LAN91C111I-NS

Controllers Overview

The LAN91C111I-NS is a single-chip Ethernet controller integrating MAC and PHY layers for 10/100 Mbps networks. It operates on a 3.3V supply with 5V tolerant I/O buffers. The device features an 8 Kbyte internal FIFO buffer, supports 8, 16, and 32-bit host interfaces (ISA, ARM, PowerPC), and includes auto-negotiation capabilities. It utilizes a 25 MHz reference clock and provides MII management interface support. The component is housed in a 128-pin QFP package and is rated for an industrial temperature range of -40°C to +85°C.

Controllers Feature Summary

• Integrates IEEE 802.3/802.3u compliant MAC and PHY layers into a single mixed-signal device.
• Supports flexible host bus connectivity via 8, 16, or 32-bit parallel interfaces compatible with various embedded processors.
• Includes internal 8 Kbyte memory for dynamic transmit and receive FIFO buffering.
• Features on-chip wave shaping and adaptive equalizer eliminating the need for external filters.

Controllers Applications

• Embedded system network interface design
• Industrial automation controllers
• Network adapter cards and switching hubs

Controllers Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature grade (-40°C to +85°C) distinct from commercial variants. Confirm the 'NS' suffix corresponds to the 128-pin QFP package as documented in the datasheet pin configurations. Ensure RoHS compliance status matches current manufacturing revisions.

Controllers Selection Notes

Select this component when a non-PCI solution is required for embedded architectures. It is suitable for systems needing direct ISA or generic RISC processor interfacing without additional bridge chips. Consider the 3.3V power requirement and 5V I/O tolerance for level shifting compatibility.

Controllers Part Context

This part belongs to the LAN91C111 family of Fast Ethernet controllers originally developed by SMSC and now manufactured by Microchip Technology. It serves as a third-generation solution designed to replace older discrete MAC/PHY implementations in embedded applications requiring cost-effective networking.

Controllers Replacement Considerations

LAN91C111I-NU (TQFP Package)

Controllers FAQ

Does the LAN91C111I-NS require external filters for 100Base-TX operation?

No, the device includes internal output wave shaping circuitry and on-chip filters, eliminating the need for external filters typically required in 100Base-TX applications.

What is the maximum frequency for the local bus clock (LCLK)?

The maximum frequency for the LCLK is 50 MHz in VL Bus mode, limited to 8.33 MHz for EISA slave DMA burst mode.