參數(shù)資料
型號(hào): SY89834UMITR
廠商: MICREL INC
元件分類: 時(shí)鐘及定時(shí)
英文描述: 2.5V/3.3V TWO INPUT , 1GHz LVTTL/CMOS-TO-LVPECL 1:4 FANOUT BUFFER/TRANSLATOR
中文描述: 89834 SERIES, LOW SKEW CLOCK DRIVER, 4 TRUE OUTPUT(S), 4 INVERTED OUTPUT(S), QCC16
封裝: 3 X 3 MM, MLF-16
文件頁(yè)數(shù): 9/10頁(yè)
文件大?。?/td> 105K
代理商: SY89834UMITR
9
PRELIMINARY
Precision Edge
SY89834U
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 4a. Parallel Termination
Thevenin Equivalent
Note 1.
For +2.5V systems: R1 = 250
, R2 = 62.5
For +3.3V systems: R1 = 130
, R2 = 82
Z = 50
Z = 50
50
50
50
+3.3V
+3.3V
source
destination
Rb
C1
0.01
μ
F
(optional)
Figure 4b. 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
= 50
. For +2.5V systems R
b
= 39
.
+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
R3
1k
R4
1.6k
V
t
= V
CC
1.3V
Figure 4c. Terminating Unused LVPECL I/O
Note 1.
Note 2.
Note 3.
Unused output (/Q) must be terminated to balance the output.
For +2.5V systems: R1 = 250
, R2 = 62.5
, R3 = 1.25k
, R4 = 1.2k
.
Unused output pairs (Q and /Q) may be left floating.
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