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
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
Units
SSC ON
-0.5%
Down
Spread
Center
Freq.
MHz
Center
Freq.
MHz
Notes
Notes
Measurement Windo
Units