參數(shù)資料
型號(hào)： FW803
英文描述： PHY IEEE 1394A Three-Cable Transceiver/Arbiter Device
中文描述： PHY的IEEE 1394A端口三線收發(fā)器/仲裁器裝置
文件頁(yè)數(shù)： 12/24頁(yè)
文件大?。?/td> 395K
代理商： FW803
12
Agere Systems Inc.
Data Sheet, Rev. 3
June 2001
Three-Cable Transceiver/Arbiter Device
FW803 PHY
IEEE
1394A
Crystal Selection Considerations
(continued)
Load Capacitance
(continued)
The values for load capacitors (C
A
and C
B
) should be calculated using this formula:
C
A
= C
B
= (C
L
– C
stray
)
×
2
Where:
C
L
= load capacitance specified by the crystal manufacturer
C
stray
= capacitance of the board and the FW803, typically 2—3 pF
Board Layou
t
The layout of the crystal portion of the PHY circuit is important for obtaining the correct frequency and minimizing
noise introduced into the FW803 PLL. The crystal and two load capacitors should be considered as a unit during lay-
out. They should be placed as close as possible to one another, while minimizing the loop area created by the com-
bination of the three components. Minimizing the loop area minimizes the effect of the resonant current that flows in
this resonant circuit. This layout unit (crystal and load capacitors) should then be placed as close as possible to the
PHY XI and XO terminals to minimize trace lengths. Vias should not be used to route the XI and XO signals.
1394 Application Support Contact Information
E-mail: 1394support@agere.com
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of
those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended peri-
ods can adversely affect device reliability.
Table 2. Absolute Maximum Ratings
* Except for 5 V tolerant I/O (CTL0, CTL1, D0—D7, and LREQ) where V
I
max = 5.5 V.
Parameter
Symbol
Min
Max
Unit
Supply Voltage Range
Input Voltage Range*
Output Voltage Range at Any Output
Operating Free Air Temperature
Storage Temperature Range
V
DD
V
I
V
O
T
A
T
stg
3.0
0.5
0.5
0
–65
3.6
V
V
V
°
C
°
C
V
DD
+ 0.5
V
DD
+ 0.5
70
150
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