KSZ8081RNB

Part: Micrel KSZ8081MNX/KSZ8081RNB

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

Key Specs:

• Single power supply: 3.3V
• Core voltage: 1.2V
• I/O voltage options: 1.8V, 2.5V, 3.3V
• Crystal frequency: 25MHz
• RMII reference clock output: 50MHz
• HBM ESD rating: 6kV
• Data rates: 10/100Mbps

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)
• 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 × 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
• HBM ESD rating (6kV)

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

32-Pin 5mm × 5mm QFN

Pin Description – KSZ8081MNX

2. P = Power supply.

GND = Ground.

I = Input.

O = Output.

I/O = Bi-directional.

Ipu = Input with internal pull-up (see Electrical Characteristics for value).

Ipu/O = Input with internal pull-up (see Electrical Characteristics for value) during power-up/reset; output pin otherwise.

Ipd/O = Input with internal pull-down (see Electrical Characteristics for value) during power-up/reset; output pin otherwise.

Ipu/Opu = Input with internal pull-up (see Electrical Characteristics for value) and output with internal pull-up (see Electrical Characteristics for value).

3. MII RX Mode: The RXD[3:0] bits are synchronous with RXC. When RXDV is asserted, RXD[3:0] presents valid data to the MAC. RXD[3:0] is invalid data from the PHY when RXDV is de-asserted.

Notes:

11. Exceeding the absolute maximum ratings 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.

12. The device is not guaranteed to function outside its operating ratings.

13. TA = 25°C. Specification for packaged product only.

14. 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.

Supply Voltage (VIN)

• (VDDIO, VDDA_3.3) –0.5V to +5.0V
• Input Voltage (all inputs) –0.5V to +5.0V
• Output Voltage (all outputs) –0.5V to +5.0V
• Lead Temperature (soldering, 10s) 260°C
• Storage Temperature (TS)–55°C to +150°C