• RMII Interface Support with 25-MHz Crystal/Clock
Input and 50-MHz Reference Clock Output to
MAC (KSZ8041RNL Only)
• MIIM (MDC/MDIO) Management Bus to 6.25 MHz
for Rapid PHY Register Configuration
• Interrupt Pin Option
• Programmable LED Outputs for Link, Activity
and Speed
• ESD Rating (6 kV)
• Single Power Supply (3.3V)
• Built-in 1.8V Regulator for Core
• Available In 32-pin 5 mm × 5 mm QFN Package
Target Applications
•
•
•
•
•
•
Printer
LOM
Game Console
IPTV
IP Phone
IP Set-Top Box
DS00002245B-page 1
2017 Microchip Technology Inc.
KSZ8041NL/RNL
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via
E-mail at
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We welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-
rent devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the
revision of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site;
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• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include -literature number) you are
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DS00002245B-page 2
2017 Microchip Technology Inc.
KSZ8041NL/RNL
Table of Contents
1.0 General Description ........................................................................................................................................................................ 4
2.0 Pin Description and Configuration .................................................................................................................................................. 6
8.0 Selection of Isolation Transformer ................................................................................................................................................ 50
9.0 Selection of Reference Crystal ..................................................................................................................................................... 51
10.0 Package Outline & Recommended Land Pattern ....................................................................................................................... 52
Appendix A: Data Sheet Revision History ........................................................................................................................................... 53
The Microchip Web Site ...................................................................................................................................................................... 54
Customer Change Notification Service ............................................................................................................................................... 54
Customer Support ............................................................................................................................................................................... 54
Product Identification System ............................................................................................................................................................. 55
2017 Microchip Technology Inc.
DS00002245B-page 3
KSZ8041NL/RNL
1.0
GENERAL DESCRIPTION
The KSZ8041NL is a single supply 10BASE-T/100BASE-TX physical layer transceiver, which provides
MII/RMII interfaces to transmit and receive data. A unique mixed-signal design extends signaling distance
while reducing power consumption.
HP Auto MDI/MDI-X provides the most robust solution for eliminating the need to differentiate between
crossover and straight-through cables.
The KSZ8041NL represents a new level of features and performance and is an ideal choice of physical layer
transceiver for 10BASE-T/100BASE-TX applications.
The KSZ8041RNL is an enhanced Reduced Media Independent Interface (RMII) version of the
KSZ8041NL that does not require a 50-MHz system clock. It uses a 25-MHz crystal for its input reference
clock and outputs a 50-MHz RMII reference clock to the media access control (MAC).
The KSZ8041NL and KSZ8041RNL are available in 32-pin, lead-free QFN packages (see
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