- 您现在的位置：买卖IC网 > PDF目录10153 > KSZ8721CL TR (Micrel Inc)TXRX 10/100 3.3V 48-LQFP PDF资料下载
参数资料
| 型号： | KSZ8721CL TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/32页 |
| 文件大小： | 0K |
| 描述： | TXRX 10/100 3.3V 48-LQFP |
| 标准包装： | 1,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | MII |
| 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： | 带卷 (TR) |
| 其它名称： | KSZ8721CLTR KSZ8721CLTR-ND |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
KS8721CL
Micrel
M9999-100804
16
October 2004
Power Management
The KS8721CL 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 KS8721CL turns off everything
except for the Energy Detect and PLL circuits when the cable is not installed. In other words, the KS8721CL 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 field application engineer (FAE) for a reference schematic on fiber 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 fiber operation, the FXSD pin should connect to the signal detect (SD) output of the fiber module. The internal threshold of
FXSD is around 1/2 V
DD ±50mV (1.25V ±0.05V). Above this level, the fiber 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,
FX mode
but greater than 0.6V
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 fiber module SD should cover the threshold variation. A resistive voltage divider is
recommended to adjust the SD voltage range.
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 fiber signal detected. The transmitter is not affected by receiving an FEF and still sends out its normal transmit pattern
from MAC. FEF can be disabled by strapping pin 27 low. Refer to the “Strapping Options” section.
Media Converter Operation
The KS8721CL is capable of performing media conversion with two parts in a back-to-back RMII loop-back mode as indicated
in the diagram. Both parts are in RMII mode and with RMII BTB asserted (pins 21 and 22 strapped high). One part is operating
in TX mode and the other is operating in FX mode. Both parts can share a common 50MHz oscillator.
Under this operation, auto-negotiation on the TX side prohibits 10BASE-T link-up. Additional options can be implemented
under this operation. Disable the transmitter and set it at tri-state by controlling the high TXD2 pin. In order to do this, RXD2
and TXD2 pins need to be connected via inverter. When TXD2 pin is high in both the copper and fiber operation, it is disabled
transmit. Meanwhile, the RXD2 pin on the copper side serves as the energy detect and can indicate if a line signal is detected.
TXD3 should be tied low and RXD3 allowed to float. Please contact your Micrel FAE for a media converter reference design.
Figure 3. Fiber Module
Rx +/-
Tx +/-
FTx
FRx
Pin
34
TxD
(Fiber Mode)
21 22
Pin
21 22
50MHz
VCC
OSC
TxC/
Ref_CLK
TxC/
Ref_CLK
RxD
VCC
KS8721CL
KS8721CL
To the SD Pin of the
Fiber Module
TxD
相关PDF资料 |
PDF描述 |
|---|---|
| MS27472E18B35P | CONN RCPT 66POS WALL MNT W/PINS |
| LTC2858IDD-2#PBF | IC TXRX RS485/RS422 10-DFN |
| MS3116P8-3P | CONN PLUG 3POS STRAIGHT W/PINS |
| VE-2N4-MX-F1 | CONVERTER MOD DC/DC 48V 75W |
| MS3102R20-18PW | CONN RCPT 9POS BOX MNT W/PINS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| KSZ8721SL | 功能描述:以太网 IC 10/100 Base-TX/FX Physical Layer Transceiver, Single 3.3V Supply, 48-SSOP (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 |
| KSZ8721SL TR | 功能描述:以太网 IC 10/100 Base-TX/FX Physical Layer Transceiver, Single 3.3V Supply, 48-SSOP (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 |
| KSZ8721SLA4 | 功能描述:TXRX 10/100 3.3V 48-SSOP 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 |
| KSZ8721SLA4 TR | 功能描述:TRANSCEIVER 10/100 3.3V 48-SSOP 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 |
| KSZ8721SL-EVAL | 功能描述:以太网开发工具 KSZ8721SL 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: |
发布紧急采购，3分钟左右您将得到回复。