Catalog
Gigabit Ethernet Transceiver
Key Features
• Single-chip 10/100/1000Mbps IEEE 802.3 compliant Ethernet Transceiver
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• KSZ9021G features GMII/MII standard compliant interface
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• KSZ9021R features RGMII interface compliant to RGMII Version 1.3
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• 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
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• Auto-negotiation to automatically select the highest link up speed (10/100/100Mbps) and duplex (half/full)
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• On-chip termination resistors for the differential pairs
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• On-chip LDO controller to support single 3.3V supply operation – requires only external FET to generate 1.2V for the core
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• Jumbo frame support up to 16KB
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• 125MHz Reference Clock Output
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• Programmable LED outputs for link, activity and speed
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• Baseline Wander Correction
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• LinkMD® TDR-based cable diagnostics for identification of faulty copper cabling
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• Parametric NAND Tree support for fault detection between chip I/Os and board.
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• Loopback modes for diagnostics
Description
AI
The KSZ9021 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 KSZ9021Gxx provides 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 KSZ9021Rxx provides the Reduced Gigabit Media Independent Interface (RGMII).
The KSZ9021 reduces board cost and simplifies board layout by using on-chip termination resistors for the four differential pairs and by integrating a 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 board. LinkMD® TDR-based cable diagnostics permit identification of faulty copper cabling. Remote and local loopback functions provide verification of analog and digital data paths.
The KSZ9021RL is available in a 64-pin, lead-free E-LQFP package, and is offered as the KSZ9021RN in the smaller 48-pin QFN package. The KSZ9021GN is available in a 64-pin, lead-free QFN package and the KSZ9021GQ is available in a 128-pin, lead-free PQFP package.
Microchip's complimentary and confidential [MicroCHECK](https://www.microchip.com/en-us/support/design-help/design-check-services) design review service, which offers insight from the initial concept to the final PCB layout, is available to customers who are using our products in their projects. You can confidently submit your design materials in a secure and private setting, and our expert engineers will provide individualized feedback to enhance your design. MicroCHECK design review service is subject to Microchip's [Program Terms and Conditions](https://www.microchip.com/en-us/support/design-help/design-check-services/design-check-services-program-terms-and-conditions) and requires a myMicrochip account.
