參數(shù)資料
型號: L84225
英文描述: L84225 100BaseTX/FX/10BaseT Physical Layer Device technical manual 4/02
中文描述: L84225 100BaseTX/FX/10BaseT物理層設(shè)備的技術(shù)手冊,4月2日
文件頁數(shù): 79/118頁
文件大?。?/td> 890K
代理商: L84225
Application Information
Copyright 1999-2002 by LSI Logic Corporation. All rights reserved.
79 of 118
April, 2002
Figure 13
FX Interface to 3.3V Fiber Modules
4.5.3 Operation with 5V Fiber Transceivers
It is also possible to use the L84225 with 5V fiber modules by changing
the resistive termination network slightly.
Since the L84225 FXOP/FXON Outputs are 5V tolerant, the output
termination resistors should be a pull-up of 61.9 Ohms to the 5V supply,
and a pulldown of 261 Ohms to GND, as shown in
Figure 14
. This
provides an Output High Voltage of 4.05V, and a low of about 3.3V to the
fiber module.
The termination network on the FXIP/FXIN inputs of the L84225 must be
modified for operation with 5V modules by adding a third resistor as a
“tap” on the pulldown leg, as shown in
Figure 14
. This divides down the
voltage seen at the input of the L84225 so that it does not exceed the
range of the input buffer. The pull-up resistor recommended by the 5V
module supplier generally remains the same - usually about 82.5 Ohms
to the 5V supply. The normally recommended 125-Ohm pulldown resistor
must be split into two. The values of this new pair should be 52.3 Ohms
connected to the pull-up resistor and 73.2 Ohms connected from the
FXIP
FXIN
FXOP
FXON
3.3 V
Fiber
Transceiver
TD
TD-
69.8
174
RD
RD-
127
82.5
SD
127
VDD = 3.3V
L84220
10/100 TX/FX
Transceiver
SD/FXEN
SD_THR
82.5
VDD = 3.3V
3.3V
3.3V
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