9FG430_17 Datasheet, PDF (3/18 Pages) Integrated Device Technology – Four Output Differential Frequency Generator for PCIe Gen3 and QPI

9FG430
Four Output Differential Frequency Generator for PCIe Gen3 and QPI
Pin Description
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PIN NAME
XIN/CLKIN
X2
VDD
GND
REFOUT
vFS2
DIF_3
DIF_3#
VDD
GND
DIF_2
DIF_2#
SDATA
SCLK
DIF_STOP#
16
vSPREAD
PIN TYPE
IN
OUT
PWR
PWR
OUT
IN
OUT
OUT
PWR
PWR
OUT
OUT
I/O
IN
IN
IN
17
^SEL14M_25M#
IN
18
DIF_1#
19
DIF_1
20
GND
21
VDD
22
DIF_0#
23
DIF_0
24
vFS1
25
vFS0
OUT
OUT
PWR
PWR
OUT
OUT
IN
IN
26
IREF
OUT
27
GNDA
PWR
28
VDDA
PWR
Note:
^ indicates internal 120K pull up
v indicates internal 120K pull down
DESCRIPTION
Crystal input or Reference Clock input
Crystal output, Nominally 14.318MHz
Power supply, nominal 3.3V
Ground pin.
Reference Clock output
Frequency select pin. This pin has an internal 120k pull down resistor
0.7V differential true clock output
0.7V differential Complementary clock output
Power supply, nominal 3.3V
Ground pin.
0.7V differential true clock output
0.7V differential Complementary clock output
Data pin for SMBus circuitry, 5V tolerant.
Clock pin of SMBus circuitry, 5V tolerant.
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
0.7V differential Complementary clock output
0.7V differential true clock output
Ground pin.
Power supply, nominal 3.3V
0.7V differential Complementary clock output
0.7V differential true clock output
Frequency select pin.
Frequency select pin.
This pin establishes the reference for the differential current-mode output pairs. It
requires a fixed precision resistor to ground. 475ohm is the standard value for
100ohm differential impedance. Other impedances require different values. See
data sheet.
Ground pin for the PLL core.
3.3V power for the PLL core.
IDT^® Four Output Differential Frequency Generator for PCIe Gen3 and QPI
3
1681D—04/04/17