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PDF KSZ8081RNB Data sheet ( Hoja de datos )
| Número de pieza | KSZ8081RNB | |
| Descripción | 10Base-T/100Base-TX Physical Layer Transceiver | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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KSZ8081MNX/KSZ8081RNB
10Base-T/100Base-TX
Physical Layer Transceiver
Revision 1.4
General Description
The KSZ8081 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 KSZ8081 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.
The KSZ8081MNX offers the Media Independent Interface
(MII) and the KSZ8081RNB offers the Reduced Media
Independent Interface (RMII) for direct connection with
MII/RMII-compliant Ethernet MAC processors and
switches.
A 25MHz crystal is used to generate all required clocks,
including the 50MHz RMII reference clock output for the
KSZ8081RNB.
The KSZ8081 provides diagnostic features to facilitate
system bring-up and debugging in production testing and
in product deployment. Parametric NAND tree support
enables fault detection between KSZ8081 I/Os and the
board. Micrel LinkMD® TDR-based cable diagnostics
identify faulty copper cabling.
The KSZ8081MNX and KSZ8081RNB are available in 32-
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
• MII interface support (KSZ8081MNX)
• RMII v1.2 Interface support with a 50MHz reference
clock output to MAC, and an option to input a 50MHz
reference clock (KSZ8081RNB)
• 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, activity, and speed 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)
• Power-down and power-saving modes
• LinkMD TDR-based cable diagnostics to identify faulty
copper cabling
• Parametric NAND Tree support for fault detection
between chip I/Os and the board
• 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 +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 19, 2015
Revision 1.4
1 page  
Micrel, Inc.
KSZ8081MNX/KSZ8081RNB
NAND Tree Support .............................................................................................................................................................. 35
NAND Tree I/O Testing ..................................................................................................................................................... 36
Power Management .............................................................................................................................................................. 37
Power-Saving Mode .......................................................................................................................................................... 37
Energy-Detect Power-Down Mode .................................................................................................................................... 37
Power-Down Mode ............................................................................................................................................................ 37
Slow-Oscillator Mode......................................................................................................................................................... 37
Reference Circuit for Power and Ground Connections......................................................................................................... 38
Typical Current/Power Consumption .................................................................................................................................... 39
Transceiver (3.3V), Digital I/Os (3.3V) .............................................................................................................................. 39
Transceiver (3.3V), Digital I/Os (2.5V) .............................................................................................................................. 39
Transceiver (3.3V), Digital I/Os (1.8V) .............................................................................................................................. 40
Register Map ......................................................................................................................................................................... 41
Register Description .............................................................................................................................................................. 42
Absolute Maximum Ratings .................................................................................................................................................. 52
Operating Ratings ................................................................................................................................................................. 52
Electrical Characteristics....................................................................................................................................................... 52
Timing Diagrams ................................................................................................................................................................... 54
MII SQE Timing (10Base-T) .............................................................................................................................................. 54
MII Transmit Timing (10Base-T)........................................................................................................................................ 55
MII Receive Timing (10Base-T)......................................................................................................................................... 56
MII Transmit Timing (100Base-TX) ................................................................................................................................... 57
MII Receive Timing (100Base-TX) .................................................................................................................................... 58
RMII Timing ....................................................................................................................................................................... 59
Auto-Negotiation Timing .................................................................................................................................................... 60
MDC/MDIO Timing ............................................................................................................................................................ 61
Power-up/Reset Timing ..................................................................................................................................................... 62
Reset Circuit.......................................................................................................................................................................... 63
Reference Circuits – LED Strap-In Pins................................................................................................................................ 64
Reference Clock – Connection and Selection ...................................................................................................................... 65
Magnetic – Connection and Selection .................................................................................................................................. 66
Package Information and Recommended Land Pattern ....................................................................................................... 68
August 19, 2015
5
Revision 1.4
5 Page 
Micrel, Inc.
KSZ8081MNX/KSZ8081RNB
Pin Description – KSZ8081MNX (Continued)
Pin Number Pin Name
Type(2)
Pin Function
LED Output: Programmable LED0 output.
Config Mode: Latched as auto-negotiation enable (Register 0h, Bit [12]) at the de-
assertion of reset.
See the Strapping Options – KSZ8081MNX section for details.
The LED0 pin is programmable using Register 1Fh bits [5:4], and is defined as
follows:
LED Mode = [00]
Link/Activity
Pin State
LED Definition
LED0/
No link
30 Ipu/O
NWAYEN
Link
High
Low
OFF
ON
Activity
Toggle
Blinking
LED Mode = [01]
Link
Pin State
No link
High
Link Low
LED Definition
OFF
ON
LED Mode = [10], [11] Reserved
LED Output: Programmable LED1 Output.
Config Mode: Latched as Speed (Register 0h, Bit [13]) at the de-assertion of reset.
See the Strapping Options – KSZ8081MNX section for details.
The LED1 pin is programmable using Register 1Fh bits [5:4], and is defined as
follows:
LED Mode = [00]
Speed
Pin State
LED Definition
31
LED1/
Ipu/O
10Base-T
High
SPEED
100Base-TX
Low
OFF
ON
LED Mode = [01]
Activity
Pin State
No activity
High
Activity
Toggle
LED Definition
OFF
Blinking
32
PADDLE
RST#
GND
Ipu
GND
LED Mode = [10], [11]
Chip Reset (active low).
Ground
Reserved
August 19, 2015
11
Revision 1.4
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet KSZ8081RNB.PDF ] | |
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