ICS9FG108D Datasheet, PDF (4/18 Pages) Integrated Device Technology – Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA

ICS9FG108D
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
Pin Description (continued)
PIN #
25
PIN NAME
DIF_STOP#
PIN TYPE
IN
26
vSPREAD
IN
27
^SEL14M_25M# IN
28
vOE_3
IN
29
DIF_3#
30
DIF_3
31
VDD
32
DIF_2#
33
DIF_2
OUT
OUT
PWR
OUT
OUT
34
^OE_2
IN
35
GND
36
VDD
PWR
PWR
37
^OE_1
IN
38
DIF_1#
39
DIF_1
40
VDD
41
DIF_0#
42
DIF_0
OUT
OUT
PWR
OUT
OUT
43
vOE_0
IN
44
vFS1
IN
45
vFS0
IN
46
IREF
OUT
47
GNDA
PWR
48
VDDA
PWR
Note:
^ indicates internal 120K pull up
v indicates internal 120K pull down
DESCRIPTION
Active low input to stop differential output clocks.
Asynchronous, active high input to enable spread spectrum functionality. This pin has
a 120Kohm pull down resistor.
Select 14.31818 MHz or 25 Mhz input frequency. This pin has an internal 120kohm
pull up resistor.
1 = 14.31818 MHz, 0 = 25 MHz
Active high input for enabling output 3. This pin has an internal 120kohm pull down
resistor.
0 = tri-state outputs, 1= enable outputs
0.7V differential Complementary clock output
0.7V differential true clock output
Power supply, nominal 3.3V
0.7V differential Complementary clock output
0.7V differential true clock output
Active high input for enabling output 2. This pin has in internal 120kohm pull up
resistor.
0 = tri-state outputs, 1= enable outputs
Ground pin.
Power supply, nominal 3.3V
Active high input for enabling output 1. This pin has an internal 120kohm pull up
resistor.
0 = tri-state outputs, 1= enable outputs
0.7V differential Complementary clock output
0.7V differential true clock output
Power supply, nominal 3.3V
0.7V differential Complementary clock output
0.7V differential true clock output
Active high input for enabling output 0. This pin has an internal 120kohm pull down
resistor.
0 = tri-state outputs, 1= enable outputs
3.3V Frequency select latched input pin with internal 120kohm pull down resistor.
3.3V Frequency select latched input pin with internal 120kohm pull down resistor.
This pin establishes the reference current for the differential current-mode output pairs.
This pin requires a fixed precision resistor tied to ground in order to establish the
appropriate current. 475 ohms is the standard value.
Ground pin for the PLL core.
3.3V power for the PLL core.
IDT^TM Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
4
1542E 12/16/10