LXT9761 Datasheet, PDF (1/78 Pages) Intel Corporation – Fast Ethernet 10/100 Multi-Port Transceiver with RMII

LXT9761/9781
Fast Ethernet 10/100 Multi-Port Transceiver with RMII
Datasheet
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
s 100BASE-T, 10/100-TX, or 100BASE-FX
Switches and multi-port NICs.
Product Features
s Six or eight IEEE 802.3-compliant
10BASE-T or 100BASE-TX ports with
integrated filters
s 3.3V operation
s Optimized for dual-high stacked R45
applications
s Proprietary Optimal Signal Processing™
architecture improves SNR by 3 dB over
ideal analog filters
s Robust baseline wander correction
100BASE-FX fiber-optic capability on all
ports
s Supports both auto-negotiation and legacy
systems without auto-negotiation capability
s JTAG boundary scan
s Multiple Reduced MII (RMII) ports for
independent PHY port operation
s Configurable via MDIO port or external
control pins.
s Maskable interrupts
s Low power consumption (390 mW per
port, typical)
s 208-pin PQFP (LXT9761 and LXT9781)
s 272-pin PBGA (LXT9781 only)
As of January 15, 2001, this document replaces the Level One document
LXT9761/9781 — Fast Ethernet 10/100 Multi-Port Transceiver with RMII.
Order Number: 249048-001
January 2001