ics557-03 Integrated Device Technology, ics557-03 Datasheet - Page 2

• Manufacturer Part Number: ics557-03
• Description: Pci-express Clock Source
• Manufacturer: Integrated Device Technology

Pin Assignment
Pin Descriptions
IDT™ / ICS™ PCI-EXPRESS CLOCK SOURCE
Number
ICS557-03
PCI-EXPRESS CLOCK SOURCE
Pin
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
X1/ICLK
GNDXD
SS0
SS1
OE
S1
X2
S0
GNDODA
VDDODA
X1/ICLK
GNDXD
VDDXD
Name
CLK1
CLK1
CLK0
CLK0
16-pin (173 mil) TSSOP
IREF
SS0
SS1
Pin
OE
S0
S1
X2
1
2
3
4
5
6
7
8
Output Crystal connection. Leave unconnected for clock input.
Output Precision resistor attached to this pin is connected to the internal current
Output HCSL complimentary clock output 1.
Output HCSL true clock output 1.
Output HCSL complimentary clock output 0.
Output HCSL true clock output 0.
Power
Power
Power
Power
Type
Input
Input
Input
Input
Input
Input
Pin
16
15
14
13
12
11
10
9
Select pin 0. See Table1. Internal pull-up resistor.
Select pin 1. See Table 1. Internal pull-up resistor.
Spread Select pin 0. See Table 2. Internal pull-up resistor.
Crystal or clock input. Connect to a 25 MHz crystal or single ended clock.
Output enable. Tri-states outputs and device is not shut down. Internal
pull-up resistor.
Connect to ground.
Spread Select pin 1. See Table 2. Internal pull-up resistor.
reference.
Connect to voltage supply +3.3 V for output driver and analog circuits
Connect to ground.
Connect to voltage supply +3.3 V for crystal oscillator and digital circuit.
VDDXD
CLK0
CLK0
GNDODA
VDDODA
CLK1
CLK1
IREF
2
Output Select Table 1 (MHz)
Spread Selection Table 2
SS1
S1
0
0
1
1
0
0
1
1
Pin Description
SS0
S0
0
1
0
1
0
1
0
1
CLK(1:0), CLK(1:0)
Down -0.75
No Spread
No Spread
Spread%
Down -0.5
100M
125M
200M
25M
ICS557-03
PCIE SSCG
REV L 022608