CY28551
....................Document #: 001-05675 Rev. *C Page 24 of 28
USB
TDC
Duty Cycle
Measurement at 1.5V
In High Drive mode
45
55
%
TPERIOD
Period
Measurement at 1.5V
20.83125
20.83542
ns
TPERIODAbs
Absolute Period
Measurement at 1.5V
20.48125
21.18542
ns
THIGH
USB High Time
Measurement at 2.4V
8.094
10.5
ns
TLOW
USB Low Time
Measurement at 0.4V
7.694
10.5
ns
TR/TF
Rising and Falling Edge Rate
Measured between 0.8V and 2.0V
1.0
2.0
V/ns
TCCJ
Cycle-to-cycle Jitter
Measurement at 1.5V
350
ps
LACC
48M Long Term Accuracy
Measured at crossing point VOX
–100
ppm
TLTJ
Long Term Jitter
Measurement taken from cross point
VOX @ 1 s
–1.0
ns
24M
TDC
Duty Cycle
Measurement at 1.5V
In High Drive mode
45
55
%
TPERIOD
Period
Measurement at 1.5V
41.6646
41.6688
ns
THIGH
USB High Time
Measurement at 2.4V
18.8323
ns
TLOW
USB Low Time
Measurement at 0.4V
18.8323
ns
TR/TF
Rising and Falling Edge Rate
Measured between 0.8V and 2.0V
1.0
4.0
V/ns
TCCJ
Cycle-to-cycle Jitter
Measurement at 1.5V
350
ps
LACC
48M Long Term Accuracy
Measured at crossing point VOX
–100
ppm
TLTJ
Long Term jitter
Measurement taken from cross point
VOX @ 1 s
–1.0
ns
REF
TDC
REF Duty Cycle
Measurement at 1.5V
45
55
%
TPERIOD
REF Period
Measurement at 1.5V
69.8203
69.8622
ns
TPERIODAbs
REF Absolute Period
Measurement at 1.5V
68.82033
70.86224
ns
TR/TF
REF Rise and Fall Times Edge rate
Measured between 0.8V and 2.0V
1.0
4.0
V/ns
TCCJ
REF Cycle-to-cycle Jitter
Measurement at 1.5V
1000
ps
TSKEW
REF Clock to REF Clock
Measurement at 1.5V
500
ps
LACC
Long Term Accuracy
Measurement at 1.5V
300
ppm
ENABLE/DISABLE and SET-UP
TSTABLE
Clock Stabilization from Power-up
1.8
ms
AC Electrical Specifications (continued)
Parameter
Description
Condition
Min.
Max.
Unit
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