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ICS9FG108D

Frequency Generator



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ICS9FG108D pdf
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
DATASHEET
ICS9FG108D
Description
ICS9FG108D is a Frequency Timing Generator that provides 8
differential output pairs that are compliant to the Intel CK410
specification. It also provides support for PCI-Express, next
generation I/O, and SATA. The part synthesizes several output
frequencies from either a 14.31818 MHz crystal or a 25 MHz crystal.
The device can also be driven by a reference input clock instead of
a crystal. It provides outputs with cycle-to-cycle jitter of less than 50
ps and output-to-output skew of less than 65 ps. ICS9FG108D also
provides a copy of the reference clock. Frequency selection can be
accomplished via strap pins or SMBus control.
Key Specifications
Features/Benefits
• Generates common frequencies from 14.318 MHz or
25 MHz
• Crystal or reference input
• 8 - 0.7V current-mode differential output pairs
• Supports Serial-ATA at 100 MHz
• Two spread spectrum modes: 0 to -0.5 down spread
and +/-0.25% center spread
• Unused inputs may be disabled in either driven or Hi-Z
state for power management.
• Output cycle-to-cycle jitter < 50 ps
• Output to output skew < 65 ps
• +/-300 ppm frequency accuracy on output clocks
• +/-50 ppm at any frequency with spread off
Functional Block Diagram
XIN/CLKIN
X2
OE(7:0)
OSC
PROGRAMMABLE
SPREAD PLL
STOP
LOGIC
8
R EFOU T
DIF(7:0)
SPREAD
SEL14M_25M#
DIF_STOP#
FS(2:0)
SDATA
SCLK
CONTROL
LOGIC
IREF
IDTTM Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
1
1542E 12/16/10



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ICS9FG108D pdf
ICS9FG108D
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
Pin Configuration
XIN/CLKIN 1
X2 2
VDD 3
GND 4
REFOUT 5
vFS2 6
vOE_7 7
DIF_7 8
DIF_7# 9
VDD 10
DIF_6 11
DIF_6# 12
^OE_6 13
VDD 14
GND 15
^OE_5 16
DIF_5 17
DIF_5# 18
VDD 19
DIF_4 20
DIF_4# 21
vOE_4 22
SDATA 23
SCLK 24
48 VDDA
47 GNDA
46 IREF
45 vFS0
44 vFS1
43 vOE_0
42 DIF_0
41 DIF_0#
40 VDD
39 DIF_1
38 DIF_1#
37 ^OE_1
36 VDD
35 GND
34 ^OE_2
33 DIF_2
32 DIF_2#
31 VDD
30 DIF_3
29 DIF_3#
28 vOE_3
27 ^SEL14M_25M#
26 vSPREAD
25 DIF_STOP#
^ indicates internal 120K pull up
v indicates internal 120K pull down
48-pin SSOP & TSSOP
Functionality Table
Frequency Select Table
SEL14M_25M#
(F S 3)
FS2 FS1 FS0 OUTPUT(MHz)
0
000
100.00
0
001
125.00
0
010
133.33
0
011
166.67
0
100
200.00
0
101
266.66
0
110
333.33
0
111
400.00
1
000
100.00
1
001
125.00
1
010
133.33
1
011
166.67
1
100
200.00
1
101
266.66
1
110
333.33
1
111
400.00
Power Groups
Pin Number
VDD
GND
34
10,14,19,31,36,40 15,35
N/A 47
48 47
Description
REFOUT, Digital Inputs, SMBus
DIF Outputs
IREF
Analog VDD & GND for PLL Core
IDTTM Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
2
1542E 12/16/10



Part Number ICS9FG108D
Description Frequency Generator
Maker IDT - IDT
Total Page 18 Pages
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