LAN91C100FDTQFP

Controllers Overview

The LAN91C100FDTQFP is a Fast Ethernet controller manufactured by SMSC, designed for non-PCI embedded applications. It integrates a dual-speed CSMA/CD engine supporting 10 Mbps and 100 Mbps data rates in compliance with IEEE 802.3 standards. The device features a 32-bit wide data path into packet buffer memory and supports external memory configurations up to 128 Kbytes. It accommodates 32, 16, and 8-bit CPU accesses via synchronous, asynchronous, or burst DMA interface modes. The controller includes an MII-compliant MAC-PHY interface running at nibble rate and provides full duplex capability with early TX/RX functions.

Controllers Feature Summary

• Dual speed operation supporting both 10 Mbps and 100 Mbps Ethernet speeds
• Integrated flat MMU architecture with symmetric transmit and receive structures
• Support for multiple bus widths including 32, 16, and 8-bit CPU accesses
• MII compliant MAC-PHY interface for connection to external PHY devices

Controllers Applications

• Non-PCI embedded network systems requiring 10/100 Mbps connectivity
• Industrial control networks utilizing full duplex switched Ethernet
• Embedded devices needing transparent arbitration for slave sequential access

Controllers Procurement Notes

Verify the specific suffix designation when ordering, as the LAN91C100-FD-ST variant denotes a green lead-free package in the 208-pin TQFP form factor. Confirm that the required pinout and electrical characteristics match the datasheet specifications for the intended PCB layout. Ensure compatibility with the host system's bus width and DMA requirements before finalizing procurement.

Controllers Selection Notes

Select this component for designs requiring a standalone MAC controller without integrated PHY functionality. It is suitable for applications where an external PHY must be connected via the MII interface. Consider the 208-pin TQFP package constraints for board space. Verify support for the necessary external memory size if utilizing the built-in packet buffer capabilities beyond internal FIFOs.

Controllers Part Context

This part belongs to the LAN91C100 family of Fast Ethernet controllers from SMSC. It shares architectural similarities with the LAN91C111 series but differs in specific feature sets such as memory configuration and interface options. The LAN91C100FD variant specifically emphasizes full duplex capability and advanced DMA modes compared to earlier single-speed controllers.

Controllers Replacement Considerations

The LAN91C100-FD-SS is a lead-free alternative within the same package family. For broader replacements, consider the LAN91C111 series for similar non-PCI Ethernet control functions, though pinouts and specific feature sets may differ.