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CY28409 Datasheet(PDF) 14 Page - Cypress Semiconductor

Part No. CY28409
Description  Clock Synthesizer with Differential SRC and CPU Outputs
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Maker  CYPRESS [Cypress Semiconductor]
Homepage  http://www.cypress.com
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CY28409 Datasheet(HTML) 14 Page - Cypress Semiconductor

 
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CY28409
Document #: 38-07445 Rev. *B
Page 14 of 18
AC Electrical Specifications
Parameter
Description
Condition
Min.
Max.
Unit
Crystal
TDC
XIN Duty Cycle
The device will operate reliably with input duty
cycles up to 30/70 but the REF clock duty cycle
will not be within specification
47.5
52.5
%
TPERIOD
XIN Period
When XIN is driven from an external clock
source
69.841
71.0
ns
TR / TF
XIN Rise and Fall Times
Measured between 0.3VDD and 0.7VDD
–10.0
ns
TCCJ
XIN Cycle to Cycle Jitter
As an average over 1-
µs duration
500
ps
LACC
Long-term Accuracy
Over 150 ms
300
ppm
CPU at 0.7V
TDC
CPUT and CPUC Duty Cycle
Measured at crossing point VOX
45
55
%
TPERIOD
100-MHz CPUT and CPUC Period
Measured at crossing point VOX
9.9970
10.003
ns
TPERIOD
133-MHz CPUT and CPUC Period
Measured at crossing point VOX
7.4978
7.5023
ns
TPERIOD
200-MHz CPUT and CPUC Period
Measured at crossing point VOX
4.9985
5.0015
ns
TSKEW
Any CPUT/C to CPUT/C Clock Skew
Measured at crossing point VOX
100
ps
TCCJ
CPUT/C Cycle to Cycle Jitter
Measured at crossing point VOX
125
ps
TR / TF
CPUT and CPUC Rise and Fall Times
Measured from VOL = 0.175 to VOH = 0.525V
175
700
ps
TRFM
Rise/Fall Matching
Determined as a fraction of 2*(TR – TF)/(TR + TF)–
20
%
∆T
R
Rise Time Variation
125
ps
∆T
F
Fall Time Variation
125
ps
VHIGH
Voltage High
Math averages Figure 11
660
850
mv
VLOW
Voltage Low
Math averages Figure 11
–150
mv
VOX
Crossing Point Voltage at 0.7V Swing
250
550
mv
VOVS
Maximum Overshoot Voltage
VHIGH+0.3 V
VUDS
Minimum Undershoot Voltage
–0.3
V
VRB
Ring Back Voltage
See Figure 11. Measure SE
0.2
V
SRC
TDC
SRCT and SRCC Duty Cycle
Measured at crossing point VOX
45
55
%
TPERIOD
100 MHz SRCT and SRCC Period
Measured at crossing point VOX
9.9970
10.003
ns
TPERIOD
200 MHz SRCT and SRCC Period
Measured at crossing point VOX
4.9985
5.0015
ns
TCCJ
SRCT/C Cycle to Cycle Jitter
Measured at crossing point VOX
125
ps
LACC
SRCT/C Long Term Accuracy
Measured at crossing point VOX
300
ppm
TR / TF
SRCT and SRCC Rise and Fall Times
Measured from VOL = 0.175 to VOH = 0.525V
175
700
ps
TRFM
Rise/Fall Matching
Determined as a fraction of 2*(TR – TF)/(TR + TF)–
20
%
∆T
R
Rise Time Variation
125
ps
∆T
F
Fall Time Variation
125
ps
VHIGH
Voltage High
Math averages Figure 11
660
850
mv
VLOW
Voltage Low
Math averages Figure 11
–150
mv
VOX
Crossing Point Voltage at 0.7V Swing
250
550
mV
VOVS
Maximum Overshoot Voltage
VHIGH+0.3 V
VUDS
Minimum Undershoot Voltage
–0.3
V
VRB
Ring Back Voltage
See Figure 11. Measure SE
0.2
V
3V66
TDC
3V66 Duty Cycle
Measurement at 1.5V
45
55
%
TPERIOD
Spread Disabled 3V66 Period
Measurement at 1.5V
14.9955
15.0045
ns
TPERIOD
Spread Enabled 3V66 Period
Measurement at 1.5V
14.9955
15.0799
ns
THIGH
3V66 High Time
Measurement at 2.0V
4.9500
ns
TLOW
3V66 Low Time
Measurement at 0.8V
4.5500
ns


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