CY28439
AC Electrical Specifications (continued)
Parameter
TSKEW
Description
Condition
Measurement at 1.5V
Min.
Max.
500
Unit
ps
Any PCI clock to Any PCI clock Skew
PCIF and PCI Cycle to Cycle Jitter
–
–
TCCJ
Measurement at 1.5V
500
ps
DOT
TDC
DOT96T and DOT96C Duty Cycle
DOT96T and DOT96C Period
Measured at crossing point VOX
Measured at crossing point VOX
45
55
%
TPERIOD
TPERIODAbs
TCCJ
10.41354 10.41979 ns
10.16354 10.66979 ns
DOT96T and DOT96C Absolute Period Measured at crossing point VOX
DOT96T/C Cycle to Cycle Jitter
DOT96T/C Long Term Accuracy
Long Term jitter
Measured at crossing point VOX
Measured at crossing point VOX
–
–
–
250
100
700
ps
ppm
ps
LACC
TLTJ
Measurement taken from cross point
VOX @1 Ps
Measurement taken from cross point
VOX @10ꢀPs
–
700
ps
TR / TF
TRFM
DOT96T and DOT96C Rise and Fall Times Measured from VOL = 0.175 to VOH = 0.525V
130
–
700
20
ps
%
Rise/Fall Matching
Determined as a fraction of
2*(TR – TF)/(TR + TF)
'TR
Rise Time Variation
–
–
125
125
850
–
ps
ps
'TF
Fall Time Variation
VHIGH
VLOW
VOX
Voltage High
Math averages Figure 10
Math averages Figure 10
660
–150
250
–
mV
mV
mV
V
Voltage Low
Crossing Point Voltage at 0.7V Swing
Maximum Overshoot Voltage
550
VOVS
VHIGH
0.3
+
VUDS
VRB
Minimum Undershoot Voltage
Ring Back Voltage
–0.3
–
–
V
V
See Figure 10. Measure SE
0.2
USB48, 24_48M
TDC
USB Duty Cycle
Measurement at 1.5V
45
55
%
TPERIOD
USB Period,
USB Period
24M Period
24M Period
Long Accuracy
Measurement at 1.5V, mean value over 20.83125 20.83542 ns
1 Ps
TPERIODabs
TPERIOD24
TPERIOD24abs
LACC
Measurement at 1.5V, max. and min.
values over 1 Ps
20.48125 21.18542 ns
Measurement at 1.5V, mean value over 41.67083 41.66250 ns
1 Ps
Measurement at 1.5V, max. and min.
values over 1 Ps
41.57083 41.76250 ns
Measured at 1.5V using frequency
counter over 0.15s
–
100
ppm
THIGH
USB high time (High drive)
USB low time (High drive)
24M high time (High drive)
24M low time (High drive)
Rising edge rate (High drive)
Falling edge rate (High drive)
Measurement at 2.0V
8.094
7.694
16.188
15.388
1.0
10.9
11.5
22.7
22.6
3.0
ns
ns
TLOW
Measurement at 0.8V
THIGH24
TLOW24
Edge rate
Edge rate
TCCJ
Measurement at 2.0V
ns
Measurement at 0.8V
ns
Measured between 0.8V and 2.0V
Measured between 0.8V and 2.0V
V/ns
V/ns
ps
1.0
3.0
USB Cycle to Cycle Jitter (High drive) Measurement taken@1.5V waveform
24_48M Cycle to Cycle Jitter (High drive) Measurement taken@1.5V waveform
–
300
350
700
–
ps
TLTJ
Long Term jitter
Measurement taken from cross point
VOX @ 1 Ps
–
ps
Rev 1.0,November 21, 2006
Page 18 of 21
SPECTRALINEAR [ SPECTRALINEAR INC ]
