11AA040-I/SN

Overview

The Microchip Technology 11AA040-I/SN is a 4Kbit (512 x 8) serial EEPROM utilizing the UNI/O single-wire interface. It operates within a supply voltage range of 1.8V to 5.5V and supports a maximum bus frequency of 100 kHz. The device features a 16-byte page write buffer, self-timed write cycles, and block write protection. It is housed in an 8-lead SOIC package and rated for industrial temperatures from -40°C to +85°C.

Feature Summary

• Supports the patented UNI/O single I/O serial protocol using Manchester encoding on the SCIO pin.
• Includes built-in power-on/off data protection and a write enable latch for array security.
• 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 via a discrete I/O line configured for the UNI/O protocol.
• Storage of calibration data or configuration parameters in low-pin-count embedded systems.
• Applications requiring minimal board space and reduced wiring complexity due to single-wire communication.

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the device address hardwiring aligns with system bus requirements. Ensure the design accounts for the 1.8V minimum operating voltage if applicable to the target application environment.

Selection Notes

Select this component when a single-wire interface is preferred over multi-wire protocols like SPI or I2C to conserve GPIO pins. Choose this part for designs requiring robust noise immunity through Schmitt triggers and low standby current consumption. Ensure the host controller can generate the specific Manchester-encoded timing required by the UNI/O bus.

Part Context

This device belongs to the 11XX family of serial EEPROMs, which includes densities ranging from 1Kbit to 16Kbit. The 'AA' designation indicates support for low-voltage operation down to 1.8V, distinguishing it from the 'LC' series which requires a minimum of 2.5V. All devices in this family share the same UNI/O command set and physical interface characteristics.

Replacement Considerations

The 11LC040-I/SN serves as a functional substitute but requires a minimum supply voltage of 2.5V instead of 1.8V. Other members of the 11AA040 family, such as those in MSOP or PDIP packages, are compatible regarding electrical specifications and pinout.