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CY22801 Datasheet PDF : 7 Pages
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CY22801
These jitter terms are usually given in terms of RMS,
peak-to-peak, or in the case of phase noise, dBC/Hz with respect
to the fundamental frequency. Actual jitter is dependent on
■ XIN jitter and edge rate
■ Number of active outputs
■ Output frequencies
■ Supply voltage
■ Temperature
■ Output load
Power supply noise and clock output loading are two major
system sources of clock jitter. Power supply noise is mitigated by
proper power supply decoupling (0.1-μF ceramic cap) of the
clock and ensuring a low impedance ground to the chip.
Reducing capacitive clock output loading to a minimum lowers
current spikes on the clock edges and thus reduces jitter.
Reducing the total number of active outputs also reduces jitter in
a linear fashion. However, it is better to use two outputs to drive
two loads than one output to drive two loads.
For additional information, refer to the application note, Jitter in
PLL-based Systems: Causes, Effects, and Solutions, available
at http://www.cypress.com.
Cypress Programmable Clocks
Cypress offers a wide range of programmable clock synthesizers
that can generate any other frequencies not covered by the
CY22801. Table 2 summarizes all Cypress programmable
devices including CY22801.
Table 2. Cypress Programmable Clocks[1]
Part #
No. of PLL Input Freq.
Output
Freq.
Package
No. of Spread
Outputs Spectrum
VCXO
I2C
CY22800
1
0.5–100
1–200
8-SOIC
Up to 3
Yes
Yes
No
CY22801
1
1–133
1–200
8-SOIC
Up to 3
No
No
No
CY22050
1
1–133
0.08–200 16-TSSOP Up to 6
No
No
No
CY22150
1
1–133
0.08–200 16-TSSOP Up to 6
No
No
Yes
CY25100
1
8–166
3–200 8-SOIC/TSSOP Up to 2
Yes
No
No
CY25200
1
3–166
3–200
16-TSSOP Up to 6
Yes
No
No
CY241V08
1
27/13.5
27/13.5
8-SOIC
Up to 2
No
Yes
No
CY22392
3
1–166
1–200
16-TSSOP Up to 6
No
No
No
CY22381
3
1–166
1–200
8-SOIC
Up to 3
No
No
No
CY22393
3
1–166
1–200
16-TSSOP Up to 6
No
No
Yes
CY22394/5
3
1–166
1–200
16-TSSOP Up to 5
No
No
No
CY22388/89/91
4
1–100
4.2–166 16/20-TSSOP, Up to 8
No
32-QFN
Yes
No
Note
1. The CY22800 and CY22801 are programmed using the programming dongle included in the CY36800 InstaClock Kit. The CY3672 programmer are used to
program all other Cypress Programmable Clocks.
Document #: 001-15571 Rev. *B
Page 3 of 7
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