KSZ9131MNXI - Gigabit Ethernet Transceiver | Microchip
N.º da peça: KSZ9131MNXI ✓ AtivoKSZ9131MNXI Visão geral
An Ethernet transceiver converts between a digital media-access-control interface and differential Ethernet signals. It belongs to the hierarchy of Ethernet interface controllers, physical-layer transceivers, interface ICs, and semiconductors. By integrating the digital interface, analog transmit and receive functions, clocking, and termination functions in one device, the KSZ9131MNXI can simplify the physical layer of an Ethernet equipment design.
The principal features include support for GMII, MII, and RGMII host interfaces, automatic speed and duplex negotiation, integrated termination resistors for differential pairs, and an on-chip LDO controller. The LDO controller supports operation from a single 3.3 V supply while requiring one external FET to generate the internal core supply. Voltage-tolerant I/O operation allows the host-facing interface to use 3.3 V, 2.5 V, or 1.8 V signal levels according to the system design.
The KSZ9131 family supports both RGMII and reduced-pin interface arrangements through its configuration strap inputs. After power-up or reset, the device enters RGMII operation when the MODE[3:0] straps select an RGMII-capable configuration. This configurability allows one transceiver family to support multiple Ethernet equipment architectures, although the selected interface determines the host-side timing, pin connections, and external circuitry required by the design.
Typical uses include industrial Ethernet gateways, network switches, routers, set-top equipment, test instruments, and embedded network-access controllers. The 10/100/1000 Mbps capability makes the device appropriate for links that may negotiate down to 100 Mbps or 10 Mbps when the connected equipment or cable configuration does not support gigabit operation. The integrated termination resistors also reduce the number of external components required around the differential Ethernet pairs.
Hardware implementation requires careful treatment of power integrity and signal integrity. The variable DVDDH supply should be connected to the selected 3.3 V, 2.5 V, or 1.8 V I/O rail, with a bulk capacitor near the supply source to limit startup droop. Decoupling capacitors should be positioned as close as practical to the device pins to suppress high-frequency noise and reduce susceptibility to EMI coupling.
This product summary combines the manufacturer interface capabilities, package information, configuration details, and hardware implementation guidance into a design-focused reference. It also provides application context, drop-in candidate evaluation, and practical PCB guidance for engineers developing 10/100/1000 Mbps Ethernet equipment.
Alternativas drop-in para KSZ9131MNXI — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
KSZ9131MNX
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
KSZ9131MNXI Especificações
| Product Type | Single-chip Gigabit Ethernet transceiver |
| Ethernet Standards Compliance | IEEE 802.3 compliant |
| Supported Data Rates | 10 Mbps, 100 Mbps, and 1000 Mbps |
| Host Interface Support | GMII, MII, and RGMII |
| I/O Voltage Tolerance | 3.3 V, 2.5 V, and 1.8 V |
| Auto-Negotiation | Automatic speed and duplex selection |
| Integrated Termination | On-chip termination resistors for differential pairs |
| Core Supply Architecture | On-chip LDO controller with one external FET |
| Single-Supply Operation | 3.3 V |
| Configuration Interface | MODE[3:0] strap inputs |
| Default Configuration | RGMII mode when MODE[3:0] selects an RGMII option |
| Package Type | 64-pin QFN |
| Package Dimensions | 8 mm x 8 mm |
| Tipo de montagem | Surface mount |
| Status RoHS | RoHS compliant |
| Variable I/O Supply Pin | DVDDH, pins 18, 30, 40, and 46 |
| Analog Supply Connection | DVDDH supply connected to +3.3 V, +2.5 V, or +1.8 V |
| Supply Bypass Requirement | Bulk and high-frequency decoupling capacitors |
| Maximum Ethernet Link Rate | 1000 Mbps |
Guia de Configuração de Pinos do KSZ9131MNXI 8 mm x 8 mm
Configuração de pinos para KSZ9131MNXI (pacote 8 mm x 8 mm). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para KSZ9131MNXI.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
KSZ9131MNXI é adequado para 6 aplicaçãos: Industrial Ethernet Gateway, Managed Network Switch, Router and Network Appliance, Set-Top and Media Equipment, Test and Measurement Instrument, Embedded Network Access Controller.
Industrial Ethernet Gateway
The KSZ9131MNXI fits an industrial Ethernet gateway that must connect a processor or controller to a copper network. Its 10/100/1000 Mbps support allows the link to negotiate the highest speed available from the connected equipment, while GMII, MII, and RGMII interfaces provide flexibility for different host architectures. According to the Microchip manufacturer product page, automatic negotiation handles speed and duplex selection, integrated termination reduces external parts around the differential pairs, and the single 3.3 V supply arrangement simplifies system power planning. For deployment in an industrial enclosure, designers should also verify the exact temperature grade and qualification requirements of the selected ordering suffix.
Recomendado
Managed Network Switch
The KSZ9131MNXI is suitable for a managed 10/100/1000 Mbps copper switch port requiring a flexible host interface. According to the Microchip manufacturer datasheet, the transceiver supports GMII, MII, and RGMII, allowing a switch ASIC to be paired using the interface most appropriate for its timing and pin resources. Automatic negotiation simplifies link establishment, while on-chip termination for the differential pairs reduces the external resistor count. The design should reserve continuous return paths beneath the Ethernet pairs and maintain separation from switching nodes and high-current power circuitry. Exact timing margins, isolation, and operating-temperature requirements remain design-specific.
