78Q2120C Overview
Description
The 78Q2120C is a 10BASE-T/100BASE-TX Fast Ethernet transceiver. It includes integrated MII, ENDECs, scrambler/descrambler, dual-speed clock recovery, and full-featured auto-negotiation function.
Key Features
- 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 fullfeatured auto-negotiation 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
