KSZ8091RNA Datasheet, PDF (1/67 Pages) Micrel Semiconductor – 10Base-T/100Base-TX Physical Layer Transceiver

KSZ8091RNA/KSZ8091RND
10Base-T/100Base-TX
Physical Layer Transceiver
Revision 1.2
General Description
The KSZ8091RNA 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 KSZ8091RNA is a highly-integrated PHY 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, and by offering a flexible 1.8/2.5/3.3V digital I/O
interface.
The KSZ8091RNA offers the Reduced Media Independent
Interface (RMII) for direct connection with RMII-compliant
Ethernet MAC processors and switches.
As the power-up default, the KSZ8091RNA uses a 25MHz
crystal to generate all required clocks, including the
50MHz RMII reference clock output for the MAC. The
KSZ8091RND takes in the 50MHz RMII reference clock as
the power-up default.
Energy Efficient Ethernet (EEE) provides further power
saving during idle traffic periods and Wake-On-LAN (WOL)
provides a mechanism for the KSZ8091RNA to wake up a
system that is in standby power mode.
The KSZ8091RNA and KSZ8091RND are available in 24-
pin, lead-free QFN packages (see Ordering Information).
Datasheets and support documentation are available on
website at: www.micrel.com.
Features
• Single-chip 10Base-T/100Base-TX IEEE 802.3
compliant Ethernet transceiver
• RMII v1.2 interface support with a 50MHz reference
clock output to MAC, and an option to input a 50MHz
reference clock
• RMII back-to-back mode support for a 100Mbps copper
repeater
• MDC/MDIO management interface for PHY register
configuration
• Programmable interrupt output
• LED outputs for link and activity status indication
• On-chip termination resistors for the differential pairs
• Baseline wander correction
• HP Auto MDI/MDI-X to reliably detect and correct
straight-through and crossover cable connections with
disable and enable option
• Auto-Negotiation to automatically select the highest link-
up speed (10/100Mbps) and duplex (half/full)
• Energy Efficient Ethernet (EEE) support with low-power
idle (LPI) mode for 100Base TX and transmit amplitude
reduction with 10Base-Te option
• Wake-On-LAN (WOL) support with either magic packet,
link status change, or robust custom-packet detection
• LinkMD^® TDR-based cable diagnostics to identify faulty
copper cabling
• HBM ESD rating (6kV)
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
August 31, 2015
Revision 1.2