11LC161-I/MS

Overview

The Microchip Technology 11LC161-I/MS is a 16 Kbit (2048 x 8) serial electrically erasable programmable read-only memory (EEPROM). It operates within a supply voltage range of 2.5 V to 5.5 V and utilizes the UNI/O single I/O serial interface bus with a maximum clock frequency of 100 kHz. The device is housed in an 8-lead MSOP package and supports industrial temperature ranges from -40°C to +85°C.

Feature Summary

• Supports the patented UNI/O single I/O serial protocol using Manchester encoding for combined clock and data transmission on the SCIO pin.
• Includes a 16-byte page-write buffer and self-timed write cycles with automatic erase capabilities.
• Features hardware-based block write protection allowing configuration to protect none, one-quarter, one-half, or the entire memory array.

Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration value logging

Procurement Notes

Verify that the specific ordering suffix corresponds to the MSOP-8 package and Industrial temperature grade (-40°C to +85°C). Confirm the device address code '0001' matches the system design requirements for bus addressing. Ensure power supply rails remain strictly within the 2.5 V to 5.5 V operational limits to prevent damage.

Selection Notes

Select this component when a single-pin serial interface is required to minimize PCB trace count compared to standard I2C devices. The UNI/O protocol eliminates the need for separate clock lines. Verify that the master controller can implement the Manchester encoding decoding logic required for the SCIO interface.

Part Context

This part belongs to the 11LC161 family of 16 Kbit EEPROMs. It shares the same memory organization and electrical characteristics as other variants but is distinguished by its specific package type and temperature rating. The '1' in the model number indicates a hardwired device address code of '0001', differentiating it from the '0' variant.

Replacement Considerations

Direct substitutes include other 11LC161 variants with different packages such as SOIC-8 (SN) or PDIP-8 (P), provided the physical footprint allows. Cross-family replacements like the 11AA161 series require verification of voltage compatibility, as they support lower voltages down to 1.8 V.

FAQ

How does the device handle page boundary crossings during write operations?

If a page write operation attempts to cross a physical page boundary, the internal address counter rolls over to the beginning of the current page. Data intended for the next page is written over existing data at the start of the current page rather than advancing to the next page.

What is the function of the Write-In-Progress (WIP) bit?

The WIP bit in the STATUS register indicates whether the device is currently executing an internal write cycle. A value of '1' signifies that a write is in progress, while '0' indicates the device is ready for new commands.