KSZ8051MNL Datasheet, PDF (1/59 Pages) Micrel Semiconductor – 10Base-T/100Base-TX Physical Layer Transceiver

KSZ8051MNL/RNL
10Base-T/100Base-TX
Physical Layer Transceiver
General Description
Features
The KSZ8051 is a single supply 10Base-T/100Base-TX
Ethernet physical layer transceiver for transmission and
reception of data over standard CAT-5 unshielded twisted
pair (UTP) cable.
The KSZ8051 is a highly integrated, compact solution. It
reduces board cost and simplifies board layout by using
on-chip termination resistors for the differential pairs and
by integrating a low noise regulator to supply the 1.2V
core.
The KSZ8051MNL offers the Media Independent Interface
(MII) and the KSZ8051RNL offers the Reduced Media
Independent Interface (RMII) for direct connection with MII/
RMII compliant Ethernet MAC processors and switches.
• Single-chip 10Base-T/100Base-TX IEEE 802.3
compliant Ethernet Transceiver
• MII Interface support (KSZ8051MNL)
• RMII v1.2 Interface support with 50MHz reference clock
output to MAC, and option to input 50MHz reference
clock (KSZ8051RNL)
• Back-to-Back mode support for 100Mbps copper
repeater or media converter
• MDC/MDIO Management Interface for PHY register
configuration
• Programmable interrupt output
• LED outputs for link, activity and speed status indication
A 25MHz crystal is used to generate all required clocks,
including the 50MHz RMII reference clock output for the
KSZ8051RNL.
The KSZ8051 provides diagnostic features to facilitate
system bring-up and debugging in production testing and
in product deployment. Parametric NAND tree support
enables fault detection between KSZ8051 I/Os and board.
Micrel LinkMD^® TDR-based cable diagnostics permit
identification of faulty copper cabling.
The KSZ8051MNL and KSZ8051RNL are available in 32-
pin, lead-free QFN packages (See Ordering Information).
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• On-chip termination resistors for the differential pairs
• Baseline Wander Correction
• HP Auto MDI/MDI-X for reliable detection and
correction for straight-through and crossover cables
with disable and enable option
• Auto-negotiation to automatically select the highest link
up speed (10/100 Mbps) and duplex (half/full)
• Power down and power saving modes
• LinkMD^® TDR-based cable diagnostics for identification
of faulty copper cabling
• Parametric NAND Tree support for fault detection
between chip I/Os and board.
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Functional Diagram
LinkMD is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
July 2010
M9999-070910-1.0