DM9301 datasheet(5/22 Pages) ETC

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DM9301

100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter

Final

Version: DM9301-DS-F02

May 8, 2000

Pin Description

Pin No.

Pin Name

I/O

Description

Media Interface

1, 2

TPRXI+,

TPRXI-

100Mbps-TX Differential Input Pair:

These pins are differential receive input for 100BASE-

TX. They are capable of receiving 100BASE-TX MLT-3

data.

13, 14

TPTXO-,

TPTXO+

100BASE-TX Differential Output Pair:

These outputs drive MLT-3 encoded data over 100Mbps

twisted pair cable and provide controlled rise and fall

times designed to filter the transmitter

output,

reducing any associated EMI.

24, 25

PECLRXI-,

PECLRXI+

100BASE-FX PECL Receive Data Differential Pair:

These pins are differential receive input for 100BASE-

FX PECL. They are capable of receiving PECL

100BASE-FX NRZI data.

18, 19

PECLTXO-,

PECLTXO+

100BASE-FX Transmit Differential Output Pair:

These outputs drive NRZI encoded data for PECL FX

interface.

22, 23

PECLSD-,

PECLSD+

100BASE-FX PECL Signal detect:

These pins are differential signals that indicate to the

DM9301 that the Optical Module interface is detecting

valid optical energy.

Clock and Misc. Interface

OSCI/X1

Crystal or Oscillator Input:

This pin should connect to one side of a 25MHz, 50ppm

crystal if OSC/XTL#=0. This pin is the 25MHz, 50ppm

external TTL oscillator input, if OSC/XTLB=1.

Crystal Oscillator Output:

The other side of a 25MHz, 50ppm crystal should

connect to this pin if OSC/XTL#=0. Leave this pin open

if OSC/XTL#=1.

OSC/XTL#

Crystal or Oscillator Selector Pin:

OSC/XTL#=0: An external 25MHz, 50ppm crystal

should connect to X1 and X2 pins.

OSC/XTL#=1: An external 25MHz, 50ppm oscillator

should connect to X1 and left X2 pin

open.

8BGREF

Bandgap Voltage Reference Resistor:

It connects to a 6.49K

Ω, 1% error tolerance resistor

between this pin and BGRET pin 9 to provide an

accurate current reference for the chip.

9BGRET

Bandgap Return

Return pin for 6.49K

Ω resistor connection, DO NOT

CONNECT TO GROUND.

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