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9DB823BFLFT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
ICS9DB823B
EIGHT OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2 AND QPI
IDT®
EIGHT OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2 AND QPI 10
ICS9DB823B REV F 091812
Clock Periods–Differential Outputs with Spread Spectrum Enabled
Clock Periods–Differential Outputs with Spread Spectrum Disabled
1 Clock 1us 0.1s 0.1s 0.1s 1us 1 Clock
Lg- -SSC -ppm error 0ppm
+
pp
m error
+SSC Lg+
Absolute
Period
Short-term
Average
Long-Term
Average
Period
Long-Term
Average
Short-term
Average
Period
Minimum
Absolute
Period
Minimum
Absolute
Period
Minimum
Absolute
Period
Nominal Maximum Maximum Maximum
DIF 100
9.949 9.999 10.024 10.025 10.026 10.051 10.101
ns 1,2,3
DIF 133
7.449 7.499 7.518 7.519 7.520 7.538 7.588
ns 1,2,4
DIF 166
5.949 5.999 6.014 6.015 6.016 6.031 6.081
ns 1,2,5
DIF 200
4.950 5.000 5.012 5.013 5.013 5.026 5.076
ns 1,2,5
DIF 266
3.700 3.750 3.759 3.759 3.760 3.769 3.819
ns 1,2,5
DIF 333
2.950 3.000 3.007 3.008 3.008 3.015 3.065
ns 1,2,5
DIF 400
2.450 2.500 2.506 2.506 2.507 2.513 2.563
ns 1,2,5
Units
Signal Name
Measurement
Window
Symbol
Notes
Definition
1 Clock 1us 0.1s 0.1s 0.1s 1us 1 Clock
Lg- -SSC -ppm error 0ppm
+
pp
m error
+SSC Lg+
Absolute
Period
Short-term
Average
Long-Term
Average
Period
Long-Term
Average
Short-term
Average
Period
Minimum
Absolute
Period
Minimum
Absolute
Period
Minimum
Absolute
Period
Nominal Maximum Maximum Maximum
DIF 100
9.949 9.999 10.000 10.001 10.051 ns 1,2,3
DIF 133
7.449 7.499 7.500 7.501 7.551 ns 1,2,4
DIF 166
5.949 5.999 6.000 6.001 6.051 ns 1,2,5
DIF 200
4.950 5.000 5.000 5.001 5.051 ns 1,2,5
DIF 266
3.700 3.750 3.750 3.750 3.800 ns 1,2,5
DIF 333
2.950 3.000 3.000 3.000 3.050 ns 1,2,5
DIF 400
2.450 2.500 2.500 2.500 2.550 ns 1,2,5
1
Guaranteed by design and characterization, not 100% tested in production.
3
Driven by SRC output of main clock, PCIe PLL Mode or Bypass mode
4
Driven by CPU output of main clock, QPI PLL Mode or Bypass mode
5
Driven by CPU output of CK410B+/CK420BQ/CK505 main clock,
Bypass mode only
Definition
Signal Name
2
All Long Term Accuracy specifications are guaranteed with the assumption that the input clock complies with CK410B+ accuracy
requirements. The 9DB423/823 itself does not contribute to ppm error.
Notes
Measurement
Window
Units
Symbol
ICS9DB823B
EIGHT OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2 AND QPI
IDT®
EIGHT OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2 AND QPI 11
ICS9DB823B REV F 091812
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
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
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
DIF Reference Clock
ICS9DB823B
EIGHT OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2 AND QPI
IDT®
EIGHT OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2 AND QPI 12
ICS9DB823B REV F 091812
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
Alternative 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
Cable Connected AC Coupled Application (figure 4)
PCIe Device
REF_CLK Input
Figure 4
R5a
L4'
L4
3.3 Volts
R5b
R6a R6b
Cc
Cc
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

9DB823BFLFT

Mfr. #:
Buy 9DB823BFLFT
Manufacturer:
IDT
Description:
Clock Buffer 8 OUTPUT PCIE GEN2 BUFFER w/QPI
Lifecycle:
New from this manufacturer.
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