Gigabit Ethernet Transceiver with 8/8 Driver/Receiver Channels
The KSZ9021RL is a full-duplex Gigabit Ethernet transceiver from Microchip Technology, integrating 8 drivers and 8 receivers in a single 64-LQFP exposed-pad package. Operating from a 3.135V to 3.465V supply, it is compatible with standard 3.3V logic rails and can be powered from a common board voltage without additional regulators.
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Package and Supply Rail Fit
The exposed paddle must be connected to ground plane with multiple vias to keep junction temperature within the datasheet limits during continuous Gigabit Ethernet traffic. Supply decoupling should follow the manufacturer's layout guidelines: place 0.1 µF and 1 µF capacitors close to each supply pin, with the ground return via directly under the pad. The 3.135V to 3.465V range means the part will operate on a 3.3V rail with ±5% tolerance, which covers most regulated supplies.