DP83953 datasheet(5/90 Pages) NSC

5 / 90 page

www.national.com

2.0 Pin Descriptions

TP = Twisted Pair interface compatible, TT = TTL compatible, I = Input, O = Output, Analog = current dependent effect,

AL = AUI Level, AD = AUI Drive

Pin Name

Pin No.

Driver

Type

I/O

Description

Network Interface Pins

RXI2- to RXI13-

Twisted Pair Receive Input Negative

RXI2+ to RXI13+

Twisted Pair Receive Input Positive

TXO2- to TXO13-

Twisted Pair Transmit Output Negative

TXO2+ to TXO13+

Twisted Pair Transmit Output Positive

FILTTL

153

FILter/TTL: This pin can be utilized for the PCB diagnostic pur-

poses.

0: Normal repeater operation

1: Differential transmit signals change to TTL level +TX and de-

layed +TX.

REQ

Analog

Equalization Resistor: A resistor connected between this pin and

GND or VDD adjusts the equalization step amplitude on the

Manchester encoded transmit data. Care must be taken to ensure

system timing integrity when using cable lengths greater than

100m. The value here is dependent upon board layout.

RTX

Analog

Extended Cable Resistor: A resistor connected between this pin

and GND or VDD adjusts the amplitude of the differential transmit

outputs. Care must be taken to ensure system timing integrity

when using cable lengths greater than 100m. The value here is

dependent upon board layout.

AUI Port

CD1+

111

AUI Collision Detect Input Positive

CD1-

112

AUI Collision Detect Input Negative

RX1+

113

AUI Receive Input Positive

RX1-

114

AUI Receive Input Negative

TX1+

109

AUI Transmit Output Positive

TX1-

110

AUI Transmit Output Negative

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