10/100BASE-TX Transceiver

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Industry's First 3.3V Fast Ethernet PHY

Part Details
  • 10BASE-T/100BASE-TX IEEE 802.3-Compliant Tx and Rx Functions Requiring a Dual 1:1 Isolation Transformer Interface to the Line
  • Integrated MII, 10BASE-T/100BASE-TX ENDEC, 100BASE-TX Scrambler/Descrambler, and Full-Featured Autonegotiation Function
  • Full-Duplex Operation Capable
  • PCS Bypass Supports 5-Bit Symbol Interface
  • Register-Programmable Transmit Amplitude
  • Dual-Speed Digital Clock Recovery
  • Automatic Polarity Correction During Autonegotiation and 10BASE-T Signal Reception
  • Power-Saving and Power-Down Modes Including Transmitter Disable
  • LED Indicators: LINK, TX, RX, COL, 100, 10, FDX
  • User-Programmable Interrupt Pin
  • 64-Pin TQFP (JEDEC LQFP) Package
  • Single 3.3V ± 0.3V Supply
Additional Details
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The 78Q2120C is a 10BASE-T/100BASE-TX Fast Ethernet transceiver. It includes integrated media independent interface (MII), ENDECs, scrambler/descrambler, dual-speed clock recovery, and full-featured autonegotiation function. The transmitter includes an on-chip pulse-shaper and a low-power line driver. The receiver has an adaptive equalizer and a baseline restoration circuit required for accurate clock and data recovery. The transceiver interfaces to Category-5 unshielded twisted pair (Cat-5 UTP) cabling for 100BASE-TX/10BASE-T and Category-3 unshielded twisted pair for 10BASE-T. Connection to the line media is through 1:1 isolation transformers. No external filter is required. Interface to the MAC is accomplished through an IEEE® 802.3-compliant MII. The product is fabricated in an advanced CMOS process for high performance and low power operation.


  • Consumer Electronics
  • IP Cameras
  • Print Servers

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