CY22801 Cypress Semiconductor, CY22801 Datasheet - Page 3

• Manufacturer Part Number: CY22801
• Description: Universal Programmable Clock Generator
• Manufacturer: Cypress Semiconductor

Document #: 001-15571 Rev. **
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
Power supply noise and clock output loading are two major
system sources of clock jitter. Power supply noise can be
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
Table 1. Cypress Programmable Clocks
Note
CY22800
CY22801
CY22050
CY22150
CY25100
CY25200
CY241V08
CY22392
CY22381
CY22393
CY22394/5
CY22388/89/91
1. The CY22800 and CY22801 are programmed using the programming dongle included in the CY36800 InstaClock Kit. The CY3672 programmer can be used to
• XIN jitter and edge rate
• Number of active outputs
• Output frequencies
• Supply voltage
• Temperature
• Output load
program all other Cypress Programmable Clocks.
Part #
No. of PLL
1
1
1
1
1
1
1
3
3
3
3
4
Input Freq.
0.5–100
27/13.5
1–133
1–133
1–133
8–166
3–166
1–166
1–166
1–166
1–166
1–100
[1]
0.08–200
0.08–200
4.2–166
Output
27/13.5
1–200
1–200
3–200
3–200
1–200
1–200
1–200
1–200
Freq.
8-SOIC/TSSOP
16/20-TSSOP,
16-TSSOP
16-TSSOP
16-TSSOP
16-TSSOP
16-TSSOP
16-TSSOP
Package
32-QFN
8-SOIC
8-SOIC
8-SOIC
8-SOIC
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 synthe-
sizers that can generate any other frequencies not covered by
the CY22801.
devices including CY22801.
Outputs
up to 3
up to 3
up to 6
up to 6
up to 2
up to 6
up to 2
up to 6
up to 3
up to 6
up to 5
up to 8
Table 1
No. of
summarizes all Cypress programmable
Spectrum
Spread
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
VCXO
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
CY22801
Page 3 of 7
Yes
Yes
I
No
No
No
No
No
No
No
No
No
No
2
C
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