FDC37B787-NS

Specialized Overview

The FDC37B78x is a Super I/O controller featuring ACPI support, a Real Time Clock, and Consumer IR capabilities. It operates at 5V and complies with PC98/99 and ACPI 1.0 standards. The device integrates an ISA Plug-and-Play compatible register set with 12 IRQ options, 15 Serial IRQ options, 16-bit address qualification, and four DMA options. It includes 20 GPI/O pins, a 32KHz standby clock output, soft power management, and SCI/SMI support. Key peripherals include an 8042 keyboard controller with 2KB ROM and 256 bytes RAM, a battery-backed RTC with 256 bytes CMOS, a 2.88MB floppy disk controller, two NS16C550-compatible UARTs, and a multi-mode parallel port with ChiProtect.

Specialized Feature Summary

• Integrates an 8042 keyboard controller with asynchronous access to data registers and fast Gate A20 support.
• Includes a true CMOS 765B floppy disk controller core with advanced digital data separator requiring no external filter components.
• Features two high-speed NS16C550 compatible UARTs with 16-byte FIFOs and support for IrDA 1.0 and Consumer IR.
• Provides a multi-mode parallel port supporting Standard, EPP 1.7/1.9, and ECP modes with ChiProtect circuitry.

Specialized Applications

• ISA Plug-and-Play compatible system designs
• ACPI 1.0 compliant motherboard implementations
• Systems requiring integrated real-time clock and battery backup functionality

Specialized Procurement Notes

Verify the specific ordering suffix to confirm package type and compliance status. The -NS suffix indicates a lead-free RoHS compliant package in a 128-pin QFP format. Confirm that the required logical devices such as the floppy disk controller and serial ports are enabled via configuration registers before integration into the host system architecture.

Specialized Selection Notes

Select this component for systems requiring a consolidated Super I/O solution with legacy ISA compatibility and modern ACPI power management features. Ensure the design supports the 5V operation voltage and accommodates the 128-pin QFP footprint. Verify that the host processor interface can handle the specified 12mA AT bus driver requirements and that the available I/O base addresses align with the system's resource allocation constraints.

Specialized Part Context

The FDC37B78x belongs to the FDC37B78x series of Super I/O controllers manufactured by SMSC (now part of Microchip Technology). This series is designed to replace discrete logic chips in PC architectures by integrating multiple peripheral controllers into a single package. The device supports both legacy PC98/99 standards and newer ACPI specifications, making it suitable for transitional hardware designs.

Specialized Replacement Considerations

The FDC37B78QFP is the standard variant of this component in a 128-pin QFP package. When replacing the -NS version, ensure that the lead-free RoHS compliance requirement is met by the substitute part. Verify pinout compatibility and electrical characteristics, particularly the drive strengths and voltage levels, to maintain system stability.