CY24293 Datasheet, PDF (1/10 Pages) Cypress Semiconductor – Two Outputs PCI-Express Clock Generator

CY24293
Two Outputs PCI-Express Clock Generator
Features
■ 25 MHz Crystal or Clock Input
■ Two sets of Differential PCI-Express Clocks
■ Pin Selectable Output Frequencies
■ Supports HCSL or LVDS Compatible Output Levels
■ Spread Spectrum Capability on all Output Clocks with Pin
Selectable Spread Range
■ 16-pin TSSOP Package
■ Operating Voltage 3.3V
■ Commercial and Industrial Operating Temperature Range
Functional Description
CY24293 is a two output PCI-Express clock generator device
intended for networking applications. The device takes 25 MHz
crystal or clock input and provides two pairs of differential outputs
at 25 MHz, 100 MHz, 125 MHz, or 200 MHz for HCSL, and
25 MHz or 100 MHz for the LVDS signaling standard.
The device incorporates Lexmark Spread Spectrum profile for
maximum electromagnetic interference (EMI) reduction. The
spread type and amount can be selected using select pins.
Logic Block Diagram
VDDX
VDDO
XIN/EXCLKIN
(25 MHz)
XOUT
SS0
SS1
S0
S1
OE
Clock Buffer/
Crystal
Oscillator
Control
Logic
PLL Clock
Synthesizer
GNDX
GNDO
PCIE0P
PCIE0N
PCIE1P
PCIE1N
I _REF
R _REF= 475 Ohms 1%
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 001-46117 Rev. *C
• San Jose, CA 95134-1709 • 408-943-2600
Revised April 02, 2009
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