KSZ8021RNL - 10/100 Ethernet PHY RMII | Microchip
MPN: KSZ8021RNL ✓ NakahandaKSZ8021RNL Ulas
An Ethernet PHY is a semiconductor that converts logical data transmitted by a Media Access Controller into electrical signals suitable for copper cabling, while recovering incoming signals and forwarding recovered data to the MAC. In the product hierarchy, the KSZ8021RNL is an Ethernet transceiver, an interface IC, a physical-layer device, and a network-connectivity semiconductor. Its RMII interface reduces the number of parallel data connections required between the PHY and the host processor compared with older parallel Ethernet interfaces.
The manufacturer datasheet identifies the KSZ8021RNL as the variant that accepts a 50 MHz RMII reference clock. It also describes support for status and control registers and an interrupt pin that eliminates the need for the processor to poll PHY output continuously. The 24-QFN exposed-pad construction supports compact Ethernet designs by providing a solderable thermal and electrical connection beneath the package while allowing the board to remove heat through its copper area.
The KSZ8021RNL supports both 10Base-T and 100Base-TX operation, allowing a system to use a common physical-layer device for 10 Mbps legacy Ethernet and 100 Mbps Fast Ethernet links. Compatibility with standard CAT-5 unshielded twisted pair makes it applicable to embedded controllers, industrial equipment, access equipment, printers, set-top boxes, and embedded Ethernet systems that use an RMII-capable host processor.
Typical implementations place the PHY close to the RJ45 connector and route the differential twisted-pair pairs with controlled geometry. The MAC supplies transmit data and timing signals over RMII, while the PHY translates those signals for the cable. Received data, carrier status, collision information, and interrupt indications are returned to the host through the interface. System firmware then handles link negotiation, autonegotiation, and network-stack configuration.
A critical layout consideration is maintaining a continuous ground reference beneath the differential pairs and avoiding splits in the ground plane. The exposed pad should be connected to ground and thermal copper using the manufacturer’s land-pattern guidance. Input and interface traces also require careful return-path planning because the RMII clock and data signals operate at a relatively high digital rate relative to the 10/100 Ethernet data payload.
This page combines the manufacturer datasheet, verified distributor identification, package information, and the manufacturer’s hardware-migration guidance. It also distinguishes a genuine same-family drop-in option from newer PHY families whose pin assignments differ, helping engineers avoid replacements that require board changes or interface redesign.
Mga alternatibo na pwedeng ilagay na KSZ8021RNL — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok KSZ8021RNL (parehas na form factor at footprint) — pagkakaiba sa Ethernet Speed Support, Media Interface, Package, Product Type, RMII Reference Clock.
KSZ8031RNL
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →KSZ8021RNL Mga Spesipikasyon
| Product Type | 10Base-T/100Base-TX Ethernet physical-layer transceiver |
| Ethernet Speed Support | 10 Mbps and 100 Mbps |
| Physical Layer Standards | 10Base-T and 100Base-TX |
| Media Interface | Reduced Media Independent Interface (RMII) |
| RMII Reference Clock | 50 MHz |
| Supply Configuration | Single supply |
| Cable Type | CAT-5 unshielded twisted pair (UTP) |
| Packhaging | 24-QFN with exposed pad, 4 mm x 4 mm |
| Uri ng Pagpapasok | Surface mount |
| Interrupt Support | Dedicated interrupt pin |
| Control Interface | PHY status and control registers |
| Polling Requirement | Processor polling not required when interrupt is used |
| Maximum Link Rate | 100 Mbps |
Gabay sa Pin Configuration ng KSZ8021RNL 24-qfn with exposed pad, 4 mm x 4 mm
Pin configuration para sa KSZ8021RNL (24-qfn with exposed pad, 4 mm x 4 mm package). Ang pagnunumero ng pin, mga function, at connection diagram ay tinukoy sa datasheet ng manufacturer. Sumangguni dito para sa eksaktong footprint at mga alituntunin sa soldering.
Wala ng detalyadong pinout data na magagamit para sa KSZ8021RNL.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
KSZ8021RNL ay nararapat para sa 6 aplikasyons: Embedded Ethernet Controller, Industrial Equipment Network Port, Network Switch Port, USB-to-Ethernet Adapter, Set-Top Box and Media Terminal, IoT Gateway with Copper Ethernet.
Embedded Ethernet Controller
The KSZ8021RNL suits an embedded processor that exposes an RMII interface and needs 10/100 Ethernet connectivity. It supports 10Base-T and 100Base-TX operation over CAT-5 UTP, accepts the 50 MHz RMII reference-clock arrangement identified for this version, and provides an interrupt pin so the host can respond to PHY status without continuous register polling. The 24-QFN exposed-pad package keeps the circuit compact while the MAC handles framing, protocol processing, and the network stack.
