78Q2123 Datasheet, PDF (1/42 Pages) Teridian Semiconductor Corporation – 10/100BASE-TX Transceiver

DESCRIPTION
The 78Q2123 and 78Q2133, MicroPHY^TM, 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.
The transceiver interfaces to Category-5 unshielded
twisted pair (Cat-5 UTP) cabling for 100BASE-TX
applications, and Category-3 unshielded twisted pair
(Cat-3 UTP) for 10BASE-T applications. The MDI is
connected to the line media via dual 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
78Q2123/78Q2133 are intended to serve the
embedded Ethernet market, tailored specifically to the
needs of game consoles, broadband modems,
printers, set top boxes and audio/visual equipment. It
is designed for low-power consumption and operates
from a single 3.3V supply. The 78Q2123 is rated for
commercial temperature range and the 78Q2133 is
rated for industrial temperature range.
78Q2123/78Q2133 MicroPHY™
10/100BASE-TX Transceiver
DATA SHEET
FEATURES
April 2009
• 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
RXC
TXC
RXD
TXD
SMI
Page: 1 of 42
100M
4B/5B Encoder,
Scrambler,
Parallel/Serial
MII
10M
Parallel/Serial,
Manchester Encoder
MII
Registers
Manchester Decoder,
Parallel/Serial
Serial/Parallel
Descrambler,
5B/4B Decoder
MRZ/NRZI
MLT3 Encoder
TX CLK GEN
Carrier Sense,
Collision Detect
CLK
Recovery
Clock Reference
Pulse Shaper
and Filter
Auto
Negotiation
Auto
MDI-X
Mux
Tx/Rx
Rx/Tx
10M 100M
Adaptive EQ,
Baseline Wander Correct,
MLT3 Decode, NRZI/NRZ
LEDs
CLKIN 25MHz
Link
Act
© 2009 Teridian Semiconductor Corporation
Rev 1.5