Microchip Technology KSZ9021 Gigabit Ethernet Transceiver

Microchip Technology KSZ9021 Gigabit Ethernet Transceiver is a completely integrated triple-speed (10Base-T/100Base-TX/1000Base-T) Ethernet Physical Layer Transceiver for transmission and reception of data over standard CAT-5 unshielded twisted pair (UTP) cable. The KSZ9021 reduces board cost and simplifies board layout by using on-chip termination resistors for the four differential pairs and by integrating an LDO controller to drive a low-cost MOSFET to supply the 1.2V core.

The KSZ9021 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 KSZ9021 I/Os and the board. The LinkMD® TDR-based cable diagnostics permit the identification of faulty copper cabling. Remote and local loopback functions provide verification of analog and digital data paths.

The KSZ9021GN and KSZ9021GQ variants provide the industry-standard Gigabit Media Independent Interface/Media Independent Interface (GMII/MII) for connection to GMII/MII MACs in Gigabit Ethernet Processors and Switches for data transfer at 1000Mbps or 10/100Mbps speed. The KSZ9021RL and KSZ9021RN variants provide the Reduced Gigabit Media Independent Interface (RGMII).

The KSZ9021RL is available in a 64-pin, lead-free E-LQFP package, and the KSZ9021RN is offered in a smaller 48-pin QFN package. The KSZ9021GN is available in a 64-pin, lead-free QFN package, and the KSZ9021GQ is offered in a 128-pin, lead-free PQFP package.

Features

Single-chip 10/100/1000Mbps IEEE 802.3 compliant Ethernet Transceiver
KSZ9021G features GMII/MII standard-compliant interface
KSZ9021R features RGMII interface compliant to RGMII Version 1.3
GMII/MII/RGMII I/Os with 3.3V/2.5V tolerant and programmable timings to adjust and correct delays on both Tx and Rx paths
Auto-negotiation to automatically select the highest link up speed (10/100/100Mbps) and duplex (half/full)

On-chip termination resistors for the differential pairs
On-chip LDO controller to support single 3.3V supply operation – requires only external FET to generate 1.2V for the core

Jumbo frame support up to 16KB
125MHz Reference Clock Output
Programmable LED outputs for link, activity, and speed
Baseline Wander Correction
LinkMD® TDR-based cable diagnostics for identification of faulty copper cabling
Parametric NAND tree support for fault detection between chip I/Os and board.
Loopback modes for diagnostics
Package options:
- KSZ9021GN: QFN-64
- KSZ9021GQ: PQFP-128
- KSZ9021RL: E-LQFP-64
- KSZ9021RN: QFN-48
RoHS compliant