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| 型號： | 22368 |
| 英文描述： | Home Networking Board Design Using PCnet-Home Devices? - (PDF) |
| 中文描述： | 家庭網(wǎng)絡(luò)電路板設(shè)計(jì)使用PCnet家用裝置？ - （PDF格式） |
| 文件頁數(shù)： | 4/14頁 |
| 文件大小： | 275K |
| 代理商： | 22368 |
Home Networking Board Design Using PCnet-Home Devices
3
Table 1.
Suggested Bypassed Power Pins for
160 PQFP
Note:
For 144-pin design, refer to the power signals in
Table 1.
Figure 3.
Recommended Bypass Capacitors
CRYSTAL OSCILLATOR
PCnet-Home devices include on-chip oscillator cir-
cuitry allowing the use of a 20 MHz external crystal
attached to the XTAL1 and XTAL2 pins, and XCLK/
XTAL pin tied LOW. Alternatively, a 60 MHz clock
source can also be used to drive the XTAL1 pin, in
which case the XTAL2 pin MUST be left unconnected
and XCLK/XTAL tied HIGH. Table 2 shows the ap-
propriate clock select and Figure 4 shows the clock
interface.
Table 2.
External Clock Source Selection
When selecting a crystal for use in the PCnet-Home
design, the crystal should meet the 50 ppm, 18 pF stan-
dard load capacitors (or 33 pF), and 0.005% tolerance
at 20 MHz (see Table 3).
Figure 4.
Crystal Clock Source
Two crystal suppliers are listed below:
Ecliptik Corporation -
www.ecliptik.com
Epson Corporation -
www.epson.com
External Crystal Characteristics
When using a crystal to drive the oscillator, the follow-
ing crystal specification in Table 3 may be used to en-
sure less than ±0.5 ns jitter at DO±.
Table 3.
Crystal Characteristics
Note:
*Requires trimming specification; not trimmed is
50 ppm total.
Pin No.
Power Names
Bypass Caps
100
VDDCO
–
power for PLL
0.1
μ
F
–
0.2
μ
F
103
VDDHR_RX
–
power for
HomePNA
0.1
μ
F
–
0.2
μ
F
105
VDDHR_TX
–
power for
HomePNA
0.1
μ
F
–
0.2
μ
F
107
DVDDA_HR
–
ref voltage
0.1
μ
F
–
0.2
μ
F
115
DVDD_TX
–
power for
10BASE-T
0.1
μ
F
–
0.2
μ
F
119
DVDD_RX
–
power for
10BASE-T
0.1
μ
F
–
0.2
μ
F
109
DVDDA_HR
–
power for
HomePNA
0.1
μ
F
–
0.2
μ
F
113
DVDDD
–
digital power
0.1
μ
F
–
0.2
μ
F
Clock Source
Clock Select Pin
Pin Name
20 MHz crystal
XCLK/XTAL LOW
XTAL1 and XTAL2
60 MHz osc.
XCLK/XTAL HIGH
XTAL1
0.1 μF
0.1 μF
Am79C978
D
D
A
A
22368A-3
Parameter
Min
Nom
Max Units
1. Parallel Resonant
Frequency
20
MHz
2. Resonant Frequency Error
-50
+50
ppm
3. Change in Resonant
Frequency With Respect To
Temperature (0
°
70
°
C)*
-40
+40
ppm
4. Crystal Load Capacitance
15
18
33
pF
5. Motional Crystal
Capacitance (C1)
0.022
pF
6. Internal Equivalent Series
Resistance
50
ohm
7. Shunt Capacitance
7
pF
X
X
X
Am79C978
18 pF
18 pF
10 K
20 MHz
22368A-4
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