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參數(shù)資料
| 型號： | SY89858UMGTR |
| 廠商： | MICREL INC |
| 元件分類： | 時鐘及定時 |
| 英文描述： | PRECISION LOW POWER 1:8 LVPECL FANOUT BUFFER WITH INTERNAL TERMINATION |
| 中文描述： | 89858 SERIES, LOW SKEW CLOCK DRIVER, 8 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), QCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, MLF-32 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大小： | 956K |
| 代理商： | SY89858UMGTR |
Micrel
SY89858U
November 2004
M9999-110504
hbwhelp@micrel.com
or (408) 955-1690
9
LVPECL Output Interface Applications
LVPECL has high input impedance, and very low
output impedance (open emitter), and small signal
swing which results in low EMI. LVPECL is ideal for
driving 50 and 100 controlled impedance
transmission lines. There are several techniques for
terminating the LVPECL output: Parallel
Termination-Thevenin
Termination
Termination. Unused output pairs may be left
floating. However, single-ended outputs must be
terminated, or balanced.
Equivalent,
and
Parallel
(3-resistor),
AC-coupled
R2
82
R2
82
For +2.5V systems,
R1 = 250
,
R2 = 62.5
Z
O
= 50
Z
O
= 50
+3.3V
+3.3V
V
T
= V
CC
—2V
R1
130
R1
130
+3.3V
Figure 4a. Parallel Termination-Thevenin Equivalent
Z = 50
Z = 50
50
50
+3.3V
+3.3V
“source”
“destination”
R
b
V
CC
C1 (optional)
0.01
μ
F
Notes:
1. Power-saving alternative to Thevenin termination.
2. Place termination resistors as close to destination inputs as possible.
3. R
b
resistor sets the DC bias voltage, equal to V
T
.
4. For 2.5V systems, R
b
= 19
,
For 3.3V systems, R
b
= 50
Figure 4b. Parallel Termination (3-Resistor)
Related Product and Support Documentation
Part Number
Function
Data Sheet Link
SY58032U
Ultra-Precision 1:8 LVPECL Fanout Buffer
w/Internal Termination
www.micrel.com/product-info/products/sy58032u.shtml
MLF
TM
Application Note
www.amkor.com/products/notes_papers/MLFAppNote.pdf
HBW Solutions
New Products and Applications
www.micrel.com/product-info/products/solutions.shtml
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