Clock Generator. CY24292 Datasheet

CY24292 Generator. Datasheet pdf. Equivalent

CY24292 Datasheet
Recommendation CY24292 Datasheet
Part CY24292
Description Four Outputs PCI-Express Clock Generator
Feature CY24292; CY24292 Four Outputs PCI-Express Clock Generator Four Outputs PCI-Express Clock Generator Features .
Manufacture Cypress Semiconductor
Datasheet
Download CY24292 Datasheet




Cypress Semiconductor CY24292
CY24292
Four Outputs PCI-Express Clock Generator
Four Outputs PCI-Express Clock Generator
Features
25 MHz Crystal or Clock Input
Four Differential 100 MHz PCI-Express Clocks
Supports HCSL Compatible Output Levels
One Single-ended 25 MHz Output
Spread Spectrum Capability on all 100 MHz PCI-Express Clock
Outputs
SMBus Interface with Read Back Capability
32-pin QFN Package
Operating Voltage 3.3 V
Commercial and Industrial Operating Temperature Range
Functional Description
CY24292 is a clock generator device intended for PCI-Express
applications. The device includes: four 100 MHz differential
clocks with HCSL Compatible outputs for PCI-Express, and one
single-ended 25 MHz output.
Using a serially programmable SMBus interface, the CY24292
incorporates spread spectrum modulation on all four 100 MHz
outputs. The device incorporates a Lexmark Spread Spectrum
profile for maximum electromagnetic interference (EMI)
reduction. The spread feature or individual outputs can also be
disabled using the SMBus interface.
For a complete list of related documentation, click here.
Logic Block Diagram
VDD
XIN/EXCLKIN
(25 MHz)
XOUT
SCLK
SDATA
PD_RESET#
Clock Buffer/
Crystal
Oscillator
PLL Clock
Synthesizer,
Dividers, Buffers
and
Configuration
Logic
PCIE0P
(100 MHz)
PCIE0N
PCIE1P (100 MHz)
PCIE1N
PCIE2P
(100 MHz)
PCIE2N
PCIE3P
(100 MHz)
PCIE3N
25M (25 MHz)
GND
I REF
R = 475 Ohms 1%
REF
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 001-46142 Rev. *E
• San Jose, CA 95134-1709 • 408-943-2600
Revised December 5, 2014



Cypress Semiconductor CY24292
CY24292
Contents
Pin Configuration ............................................................. 3
Pin Definitions .................................................................. 3
SMBus Serial Data Interface ............................................ 4
Data Protocol .................................................................... 4
Control Registers ............................................................. 6
Application Information ................................................... 8
Crystal Recommendations .......................................... 8
Crystal Loading ........................................................... 8
Calculating Load Capacitors ....................................... 8
Current Source (Iref) Reference Resistor .................... 8
Output Termination ...................................................... 8
PCB Layout Recommendations .................................. 9
Decoupling Capacitors ................................................ 9
PCI-Express Layout Guidelines ...................................... 9
HCSL Compatible Layout Guidelines .......................... 9
Absolute Maximum Ratings .......................................... 10
Recommended Operation Conditions .......................... 10
DC Electrical Characteristics ........................................ 11
AC Electrical Characteristics ........................................ 12
Test and Measurement Setup ........................................ 13
Single-ended Signals ................................................ 13
Differential Signals .................................................... 13
Ordering Information ...................................................... 14
Ordering Code Definitions ......................................... 14
Package Diagram ............................................................ 15
Acronyms ........................................................................ 16
Document Conventions ................................................. 16
Units of Measure ....................................................... 16
Document History Page ................................................. 17
Sales, Solutions, and Legal Information ...................... 19
Worldwide Sales and Design Support ....................... 19
Products .................................................................... 19
PSoC Solutions ......................................................... 19
Document Number: 001-46142 Rev. *E
Page 2 of 19



Cypress Semiconductor CY24292
Pin Configuration
Figure 1. Pin Diagram - 32-pin QFN CY24292
32 31 30 29 28 27 26 25
PCIE1P 1
24 VDD
PCIE1N 2
23 XOUT
GND 3
IREF 4
PCIE2N 5
CY24292
32 Pin QFN
22 XIN/EXCLKIN
21 VDD
20 PD_RESET#
PCIE2P 6
19 GND
GND 7
18 VDD
VDD 8
17 GND
9 10 11 12 13 14 15 16
CY24292
Pin Definitions
Pin Number Pin Name
1 PCIE1P
2 PCIE1N
3 GND
4 IREF
5 PCIE2N
6 PCIE2P
7 GND
8 VDD
9 PCIE3N
10 PCIE3P
11 VDD
12 PCIE0P
13 PCIE0N
14 SCLK
15 SDATA
16 VDD
17 GND
Pin Type
Output
Output
Power
Output
Output
Output
Power
Power
Output
Output
Power
Output
Output
Input
Input
Power
Power
Description
Differential 100 MHz PCI-Express true clock output. High impedance when disabled.
Differential 100 MHz PCI-Express complementary clock output. High impedance when
disabled.
Ground
Current set for all differential clock drivers. Connect 475 resistor to ground.
Differential 100 MHz PCI-Express complementary clock output. High impedance when
disabled.
Differential 100 MHz PCI-Express true clock output. High impedance when disabled.
Ground
3.3 V Power supply
Differential 100 MHz PCI-Express complementary clock output. High impedance when
disabled.
Differential 100 MHz PCI-Express true clock output. High impedance when disabled.
3.3 V Power supply
Differential 100 MHz PCI-Express true clock output. High impedance when disabled.
Differential 100 MHz PCI-Express complementary clock output. High impedance when
disabled.
SMBus clock input
SMBus data input
3.3 V Power supply
Ground
Document Number: 001-46142 Rev. *E
Page 3 of 19







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