CY24942 Datasheet, PDF (1/19 Pages) Cypress Semiconductor – 25 MHz Crystal or Clock Input

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