ICS557-05A
QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE PCIE SSCG
IDT®
QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE 3
ICS557-05A REV O 112111
Pin Descriptions
Pin Pin
Name
Pin
Typ e
Pin Description
1 VDDXD Power Connect to +3.3 V digital supply.
2 S0 Input Spread spectrum select pin #0. See table above. Internal pull-up resistor.
3 S1 Input Spread spectrum select pin #1. See table above Internal pull-up resistor.
4 S2 Input Spread spectrum select pin #2. See table above. Internal pull-up resistor.
5 X1 Input Crystal connection. Connect to a fundamental mode crystal or clock input.
6 X2 Output Crystal connection. Connect to a fundamental mode crystal or leave open.
7 PD Input Powers down all PLL’s and tri-states outputs when low. Internal pull-up resistor.
8 OE Input Provides output on, tri-states output (High = enable outputs; Low = disable outputs).
Internal pull-up resistor.
9 GND Power Connect to digital ground.
10 IREF Output Precision resistor attached to this pin is connected to the internal current reference.
11 CLKD Output Selectable 100/200 MHz spread spectrum differential Compliment output clock D.
12 CLKD Output Selectable 100/200 MHz spread spectrum differential True output clock D.
13 CLKC Output Selectable 100/200 MHz spread spectrum differential Compliment output clock C.
14 CLKC Output Selectable 100/200 MHz spread spectrum differential True output clock C.
15 VDDODA Power Connect to +3.3 V analog supply.
16 GND Power Connect to analog ground.
17 CLKB Output Selectable 100/200 MHz spread spectrum differential Compliment output clock B.
18 CLKB Output Selectable 100/200 MHz spread spectrum differential True output clock B.
19 CLKA Output Selectable 100/200 MHz spread spectrum differential Compliment output clock A.
20 CLKA Output Selectable 100/200 MHz spread spectrum differential True output clock A.
