cy28548 SpectraLinear Inc, cy28548 Datasheet - Page 25

• Manufacturer Part Number: cy28548
• Description: Clock Generator For Intel Crestline Chipset
• Manufacturer: SpectraLinear Inc

Rev 1.5 September 16, 2008
AC Electrical Specifications
Test and Measurement Set-up
For PCI Single-ended Signals and Reference
The following diagram shows the test load configurations for
the single-ended PCI, USB, and REF output signals.
T
T
T
T
T
T
L
ENABLE/DISABLE and SET-UP
T
T
ACC
PERIODAbs
HIGH
LOW
R
SKEW
CCJ
STABLE
SS
Parameter
/ T
F
REF Absolute Period
REF High time
REF Low time
REF Rising and Falling Edge Rate
REF Clock to REF Clock
REF Cycle to Cycle Jitter
Long Term Accuracy
Clock Stabilization from Power-up
Stopclock Set-up Time
PCI/USB
REF
Figure 14. Single-ended PCI and USB Double Load Configuration
Description
Figure 15. Single-ended REF Triple Load Configuration
(continued)
L
L
1
1
L1
L1
L1
L1 = 0.5", L2 = 8"
22Ω
22Ω
15Ω
15Ω
15Ω
Measurement at 1.5V
Measurement at 2V
Measurement at 0.8V
Measured between 0.8V and 2.0V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
50Ω
50Ω
L
L
50Ω
2
2
50Ω
50Ω
L
L
L
2
2
2
Condition
4 pF
4 pF
4 pF
4 pF
4 pF
Measurement
Measurement
Measurement
Measurement
Measurement
Point
Point
Point
Point
Point
68.83429
29.97543
29.57543
Min.
10.0
1.0
–
–
–
–
CY28548
70.84826
38.46654
38.26654
Page 25 of 30
Max.
1000
500
100
4.0
1.8
–
V/ns
Unit
ppm
ms
ps
ps
ns
ns
ns
ns