參數(shù)資料
型號(hào): SY58012UMG
廠商: MICREL INC
元件分類(lèi): 時(shí)鐘及定時(shí)
英文描述: 5GHz, 1:2 LVPECL FANOUT BUFFER/TRANSLATOR
中文描述: 58012 SERIES, LOW SKEW CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), QCC16
封裝: 3 X 3 MM, LEAD FREE, MLF-16
文件頁(yè)數(shù): 8/9頁(yè)
文件大小: 142K
代理商: SY58012UMG
8
Precision Edge
SY58012U
Micrel, Inc.
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
Part Number
Function
Data Sheet Link
SY58011U
7GHz, 1:2 CML Fanout Buffer/Translator
With Internal Input Termnations
http://www.micrel.com/product-info/products/sy58011u.shtml
SY58012U
5GHz, 1:2 LVPECL Fanout Buffer/Translator
With Internal Input Termination
http://www.micrel.com/product-info/products/sy58012u.shtml
SY58013U
6GHz, 1:2 Fanout Buffer/Translator w/400mV
LVPECL Outputs and Internal Terminations
http://www.micrel.com/product-info/products/sy58013u.shtml
16-MLF
Manufacturing Guidelines
Exposed Pad Application Note
www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf
M-0317
HBW Solutions
http://www.micrel.com/product-info/as/solutions.shtml
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
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 5. Parallel Termination-Thevenin Equivalent
Note 1.
Note 2.
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 6. 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 +2.5V systems R
b
= 19
.
For +3.3V systems R
b
= 46
to 50
.
C1 is an optional bypass capacitor intended to compensate for any
t
r
/t
f
mismatches.
Note 4.
LVPECL OUTPUT
+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
R4
1k
R3
1.6k
V
T
= V
CC
1.3V
Figure 7. Terminating Unused I/O
Note 1.
Note 2.
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
.
For +3.3V systems: R1 = 130
, R2 = 82
, R3 = 1k
, R4 = 1.6k
.
Unused output pairs (Q and /Q) may be left floating.
Note 3.
LVPECL output have 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
in terminating the LVPECL output, as shown in Figures 5
through 7.
相關(guān)PDF資料
PDF描述
SY58012UMGTR 5GHz, 1:2 LVPECL FANOUT BUFFER/TRANSLATOR
SY58013U_07 6GHz, 1:2 FANOUT BUFFER/TRANSLATOR w/400mV LVPECL OUTPUTS and INTERNAL INPUT TERMINATION
SY58013U 6GHz, 1:2 FANOUT BUFFER/TRANSLATOR w/400mV LVPECL OUTPUTS and INTERNAL INPUT TERMINATION
SY58013UMG 6GHz, 1:2 FANOUT BUFFER/TRANSLATOR w/400mV LVPECL OUTPUTS and INTERNAL INPUT TERMINATION
SY58013UMGTR 6GHz, 1:2 FANOUT BUFFER/TRANSLATOR w/400mV LVPECL OUTPUTS and INTERNAL INPUT TERMINATION
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SY58012UMITR 制造商:MICREL 制造商全稱(chēng):Micrel Semiconductor 功能描述:5GHz, 1:2 LVPECL FANOUT BUFFER/TRANSLATOR WITH INTERNAL INPUT TERMINATION