (SCIO) using Manchester encoding techniques, allowing the receiver to extract the clock signal to decode timing and values.

What happens if a page write operation crosses a physical page boundary?

If a page write attempts to cross a physical page boundary, the internal address counter rolls over to the beginning of the current page, causing further received data to overwrite previously stored data instead of writing to the next page.