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DP83223

April, 1997

DP83223 TWISTER High Speed Networking Transceiver Device

General Description

The DP83223 Twisted Pair Transceiver is an integrated

circuit capable of driving and receiving three-level (MLT-3)

encoded datastreams. The DP83223 Transceiver is

designed

to

interface

directly

with

National

Semiconductor鈥檚 Fast Ethernet and FDDI Chip Sets or

similar Physical Layer silicon allowing low cost data links

over copper based media. The DP83223 allows links of up

to 100 meters over Shielded Twisted Pair (Type-1A STP)

and Category-5 datagrade Unshielded Twisted Pair (Cat-5

UTP) or equivalent. The DP83223 is available in a 28 pin

PLCC package and a 32 pin PQFP package.

Features

s

s

s

s

s

s

s

s

s

Compatible with ANSI X3.263 TP-PMD draft standard

Allows use of Type 1 STP and Category 5 UTP cables

Requires a single +5V supply

Integrated transmitter and receiver with adaptive equal-

ization circuit

Isolated TX and RX power supplies for minimum noise

coupling

Loopback feature for board diagnostics

Digitally Synthesized transmit signal transition time con-

trol for reduced EMI

Programmable transmit voltage amplitude

Suitable for 100BASE-TX Fast Ethernet and Twisted

Pair FDDI applications

System Connection Diagrams

DP83257VF or DP83256VF-AP

PLAYER+

TX DATA

Descrambled

RX DATA

Recovered

RXDATA

DP83840A

10/100 Ethernet PHY

TXC

Phased

RX CLOCK

Recovered

RXCLOCK

RX DATA

DP83222

Stream Cipher

Scrambled

TX DATA

Scrambled

RX DATA

Signal

Detect

SIGDET

Scrambled

TX DATA

DP83223

Transceiver

PMD

Encoded

TXDATA

PMD

Encoded

RXDATA

DP83223

Transceiver

PMD

Encoded

TXDATA

PMD

Encoded

RXDATA

Magnetics

Magnetics

Twisted Pair

Media

Twisted Pair

Media

100BASE-TX

漏 1997 National Semiconductor Corporation

Twisted Pair FDDI

1

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