DESCRIPTION
The 78Q2123 and 78Q2133, MicroPHYTM, are the smallest 10BASE-T/100BASE-TX Fast Ethernet transceivers in the market. They include integrated MII, ENDECs, scrambler/descrambler, dual-speed clock recovery, and full-featured auto-negotiation functions. 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.
   
FEATURES
• Smallest 10/100 PHY available
• 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 auto-negotiation function
• Full duplex operation capable
• Automatic MDI/MDI-X cross over correction
• Register-programmable transmit amplitude
• Automatic polarity correction during
    auto-negotiation and 10BASE-T signal reception
• Power-saving and power-down modes
    including transmitter disable
• 2 Programmable LED indicators (Link and
    Activity by default)
• User programmable Interrupt pin
• Package: 32-QFN (5x5 mm)
    32-TPFP (5x5 mm)
• Low Power (~290mW)
• Single 3.3 V ± 0.3V Supply
• 78Q2123 rated for 0°C to 70°C operation
• 78Q2133 rated for -40°C to 85°C operation