11LC040-E/P

Overview

The Microchip Technology 11LC040-E/P is a 4Kbit (512 x 8) serial EEPROM utilizing the UNI/O single-wire interface. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock 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 PDIP package and rated for an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Supports the patented UNI/O single I/O serial bus protocol using Manchester encoding.
• Includes built-in power-on/off data protection and a write enable latch mechanism.
• 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 a single I/O line for non-volatile storage.
• ASIC applications needing low-pin-count serial memory access.
• Systems requiring robust data retention and high endurance in harsh environments.

Procurement Notes

Verify that the specific ordering suffix corresponds to the Automotive temperature grade (-40°C to +125°C) and the PDIP package type. Confirm that the device address code matches the system requirements, as this model utilizes a hardwired device code distinct from other variants in the family. Ensure compatibility with the master controller's UNI/O protocol implementation.

Selection Notes

Select this component when a single-wire interface is required to minimize pin count on the PCB. It is suitable for designs operating between 2.5V and 5.5V where low standby current is beneficial. Choose this part over the Industrial grade variant if the application demands operation up to +125°C ambient temperature.

Part Context

This device belongs to the 11XX family of Serial Electrically Erasable PROMs, which includes densities ranging from 1Kbit to 16Kbit. The family shares common architectural features such as the UNI/O interface and similar command sets, differing primarily in density, device address codes, and temperature grades.

Replacement Considerations

The 11LC040-I/P is a compatible alternative offering identical electrical specifications but limited to the Industrial temperature range (-40°C to +85°C).

FAQ

How does the device handle synchronization with the master?

The device uses a start header consisting of a low pulse followed by an 8-bit '01010101' code to synchronize its internal clock period with the master's clock period.

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

If a page write attempts to cross a boundary, the data wraps around to the beginning of the current page instead of writing to the next page.