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KSZ9021RN Single-port Gigabit Transceiver

Micrel, Inc. and Digi-Key introduce RGMII support with one of the industry’s smallest footprints

Click here to enlarge KSZ9021RN DiagramMicrel, Inc.'s KSZ9021RN is a single-port 10/100/1000 Base-T Gigabit transceiver in industry's smallest footprint, supporting data transfer over standard CAT-5 unshielded twisted pair cable. This device offers robust performance and low power consumption. On-chip integration of termination resistors and the LDO controller, along with built-in diagnostic features, significantly reduces the cost and the complexity of Gigabit Ethernet applications. This device is ideal for enabling Gigabit Ethernet performance in SOHO and SMB networking applications such as SOHO media center, wired/wireless Gigabit SOHO/SMB router, and VolP gateway. The KSZ9021GN provides the Reduced Gigabit Media Independent Interface (RGMII) for direct connection to RGMII MACs in Gigabit Ethernet processors and switches for data transfer at 1000 Mbps speed. The device is available in a RoHS-compliant 48-pin QFN package. Industrial grade is also available.

  • RGMII MAC interface
  • Integration of termination resistors on the chip
  • Integration of a LDO controller on the chip
  • LinkMD® TDR-based cable diagnostics
  • Automatic MDI/MDIX crossover for IEEE 802.3 and EIA/TIA 568 standards at all speeds of operation
  • Integrated 125 MHz reference clock

  • RoHS Compliant

  • SOHO media center
  • Voice-over-Internet protocol (VolP) gateway
  • Network attached storage
  • Laser printers and projectors
  • Wired/wireless Gigabit SOHO/SMB router media converter
  • VPN/Firewall based SMB/SME router
  • Gigabit Ethernet LAN on motherboard
  • Integrated broadband CPE (ADSL/VDSL/FTTH) router

Part Number
Part Number
Description Packaging Datasheet
576-3637-ND KSZ9021RN IC TXRX 10/100/1000 SGL 48QFN 48-QFN Datasheet