DM9301FP Datasheet, PDF (5/22 Pages) Davicom Semiconductor, Inc. – 100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter

DM9301FP
100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter
Pin Description
Pin No.
Media Interface
1, 2
Pin Name
TPRXI+,
TPRXI-
13, 14
TPTXO-,
TPTXO+
24, 25
PECLRXI-,
PECLRXI+
18, 19
22, 23
PECLTXO-,
PECLTXO+
PECLSD-,
PECLSD+
Clock and Misc. Interface
27
OSCI/X1
28
X2
30
OSC/XTL#
8
BGREF
9
BGRET
I/O
Description
I
100Mbps-TX Differential Input Pair:
These pins are differential receive input for 100BASE-
TX. They are capable of receiving 100BASE-TX MLT-3
data.
O
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.
I
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.
O
100BASE-FX Transmit Differential Output Pair:
These outputs drive NRZI encoded data for PECL FX
interface.
I
100BASE-FX PECL Signal detect:
These pins are differential signals that indicate to the
DM9301FP that the Optical Module interface is
detecting valid optical energy.
I
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.
O
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.
I
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.
I
Bandgap Voltage Reference Resistor:
It connects to a 6.49KΩ, 1% error tolerance resistor
between this pin and BGRET pin 9 to provide an
accurate current reference for the chip.
I
Bandgap Return
Return pin for 6.49KΩ resistor connection, DO NOT
CONNECT TO GROUND.
Final
5
Version: DM9301FP-DS-F03
June 06, 2007