LAN8741A/LAN8741Ai
Small Footprint MII/RMII 10/100 Energy
Efficient Ethernet Transceiver with HP
Auto-MDIX and flexPWR
®
Technology
PRODUCT FEATURES
Highlights
Datasheet
Key Benefits
Single-Chip Ethernet Physical Layer Transceiver
(PHY)
Compliant with Energy Efficient Ethernet 802.3az
Comprehensive flexPWR
®
technology
— Flexible power management architecture
— LVCMOS Variable I/O voltage range: +1.8 V to +3.3 V
— Integrated 1.2 V regulator with disable feature
High-performance 10/100 Ethernet transceiver
—
—
—
—
—
—
—
—
—
Compliant with IEEE802.3/802.3u (Fast Ethernet)
Compliant with ISO 802-3/IEEE 802.3 (10BASE-T)
Compliant with Energy Efficient Ethernet IEEE 802.3az
Loop-back modes
Auto-negotiation
Automatic polarity detection and correction
Link status change wake-up detection
Vendor specific register functions
Supports both MII and the reduced pin count RMII
interface
Various low power modes
Integrated power-on reset circuit
Two status LED outputs
May be used with a single 3.3 V supply
HP Auto-MDIX support
Small footprint 32-pin SQFN, RoHS-compliant
package (5 x 5 x 0.9 mm height)
Deterministic 100 Mb internal loopback latency
(MII Mode)
Power and I/Os
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—
—
—
Target Applications
Set-Top Boxes
Networked Printers and Servers
Test Instrumentation
LAN on Motherboard
Embedded Telecom Applications
Video Record/Playback Systems
Cable Modems/Routers
DSL Modems/Routers
Digital Video Recorders
IP and Video Phones
Wireless Access Points
Digital Televisions
Digital Media Adaptors/Servers
Gaming Consoles
POE Applications
(Refer to SMSC Application Note 17.18)
Additional Features
— Ability to use a low cost 25 MHz crystal for reduced
BOM
Packaging
— 32-pin SQFN (5 x 5 mm), RoHS-compliant package with
MII and RMII
Environmental
— Commercial temperature range (0°C to +70°C)
— Industrial temperature range (-40°C to +85°C)
SMSC LAN8741A/LAN8741Ai
Revision 1.1 (05-21-13)
DATASHEET
Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR
®
Technology
Datasheet
ORDER NUMBER(S):
LAN8741A-EN (Tray) for 32-pin, SQFN, RoHS-compliant package (0°C to +70°C temp)
LAN8741Ai-EN (Tray) for 32-pin, SQFN, RoHS-compliant package (-40°C to +85°C temp)
LAN8741A-EN-TR (Tape & Reel) for 32-pin, SQFN, RoHS-compliant package (0°C to +70°C temp)
LAN8741Ai-EN-TR (Tape & Reel) for 32-pin, SQFN, RoHS-compliant package (-40 to +85°C temp)
This product meets the halogen maximum concentration values per IEC61249-2-21.
For RoHS compliance and environmental information, please visit
www.smsc.com/rohs.
Please contact your SMSC sales representative for additional documentation related to this product
such as application notes, anomaly sheets, and design guidelines.
Copyright © 2013 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered
trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.
