Microchip Technology LAN8840 Gigabit Ethernet Transceivers

Microchip Technology LAN8840 Gigabit Ethernet (GbE) Transceivers are integrated triple-speed (10BASE-T/100BASE-TX/1000BASE-T) Ethernet physical-layer transceivers for transmission and reception of data. These transceivers provide switches for data transfer at 10Mbps/100Mbps/1000Mbps and Reduced Gigabit Media Independent Interface (RGMII) for direct connection to RGMII MACs. The LAN8840 transceivers feature on-chip termination resistors to indicate differential pair and signal quality. These transceivers feature RGMII with 3.3V/2.5V/1.8V tolerant I/Os and IEEE 1588v2 support. The LAN8840 transceivers feature an interrupt pin option, power-down and power-saving modes, and baseline wander correction. These transceivers offer Wake-On-LAN (WOL) support with robust custom packet detection and programmable LED outputs for link, activity, and speed.

The LAN8840 transceivers simplify board layout using on-chip termination resistors and reduce board cost by integrating an LDO controller. These transceivers operate at -40°C to 105°C extended industrial temperature range. The LAN8840 transceivers are ideally used in industrial control, game console, IPTV, broadband gateway, laser/network printers, network servers, and IP set-top boxes.

Features

  • Single-chip 10Mbps/100Mbps/1000Mbps Ethernet transceivers suitable for IEEE 802.3 applications
  • On-chip termination resistors for the differential pairs
  • Jumbo frame support upto 16KB
  • 125MHz reference clock output
  • Energy detects power down mode for reduced power consumption when the cable is not attached
  • Wake-On-LAN (WOL) support with robust custom packet detection
  • Programmable LED outputs for link, activity, and speed
  • Baseline wander correction
  • LinkMD® TDR-based cable diagnostic to identify faulty copper cabling
  • EtherSynch® technology IEEE 1588v2/PTP
  • Energy Efficient Ethernet (EEE) support with Low-Power Idle (LPI) mode and clock stoppage for 100BASE-TX/1000BASE-T
  • Transmit amplitude reduction with the 10BASE-Te option
  • Five programmable LED outputs for link, activity, and speed offering LAN8840 gigabit Ethernet transceivers
  • Signal quality indication
  • MDC/MDIO management interface for PHY register configuration
  • Loopback modes for diagnostics
  • Automatic detection and correction of pair swaps, pair skew, and pair polarity
  • Parametric NAND tree support to detect faults between chip I/Os and board
  • Interrupt pin option
  • Power-down and power-saving modes

Specifications

  • 48-pin VQFN (7mm × 7mm) package
  • Upto 16KB jumbo frame support
  • -40°C to 105°C extended industrial operating temperature range

Applications

  • Industrial control
  • Laser/network printer
  • Network Attached Storage (NAS)
  • Network server
  • Gigabit LAN On The Motherboard (GLOM)
  • Broadband gateway
  • Gigabit SOHO/SMB router
  • IPTV
  • IP set-top box
  • Game console
  • Triple play (data, voice, and video) media center

System Block Diagram

Block Diagram - Microchip Technology LAN8840 Gigabit Ethernet Transceivers

LAN8840 Block Diagram

Block Diagram - Microchip Technology LAN8840 Gigabit Ethernet Transceivers

Microchip Technology LAN8840 Gigabit Ethernet Transceivers