11LC161-I/SN

Overview

The Microchip Technology 11LC161-I/SN is a 16 Kbit (2048 x 8) serial electrically erasable PROM utilizing the UNI/O single I/O interface. It operates within a supply voltage range of 2.5 V to 5.5 V and supports a maximum clock frequency of 100 kHz. The device features Schmitt trigger inputs for noise suppression, output slope control, and a 16-byte page-write buffer. It offers high reliability with 1,000,000 erase/write cycles endurance and data retention exceeding 200 years. The component is housed in an 8-lead SOIC 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 write protection mechanisms such as power-on/off data protection circuitry and a write enable latch.
• Features block write protection allowing configuration to protect none, one-quarter, one-half, or all of the memory array.
• Provides self-timed write cycles with auto-erase capabilities and a status register for monitoring write progress.

Applications

• Interfacing with microcontrollers requiring low-pin-count non-volatile storage
• ASIC designs needing reliable parameter storage
• Systems utilizing discrete I/O lines configured for the UNI/O protocol

Procurement Notes

Verify that the specific part number corresponds to the Industrial temperature grade (-40°C to +85°C) and the 2.5V minimum operating voltage. Confirm the package type is 8-lead SOIC. Ensure the design accounts for the UNI/O protocol requirements rather than standard I2C interfaces. Check for RoHS compliance documentation if required by the manufacturing process.

Selection Notes

Select this component when a single-wire interface is preferred to minimize pin count compared to standard I2C devices. It is suitable for applications requiring robust noise immunity due to Schmitt trigger inputs. Consider the 16-byte page buffer size for write efficiency. Ensure the system voltage remains above 2.5V, as lower voltages are not supported by this specific LC variant.

Part Context

This device belongs to the 11XX family of Serial Electrically Erasable PROMs, which includes densities ranging from 1 Kbit to 16 Kbit. The family supports both UNI/O and I2C interfaces depending on the specific sub-series. The 11LC series specifically denotes devices operating with a minimum supply voltage of 2.5V, distinguishing them from the 11AA series which supports 1.8V operation.

Replacement Considerations

The 11AA161-I/SN serves as a functional substitute within the same family, offering identical memory organization and interface but supporting a lower minimum supply voltage of 1.8V. Other 11LC161 variants exist with different packages or temperature grades.