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KSZ8081RNB Dataheets PDF



Part Number KSZ8081RNB
Manufacturers Micrel Semiconductor
Logo Micrel Semiconductor
Description 10Base-T/100Base-TX Physical Layer Transceiver
Datasheet KSZ8081RNB DatasheetKSZ8081RNB Datasheet (PDF)

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 suppl.

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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 32pin, 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 linkup 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 Micrel, Inc. Features (Continued) • Loopback modes for diagnostics • Single 3.3V power supply with VDD I/O options for 1.8V, 2.5V, or 3.3V • Built-in 1.2V regulator for core • Available in 32-pin (5mm × 5mm) QFN package Applications • Game console • IP phone • IP set-top box • IP TV • LOM • Printer KSZ8081MNX/KSZ8081RNB Ordering Information Part Number KSZ8081MNXCA KSZ8081MNXIA(1) Temperature Range 0°C to +70°C −40°C to +85°C Package 32-Pin QFN 32-Pin QFN KSZ8081RNBCA 0°C to +70°C 32-Pin QFN KSZ8081RNBIA(1) −40°C to +85°C 32-Pin QFN KSZ8081MNX-EVAL KSZ8081RNB-EVAL Note: 1. Contact factory for lead time. Lead Finish Pb-Free Pb-Free Pb-Free Pb-Free Description MII, Commercial Temperature. MII, Industrial Temperature. RMII with 25MHz crystal/clock input and 50MHz RMII REF_CLK output (power-up default), Commercial Temperature. RMII with 25MHz crystal/clock input and 50MHz RMII REF_CLK output (power-up default), Industrial Temperature. KSZ8081MNX Evaluation Board (Mounted with KSZ8081MNX device in commercial temperature) KSZ8081RNB Evaluation Board (Mounted with KSZ8081RNB device in commercial temperature) August 19, 2015 2 Revision 1.4 Micrel, Inc. KSZ8081MNX/KSZ8081RNB Revision History Revision 1.0 1.1 1.2 1.3 1.4 Date 11/5/12 2/6/14 12/18/14 04/14/15 08/19/15 Summary of Changes Initial release of datasheet. Removed copper wire bonding part numbers from Ordering Information. Added note for TXC (Pin 22) and Register 16h, Bit [15] regarding a Reserved Factory Mode for KSZ8081MNX device. Corrected TXC (Pin 22) pin type for KSZ8081MNX device. Removed TXC and RXC clock connections for MII Back-to-Back mode. This is a datasheet correction. There is no change to the silicon. Added series resistance and load capacitance for the crystal selection criteria. Added silver wire bonding part numbers to Ordering Information. Updated Ordering Information to include Ordering Part Number and Device Marking. Updated Table 7, add a note for Table 7. Updated Table 8, updated NAND tree I/O testing descriptions. Add Max frequency for MDC in MII Management (MIIM) Interface section. Updated Table 23, add a note for Table 23. Updated Figure 22 and Figure 22 descriptions. Updated descriptions under Figure 23 for LED strap pins, add a note for Figure 23. Fixed the missing value for maximum junction and thermal resistance (θJC). Updated descriptions in local loopback section .


KSZ8081MNX KSZ8081RNB A1304


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