The Microchip name and logo, and the Microchip logo are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE
OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL
DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;
TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD
TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Revision 1.1 (05-21-13)
2
SMSC LAN8741A/LAN8741Ai
DATASHEET
Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR
®
Technology
Datasheet
Table of Contents
Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.1
1.2
General Terms and Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Chapter 2 Pin Description and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1
2.2
Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Buffer Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Chapter 3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.1
Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.1
100BASE-TX Transmit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.2
100BASE-TX Receive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.3
10BASE-T Transmit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.4
10BASE-T Receive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auto-Negotiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1
Parallel Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2
Restarting Auto-Negotiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.3
Disabling Auto-Negotiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.4
Half vs. Full Duplex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HP Auto-MDIX Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAC Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1
MII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.2
RMII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.3
MII vs. RMII Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Management Interface (SMI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interrupt Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.1
Primary Interrupt System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.2
Alternate Interrupt System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Straps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7.1
PHYAD[2:0]: PHY Address Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7.2
MODE[2:0]: Mode Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7.3
RMIISEL: MII/RMII Mode Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7.4
REGOFF: Internal +1.2 V Regulator Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7.5
nINTSEL: nINT/TXER/TXD4 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Miscellaneous Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.1
LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.2
Variable Voltage I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.3
Power-Down Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.4
Energy Efficient Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.5
Isolate Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.6
Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.7
Carrier Sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.8
Collision Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.9
Link Integrity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.10
Loopback Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Application Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.1
Simplified System Level Application Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.2
Power Supply Diagram (1.2 V Supplied by Internal Regulator). . . . . . . . . . . . . . . . . . . .
3
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
20
20
23
26
26
27
29
29
29
29
30
30
31
31
33
34
35
36
37
38
38
39
40
40
41
42
42
43
43
44
45
45
45
46
46
47
49
49
50
SMSC LAN8741A/LAN8741Ai
Revision 1.1 (05-21-13)
DATASHEET
Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR
®
Technology
Datasheet
3.9.3
3.9.4
3.9.5
Power Supply Diagram (1.2 V Supplied by External Source) . . . . . . . . . . . . . . . . . . . . . 51
Twisted-Pair Interface Diagram (Single Power Supply). . . . . . . . . . . . . . . . . . . . . . . . . . 52
Twisted-Pair Interface Diagram (Dual Power Supplies) . . . . . . . . . . . . . . . . . . . . . . . . . 53
Chapter 4 Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.1
4.2
Register Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control and Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1
Basic Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.2
Basic Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.3
PHY Identifier 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.4
PHY Identifier 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.5
Auto Negotiation Advertisement Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.6
Auto Negotiation Link Partner Ability Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.7
Auto Negotiation Expansion Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.8
Auto Negotiation Next Page TX Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.9
Auto Negotiation Next Page RX Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.10 MMD Access Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.11 MMD Access Address/Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.12 EDPD NLP / Crossover Time / EEE Configuration Register . . . . . . . . . . . . . . . . . . . . . .
4.2.13 Mode Control/Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.14 Special Modes Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.15 Symbol Error Counter Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.16 Special Control/Status Indications Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.17 Interrupt Source Flag Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.18 Interrupt Mask Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.19 PHY Special Control/Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MDIO Manageable Device (MMD) Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.1
PCS Control 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.2
PCS Status 1 Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.3
PCS MMD Devices Present 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.4
PCS MMD Devices Present 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.5
EEE Capability Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.6
EEE Wake Error Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.7
Auto-Negotiation MMD Devices Present 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.8
Auto-Negotiation MMD Devices Present 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.9
EEE Advertisement Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.10 EEE Link Partner Advertisement Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.11 Vendor Specific MMD 1 Device ID 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.12 Vendor Specific MMD 1 Device ID 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.13 Vendor Specific 1 MMD Devices Present 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.14 Vendor Specific 1 MMD Devices Present 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.15 Vendor Specific MMD 1 Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.16 Vendor Specific MMD 1 package ID 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.17 Vendor Specific MMD 1 package ID 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
54
55
56
57
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
4.3
Chapter 5 Operational Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
5.1
5.2
5.3
5.4
Absolute Maximum Ratings*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Conditions** . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package Thermal Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.1
Regulator Disabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.2
Regulator Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
95
96
96
97
97
97
Revision 1.1 (05-21-13)
SMSC LAN8741A/LAN8741Ai
DATASHEET
Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR
®
Technology
Datasheet
5.5
5.6
5.7
DC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
5.6.1
Equivalent Test Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
5.6.2
Power-On nRST & Configuration Strap Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
5.6.3
MII Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
5.6.4
RMII Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
5.6.5
SMI Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Clock Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Chapter 6 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Chapter 7 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
SMSC LAN8741A/LAN8741Ai
5
Revision 1.1 (05-21-13)
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