10Base-T/100Base-TX Physical Layer Transceiver
Description
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
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