LAN91C113I-NU

Controllers Overview

The LAN91C113I-NU is a single-chip Ethernet controller designed for embedded applications, integrating MAC and PHY layers for 10/100 Mbps operation. It features an 8K-byte internal FIFO buffer and supports both 8-bit and 16-bit CPU access via a flexible slave interface. The device operates at 3.3V with 5V-tolerant I/O buffers and utilizes a 25 MHz reference clock. It includes an integrated IEEE 802.3/802.3u-compliant physical layer with auto-negotiation, adaptive equalization, and baseline drift correction. The component is housed in a 128-pin TQFP package and supports industrial temperature ranges.

Controllers Feature Summary

• Integrates MAC and PHY functions for 10/100 Mbps Ethernet connectivity on a single chip
• Features an optimized Memory Management Unit (MMU) architecture with 16-bit internal data path for high throughput
• Supports multiple embedded processor host interfaces including ARM, SH, PowerPC, ColdFire, and 680x0 families
• Includes built-in transparent arbitration for master/slave sequential access architectures

Controllers Applications

• Embedded network nodes requiring fast Ethernet connectivity
• Industrial control systems utilizing ISA or other standard bus interfaces
• Network appliances needing integrated MAC/PHY solutions without external components

Controllers Procurement Notes

Verify the manufacturer designation, as SMSC assets were acquired by Microchip Technology. Confirm that the specific suffix 'I-NU' corresponds to the intended industrial temperature range and packaging variant. Ensure compatibility with existing board designs regarding the 128-pin TQFP footprint and 3.3V power supply requirements before procurement.

Controllers Selection Notes

Select this component when a unified MAC/PHY solution is required to reduce bill of materials count. It is suitable for designs supporting 8-bit or 16-bit host buses where DMA may not be the primary transfer method. Consider the 8K-byte internal memory limit for packet buffering needs and verify support for the target embedded processor architecture's bus timing constraints.

Controllers Part Context

This part belongs to the LAN'91C series of Ethernet controllers from SMSC, now under Microchip. It represents a third-generation solution aimed at simplifying embedded Fast Ethernet implementation. The series is characterized by high integration levels, combining analog PHY circuits with digital MAC logic and memory management units in a single package.

Controllers Replacement Considerations

Direct replacements include other variants within the LAN91C113 family such as LAN91C113-NC or LAN91C113-NE, provided pinouts and electrical characteristics match. Cross-referencing with Microchip's current datasheets is essential to confirm functional equivalence and availability.