ICS557-01 Datasheet, PDF (2/10 Pages) Integrated Circuit Systems – PCI-EXPRESS CLOCK SOURCE

Pin Assignment
OE
1
X1
2
X2
3
GND 4
8 _VDD
7 CLK
6 _CLK
5 _IREF
8 Pin (150 mil) SOIC
ICS557-01
PCI-EXPRESS CLOCK SOURCE
Pin Descriptions
Pin
Number
1
Pin
Name
OE
2
X1
3
X2
4
GND
5
IREF
6
CLK
7
CLK
8
VDD
Pin
Type
Pin Description
Input Output Enable signal
(H = outputs are enabled, L = outputs are disabled/tristated).
Internal pull-up resistor.
Input Crystal or clock input. Connect to a 25 MHz crystal or single ended clock.
XO Crystal Connection. Connect to a parallel mode crystal.
Leave floating if clock input.
Power Connect to ground.
Output A 475Ω precision resistor connected between this pin and ground
establishes the external reference current.
Output HCSL differential complementary clock output.
Output HCSL differential clock output.
Power Connect to +3.3 V.
MDS 557-01 F
2
Revision 011606
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