Datasheet > LXT983AHC

LXT983AHC

更新时间： 2024-11-07 21:11:27

品牌	Logo	应用领域
LevelOne		以太网：16GBASE-T 电信电信集成电路
页数	文件大小	规格书
60页	818K
描述
Ethernet Transceiver, PQFP208, PLASTIC, QFP-208

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数据手册

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LXT983AHC 数据手册

DATA SHEET

MARCH, 1999

Revision 1.3

LXT983/983A ^{Dual-Speed, 5-Port Fast Ethernet Repeater}

for 10/100BASE-TX/FX Applications

General Description

Features

• Four 10/100 ports include:

The LXT983 is a 5-port 10/100 Class II Repeater that is

fully compliant with IEEE 802.3 standards. Four ports

directly support 100BASE-TX/10BASE-T copper media

and also support 100BASE-FX fiber media via pseudo-

ECL (PECL) interfaces. The fifth port, a 10- or 100-Mbps

Media Independent Interface (MII), connects to Media

Access Controllers (MACs) for bridge/switch applications.

At 100 Mbps, the MII can also be configured to interface to

another PHY device, such as the LXT970. This data sheet

applies to all LXT983 products (LXT983, LXT983A, and

any subsequent variants), except as specifically noted.

• Complete twisted-pair PHYs with integrated

filters.

• 100BASE-FX PECL interfaces.

• 10/100 MII port connection to either MAC or

PHY.

• Independent segments for 10 and 100 Mbps

operation.

• Cascadable IRBs.

• Integrated per-port LED drivers with user-selectable

modes.

The LXT983 provides auto-negotiation with parallel

detection for the four PHY ports. These ports can also be

configured by the user. The LXT983 provides two internal

repeater state machines—one operating at 10 Mbps and

one at 100 Mbps. Once configured, the LXT983

automatically connects each port to the appropriate

repeater.

• Integrated per-segment LED drivers for collisions and

activity.

• Available in 208-pin QFP package.

• Case Temperature Range: 0-115°C.

The LXT983 provides two Inter-Repeater Backplanes

(IRBs) for expansion—one operating at 10 Mbps and one

at 100 Mbps. Up to 240 ports can be logically combined

into one repeater.

LXT983/983A

Block Diagram

LXT983

Twisted Pair_I/O

Fiber_I/O

10/100

E'net PHY

10 Mbps

Backplane

10BASE-T

Repeater

10M IRB

10/100

E'net PHY

Twisted Pair_I/O

Fiber_I/O

100 Mbps

Backplane

100BASE-T

Repeater

100M IRB

Control

Twisted Pair_I/O

Fiber_I/O

10/100

E'net PHY

Control Logic

& Clocking

Twisted Pair_I/O

Fiber_I/O

10/100

E'net PHY

Port & Segment

Status Indicators

LED Drivers

MII

Reversible MII

Refer to www.level1.com for most current information.

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