ICS557-05A Datasheet, PDF (3/12 Pages) Integrated Circuit Systems – Quad Differential PCI-Express Clock Source

ICS557-05A
QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE
PCIE SSCG
Pin Descriptions
Pin
Pin
Pin
Name
Type
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.
IDT™ / ICS™ QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE
3
ICS557-05A REV H 092407