Integrated
Circuit
Systems, Inc.
ICS9248-134
Frequency Timing Generator for PENTIUM II/III Systems
Recommended Application:
For Intel Camino Style Chipsets
Pin Configuration
GND
REF0
*SEL24_48#/REF1
VDDREF
X1
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
VDDL
IOAPIC0
IOAPIC1
GND
IOAPIC2
VDDL
OutputFeatures:
•
•
•
•
•
•
•
3 - CPUs @ 2.5V, up to 180MHz.
1 - CPU/2 @ 2.5V.
X2
GND
CPU/2
GND
*FS0/PCICLK_F
*FS1/PCICLK0
VDDPCI
*FS2/PCICLK1
*FS3/PCICLK2
GND
CPUCLK0
VDDL
CPUCLK1
CPUCLK2
GND
VDD66
3V66_0
3V66_1
3V66_2
GND66
SDATA
3 - IOAPIC @ 2.5V, PCI or PCI/2
3 - 3V66MHz @ 3.3V.
11 - PCIs @ 3.3V
PCICLK3
PCICLK4
VDDPCI
PCICLK5
PCICLK6
GND
PCICLK7
PCICLK8
PCICLK9
VDDPCI
1 - 48MHz, @ 3.3V fixed
1 - 24/48MHz, @ 3.3V
SCLK
Features:
VDD48
48MHz/FS4*
24_48MHz
GND48
•
•
•
Support power management: Power down Mode
from I2C programming.
PD#
Spread spectrum for EMI control
± 0.25% center spread).
48-pin SSOP
*120K ohm pull-up to VDD on indicated inputs.
Uses external 14.318MHz crystal
Key Specifications:
Functionality
FS4 FS3 FS2 FS1 FS0
•
•
•
CPU Output Jitter: <250ps
CPU
103.00 34.33
105.00 35.00
PCI
3V66
68.67
70.00
IOAPIC
17.17
17.50
IOAPIC Output Jitter: <500ps
48MHz, 3V66, PCI Output Jitter: <500ps)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
100.45 33.483 66.967 16.742
100.90 33.63 67.27 16.82
107.10 35.700 71.400 17.850
109.00 36.33
112.00 37.34
114.00 28.50
116.00 29.00
118.00 29.50
133.30 33.33
120.00 30.00
122.00 30.50
125.00 31.25
72.67
74.67
57.00
58.00
59.00
66.65
60.00
61.00
62.50
18.17
18.67
14.25
14.50
14.75
16.66
15.00
15.25
15.63
Block Diagram
PLL2
48MHz
24_48MHz
/ 2
X1
X2
XTAL
OSC
REF (1:0)
128.21 32.05 64.105 16.026
130.00 32.50
132.00 33.00
133.90 33.48
138.00 34.50
142.00 35.50
146.00 36.50
150.00 37.50
153.00 38.25
156.00 39.00
159.00 39.75
162.00 40.50
165.00 41.25
168.00 42.00
171.00 42.75
174.00 43.50
177.00 44.25
180.00 45.00
65.00
66.00
66.95
69.00
71.00
73.00
75.00
76.50
78.00
79.50
81.00
82.50
84.00
85.50
87.00
88.50
90.00
16.25
16.50
16.74
17.25
17.75
18.25
18.75
19.13
19.50
19.88
20.25
20.63
21.00
21.38
21.75
22.13
22.50
PLL1
Spread
Spectrum
CPU
DIVDER
CPUCLK (2:0)
CPU/2
/ 2
SEL24_48#
FREQ_APIC
IOAPIC
DIVDER
IOAPIC (2:0)
Control
Logic
SDATA
SCLK
PCI
DIVDER
PCICLK (9:0)
PCICLK_F
FS (4:0)
PD#
Config.
Reg.
3V66
DIVDER
3V66 (2:0)
ICS reserves the right to make changes in the device data identified in
this publication without further notice. ICS advises its customers to
obtain the latest version of all device data to verify that any
9248-134Rev A8/22/00
information being relied upon by the customer is current and accurate.