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PDF KS8721SL Data sheet ( Hoja de datos )

Número de pieza KS8721SL
Descripción 3.3V 10/100 BASE-TX/FX PHYSICAL LAYER TRANSCEIVER
Fabricantes Micrel Semiconductor 
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KS8721BL/SL
Product Brief
3.3V 10/100BASE-TX/FX Physical Layer Transceiver
Description
The KS8721BL/SL is a 10BASE-T, 100BASE-TX, and
100BASE-FX physical layer transceiver providing MII/
RMII interfaces to MACs and switches. Using a unique
mixed-signal design that extends signaling distance while
reducing power consumption, the KS8721BL/SL repre-
sents Micrels fourth generation single-port Fast Ethernet
PHY.
Micrels architecture dissipates an ultra-low 275mW in
power, including transmit output drivers. This translates to
increased reliability while enabling deployment in todays
power-sensitive applications. Multiple power-down modes,
accessed via configuration pins or registers, allow further
levels of power saving through manual selection or auto-
matic detection of cable energy.
The KS8721BL/SL automatically configures itself for
100Mbps or 10Mbps and full- or half-duplex operation,
using an on-chip auto-negotiation algorithm. Combined
with Auto MDI/MDIX for automatic correction and detec-
tion of crossover and straight-through cables, the
KS8721BL/SL provides an easy-to-use, high performance
solution for 10BASE-T, 100BASE-TX, and 100BASE-FX
applications.
For additional information, contact your local Micrel Field
Application Engineer or salesperson.
Block Diagram
TX+
Transmitter
TX–
10/100
Pulse
Shaper
RX+
RX–
Adaptive EQ
Baseline Wander
Correction
MLT3 Decoder
NRZI/NRZ
10BASE-T
Receiver
XI
PLL
XO
NRZ/NRZI
MLT3 Encoder
Clock
Recovery
Auto
Negotiation
4B/5B Encoder
Scrambler
Parallel/Serial
Parallel/Serial
Manchester Encoder
4B/5B Decoder
Descrambler
Serial/Parallel
Manchester Decoder
Serial/Parallel
MII/RMII
Registers
and
Controller
Interface
TXD3
TXD2
TXD1
TXD0
TXER
TXC
TXEN
CRS
COL
MDIO
MDC
RXD3
RXD2
RXD1
RXD0
RXER
RXDV
RXC
Power-Down/
Power-Saving
PWRDWN
LED
Driver
LINK
COL
FDX
SPD
Micrel Semiconductor TEL: 1.408.944.0800 FAX: 1.408.474.1000 HTTP:// www.micrel.com

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