Skip to main content

We use cookies to understand how you use our site and improve your experience. See our Privacy Policy.

KSZ8081RNB-EVAL

Physical Layer Transceiver

The KSZ8081RNB-EVAL is a physical layer transceiver from Microchip Technology. View the full KSZ8081RNB-EVAL datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

KSZ8081RNB-EVAL shares its datasheet with KSZ8081, whose page lists every part number it covers.

Official KSZ8081RNB-EVAL datasheet (PDF) — the source this page was extracted from.

Manufacturer

Microchip Technology

Category

Interface ICs

Package

QFN-32

KSZ8081RNB-EVAL Key Specifications

ParameterValue
StandardIEEE 802.3 10Base-T/100Base-TX
Package Size5mm x 5mm 32-pin QFN
MAC InterfaceRMII v1.2 (KSZ8081RNB)
Core RegulatorIntegrated 1.2V
Supply Voltage3.3V single supply
Auto-Negotiation10/100Mbps, half/full duplex, HP Auto MDI/MDI-X
Cable DiagnosticsLinkMD TDR-based
I/O Voltage Options1.8V, 2.5V, or 3.3V
Management InterfaceMDC/MDIO
RMII Reference Clock50MHz output (default) or input option
Operating Temperature0°C to 70°C
Reference Clock Input25MHz crystal/clock, ±50ppm

KSZ8081RNB-EVAL Overview

Part: KSZ8081 — Micrel Inc.

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

Description: A single-supply 10Base-T/100Base-TX Ethernet physical-layer transceiver for data transmission and reception over standard CAT-5 UTP cable, featuring on-chip termination resistors, an integrated 1.2V regulator, and LinkMD TDR-based cable diagnostics.

Operating Conditions:

  • Supply voltage: 3.3V (VDD I/O options for 1.8V, 2.5V, or 3.3V)
  • Operating temperature: -40°C to +85°C
  • Clock input: 25MHz crystal

Features:

  • Single-chip 10Base-T/100Base-TX IEEE 802.3 compliant Ethernet transceiver
  • MII (KSZ8081MNX) and RMII v1.2 (KSZ8081RNB) interface support
  • HP Auto MDI/MDI-X to reliably detect and correct straight-through and crossover cable connections
  • Auto-negotiation to automatically select the highest linkup speed (10/100Mbps) and duplex (half/full)
  • LinkMD TDR-based cable diagnostics to identify faulty copper cabling
  • Built-in 1.2V regulator for core

Applications:

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

Package:

  • 32-pin (5mm × 5mm) QFN package

KSZ8081RNB-EVAL 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)

