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