KSZ8081MNX/RNB28

Part: KSZ8081MNX/KSZ8081RNB, Micrel, Inc.

Type: 10Base-T/100Base-TX Physical Layer Transceiver

Description: The KSZ8081 is a single-supply 10Base-T/100Base-TX Ethernet physical-layer transceiver offering MII or RMII interfaces, integrated 1.2V core regulator, on-chip termination resistors, and LinkMD TDR-based cable diagnostics.

Operating Conditions:

• Supply voltage: Single 3.3V (core), 1.8V/2.5V/3.3V (VDD I/O options)
• Operating temperature: 0°C to 85°C (commercial and industrial ranges combined)
• Reference clock input: 25MHz crystal/oscillator (or 50MHz oscillator for RMII mode)

Absolute Maximum Ratings:

• Max supply voltage: null
• Max continuous current: null
• Max junction/storage temperature: null

Key Specs:

• Data rates: 10Base-T and 100Base-TX
• Interface options: MII (KSZ8081MNX) or RMII v1.2 (KSZ8081RNB)
• Integrated 1.2V regulator for core supply
• On-chip termination resistors for differential pairs
• HP Auto MDI/MDI-X support
• Auto-negotiation for 10/100Mbps speed and half/full duplex
• LinkMD TDR-based cable diagnostics
• MDC/MDIO management interface

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
• 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

Applications:

• Game console
• IP phone
• IP set-top box
• IP TV
• LOM
• Printer

Package:

• 32-pin QFN (5mm x 5mm)

• 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

• Game console
• IP phone
• IP set-top box
• IP TV
• LOM
• Printer

32-Pin (5mm x 5mm) QFN

November 2012 8 M9999-110512-1.0

Notes:

• 1. Exceeding the absolute maximum rating can damage the device. Stresses greater than the absolute maximum rating can cause permanent damage to the device. Operation of the device at these or any other conditions above those specified in the operating sections of this specification is not implied. Maximum conditions for extended periods may affect reliability.
• 1. The device is not guaranteed to function outside its operating rating.
• 1. TA = 25°C. Specification is for packaged product only.
• 1. Current consumption is for the single 3.3V supply KSZ8081MNX/RNB device only, and includes the transmit driver current and the 1.2V supply voltage (VDD_1.2) that are supplied by the KSZ8081MNX/RNB.

November 2012 48 M9999-110512-1.0

Figure 27. Recommended Land Pattern, 32-Pin (5mm x 5mm) QFN

Red circles indicate thermal vias. They should be 0.350mm in diameter and be connected to the GND plane for maximum thermal performance.

Green rectangles (with shaded area) indicate solder stencil openings on the exposed pad area. They should be 0.87 x 0.87mm in size, 1.07mm pitch.

November 2012 64 M9999-110512-1.0