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

KSZ8081RNB-EVAL Applications

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

KSZ8081RNB-EVAL Pin Configuration

32-Pin 5mm × 5mm QFN

KSZ8081RNB-EVAL Electrical Characteristics

SymbolParameterConditionMin.Typ.Max.Units
Supply Current (V DDIO , V DDA_3.3 = 3.3V) (14)Supply Current (V DDIO , V DDA_3.3 = 3.3V) (14)Supply Current (V DDIO , V DDA_3.3 = 3.3V) (14)Supply Current (V DDIO , V DDA_3.3 = 3.3V) (14)Supply Current (V DDIO , V DDA_3.3 = 3.3V) (14)Supply Current (V DDIO , V DDA_3.3 = 3.3V) (14)Supply Current (V DDIO , V DDA_3.3 = 3.3V) (14)
I DD1_3.3V10Base-TFull-duplex traffic @100% utilization41mA
I DD2_3.3V100Base-TXFull-duplex traffic @100% utilization47mA
I DD3_3.3VEDPD ModeEthernet cable disconnected (reg. 18h.11 = 0)20mA
I DD4_3.3VPower-Down ModeSoftware power-down (reg. 0h.11 = 1)4mA
CMOS Level InputsCMOS Level InputsCMOS Level InputsCMOS Level InputsCMOS Level InputsCMOS Level InputsCMOS Level Inputs
V IHInput High VoltageV DDIO = 3.3V2.0V
V IHInput High VoltageV DDIO = 2.5V1.8V
V IHInput High VoltageV DDIO = 1.8V1.3V
V ILInput Low VoltageV DDIO = 3.3V0.8
V ILInput Low VoltageV DDIO = 2.5V0.7V
V ILInput Low VoltageV DDIO = 1.8V0.5
\I IN \Input CurrentV IN = GND ~ VDDIO
CMOS Level OutputsCMOS Level OutputsCMOS Level OutputsCMOS Level OutputsCMOS Level OutputsCMOS Level OutputsCMOS Level Outputs
V OHOutput High VoltageV DDIO = 3.3V2.4V
V OHOutput High VoltageV DDIO = 2.5V2.0V
V OHOutput High VoltageV DDIO = 1.8V1.5V
V OLOutput Low VoltageV DDIO = 3.3V0.4V
V OLOutput Low VoltageV DDIO = 2.5V0.4V
V OLOutput Low VoltageV DDIO = 1.8V0.3V
\I oz \Output Tri-State Leakage
LED OutputLED OutputLED OutputLED OutputLED OutputLED OutputLED Output
I LEDOutput Drive CurrentEach LED pin (LED0, LED1)8mA

KSZ8081RNB-EVAL Absolute Maximum Ratings

  • (V DD_1.2 ) .................................................. -0.5V to +1.8V
  • (V DDIO , V DDA_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 (T S ).........................-55°C to +150°C

KSZ8081RNB-EVAL Package Information

Table 26. Compatible Single-Port 10/100 Magnetics

  1. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.

32-Pin 5mm × 5mm QFN

32-Pin 5mm × 5mm QFN

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part NumberManufacturerPackage
KSZ8081Microchip TechnologyVQFN-32 5x5mm
KSZ8081MNXMicrochip TechnologyQFN-32 5x5mm
KSZ8081MNX-EVALMicrochip Technology32-Pin QFN
KSZ8081MNX/RNBMicrochip TechnologyQFN-32 5x5mm
KSZ8081MNXCAMicrochip Technology32-VFQFN Exposed Pad
KSZ8081MNXIAMicrochip Technology32-Pin QFN
KSZ8081RNBMicrochip Technology32-Pin QFN
KSZ8081RNBCAMicrochip Technology32-Pin QFN
KSZ8081RNBIAMicrochip Technology32-Pin QFN

Other Interface ICs

  • TCA6424ARGJR – Texas Instruments, I2C and SMBus I/O Expander
  • BQ25895 – Texas Instruments, I2C Controlled Single Cell 5-A Fast Charger with MaxChargeTM for High Input Voltage and Adjustable Voltage 3.1-A Boost Operation
  • CH340N – WCH, USB to Serial Bridge IC
  • SE050C2HQ1/Z01SDZ – NXP Semiconductors, IoT Secure Element
  • ADM3053BRWZ – Analog Devices, Signal and Power Isolated CAN Transceiver
  • ADM3053BRWZ-REEL7 – Analog Devices, Signal and Power Isolated CAN Transceiver
  • BQ25895RTWR.A – Texas Instruments, I2C Controlled Single Cell 5-A Fast Charger with MaxChargeTM for High Input Voltage and Adjustable Voltage 3.1-A Boost Operation
  • CH334 – WCH, 4-Port USB 2.0 Hub Controller

All Interface ICs datasheetsAll Microchip Technology datasheets (600)

Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.

Ask your AI agent about the KSZ8081RNB-EVAL

Connect SheetsData to Claude, Cursor, Codex or any MCP client and your agent reads this datasheet for you: pinout, limits, register maps and design checks, with the numbers taken from the PDF.

claude mcp add --transport http sheetsdata https://mcp.sheetsdata.com/mcp

Then ask: "Can the KSZ8081RNB-EVAL run from my 12 V rail? Check it against the datasheet limits."

Create a free account $2 of usage every month, no card needed.