CY22801

Document Number: 001-15571 Rev. *H

Page 2 of 25

Contents

Pin Configurations ........................................................... 3

Pin Definitions .................................................................. 3

External Reference Crystal/Clock Input ......................... 4

Output Clock Frequencies ............................................... 4

VCXO ................................................................................. 4

VCXO Profile ............................................................... 4

Spread Spectrum Clock Generation (SSCG) ................. 4

Spread Percentage ..................................................... 4

Modulation Frequency ................................................. 4

SSON Pin .................................................................... 4

Multifunction Pins ............................................................ 5

Frequency Calculation and Register Definitions ........... 5

Default Startup Condition for the CY22801 .................... 6

Frequency Calculations and Register Definitions

using the Serial (I2C) Interface ........................................ 6

Reference Frequency .................................................. 6

Programmable Crystal Input Oscillator Gain Settings . 6

Using an External Clock as the Reference Input ......... 7

Input Load Capacitors ................................................. 8

PLL Frequency, Q Counter [42H(6..0)] ....................... 8

PLL Frequency, P Counter [40H(1..0)],

[41H(7..0)], [42H(7)] .................................................... 9

PLL Post Divider Options [0CH(7..0)], [47H(7..0)] ....... 9

Charge Pump Settings [40H(2..0)] .............................. 9

Clock Output Settings: CLKSRC – Clock Output

Crosspoint Switch Matrix [44H(7..0)], [45H(7..0)],

[46H(7..6)] ................................................................. 10

Test, Reserved, and Blank Registers ........................ 10

Application Guideline ..................................................... 12

Best Practices for Best Jitter Performance ................ 12

Field Programming the CY22801 .................................. 12

CyClocksRT Software .................................................... 12

Possible Configuration Examples ................................ 12

Informational Graphs ..................................................... 13

Absolute Maximum Conditions ..................................... 14

Recommended Operating Conditions .......................... 14

Recommended Crystal Specifications for

non-VCXO Applications ................................................. 14

Pullable Crystal Specifications for

VCXO Application only .................................................. 14

DC Electrical Specifications .......................................... 15

AC Electrical Characteristics ........................................ 16

Test Circuit ...................................................................... 17

Timing Definitions .......................................................... 17

2-wire Serial (I2C) Interface Timing ............................... 18

Data Valid .................................................................. 18

Data Frame ............................................................... 18

Acknowledge Pulse ................................................... 18

Ordering Information ...................................................... 20

Possible Configurations ............................................. 20

Ordering Code Definitions ......................................... 20

Package Diagram ............................................................ 21

Acronyms ........................................................................ 22

Document Conventions ................................................. 22

Units of Measure ....................................................... 22

Document History Page ................................................. 23

Sales, Solutions, and Legal Information ...................... 25

Worldwide Sales and Design Support ....................... 25

Products .................................................................... 25

PSoC Solutions ......................................................... 25