DATASHEET
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
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.
ICS9FG108D
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.
Key Specifications
•
•
•
•
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
OSC
X2
OE(7:0)
R EFO U T
PROGRAMMABLE
SPREAD PLL
STOP
LOGIC
8
DIF(7:0)
SPREAD
SEL14M_25M#
DIF_STOP#
FS(2:0)
SDATA
SCLK
CONTROL
LOGIC
IREF
IDT
TM
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
1542E 12/16/10
1
ICS9FG108D
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
Pin Configuration
XIN/CLKIN
X2
VDD
GND
REFOUT
vFS2
vOE_7
DIF_7
DIF_7#
VDD
DIF_6
DIF_6#
^OE_6
VDD
GND
^OE_5
DIF_5
DIF_5#
VDD
DIF_4
DIF_4#
vOE_4
SDATA
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDDA
GNDA
IREF
vFS0
vFS1
vOE_0
DIF_0
DIF_0#
VDD
DIF_1
DIF_1#
^OE_1
VDD
GND
^OE_2
DIF_2
DIF_2#
VDD
DIF_3
DIF_3#
vOE_3
^SEL14M_25M#
vSPREAD
DIF_STOP#
Functionality Table
Frequency Select Table
SEL14M_25M#
FS2 FS1 FS0 OUTPUT(MHz)
(FS3)
0
0
0
0
100.00
0
0
0
1
125.00
0
0
1
0
133.33
0
0
1
1
166.67
0
1
0
0
200.00
0
1
0
1
266.66
0
1
1
0
333.33
0
1
1
1
400.00
1
0
0
0
100.00
1
0
0
1
125.00
1
0
1
0
133.33
1
0
1
1
166.67
1
1
0
0
200.00
1
1
0
1
266.66
1
1
1
0
333.33
1
1
1
1
400.00
^ indicates internal 120K pull up
v indicates internal 120K pull down
48-pin SSOP & TSSOP
Power Groups
Pin Num ber
VDD
GND
3
4
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
IDT
TM
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
ICS9FG108D
1542E 12/16/10
2
ICS9FG108D
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
Pin Description
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
PIN N A ME
XIN /C LKIN
X2
VD D
GN D
R EFOU T
vFS2
vOE_7
D IF_ 7
D IF_ 7#
VD D
D IF_ 6
D IF_ 6#
^OE_6
VD D
GN D
^OE_5
D IF_ 5
D IF_ 5#
VD D
D IF_ 4
D IF_ 4#
vOE_4
SD ATA
SC LK
PIN TYPE
IN
OU T
PWR
PWR
OU T
IN
IN
OU T
OU T
PWR
OU T
OU T
IN
PWR
PWR
IN
OU T
OU T
PWR
OU T
OU T
IN
I/O
IN
D ESC R IPTION
C rystal inpu t or R e feren ce C lock in put
C rystal outp ut, N om inally 14 .318 MH z
Pow e r supp ly, nom inal 3.3 V
Groun d pin.
R e fere nce C lock o utput
Freq uency se lect pin . This pin has a n internal 1 20k pu ll dow n resistor
Active hig h inp ut for enab ling o utpu t 7. This p in ha s a 120 kohm pull do w n.
0 = tri-sta te ou tputs, 1 = ena ble o utpu ts
0 .7V differe ntial true clock o utpu t
0 .7V differe ntial C o mplem enta ry clock ou tput
Pow e r supp ly, nom inal 3.3 V
0 .7V differe ntial true clock o utpu t
0 .7V differe ntial C o mplem enta ry clock ou tput
Active hig h inp ut for enab ling o utpu t 6. This p in ha s a n inte rna l 120ko hm p ull up .
0 = tri-sta te ou tputs, 1 = ena ble o utpu ts
Pow e r supp ly, nom inal 3.3 V
Groun d pin.
Active hig h inp ut for enab ling o utpu t 5. This p in ha s a n inte rna l 120ko hm p ull up .
0 = tri-sta te ou tputs, 1 = ena ble o utpu ts
0 .7V differe ntial true clock o utpu t
0 .7V differe ntial C o mplem enta ry clock ou tput
Pow e r supp ly, nom inal 3.3 V
0 .7V differe ntial true clock o utpu t
0 .7V differe ntial C o mplem enta ry clock ou tput
Active hig h inp ut for enab ling o utpu t 4. This p in as an internal 1 20koh m pu ll dow n.
0 = tri-sta te ou tputs, 1 = ena ble o utpu ts
D a ta pin fo r SMBus circuitry, 3.3V tolerant.
C lo ck pin of SMBus circu itry, 5V tole rant.
