lxt9785 Intel Corporation, lxt9785 Datasheet

lxt9785

Manufacturer Part Number

lxt9785

Description

Advanced 8-port 10/100 Mbps Phy Transceivers

Manufacturer

Intel Corporation

Datasheet

1.LXT9785.pdf (226 pages)

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Intel

Advanced 8-Port 10/100 Mbps PHY

Transceivers

The Intel

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

Product Features

Enterprise switches

IP telephony switches

Eight IEEE 802.3-compliant 10BASE-T or

100BASE-TX ports with integrated filters.

100BASE-FX fiber-optic capability on all

ports.

2.5 V operation.

Low power consumption; 250 mW per port

typical.

Multiple RMII or SMII/SS-SMII ports for

independent PHY port operation.

Auto MDI/MDIX crossover capability.

Proprietary Optimal Signal Processing™

architecture improves SNR by 3 dB over

ideal analog filters.

Optimized for dual-high stacked RJ-45

applications.

MDIO sectionalization into 2x4 or 1x8

configurations.

LXT9785 and Intel

LXT9785E are 8-port Fast Ethernet PHY Transceivers

Storage Area Networks

Multi-port Network Interface Cards (NICs)

Supports both auto-negotiation systems and

legacy systems without auto-negotiation

capability.

Robust baseline wander correction.

Configurable through the MDIO port or

external control pins.

JTAG boundary scan.

208-pin PQFP: LXT9785HC,

LXT9785EHC, LXT9785HE.

241-ball BGA: LXT9785BC,

LXT9785EBC.

196-ball BGA: LXT9785MBC

DTE detection for remote powering

applications (LXT9785E only).

Extended temperature operation of -40

+85

C (LXT9785HE).

LXT9785E

Revision Date: August 28, 2003

Document Number: 249241

Datasheet

Revision Number: 007

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