PI6C557-05LEX Pericom Semiconductor, PI6C557-05LEX Datasheet - Page 3

• Manufacturer Part Number: PI6C557-05LEX
• Description: Clock Generators & Support Products PCI express Gen 2 4 output clock gen
• Manufacturer: Pericom Semiconductor

Specifications of PI6C557-05LEX

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PI6C557-05
PCIe® 2.0 Clock Generator with 4 HCSL Outputs
Application Information
Output Structures
Decoupling Capacitors
6*IREF
Decoupling capacitors of 0.01μF or 0.1μF must be connected
IREF
=2.3mA
between each VDD pin and the PCB ground plane and placed
as close to the VDD pin as possible.
PI6C557-05 must be isolated from system power supply noise to
perform optimally.
Crystal
Use a 25MHz fundamental mode parallel resonant crystal with
See Output Termination
less than 30PPM of error across temperature.
Sections
R
=475
Ω
R
Current Source (Iref) Reference Resistor - R R
If board target trace impedance is 50-Ohm,
then RR = 475-Ohm providing an IREF of 2.32 mA. The output
current (IOH) is 6*IREF.
Output Termination
The PCI-Express differential clock outputs of the PI6C557-05
are open source drivers and require an external series resistor
and a resistor to ground. These resistor values and their allow-
able locations are shown in detail in the PCI-Express Layout
Guidelines section.
The PI6C557-05 can be configured for LVDS compatible voltage
levels. See the LVDS Compatible Layout Guidelines section.
PS9061
09/17/10
10-0222
3