Datasheet

 2016-2017 Microchip Technology Inc. DS00002117F-page 4
KSZ9031RNX
1.0 INTRODUCTION
1.1 General Description
The KSZ9031RNX 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 KSZ9031RNX provides the Reduced Gigabit Media Independent Interface (RGMII) for direct connection to RGMII
MACs in Gigabit Ethernet processors and switches for data transfer at 10/100/1000 Mbps.
The KSZ9031RNX 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 KSZ9031RNX 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 KSZ9031 I/Os and the board. The
LinkMD
®
TDR-based cable diagnostic identifies faulty copper cabling. Remote and local loopback functions verify ana-
log and digital data paths.
The standard KSZ9031RNX is available in a 48-pin, lead-free QFN package, and the AEC-Q100 automotive qualified
parts, KSZ9031RNXUA/UB and KSZ9031RNXVA/VB, are available in a 48-pin lead-free VQFN (wettable) package.
FIGURE 1-1: SYSTEM BLOCK DIAGRAM
RGMII
10/100/1000Mbps
RGMII
ETHERNET MAC
MDC/MDIO
MANAGEMENT
KSZ9031RNX
LDO
CONTROLLER
ON-CHIP TERMINATION
RESISTORS
VIN
3.3VA
VOUT
1.2V (FOR CORE VOLTAGES)
MAGNETICS
RJ-45
CONNECTOR
MEDIA TYPES
10Base-T
100Base-TX
1000Base-T
(SYSTEM POWER CIRCUIT)
PME_N