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78Q2120C

Teridian
Part Number 78Q2120C
Manufacturer Teridian
Description 10/100BASE-TX Transceiver
Published Oct 19, 2015
Detailed Description 78Q2120C 10/100BASE-TX Transceiver DATA SHEET DESCRIPTION The 78Q2120C is a 10BASE-T/100BASE-TX Fast Ethernet transceiv...
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78Q2120C
78Q2120C

Overview
78Q2120C 10/100BASE-TX Transceiver DATA SHEET 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.
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 (Cat5 UTP) cabling for 100BASE-TX/10BASE-T and Category-3 unshielded twisted pair for 10BASE-T.
Connection to the line media is via 1:1 isolation transformers.
No external filter is required.
Interface to the MAC is accomplished through an IEEE-802.
3 compliant Media Independent Interface (MII).
The product is fabricated in an advanced CMOS process for high performance and low power operation.
FEATURES JULY 2005 • 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 • 64-Pin TQFP (JEDEC LQFP) package • Single 3.
3 V ± 0.
3V Supply BLOCK DIAGRAM RX_CLK TX_CLK RXD[3:0] TXD[3:0] 4B/5B Encoder, 100M Scrambler, Parallel/Serial NRZ/NRZI MLT3 Encoder MII Registers & Interface Logic 10M Parallel/Serial, MMaanncchheesstteerr EEnnccooddeerr TX CLK GEN Manchester Decoder, Parallel/Serial Carrier Sense, CCoollliissiioonn DDeetteecctt CLK Recovery Serial/Parallel Descrambler, 5B/4B Dec...


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