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| 型号： | KSZ8721BL TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/35页 |
| 文件大小： | 0K |
| 描述： | IC TXRX PHY 10/100 3.3V 48LQFP |
| 标准包装： | 1 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | MII，RMII |
| 电源电压： | 3 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 标准包装 |
| 产品目录页面： | 1080 (CN2011-ZH PDF) |
| 配用： | 576-1627-ND - BOARD EVALUATION FOR KSZ8721BMC 576-1626-ND - BOARD EVALUATION FOR KSZ8721BL |
| 其它名称： | 576-1028-6 |
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Micrel, Inc.
KS8721BL/SL
June 2009
16
M9999-062509-1.3
10/100 BASE-T
Media Dependent Interface
10/100 BASE-T
Media Dependent Interface
Transmit Pair
Receive Pair
Transmit Pair
Receive Pair
Modular Connector (RJ45)
HUB
(Repeater or Switch)
Modular Connector (RJ45)
HUB
(Repeater or Switch)
Figure 2. Crossover Cable
Power Management
The KS8721BL/SL offers the following modes for power management:
Power-Down Mode: This mode can be achieved by writing to Register 0.11 or pulling pin 30 PD# low.
Power-Saving Mode: This mode can be disabled by writing to Register 1fh.10. The KS8721BL/SL turns off
everything except for the Energy Detect and PLL circuits when the cable is not installed. In other words, the
KS8721BL/SL shuts down most of the internal circuits to save power if there is no link. Power-saving mode is in
the most effective state when auto-negotiation mode is enabled.
100BT FX Mode
Please contact your local eld application engineer (FAE) for a reference schematic on ber connection.
100BT FX mode is activated when FXSD/FXEN is higher than 0.6V (this pin has a default pull down). Under this mode,
the auto-negotiation and auto-MDI-X features are disabled.
In ber operation, the FXSD pin should connect to the signal detect (SD) output of the ber module. The internal
threshold of FXSD is around 1/2 VDD ±50mV (1.25V ±0.05V). Above this level, the ber signal is considered detected.
The operation is summarized in the following table:
FXSD/FXEN
Condition
Less than 0.6V
100TX mode
Less than 1.25V,
but greater than 0.6V
FX mode
No signal detected
FEF generated
Greater than 1.25
FX mode
Signal detected
Table 1. 100BT FX Mode
To ensure proper operation, the swing of ber module SD should cover the threshold variation. A resistive voltage
divider is recommended to adjust the SD voltage range.
Far End Fault (FEF), repetition of a special pattern which consists of 84-one and 1-zero, is generated under “FX mode
with no signal detected.” The purpose of FEF is to notify the sender of a faulty link. When receiving an FEF, the LINK
will go down to indicate a fault, even with ber signal detected. The transmitter is not affected by receiving an FEF and
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相关代理商/技术参数 |
参数描述 |
|---|---|
| KSZ8721BMC-EVAL | 功能描述:以太网开发工具 KSZ8721BMC Evaluation Board RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
| KSZ8721BT | 功能描述:以太网 IC 10/100 Base-TX/FX Physical Layer Transceiver, Single 3.3V Supply, 48-TQFP (Lead Free) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8721BTA4 | 功能描述:TXRX 10/100 3.3V 48-TQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,140 系列:AU 类型:收发器 驱动器/接收器数:1/1 规程:CAN 电源电压:5.3 V ~ 27 V 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:管件 其它名称:935267940512AU5790D14AU5790D14-ND |
| KSZ8721BT-EVAL | 功能描述:以太网开发工具 KSZ8721BT Evaluation Board RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
| KSZ8721BTR | 制造商:Micrel 功能描述:Physical Layer Transceiver 1Ch 100Mbps |
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