GS4915 Data Sheet

39145 - 3

November 2007

3 of 26

Contents

Key Features.................................................................................................................1

Applications...................................................................................................................1

Description ....................................................................................................................1

Functional Block Diagram .............................................................................................2

1. Pin Out ......................................................................................................................4

1.1 Pin Assignment ...............................................................................................4

1.2 Pin Descriptions ..............................................................................................5

2. Electrical Characteristics...........................................................................................8

2.1 Absolute Maximum Ratings ............................................................................8

2.2 DC Electrical Characteristics ..........................................................................8

2.3 AC Electrical Characteristics .........................................................................10

2.4 Solder Reflow Profiles ...................................................................................11

3. Detailed Description ................................................................................................12

3.1 Functional Overview .....................................................................................12

3.2 Clock Inputs ..................................................................................................12

3.2.1 Differential Clock Input.........................................................................13

3.2.2 Single-Ended Clock Input ....................................................................13

3.2.3 Input Clock Selection ...........................................................................13

3.2.4 Unused Clock Inputs............................................................................13

3.3 Clock Cleaning PLL ......................................................................................13

3.3.1 Phase Detector ....................................................................................14

3.3.2 Charge Pump.......................................................................................14

3.3.3 Loop Filter............................................................................................14

3.3.4 External VCO.......................................................................................15

3.4 Modes of Operation ......................................................................................15

3.4.1 Frequency Modes ................................................................................15

3.4.2 Bypass Modes .....................................................................................17

3.5 Output Clock Frequency and Jitter ...............................................................18

3.6 Output Skew .................................................................................................20

3.7 Clock Outputs ...............................................................................................21

3.7.1 Differential Clock Output......................................................................21

3.7.2 Single-Ended Clock Output .................................................................21

3.8 Device Reset .................................................................................................21

3.8.1 Hardware Reset...................................................................................21

4. Typical Application Circuit .......................................................................................22

5. References & Relevant Standards..........................................................................23

6. Package & Ordering Information.............................................................................24

6.1 Package Dimensions ....................................................................................24

6.2 Recommended PCB Footprint ......................................................................25

6.3 Packaging Data .............................................................................................25

6.4 Ordering Information .....................................................................................25

7. Revision History ......................................................................................................26