Note:
^ indicates internal 120K pull up
v indic ates internal 120K pull down
IDT
TM
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
1542E 12/16/10
3
ICS9FG108D
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
Pin Description (continued)
PIN #
25
26
27
PIN NAME
DIF_STOP#
vSPREAD
^SEL14M_25M#
PIN TYPE
IN
IN
IN
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.
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Note:
vOE_3
DIF_3#
DIF_3
VDD
DIF_2#
DIF_2
^OE_2
GND
VDD
^OE_1
DIF_1#
DIF_1
VDD
DIF_0#
DIF_0
vOE_0
vFS1
vFS0
IREF
GNDA
VDDA
IN
OUT
OUT
PWR
OUT
OUT
IN
PWR
PWR
IN
OUT
OUT
PWR
OUT
OUT
IN
IN
IN
OUT
PWR
PWR
^ indicates internal 120K pull up
v indicates internal 120K pull down
IDT
TM
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
1542E 12/16/10
4
ICS9FG108D
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
Absolute Max
Symbol
VDD_A
VDD
Ts
Tambient
Tambient
Tcase
ESD prot
Parameter
3.3V Core Supply Voltage
3.3V Logic Supply Voltage
Storage Temperature
Ambient Operating Temp•(Commerical Grade)
Ambient Operating Temp•(Industrial Grade)
Case Temperature
Input ESD protection•human body model
Min
Max
4.6
4.6
150
+70
+85
115
Units
V
V
°
C
°C
°C
°C
V
-65
0
-40
2000
Electrical Characteristics - REF-14.318/25 MHz
T
A
= Tambient, Supply Voltage VDD = 3.3 V +/-5%;
R
S
=33
Ω
, C
L
= 5pF
(unless otherwise specified)
PARAMETER
SYMBOL
CONDITIONS
Long Accuracy
ppm
see Tperiod min-max values
Clock period
T
period
14.318MHz output nominal
25.000MHz output nominal
Clock period
T
period
I
OH
= -1 mA
Output High Voltage
V
OH
I
OL
= 1 mA
Output Low Voltage
V
OL
V
OH
@MIN = 1.0 V,
Output High Current
I
OH
V
OH
@MAX = 3.135 V
V
OL
@MIN = 1.95 V,
Output Low Current
I
OL
V
OL
@MAX = 0.4 V
V
OL
= 0.4 V, V
OH
= 2.4 V
t
rf1COM
Commercial Temp
Rise/Fall Time
V
OL
= 0.4 V, V
OH
= 2.4 V
t
rf1IND
Industrial Temp
V
T
= 1.5 V
Duty Cycle
d
t1
Jitter
Jitter
1
2
MIN
TYP
0
69.8413
40.0000
SPEC
MAX
2.4
0.4
-29
29
0.5
0.5
45
150
250
0.8
0.8
-23
27
2
2
55
200
400
UNITS Notes
ppm
1
ns
1,2
ns
1,2
V
1
V
1
mA
mA
ns
ns
%
ps
ps
1
1
1
1
1
1
1
t
jcyc-cycCOM
t
jcyc-cycIND
V
T
= 1.5 V (commerical)
VT = 1.5 V (industrial)
Guaranteed by design and characterization, not 100% tested in production.
All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REF is at 14.31818 or 25.00
MHz
Electrical Characteristics - Differential Phase Jitter Parameters
T
A
= Commercial and Industrial, Supply Voltage VDD = 3.3 V +/-5%
PARAMETER
Symbol
Conditions
PCIe Gen 1
t
jphasePLL
PCIe Gen 2
t
jphaseLo
10kHz < f < 1.5MHz
PCIe Gen 2
t
jphaseHigh
1.5MHz < f < Nyquist (50MHz)
Jitter, Phase
t
jphQPI
QPI 133MHz 4.8G/6.4Gb,12UI
t
jphFBD3.2G
t
jphFBD4.8G
1
Min
Typ
30
1.2
2.2
0.26/
0.18
1.8
1.4
SPEC
Max
86
3
3.1
0.5
3
2.5
FBD specs
(11 to 33MHz)
FBD specs
(11 to 33MHz)
Units Notes
ps (p-p) 1,2
ps
1,2
(RMS)
ps
1,2
(RMS)
ps
1,3
(RMS)
ps
1
(RMS)
ps
1
(RMS)
Guaranteed by design and characterization, not 100% tested in production.
2
See http://www.pcisig.com for compelte specs
3
First number is 4.8G link speed, second number is 6.4G link speed. From Intel Clock Jit tool 1.5.1
IDT
TM
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
1542E 12/16/10
5
