SCH3114-NU

Specialized Overview

The SCH3114-NU is a Super I/O controller manufactured by Microchip Technology, housed in a 128-pin VTQFP package. It operates at 3.3V with a 5V-tolerant SIO block and supports LPC bus frequencies from 19MHz to 33MHz. The device includes four full-function serial ports, an enhanced digital data separator, and a CMOS 765B floppy disk controller. It features 40 general-purpose I/O pins, hardware monitoring for voltage and temperature, and an 8042-compatible keyboard controller. Industrial temperature range availability spans -40°C to +85°C.

Specialized Feature Summary

• Integrated legacy functionality including an 8042-based keyboard/mouse controller and IEEE 1284 parallel port
• Hardware monitoring capabilities with automatic fan control and thermal diode sensing
• Support for multiple low power-down modes via ACPI 2.0 compliance
• Enhanced security features with a 32-byte device authentication register

Specialized Applications

• PC99/PC2001 compliant motherboard designs
• Industrial embedded systems requiring robust I/O control
• Legacy peripheral integration in modern Super I/O architectures

Specialized Procurement Notes

Verify the specific suffix requirements against current Microchip documentation before ordering. Confirm that the industrial temperature grade (-40°C to +85°C) matches the application environment. Check for any product change notifications or end-of-life status updates directly from the manufacturer. Ensure compatibility with existing BIOS configurations and LPC interface standards.

Specialized Selection Notes

Select the SCH3114-NU when four full-function serial ports are required alongside standard Super I/O features. Compare against the SCH3112 if only two serial ports are needed, or the SCH3116 if additional four-pin serial interfaces are necessary. Verify that the 128-pin VTQFP package fits the PCB layout constraints. Ensure the system design accommodates the 3.3V supply and 5V-tolerant inputs.

Specialized Part Context

This component belongs to the SCH3112/SCH3114/SCH3116 product family of LPC IO controllers. These devices consolidate legacy Super I/O functions into a single chip, reducing board space and complexity. The SCH3114 variant specifically provides four full-function UARTs, distinguishing it from the two-port SCH3112 and the mixed-interface SCH3116.

Specialized Replacement Considerations

Direct replacements within the same family include the SCH3112-NU (2 serial ports) and SCH3116-NU (4 full-function plus 2 four-pin serial ports). Verify pinout compatibility and software configuration differences before substituting.