Inirekomenda
Industrial Equipment Network Port
The KSZ8021RNL is appropriate for industrial controllers, condition-monitoring equipment, and automation modules requiring a compact 10/100 Ethernet physical layer. Its single-supply 10Base-T/100Base-TX PHY connects an RMII-capable host to standard CAT-5 UTP, while the interrupt output reduces the need for continuous status polling. For field deployment, verify the operating-temperature range, supply limits, isolation strategy, and surge-protection requirements in the manufacturer datasheet before releasing the design.
Inirekomenda
Network Switch Port
The KSZ8021RNL can provide the copper PHY layer for a 10/100 switch port controlled by an RMII-compatible switching or routing processor. It supports both 10 Mbps and 100 Mbps operation, and its interrupt pin allows link-state changes to be handled without continuously polling the PHY. Layout the device near the connector-side magnetics, preserve a continuous ground reference below each differential pair, and follow the manufacturer land pattern for the exposed thermal pad.
Inirekomenda
USB-to-Ethernet Adapter
The KSZ8021RNL can serve as the 10/100 Ethernet PHY in a USB-to-Ethernet adapter that uses an RMII-capable controller. The PHY translates the controller’s RMII data into 10Base-T or 100Base-TX signals for CAT-5 UTP cabling, while its 50 MHz RMII reference-clock arrangement matches the KSZ8021RNL definition. The 4 mm by 4 mm QFN package supports compact dongles, and the interrupt pin can signal link events to the adapter firmware.
Inirekomenda
Set-Top Box and Media Terminal
The KSZ8021RNL supports network connectivity in set-top boxes, media terminals, and other compact consumer or commercial products with an RMII-capable host processor. Its 10/100 Ethernet capability provides compatibility with legacy 10 Mbps networks as well as 100 Mbps Fast Ethernet networks. The compact QFN footprint helps conserve board area, but designers should still allocate adequate exposed-pad copper and use short, properly referenced RMII clock and data routes.
Inirekomenda
IoT Gateway with Copper Ethernet
The KSZ8021RNL can add wired Ethernet to an IoT gateway or supervisory controller that already uses an RMII interface. Supporting 10Base-T and 100Base-TX lets the gateway communicate with plant, building, or access networks over CAT-5 UTP, while the interrupt pin supports event-driven link handling. Validate cable reach, magnetics selection, isolation, and thermal performance under the system enclosure conditions because connector and environmental requirements are outside the PHY package itself.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for KSZ8021RNL — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | KSZ8031RNL |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 24-QFN with exposed pad (4x4 mm) | 24-QFN with exposed pad (4x4 mm) |
| Product Type | 10Base-T/100Base-TX Ethernet PHY | 10Base-T/100Base-TX Ethernet PHY |
| Supported Speeds | 10 Mbps and 100 Mbps | 10 Mbps and 100 Mbps |
| Host Interface | RMII | RMII |
| Clock Configuration | 50 MHz RMII reference-clock version | Different RMII clock implementation |
| Supply Architecture | Single supply | Single supply |
| Interrupt Support | Interrupt pin | Interrupt pin |
| Cable Medium | CAT-5 UTP | CAT-5 UTP |
Pangunahing mga Pagkakaiba
- Specific 50 MHz RMII clock arrangement (kumpara saKSZ8031RNL)
- Shared 10/100 Ethernet PHY functionality (kumpara saKSZ8031RNL)
- Avoiding invalid newer-family substitutions (kumpara saKSZ8081RNL)
Talaan ng Disenyo
Place the KSZ8021RNL close to the RJ45 connector and its integrated magnetics. Route each 10/100 Ethernet differential pair as a tightly coupled pair over a continuous ground plane, avoid plane splits beneath the traces, and keep unrelated switching circuitry away from the cable-side section. The manufacturer package drawing and layout guidance should govern pad dimensions, exposed-pad connection, and trace geometry.
Treat the 50 MHz RMII reference clock as a high-speed clock even though the Ethernet payload rate is 100 Mbps. Route it from a low-noise source over a continuous reference plane, minimize stubs and unnecessary vias, and maintain spacing from Ethernet magnetics and switching nodes. Confirm source, load, and timing requirements against the shared KSZ8021RNL/KSZ8031RNL manufacturer datasheet.
Connect the 24-QFN exposed pad to the ground plane with the maximum practical copper area while following the manufacturer land pattern. Do not place the PHY on a copper-starved corner of the PCB. Actual junction temperature depends on ambient temperature, airflow, copper area, and board construction, so calculate thermal margin using the package thermal information and the enclosure’s actual heat-transfer conditions.
Do not substitute KSZ8031RNL solely because it uses the same package family. The manufacturer identifies KSZ8021RNL as the version that takes the 50 MHz RMII reference clock, so the alternative may require clock, strap, or firmware changes. Likewise, KSZ8081 and KSZ8091 are not automatic drop-ins because the manufacturer migration document identifies hardware pin differences.
Impormasyon ng Pagsunod sa Kautusan
The accessible manufacturer and distributor records do not explicitly state the requested compliance statuses. No qualification claims are inferred from the Ethernet or industrial application.
