lxt9781 Intel Corporation, lxt9781 Datasheet

lxt9781

Manufacturer Part Number

lxt9781

Description

Fast Ethernet 10/100 Multi-port Transceiver With Rmii

Manufacturer

Intel Corporation

Datasheet

1.LXT9781.pdf (78 pages)

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LXT9761/9781

Fast Ethernet 10/100 Multi-Port Transceiver with RMII

The LXT9781 is an eight-port PHY Fast Ethernet Transceiver that supports IEEE 802.3 physical

layer applications at both 10 Mbps and 100 Mbps. It provides a Reduced Media Independent

Interface (RMII) for switching and other independent port applications. The LXT9761 offers the

same features and functionality in a six-port device. This data sheet uses the singular designation

“LXT97x1” to refer to both devices.

All network ports provide a combination twisted-pair (TP) or pseudo-ECL (PECL) interface for

a 10/100BASE-TX or 100BASE-FX connection.

The LXT97x1 provides three discrete LED driver outputs for each port, as well as eight global

serial LED outputs. The device supports both half- and full-duplex operation at 10 Mbps and 100

Mbps, and requires only a single 3.3V power supply.

Applications

Product Features

As of January 15, 2001, this document replaces the Level One document

LXT9761/9781 — Fast Ethernet 10/100 Multi-Port Transceiver with RMII.

100BASE-T, 10/100-TX, or 100BASE-FX

Switches and multi-port NICs.

Six or eight IEEE 802.3-compliant

10BASE-T or 100BASE-TX ports with

integrated filters

3.3V operation

Optimized for dual-high stacked R45

applications

Proprietary Optimal Signal Processing™

architecture improves SNR by 3 dB over

ideal analog filters

Robust baseline wander correction

100BASE-FX fiber-optic capability on all

ports

Supports both auto-negotiation and legacy

systems without auto-negotiation capability

JTAG boundary scan

Multiple Reduced MII (RMII) ports for

independent PHY port operation

Configurable via MDIO port or external

control pins.

Maskable interrupts

Low power consumption (390 mW per

port, typical)

208-pin PQFP (LXT9761 and LXT9781)

272-pin PBGA (LXT9781 only)

Order Number: 249048-001

Datasheet

January 2001

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