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CY28409_06 Datasheet, PDF (14/17 Pages) Cypress Semiconductor – Clock Synthesizer with Differential SRC and CPU Outputs
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AC Electrical Specifications (continued)
Parameter
Description
TR / TF
TSKEW
TCCJ
DOT
PCIF and PCI rise and fall times
Any PCI clock to Any PCI clock Skew
PCIF and PCI Cycle to Cycle Jitter
TDC
TPERIOD
TSKEW
THIGH
TLOW
TR / TF
TCCJ
USB
Duty Cycle
Period
Any 48-MHz to 48-MHz Clock Skew
USB high time
USB low time
Rise and Fall Times
Cycle to Cycle Jitter
TDC
TPERIOD
TSKEW
THIGH
TLOW
TR / TF
TCCJ
REF
Duty Cycle
Period
Any 48-MHz to 48-MHz Clock Skew
USB high time
USB low time
Rise and Fall Times
Cycle to Cycle Jitter
TDC
REF Duty Cycle
TPERIOD REF Period
TSKEW
Any REF to REF Clock Skew
TR / TF REF Rise and Fall Times
TCCJ
REF Cycle to Cycle Jitter
ENABLE/DISABLE and SET-UP
TSTABLE
TSS
TSH
Clock Stabilization from Power-up
Stopclock Set-up Time
Stopclock Hold Time
Condition
Measured between 0.8V and 2.0V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measured at crossing point VOX
Measurement at 2.0V
Measurement at 0.8V
Measured between 0.8V and 2.0V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measured at crossing point VOX
Measurement at 2.0V
Measurement at 0.8V
Measured between 0.8V and 2.0V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measured at crossing point VOX
Measured between 0.8V and 2.0V
Measurement at 1.5V
Table 7. Group Timing Relationship and Tolerances
Group
3V66 to PCI
Conditions
3V66 Leads PCI
Offset
Min. Max.
1.5 ns 3.5 ns
Table 8. USB to DOT Phase Offset
Parameter
DOT Skew
USB Skew
VCH SKew
Typical
0°
180°
0°
Value
0.0 ns
0.0 ns
0.0 ns
Tolerance
1000 ps
1000 ps
1000 ps
Table 9. Maximum Lumped Capacitive Output Loads
Clock
Max Load
Unit
PCI Clocks
30
pF
3V66 Clocks
30
pF
USB Clock
20
pF
DOT Clock
10
pF
REF Clock
30
pF
Document #: 38-07445 Rev. *D
CY28409
Min.
0.5
–
–
Max. Unit
2.0
ns
500
ps
250
ps
45
55
%
20.8271 20.8396 ns
–
500
ps
8.994 10.486 ns
8.794 10.386 ns
0.5
1.0
ns
–
350
ps
45
55
%
20.8271 20.8396 ns
–
500
ps
8.094 10.036 ns
7.694 9.836 ns
1.0
2.0
ns
–
350
ps
45
55
%
69.827 69.855 ns
–
500
ps
0.5
2.0
ns
–
1000 ps
–
1.8
ms
10.0
–
ns
0
–
ns
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