cy28549 SpectraLinear Inc, cy28549 Datasheet - Page 20

• Manufacturer Part Number: cy28549
• Description: Clock Generator For Intel Ck410m
• Manufacturer: SpectraLinear Inc

Document #:xxx-xxxxx Rev **
AC Electrical Specifications
T
ΔT
ΔT
V
V
V
V
V
V
48_M at 3.3V
T
T
T
T
T
T
T
L
27_M at 3.3V
T
T
T
T
T
T
L
REF at 3.3V
T
T
T
T
T
T
L
ENABLE/DISABLE and SET-UP
T
T
T
Parameter
RFM
DC
PERIOD
PERIODAbs
HIGH
LOW
R
CCJ
ACC
DC
PERIOD
HIGH
LOW
R
CCJ
ACC
DC
PERIOD
PERIODAbs
R
SKEW
CCJ
ACC
STABLE
SS
SH
HIGH
LOW
OX
OVS
UDS
RB
/T
/T
/T
R
F
F
F
F
Rise/Fall Matching
Rise Time Variation
Fall Time Variation
Voltage High
Voltage Low
Crossing Point Voltage at 0.7V Swing
Maximum Overshoot Voltage
Minimum Undershoot Voltage
Ring Back Voltage
Duty Cycle
Period
Absolute Period
48_M High time
48_M Low time
Rising and Falling Edge Rate
Cycle to Cycle Jitter
48M Long Term Accuracy
Duty Cycle
Spread Disabled 27M Period
Spread Enabled 27M Period
27_M High time
27_M Low time
Rising and Falling Edge Rate
Cycle to Cycle Jitter
27_M Long Term Accuracy
REF Duty Cycle
REF Period
REF Absolute Period
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
Stopclock Hold Time
Description
(continued)
PRELIMINARY
Determined as a fraction of
2*(T
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measured between 0.8V and 2.0V
Measurement at 1.5V
Math averages Figure 15
Math averages Figure 15
See Figure 15. Measure SE
Measurement at 2.4V
Measurement at 0.4V
Measured between 0.8V and 2.0V
Measured at crossing point V
Measurement at 1.5V
Measurement at 2.0V
Measurement at 0.8V
Measured between 0.8V and 2.0V
Measured at crossing point V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
R
– T
F
)/(T
R
+ T
Condition
F
)
OX
OX
20.83125 20.83542
20.48125 21.18542
68.82033 70.86224
69.8203
27.000
27.000
8.094
7.694
Min.
–150
–0.3
10.5
10.5
10.0
660
250
1.0
1.0
1.0
45
45
45
–
–
–
–
–
–
–
–
–
–
–
–
–
0
CY28549
27.0547
27.0547
69.8622
Page 20 of 23
V
11.100
11.100
Max.
1000
HIGH
125
125
850
550
350
100
500
500
300
0.3
0.2
2.0
4.0
4.0
1.8
20
55
55
50
55
–
–
–
–
–
–
+
V/ns
V/ns
V/ns
Unit
ppm
ppm
ppm
mV
mV
mV
ms
ps
ps
ns
ns
ns
ns
ps
ns
ns
ns
ps
ns
ns
ps
ps
ns
ns
%
%
%
%
V
V
V