參數(shù)資料
型號(hào): SY100EP56VK4GTR
廠商: MICREL INC
元件分類: 通用總線功能
英文描述: 3.3V/5V PECL/ECL 3GHz DUAL DIFFERENTIAL 2:1 MULTIPLEXER
中文描述: 100E SERIES, DUAL 2 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDSO20
封裝: LEAD FREE, TSSOP-20
文件頁(yè)數(shù): 7/8頁(yè)
文件大?。?/td> 479K
代理商: SY100EP56VK4GTR
7
ECL Pro
SY100EP56V
Micrel, Inc.
M9999-120505
hbwhelp@micrel.com or (408) 955-1690
TERMINATION RECOMMENDATIONS
R2
82
R2
82
Z
O
= 50
Z
O
= 50
+3.3V
+3.3V
V
t
= V
CC
—2V
R1
130
R1
130
+3.3V
Figure 1. Parallel Termination–Thevenin Equivalent
Note:
1.
For +5.0V systems: R1 = 82
, R2 = 130
.
Z = 50
Z = 50
50
50
50
+3.3V
+3.3V
source
destination
Rb
C1 (optional)
0.01
μ
F
Figure 2. Three-Resistor “Y–Termination”
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
. For +3.3V systems R
b
= 46
to 50
. For +5V systems, R
b
= 110
.
+3.3V
+3.3V
Z
O
= 50
R2
82
+3.3V
+3.3V
R1
130
R1
130
R2
82
V
t
= V
CC
—2V
Q
/Q
50
+3.3V
0.01
μ
F
V
BB
Figure 3. Terminating Unused I/O
Notes:
1. Unused output (/Q) must be terminated to balance the output.
2. Micrel's differential I/O logic devices include a V
BB
reference pin .
3. Connect unused input through 50
to V
BB
. Bypass with a 0.01
μ
F capacitor to V
CC
, not GND, as PECL is referenced to V
CC
.
4. For +2.5V systems: R1 = 250
, R2 = 62.5
.
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