KSZ9031MNX Datasheet, PDF (1/76 Pages) Micrel Semiconductor – The KSZ9031MNX is a completely integrated triple-speed (10Base-T/100Base-TX/1000Base-T) Ethernet physicallayer transceiver for transmission and reception of data on standard CAT-5 unshielded twisted pair (UTP) cable.

KSZ9031MNX
Gigabit Ethernet Transceiver
with GMII/MII Support
Data Sheet Rev. 1.0
General Description
The KSZ9031MNX is a completely integrated triple-speed
(10Base-T/100Base-TX/1000Base-T) Ethernet physical-
layer transceiver for transmission and reception of data on
standard CAT-5 unshielded twisted pair (UTP) cable.
The KSZ9031MNX offers the industry-standard GMII/MII
(Gigabit Media Independent Interface / Media Independent
Interface) for connection to GMII/MII MACs in Gigabit
Ethernet processors and switches for data transfer at
1000Mbps or 10/100Mbps.
The KSZ9031MNX reduces board cost and simplifies
board layout by using on-chip termination resistors for the
four differential pairs and by integrating an LDO controller
to drive a low-cost MOSFET to supply the 1.2V core.
The KSZ9031MNX offers diagnostic features to facilitate
system bring-up and debugging in production testing and
in product deployment. Parametric NAND tree support
enables fault detection between KSZ9031MNX I/Os and
the board. The LinkMD^® TDR-based cable diagnostic
identifies faulty copper cabling. Remote and local loopback
functions verify analog and digital data paths.
The KSZ9031MNX is available in a 64-pin, lead-free QFN
package (see “Ordering Information”).
Data sheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• Single-chip 10/100/1000Mbps IEEE 802.3 compliant
Ethernet transceiver
• GMII/MII standard interface with 3.3V/2.5V/1.8V tolerant
I/Os
• Auto-negotiation to automatically select the highest link-
up speed (10/100/1000Mbps) and duplex (half/full)
• On-chip termination resistors for the differential pairs
• On-chip LDO controller to support single 3.3V supply
operation – requires only one external FET to generate
1.2V for the core
• Jumbo frame support up to 16KB
• 125MHz reference clock output
• Energy-detect power-down mode for reduced power
consumption when the cable is not attached
• Energy Efficient Ethernet (EEE) support with low-power
idle (LPI) mode and clock stoppage for 100Base-TX/
1000Base-T and transmit amplitude reduction with
10Base-Te option
• Wake-on-LAN (WOL) support with robust custom-packet
detection
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
October 2012
M9999-103112-1.0