SCH3222-SX-TR

Overview

The SCH3222-SX-TR is a Super I/O controller from Microchip Technology, operating at 3.3V with a 5V-tolerant SIO block. It features an LPC interface supporting bus frequencies of 19MHz to 33MHz and includes an ISA Plug-and-Play compatible register set. The device integrates four full-function serial ports (NS16C550A compatible UARTs) and two additional 4-pin serial ports. Key peripherals include an 8042 software-compatible keyboard/mouse controller, an IrDA 1.0 infrared port, and General Purpose I/O pins. It supports ACPI 2.0 compliance, System Management Interrupts, and programmable wake-up events.

Feature Summary

• LPC Interface: Supports bus frequencies of 19MHz to 33MHz with ISA Plug-and-Play compatibility.
• Serial Ports: Includes four full-function NS16C550A compatible UARTs with 16-byte FIFOs and two additional 4-pin serial ports.
• Keyboard Controller: Features an 8042 software-compatible controller with 2k Bytes Program ROM and 256 Bytes Data RAM.
• Infrared Port: Multiprotocol IrDA 1.0 compliant interface supporting SHARP ASK IR.

Applications

• Motherboard Glue Logic
• Industrial Control Systems
• Embedded PC Applications

Procurement Notes

Verify the specific suffix 'SX' against official documentation for temperature range and package details. Confirm RoHS compliance status as per the datasheet revision. Ensure the ordering suffix matches the required commercial or industrial grade specifications before procurement.

Selection Notes

Select the SCH3222 variant when hardware monitoring and parallel port functionalities are not required, as these are reserved for other family members like the SCH3227 and SCH3224. Verify that the 84-ball WFBGA package meets the board layout constraints. Check strap options if legacy feature compatibility is needed.

Part Context

The SCH3222 belongs to the SCH322x Product Family, which serves as the next generation of the SCH311x components. This family provides Super I/O functionality with enhanced security features and power control logic. The SCH3222 specifically offers a reduced pin count compared to the SCH3227 and SCH3226, omitting hardware monitoring and parallel port interfaces.

Replacement Considerations

The SCH311x family components are referenced as predecessors. However, direct replacement requires verification of pin compatibility and internal configuration defaults, as the SCH322x family introduces new pin functions and identification codes based on strapping options.