LAN91C111-NU is a legacy integrated 10/100 Ethernet MAC+PHY controller from Microchip, compatible with ISA / 8/16-bit parallel MCU buses in LQFP100 package with 8KB on-chip packet buffer. Designed for legacy 8/16-bit single-chip systems, widely used for Ethernet retrofit of traditional industrial equipment & vintage data loggers.

1. Speed: 10BASE-T / 100BASE-TX Fast Ethernet 2. Host Interface: 8/16-bit parallel ISA-compatible bus 3. On-Chip Buffer: 8KB TX/RX packet RAM 4. Package: LQFP-100 5. Operating Temp: Commercial grade 0℃ ~ +70℃ 6. Integration: Full MAC controller + single-port PHY transceiver on-die

1. Native support for legacy 8/16-bit MCU parallel buses, Ethernet communication without ARM/FPGA 2. All-in-one MAC+PHY minimizes peripheral circuitry for legacy equipment retrofit 3. On-die hardware TCP/IP acceleration eases MCU software computation load 4. Auto-MDI cable crossover compatibility with zero wiring restriction 5. Mature mass-production part, primary replacement part for maintenance of stock industrial hardware

1. Ethernet networking retrofit for legacy 8-bit MCU industrial control hardware 2. Network port upgrade for vintage lab measurement instruments & spectrum analyzers 3. Replacement spare parts for maintenance of legacy PLCs & data loggers 4. Low-cost Ethernet expansion boards for university teaching labs