CY28409 Datasheet, PDF (14/18 Pages) Cypress Semiconductor – Clock Synthesizer with Differential SRC and CPU Outputs

CY28409
AC Electrical Specifications
Parameter
Description
Crystal
T_DC
XIN Duty Cycle
T_PERIOD XIN Period
T_R / T_F XIN Rise and Fall Times
T_CCJ
XIN Cycle to Cycle Jitter
L_ACC
Long-term Accuracy
CPU at 0.7V
T_DC
CPUT and CPUC Duty Cycle
T_PERIOD 100-MHz CPUT and CPUC Period
T_PERIOD 133-MHz CPUT and CPUC Period
T_PERIOD 200-MHz CPUT and CPUC Period
T_SKEW Any CPUT/C to CPUT/C Clock Skew
T_CCJ
CPUT/C Cycle to Cycle Jitter
T_R / T_F CPUT and CPUC Rise and Fall Times
T_RFM
Rise/Fall Matching
∆T_R
Rise Time Variation
∆T_F
Fall Time Variation
V_HIGH
Voltage High
V_LOW
Voltage Low
V_OX
Crossing Point Voltage at 0.7V Swing
V_OVS
Maximum Overshoot Voltage
V_UDS
Minimum Undershoot Voltage
V_RB
Ring Back Voltage
SRC
T_DC
SRCT and SRCC Duty Cycle
T_PERIOD 100 MHz SRCT and SRCC Period
T_PERIOD 200 MHz SRCT and SRCC Period
T_CCJ
SRCT/C Cycle to Cycle Jitter
L_ACC
SRCT/C Long Term Accuracy
T_R / T_F SRCT and SRCC Rise and Fall Times
T_RFM
Rise/Fall Matching
∆T_R
Rise Time Variation
∆T_F
Fall Time Variation
V_HIGH
Voltage High
V_LOW
Voltage Low
V_OX
Crossing Point Voltage at 0.7V Swing
V_OVS
Maximum Overshoot Voltage
V_UDS
Minimum Undershoot Voltage
V_RB
Ring Back Voltage
3V66
T_DC
3V66 Duty Cycle
T_PERIOD Spread Disabled 3V66 Period
T_PERIOD Spread Enabled 3V66 Period
T_HIGH
3V66 High Time
T_LOW
3V66 Low Time
Condition
Min.
Max. Unit
The device will operate reliably with input duty
cycles up to 30/70 but the REF clock duty cycle
will not be within specification
When XIN is driven from an external clock
source
Measured between 0.3V_DD and 0.7V_DD
As an average over 1-µs duration
Over 150 ms
47.5
69.841
–
–
52.5 %
71.0 ns
10.0 ns
500 ps
300 ppm
Measured at crossing point V_OX
Measured at crossing point V_OX
Measured at crossing point V_OX
Measured at crossing point V_OX
Measured at crossing point V_OX
Measured at crossing point V_OX
Measured from V_OL = 0.175 to V_OH = 0.525V
Determined as a fraction of 2*(T_R – T_F)/(T_R + T_F)
Math averages Figure 11
Math averages Figure 11
See Figure 11. Measure SE
45
9.9970
7.4978
4.9985
–
–
175
–
–
–
660
–150
250
–
–0.3
–
55
%
10.003 ns
7.5023 ns
5.0015 ns
100 ps
125 ps
700 ps
20
%
125 ps
125 ps
850 mv
–
mv
550 mv
V_HIGH+ 0.3 V
–
V
0.2
V
Measured at crossing point V_OX
Measured at crossing point V_OX
Measured at crossing point V_OX
Measured at crossing point V_OX
Measured at crossing point V_OX
Measured from V_OL = 0.175 to V_OH = 0.525V
Determined as a fraction of 2*(T_R – T_F)/(T_R + T_F)
Math averages Figure 11
Math averages Figure 11
See Figure 11. Measure SE
45
9.9970
4.9985
–
–
175
–
–
–
660
–150
250
–
–0.3
–
55
%
10.003 ns
5.0015 ns
125 ps
300 ppm
700 ps
20
%
125 ps
125 ps
850 mv
–
mv
550 mV
V_HIGH+ 0.3 V
–
V
0.2
V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 2.0V
Measurement at 0.8V
45
55
%
14.9955 15.0045 ns
14.9955 15.0799 ns
4.9500
–
ns
4.5500
–
ns
Document #: 38-07445 Rev. *B
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