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9FG430AFLFT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
IDT
®
Four Output Differential Frequency Generator for PCIe Gen3 and QPI 1681D—04/04/17
9FG430
Four Output Differential Frequency Generator for PCIe Gen3 and QPI
7
Common Recommendations for Differential Routing Dimension or Value Unit Figure
L1 length, route as non-coupled 50ohm trace 0.5 max inch 1
L2 length, route as non-coupled 50ohm trace 0.2 max inch 1
L3 length, route as non-coupled 50ohm trace 0.2 max inch 1
Rs 33 ohm 1
Rt 49.9 ohm 1
Down Device Differential Routing
L4 length, route as coupled microstrip 100ohm differential trace 2 min to 16 max inch 1
L4 length, route as coupled stripline 100ohm differential trace 1.8 min to 14.4 max inch 1
Differential Routing to PCI Express Connector
L4 length, route as coupled microstrip 100ohm differential trace 0.25 to 14 max inch 2
L4 length, route as coupled stripline 100ohm differential trace 0.225 min to 12.6 max inch 2
Output Termination and Layout Information
HCSL Output Buffer
L1
L1'
Rs
L2
L2'
Rs
L4'
L4
L3L3'
Rt Rt
PCI Express
Down Device
REF_CLK Input
Figure 1: Down Device Routing
(Test Load)
HCSL Output Buffer
L1
L1'
Rs
L2
L2'
Rs
L4'
L4
L3L3'
Rt Rt
PCI Express
Add-in Board
REF_CLK Input
Figure 2: PCI Express Connector Routing
IDT
®
Four Output Differential Frequency Generator for PCIe Gen3 and QPI 1681D—04/04/17
9FG430
Four Output Differential Frequency Generator for PCIe Gen3 and QPI
8
Vdiff Vp-p Vcm R1 R2 R3 R4 Note
0.45v 0.22v 1.08 33 150 100 100
0.58 0.28 0.6 33 78.7 137 100
0.80 0.40 0.6 33 78.7 none 100 ICS874003i-02 input compatible
0.60 0.3 1.2 33 174 140 100 Standard LVDS
R1a = R1b = R1
R2a = R2b = R2
Termination for LVDS and other Common Differential Signals (figure 3)
HCSL Output Buffer
L1
L1'
R1b
L2
L2'
R1a
L4'
L4
L3
R2a R2b
Down Device
REF_CLK Input
Figure 3
L3'
R3 R4
Component Value Note
R5a, R5b 8.2K 5%
R6a, R6b 1K 5%
Cc 0.1 µF
Vcm 0.350 volts
Termination for Cable AC Coupled Application (figure 4)
PCIe Device
REF_CLK Input
Figure 4
R5a
L4'
L4
3.3 Volts
R5b
R6a R6b
Cc
Cc
9FGxxx REF Output
33
Figure 5. REF Output Test Load
5pF
Zo = 50 ohms
IDT
®
Four Output Differential Frequency Generator for PCIe Gen3 and QPI 1681D—04/04/17
9FG430
Four Output Differential Frequency Generator for PCIe Gen3 and QPI
9
Differential Clock Tolerances x1 = 25MHz
Clock Periods - Differential Outputs with Spread Spectrum Disabled
1 Clock 1us 0.1s 0.1s 0.1s 1us 1 Clock
-c2c jitter
AbsPer
Min
-SSC
Short-Term
Average
Min
- ppm
Long-Term
Average
Min
0 ppm
Period
Nominal
+ ppm
Long-Term
Average
Max
+SSC
Short-
Term
Average
Max
+c2c
jitter
AbsPer
Max
0 100.00 9.95000 10.00000 10.00000 10.00000 10.05000 ns 1,2
0 125.00 7.95000 8.00000 8.00000 8.00000 8.05000 ns 1,2
0 133.33 7.45000 7.50000 7.50000 7.50000 7.55000 ns 1,2
10 166.67 5.94994 5.99994 6.00000 6.00006 6.05006 ns 1,2
0 200.00 4.95000 5.00000 5.00000 5.00000 5.05000 ns 1,2
6 266.67 3.69998 3.74998 3.75000 3.75002 3.80002 ns 1,2
10 333.33 2.94997 2.99997 3.00000 3.00003 3.05003 ns 1,2
0 400.00 2.45000 2.50000 2.50000 2.50000 2.55000 ns 1,2
Clock Periods - Differential Outputs with Spread Spectrum Enabled
1 Clock 1us 0.1s 0.1s 0.1s 1us 1 Clock
-c2c jitter
AbsPer
Min
-SSC
Short-Term
Average
Min
- ppm
Long-Term
Average
Min
0 ppm
Period
Nominal
+ ppm
Long-Term
Average
Max
+SSC
Short-
Term
Average
Max
+c2c
jitter
AbsPer
Max
96 99.75 9.94906 9.99906 10.02406 10.02506 10.02603 10.05103 10.10103 ns 1,2
19 124.69 7.94925 7.99925 8.01925 8.02005 8.02020 8.04020 8.09020 ns 1,2
96 133.00 7.44930 7.49930 7.51805 7.51880 7.51952 7.53827 7.58827 ns 1,2
10 166.25 5.94943 5.99943 6.01443 6.01504 6.01510 6.03010 6.08010 ns 1,2
96 199.50 4.94953 4.99953 5.01203 5.01253 5.01301 5.02551 5.07551 ns 1,2
-98 266.00 3.69965 3.74965 3.75902 3.75940 3.75903 3.76841 3.81841 ns 1,2
10 332.50 2.94972 2.99972 3.00722 3.00752 3.00755 3.01505 3.06505 ns 1,2
96 399.00 2.44977 2.49977 2.50602 2.50627 2.50651 2.51276 2.56276 ns 1,2
1
Guaranteed by desi
g
n and characterization, not 100% tested in production.
SSC OFF
or SSC +/-
0.25%
Center
Spread
Synthesis
Error
(ppm)
2
All ppm specifications are guaranteed with the assumption that the REF output is tuned to the exact target XTAL frequency.
Synthesis
Error
(ppm)
DIF
DIF
Measurement Windo
w
Units
SSC ON
-0.5%
Down
Spread
Center
Freq.
MHz
Center
Freq.
MHz
Notes
Notes
Measurement Windo
w
Units
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

9FG430AFLFT

Mfr. #:
Buy 9FG430AFLFT
Manufacturer:
IDT
Description:
Clock Generators & Support Products PCIE SYNTHESIZER - GEN3, 4 OUTPUT
Lifecycle:
New from this manufacturer.
Delivery:
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