78Q2123/78Q2133 MicroPHY™
10/100BASE-TX Transceiver
Simplifying System IntegrationTM
DATA SHEET
April 2010
DESCRIPTION
FEATURES
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.
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
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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
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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
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Power-saving and power-down modes including
transmitter disable
2 Programmable LED indicators (Link and
Activity by default)
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.
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User programmable Interrupt pin
Package: 32-QFN (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
4B/5B Encoder,
100M
MRZ/NRZI
MLT3 Encoder
Pulse Shaper
and Filter
Scrambler,
RXC
TXC
RXD
TXD
SMI
Parallel/Serial
Tx/Rx
Rx/Tx
TX CLK GEN
Auto
MDI-X
Mux
MII
10M
Parallel/Serial,
Manchester Encoder
Auto
Negotiation
Carrier Sense,
Collision Detect
10M
Adaptive EQ,
Baseline Wander Correct,
MLT3 Decode, NRZI/NRZ
100M
Manchester Decoder,
Parallel/Serial
CLK
Recovery
MII
Registers
Serial/Parallel
Descrambler,
5B/4B Decoder
LEDs
Clock Reference
Link
Act
25MHz
CLKIN
Rev. 1.6
© 2010 Teridian Semiconductor Corporation
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