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FWLXTLED0QE000

更新时间： 2024-10-29 03:16:43
品牌 Logo 应用领域
英特尔 - INTEL 局域网（LAN）标准
页数 文件大小 规格书
226页 2074K
描述
Advanced 8-Port 10/100 Mbps PHY Transceivers

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FWLXTLED0QE000 数据手册

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Intel® LXT9785 and Intel® LXT9785E  
Advanced 8-Port 10/100 Mbps PHY  
Transceivers  
Datasheet  
The Intel® LXT9785 and Intel® LXT9785E are 8-port Fast Ethernet PHY Transceivers  
supporting IEEE 802.3 physical layer applications at 10 Mbps and 100 Mbps. These devices  
provide Serial/Source Synchronous Serial Media Independent Interfaces (SMII/SS-SMII) and  
Reduced Media Independent Interface (RMII) for switching and other independent port  
applications. The LXT9785 and LXT9785E are identical except for the IP telephony features  
included in the LXT9785E transceiver. The LXT9785E is an enhanced version of the LXT9785  
that detects Data Terminal Equipment (DTE) requiring power from the switch over a CAT5  
cable. The system uses the information collected by the LXT97985E to apply power if the DTE  
at the far end requires power over the cable, such as an IP telephone.  
Each network port can provide a twisted-pair (TP) or Low-Voltage Positive Emitter Coupled  
Logic (LVPECL) interface. The twisted-pair interface supports 10 Mbps and 100 Mbps  
(10BASE-T and 100BASE-TX) Ethernet over twisted-pair. The LVPECL interface supports  
100 Mbps (100BASE-FX) Ethernet over fiber-optic media.  
The LXT9785/LXT9785E provides three discrete LED driver outputs for each port. The devices  
support both half-duplex and full-duplex operation at 10 Mbps and 100 Mbps and require only a  
single 2.5 V power supply.  
Applications  
„ Enterprise switches  
„ IP telephony switches  
„ Storage Area Networks  
„ Multi-port Network Interface Cards (NICs)  
Product Features  
„ Eight IEEE 802.3-compliant 10BASE-T or „ Supports both auto-negotiation systems and  
100BASE-TX ports with integrated filters.  
legacy systems without auto-negotiation  
capability.  
„ 100BASE-FX fiber-optic capability on all  
ports.  
„ 2.5 V operation.  
„ Robust baseline wander correction.  
„ Configurable through the MDIO port or  
external control pins.  
„ Low power consumption; 250 mW per port  
typical.  
„ JTAG boundary scan.  
„ Multiple RMII or SMII/SS-SMII ports for „ 208-pin PQFP: LXT9785HC,  
independent PHY port operation.  
LXT9785EHC, LXT9785HE.  
„ Auto MDI/MDIX crossover capability.  
„ 241-ball BGA: LXT9785BC,  
LXT9785EBC.  
„ Proprietary Optimal Signal Processing™  
architecture improves SNR by 3 dB over  
ideal analog filters.  
„ 196-ball BGA: LXT9785MBC  
„ DTE detection for remote powering  
„ Optimized for dual-high stacked RJ-45  
applications (LXT9785E only).  
applications.  
o
„ Extended temperature operation of -40 C to  
o
„ MDIO sectionalization into 2x4 or 1x8  
+85 C (LXT9785HE).  
configurations.  
Document Number: 249241  
Revision Number: 007  
Revision Date: August 28, 2003  
1234567...226

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