Recomendado
Router and Network Appliance
A router or network appliance can use the KSZ9131MNXI to provide a copper Ethernet port supporting 10, 100, and 1000 Mbps operation. According to the Microchip manufacturer product page, automatic negotiation selects the highest common link speed and duplex mode, which supports compatibility with clients using different Ethernet rates. RGMII operation is useful when the host requires a compact parallel interface, while GMII and MII provide alternatives for other controller architectures. Because a linear regulator dissipates power as voltage and current differ, the design should confirm that the external FET and internal supply architecture meet thermal and efficiency requirements before release.
Recomendado
Set-Top and Media Equipment
The KSZ9131MNXI can provide network connectivity in set-top boxes, media endpoints, and other client equipment that needs one physical-layer device for multiple Ethernet rates. According to the Microchip manufacturer datasheet, it supports IEEE 802.3 operation at 10, 100, and 1000 Mbps and exposes GMII, MII, and RGMII host interfaces. The on-chip termination resistors for differential pairs simplify the Ethernet connector area, while the configurable MODE[3:0] straps permit selection of the appropriate operating mode. Decoupling placement and controlled pair routing remain critical because switching supplies, processor interfaces, and video circuitry can couple noise into the Ethernet signal path.
Recomendado
Test and Measurement Instrument
The KSZ9131MNXI is appropriate for test and measurement equipment that must communicate over standard copper Ethernet while supporting legacy 10 Mbps and 100 Mbps endpoints. According to the Microchip manufacturer product page, the device provides automatic negotiation across 10/100/1000 Mbps and includes integrated differential-pair termination. Its configurable GMII, MII, or RGMII operation allows the instrument designer to connect the transceiver to an FPGA, embedded controller, or dedicated network controller. In laboratory instruments, maintain controlled grounding and separation between Ethernet magnetics, analog circuitry, and switching regulators, and verify the interface timing against the selected host device.
Recomendado
Embedded Network Access Controller
The KSZ9131MNXI can serve as the Ethernet physical-layer companion to an embedded processor, MCU, or FPGA. According to the Microchip manufacturer datasheet, GMII, MII, and RGMII support lets the host implementation select a suitable data and control interface. The device's 1.8 V, 2.5 V, and 3.3 V tolerant I/Os can align with multiple host logic levels, while its single 3.3 V operating arrangement simplifies board-level supply design. The MODE[3:0] straps must be configured before reset for the intended interface, and the hardware design checklist recommends placing a bulk capacitor near DVDDH and decoupling capacitors close to the device to control startup droop and high-frequency noise.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para KSZ9131MNXI — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | KSZ9131MNX |
|---|---|---|
| Package | 64-pin QFN (8 mm x 8 mm) | 64-pin QFN (8 mm x 8 mm) |
| Brand | Microchip Technology | Microchip Technology |
| Supported Ethernet Rates | 10/100/1000 Mbps | 10/100/1000 Mbps |
| Host Interfaces | GMII/MII/RGMII | GMII/MII/RGMII |
| Ethernet Compliance | IEEE 802.3 | IEEE 802.3 |
| I/O Voltage Tolerance | 3.3 V/2.5 V/1.8 V | 3.3 V/2.5 V/1.8 V |
| Auto-Negotiation | Speed and duplex selection | Speed and duplex selection |
| Differential Pair Termination | On-chip resistors | On-chip resistors |
| Supply Architecture | Single 3.3 V supply with on-chip LDO controller and one external FET | Single 3.3 V supply with on-chip LDO controller and one external FET |
| RoHS Status | Compliant | Compliant |
Principais diferenciais
- Same 64-pin package with matching interface capabilities (vs KSZ9131MNX)
- One device supports three host-interface styles (vs KSZ9131MNX)
- Integrated termination reduces external Ethernet-pair components (vs KSZ9131MNX)
Notas de projeto
Connect DVDDH at pins 18, 30, 40, and 46 to the selected 3.3 V, 2.5 V, or 1.8 V I/O rail. According to the Microchip KSZ9131MNX hardware design checklist, place a bulk capacitor close to the source to prevent supply droop during startup. Place high-frequency decoupling capacitors as close as practical to the device pins so supply noise does not couple into sensitive interface circuitry.
Route Ethernet differential pairs as controlled-impedance, tightly coupled traces with a continuous reference plane. Keep the traces away from switching regulators, inductors, and other high-current paths, and avoid adding test pads or routing discontinuities that impair return currents. Although the KSZ9131MNXI includes on-chip differential-pair termination, the PCB still requires careful impedance control, pair symmetry, and isolation to preserve signal integrity.
Configure MODE[3:0] for the intended interface and reset the device so it enters the corresponding operating mode. The Microchip manufacturer datasheet states that RGMII is selected after power-up or reset when the straps identify an RGMII-capable option. Review the complete pin-description table because assigning a strap incorrectly can prevent normal configuration. Also verify the external FET and all supply connections against the recommended circuit before fabrication.
Keep the GMII, MII, or RGMII host-side traces short and controlled, especially when operating at 1000 Mbps with RGMII. Maintain continuous ground-plane references and use manufacturer-recommended termination for interface signals where specified. Review interface timing and clock/data skew against the host controller requirements, because correct power rails and valid configuration straps do not by themselves guarantee host timing compliance.
Informações de conformidade
Microchip identifies the 64-pin KSZ9131MNX package as RoHS compliant. The related KSZ9131RNXU and KSZ9131RNXV automotive variants are separate ordering options and are not treated as evidence for the KSZ9131MNXI qualification status.