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KS8721SL from MICREL

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KS8721SL

Manufacturer: MICREL, MICRO, MICREL

3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver

Partnumber Manufacturer Quantity Availability
KS8721SL MICREL, MICRO, MICREL 527 In Stock

Description and Introduction

3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver The KS8721SL is a single-port 10/100 Mbps Ethernet Physical Layer Transceiver (PHY) manufactured by Microchip Technology (formerly Micrel).  

### **Specifications:**  
- **Interface:** MII (Media Independent Interface) and RMII (Reduced Media Independent Interface)  
- **Data Rate:** 10 Mbps or 100 Mbps (auto-negotiation supported)  
- **Compliance:** IEEE 802.3/802.3u standards  
- **Power Supply:** 3.3V operation  
- **Package:** 32-pin LQFP (Low-Profile Quad Flat Package)  
- **Temperature Range:** Commercial (0°C to +70°C) and Industrial (-40°C to +85°C)  
- **Cable Support:** UTP (Unshielded Twisted Pair) Category 3, 4, or 5  

### **Descriptions:**  
The KS8721SL is a highly integrated PHY transceiver designed for Ethernet applications. It supports both MII and RMII interfaces for flexible connectivity with Ethernet MAC controllers. The device includes auto-negotiation, link status detection, and energy detection features for efficient network operation.  

### **Features:**  
- Supports **Auto-MDIX** (automatic crossover detection)  
- **Auto-negotiation** for speed and duplex mode selection  
- **LinkMD®** cable diagnostics for fault detection  
- **Low power consumption** with power-down modes  
- **LED indicators** for link/activity and speed status  
- **Jabber function** to prevent excessive transmission  
- **Loopback modes** for diagnostics  

This information is based on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver

Alternative Part Number

  • DP83848IVV --: Single-port 10/100 Ethernet PHY with RMII/MII interface, widely used as a functional replacement for the KS8721SL in embedded designs.
  • LAN8720A --: Low-power 10/100 Ethernet PHY with RMII interface, pin-compatible in many KS8721SL sockets and readily available.
  • RTL8201F --: Cost-effective single-port 10/100 Fast Ethernet PHY with MII/RMII support, commonly substituted for KS8721SL in networking products.

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