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KS8721B
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KS8721B

Product Overview

  • Category: Ethernet Transceiver
  • Use: The KS8721B is a single-chip 10/100BASE-TX/FX Ethernet physical layer transceiver. It provides all the necessary functions required to implement a 10/100Mbps Ethernet Physical Layer Interface.
  • Characteristics: The KS8721B offers low power consumption, high performance, and excellent reliability. It supports both full-duplex and half-duplex modes of operation, making it suitable for various networking applications.
  • Package: The KS8721B comes in a compact and industry-standard 48-pin LQFP package.
  • Essence: The essence of the KS8721B lies in its ability to provide a reliable and efficient Ethernet physical layer interface for network devices.
  • Packaging/Quantity: The KS8721B is typically sold in reels containing 250 units.

Specifications

The KS8721B features the following specifications:

  • Interface: MII (Media Independent Interface)
  • Data Rate: 10/100 Mbps
  • Operating Voltage: 3.3V
  • Operating Temperature Range: -40°C to +85°C
  • Power Consumption: < 300mW
  • Supported Cable Types: Category 5 or better
  • LED Indicators: Link, Activity, Full/Half Duplex

Detailed Pin Configuration

The KS8721B has a total of 48 pins. Here is a detailed pin configuration:

  1. VDDA
  2. VSSA
  3. VDDIO
  4. VSSIO
  5. TX_CLK
  6. TX_EN
  7. TXD[0]
  8. TXD[1]
  9. TXD[2]
  10. TXD[3]
  11. TX_ER
  12. CRS
  13. COL
  14. RX_CLK
  15. RX_DV
  16. RXD[0]
  17. RXD[1]
  18. RXD[2]
  19. RXD[3]
  20. RX_ER
  21. MDC
  22. MDIO
  23. VDDXTAL
  24. VSSXTAL
  25. REFCLKO
  26. VDDPLL
  27. VSSPLL
  28. PLL_LOCK
  29. XTALIN
  30. XTALOUT
  31. VDDCORE
  32. VSSCORE
  33. VDDPLL2
  34. VSSPLL2
  35. PLL2_LOCK
  36. XTALIN2
  37. XTALOUT2
  38. VDDAUX
  39. VSSAUX
  40. AUX_CLK
  41. AUX_EN
  42. AUX_OUT
  43. VDDAVDD
  44. VSSAVDD
  45. AVDD
  46. AVSS
  47. VDD
  48. VSS

Functional Features

The KS8721B offers the following functional features:

  • Auto-negotiation and auto-MDI/MDIX support
  • Energy Efficient Ethernet (EEE) support
  • Loopback mode for diagnostic purposes
  • Integrated 1.8V regulator for reduced power consumption
  • Built-in signal quality indicator (SQI)
  • Supports various power-down modes for power-saving operation

Advantages and Disadvantages

Advantages of the KS8721B include:

  • Low power consumption
  • High performance and reliability
  • Support for full-duplex and half-duplex modes
  • Compact package size

Disadvantages of the KS8721B include:

  • Limited to 10/100 Mbps data rate
  • Requires external magnetics for proper operation

Working Principles

The KS8721B operates based on the principles of Ethernet communication. It receives and transmits data packets using the MII interface. The transceiver supports auto-negotiation to establish the link parameters with the connected device. It also incorporates various error detection and correction mechanisms to ensure reliable data transmission.

Detailed Application Field Plans

The KS8721B is commonly used in the following application fields:

  • Network switches
  • Routers
  • Industrial automation systems
  • Embedded systems
  • Ethernet-enabled devices

Alternative Models

If the KS8721B does not meet specific requirements, alternative models that can be considered include:

  1. KSZ8081RNB: 10/100BASE-TX/FX Ethernet Transceiver with Reduced Pin Count.
  2. DP83848CVV: Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver.
  3. LAN8720A: 10/100 Ethernet Transceiver with HP Auto-MDIX Support.

These alternative models offer similar functionality and can be suitable replacements for the KS8721B in different applications.

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Lista 10 Vanliga frågor och svar relaterade till tillämpningen av KS8721B i tekniska lösningar

Sure! Here are 10 common questions and answers related to the application of KS8721B in technical solutions:

Q1: What is KS8721B? A1: KS8721B is a highly integrated Ethernet physical layer transceiver (PHY) chip that provides a complete solution for 10/100BASE-TX Ethernet applications.

Q2: What are the key features of KS8721B? A2: The key features of KS8721B include support for 10/100 Mbps data rates, auto-negotiation, MDI/MDIX crossover, loopback modes, and low power consumption.

Q3: How can I interface KS8721B with a microcontroller or processor? A3: KS8721B uses a standard MII (Media Independent Interface) or RMII (Reduced Media Independent Interface) interface, which allows easy integration with various microcontrollers or processors.

Q4: Can KS8721B be used in both full-duplex and half-duplex modes? A4: Yes, KS8721B supports both full-duplex and half-duplex modes of operation, depending on the requirements of your application.

Q5: Does KS8721B support Auto-MDIX (Automatic Medium-Dependent Interface Crossover)? A5: Yes, KS8721B supports Auto-MDIX, which eliminates the need for a separate crossover cable when connecting to other network devices.

Q6: What is the operating voltage range of KS8721B? A6: KS8721B operates from a single 3.3V power supply, making it compatible with a wide range of systems.

Q7: Can KS8721B be used in industrial temperature environments? A7: Yes, KS8721B is designed to operate reliably in industrial temperature ranges, typically from -40°C to +85°C.

Q8: Does KS8721B support power-saving features? A8: Yes, KS8721B incorporates power-saving features such as Energy Detect Power-Down (EDPD) and Wake-on-LAN (WoL) to minimize power consumption during idle periods.

Q9: Is KS8721B compliant with industry standards? A9: Yes, KS8721B is compliant with IEEE 802.3 and 802.3u Ethernet standards, ensuring compatibility with other network devices.

Q10: Are there any application notes or reference designs available for KS8721B? A10: Yes, Micrel (now Microchip) provides application notes, reference designs, and technical documentation to assist in the implementation of KS8721B in various technical solutions.

Please note that these answers are general and may vary depending on specific implementation details and requirements.