參數(shù)資料
型號(hào): SY100EP57VK4ITR
廠商: MICREL INC
元件分類: 通用總線功能
英文描述: 3.3V/5V PECL/ECL 3GHz DIFFERENTIAL 4:1 MULTIPLEXER
中文描述: 100E SERIES, 4 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDSO20
封裝: TSSOP-20
文件頁數(shù): 7/8頁
文件大?。?/td> 214K
代理商: SY100EP57VK4ITR
7
ECL Pro
SY100EP57V
Micrel
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
Note 1.
Note 2.
Note 3.
Power-saving alternative to Thevenin termination.
Place termination resistors as close to destination inputs as possible.
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
Note 1.
Note 2.
Note 3.
Note 4.
Unused output (/Q) must be terminated to balance the output.
Micrel's differential I/O logic devices include a V
BB
reference pin .
Connect unused input through 50
to V
BB
. Bypass with a 0.01
μ
F capacitor to V
CC
, not GND.
For +2.5V systems: R1 = 250
, R2 = 62.5
.
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