LXT914
Flexible Quad Ethernet Repeater
Datasheet
The LXT914 is an integrated multi-port repeater designed for mixed-media networks. It
provides all the active circuitry required for the repeater function in a single CMOS device. It
includes one Attachment Unit Interface (AUI) port and four 10BASE-T transceivers. The AUI
port is mode selectable: DTE mode allows connection of an external transceiver (10BASE2,
10BASE5, 10BASE-T or FOIRL) or a drop cable. MAU mode creates a MAU output allowing
direct connection to another DTE interface. The 10BASE-T transceivers are entirely self-
contained with internal filters which simplify the design work required for FCC-compliant EMI
performance.
An inter-repeater backplane interface allows 128 or more 10BASE-T ports to be cascaded
together. In addition, a serial port provides information for network management.
The LXT914 requires only a single 5-volt power supply due to an advanced CMOS fabrication
process.
Product Features
Applications
I
Four integrated 10BASE-T transceivers
and one AUI transceiver on a single chip
I
Programmable DTE/MAU interface on
AUI port
I
Seven integrated LED drivers with four
unique operational modes
I
On-chip transmit and receive filtering
I
Automatic partitioning of faulty ports,
enabled on an individual port basis
I
Automatic polarity detection and correction
I
Programmable squelch level allows
extended range in low-noise environments
I
Synchronous or asynchronous inter-
repeater backplane supports “hot
swapping”
I
Inter-repeater backplane allows cascaded
repeaters, linking 128 or more 10BASE-T
ports
I
Serial port for selecting programmable
options
I
68-pin PLCC (Commercial or Extended
temp range)
I
100-pin PQFP (Commercial temp range)
I
LAN Repeaters
I
Integrated Repeaters
I
Switched Repeater Clusters
As of January 15, 2001, this document replaces the Level One document
known as
Flexible Quad Ethernet Repeater
.
Order Number: 248989-001
January 2001