cy24292 Cypress Semiconductor Corporation., cy24292 Datasheet - Page 12

• Manufacturer Part Number: cy24292
• Description: Four Outputs Pci-express Clock Generator
• Manufacturer: Cypress Semiconductor Corporation.

AC Electrical Characteristics
Unless otherwise stated, V
Table 18. Single-Ended 25 MHz Output
Table 19. Differential 100 MHz, HCSL Terminated Outputs
F
T
T
T
T
T
T
F
SP
SP
T
T
T
ER
ER
V
V
T
T
T
T
T
T
Notes
Parameter
4. Measured with Cload = 15 pF lumped load
5. Measurement taken from differential waveform (PCIEP minus PCIEN). Either single ended probes with math or a differential probe can be used.
6. Phase jitter is determined using data captured on an oscilloscope at a sample rate of 20 GS/sec, for a minimum 100,000 continuous clock periods. This data is then
7. Measured from -150 mV to +150 mV on the differential waveform (derived from PCIEP minus PCIEN). The signal must be monotonic through the measurement region
8. Measurement taken from a single-ended waveform.
9. Measured at crossing point where the instantaneous voltage value of the rising edge of PCIEP equals the falling edge of PCIEN.
10. Refers to the total variation from the lowest crossing point to the highest, regardless of which edge is crossing. Refers to all crossing points for this measurement.
11. Defined as the total variation of all crossing voltages of Rising PCIEP and Falling PCIEN. This is the maximum allowed variance in V
12. PPM refers to parts per million and is a DC absolute period accuracy specification. 1 PPM is 1/1,000,000th of 100.000000 MHz exactly, or 100 Hz. For 300 PPM then
13. Defined as the absolute minimum or maximum instantaneous period. This includes cycle-to-cycle jitter, relative PPM tolerance, and spread spectrum modulation.
14. Measured at the rising 0V point of the differential signal. Skew is the time difference of the rising 0V point between any two differential signal pairs. The measurement
Document Number: 001-46142 Rev. *C
Parameter
OUT
R
F
DC
CCJ
OEPD
LOCK
OUT
CCJ
PHJ
DC
PERIOD AVG
PERIOD ABS
OSKEW ALL
OSKEW P-P
OEPD
LOCK
CROSS
Xdelta
PROFILE
MOD
R
F
processed using the ClockJitter 1.3.0 software from PCISIG, using the PCI_E_1_1 template.
for rise and fall time. The 300 mV measurement window is centered on the differential zero crossing.
we have an error budget of 30 kHz. The period is to be measured with a frequency counter with measurement window set to 100 ms or greater. The ±300 PPM applies
to systems that do not employ Spread Spectrum or that use common clock source. For systems employing Spread Spectrum, there is an additional 2500 PPM nominal
shift in maximum period resulting from the 0.5% down spread, resulting in a maximum average period specification of +2800 PPM.
is taken over 1000 samples, and the average value is used.
[3]
[3]
Output clock frequency, 25M
Output rise time
Output fall time
Output clock duty cycle
Cycle-to-cycle jitter
Output enable from power down reset
Clock stabilization from power up
Output frequency
Spread modulation profile
Spread modulation frequency
Cycle-to-cycle jitter
Peak-to-peak phase jitter
Output clock duty cycle
Rising edge rate
Falling edge rate
Absolute crossing point voltage
Variation of V
edges
Average clock period accuracy
Absolute clock period
Output skew, all pairs
PCIE0P/N to PCIE3P/N skew and
PCIE1P/N to PCIE2P/N skew
Output enable from power down reset
Clock stabilization from power up
[8,9,11]
DD
= 3.3V ±0.3V, ambient temperature = -40° C to 85° C Industrial, 0 ° C to 70 ° C Commercial, R
CROSS
Description
Description
[4]
[4]
[5,7]
[5,7]
[4]
[5]
over all rising clock
[5,13]
[14]
[4]
[5]
[5,6]
[14]
[5,12]
[8,9,10]
20% to 80% of V
80% to 20% of V
Measured at V
PD_RESET# going high to
99% of final frequency
Measured from 90% of the
applied power supply level
See notes 5 and 7
See notes 5 and 7
See notes 8, 9, and 10
See notes 8, 9, and 11
See notes 5 and 12
See notes 5 and 13
Measured at V
See note 14
Measured at V
See note 14
PD_RESET# going high to
99% of final frequency
Measured from 90% of the
applied power supply level
Test Condition
Condition
DD
CROSS
CROSS
DD
DD
/2
point
point
9.847
0.25
-300
Min
Min
0.6
0.6
45
30
45
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
0.35
Typ
Typ
0.5
0.5
25
50
32
50
CROSS
–
–
1
–
–
–
–
–
–
–
–
–
–
–
–
1
for any particular system.
Lexmark
10.203
2800
Max
Max
0.55
200
100
140
100
4.0
4.0
55
33
90
86
55
50
–
1
1
2
2
2
2
CY24292
Page 12 of 16
REF
= 475 Ω
MHz
MHz
Unit
Unit
type
V/ns
V/ns
ppm
kHz
mV
ms
ms
ms
ms
ns
ns
ps
ps
ps
ns
ps
ps
%
%
V
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