
CY28548
......................Document #: 001-08400 Rev ** Page 27 of 30
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.
TPERIOD
REF Period
Measurement at 1.5V
69.82033
69.86224
ns
TPERIODAbs
REF Absolute Period
Measurement at 1.5V
68.83429
70.84826
ns
THIGH
REF High time
Measurement at 2V
29.97543
38.46654
ns
TLOW
REF Low time
Measurement at 0.8V
29.57543
38.26654
ns
TR / TF
REF Rising and Falling Edge Rate
Measured between 0.8V and 2.0V
1.0
4.0
V/ns
TSKEW
REF Clock to REF Clock
Measurement at 1.5V
–
500
ps
TCCJ
REF Cycle to Cycle Jitter
Measurement at 1.5V
–
1000
ps
LACC
Long Term Accuracy
Measurement at 1.5V
–
100
ppm
ENABLE/DISABLE and SET-UP
TSTABLE
Clock Stabilization from Power-up
–
1.8
ms
TSS
Stopclock Set-up Time
10.0
–
ns
AC Electrical Specifications (continued)
Parameter
Description
Condition
Min.
Max.
Unit
22
Measurement
Point
4 pF
50
22
Measurement
Point
4 pF
50
PCI/USB
L1
L2
L1
L2
L1 = 0.5", L2 = 8"
Figure 14. Single-ended PCI and USB Double Load Configuration
50
15
Measurement
Point
4 pF
50
15
Measurement
Point
4 pF
50
REF
L2
L1
L2
15
Measurement
Point
4 pF
L1
Figure 15. Single-ended REF Triple Load Configuration