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ICS9248-134 Datasheet

  • ICS9248-134

  • Frequency Timing Generator for PENTIUM II/III Systems

  • 13頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9248-134
Frequency Timing Generator for PENTIUM II/III Systems
Recommended Application:
For Intel Camino Style Chipsets
Output Features:
鈥?3 - CPUs @ 2.5V, up to 180MHz.
鈥?1 - CPU/2 @ 2.5V.
鈥?3 - IOAPIC @ 2.5V, PCI or PCI/2
鈥?3 - 3V66MHz @ 3.3V.
鈥?11 - PCIs @ 3.3V
鈥?1 - 48MHz, @ 3.3V fixed
鈥?1 - 24/48MHz, @ 3.3V
Features:
鈥?Support power management: Power down Mode
from I
2
C programming.
鈥?/div>
鈥?/div>
Spread spectrum for EMI control
鹵 0.25% center spread).
Uses external 14.318MHz crystal
Pin Configuration
GND
REF0
*SEL24_48#/REF1
VDDREF
X1
X2
GND
*FS0/PCICLK_F
*FS1/PCICLK0
VDDPCI
*FS2/PCICLK1
*FS3/PCICLK2
GND
PCICLK3
PCICLK4
VDDPCI
PCICLK5
PCICLK6
GND
PCICLK7
PCICLK8
PCICLK9
VDDPCI
PD#
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
CPU/2
GND
CPUCLK0
VDDL
CPUCLK1
CPUCLK2
GND
VDD66
3V66_0
3V66_1
3V66_2
GND66
SDATA
SCLK
VDD48
48MHz/FS4*
24_48MHz
GND48
48-pin SSOP
*120K ohm pull-up to VDD on indicated inputs.
Key Specifications:
鈥?CPU Output Jitter: <250ps
鈥?/div>
鈥?/div>
IOAPIC Output Jitter: <500ps
48MHz, 3V66, PCI Output Jitter: <500ps)
Functionality
FS4
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
FS3 FS2
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
FS1
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
FS0
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
CPU
103.00
105.00
100.45
100.90
107.10
109.00
112.00
114.00
116.00
118.00
133.30
120.00
122.00
125.00
128.21
130.00
132.00
133.90
138.00
142.00
146.00
150.00
153.00
156.00
159.00
162.00
165.00
168.00
171.00
174.00
177.00
180.00
PCI
3V 66
34.33
68.67
35.00
70.00
33.483 66.967
33.63
67.27
35.700 71.400
36.33
72.67
37.34
74.67
28.50
57.00
29.00
58.00
29.50
59.00
33.33
66.65
30.00
60.00
30.50
61.00
31.25
62.50
32.05 64.105
32.50
65.00
33.00
66.00
33.48
66.95
34.50
69.00
35.50
71.00
36.50
73.00
37.50
75.00
38.25
76.50
39.00
78.00
39.75
79.50
40.50
81.00
41.25
82.50
42.00
84.00
42.75
85.50
43.50
87.00
44.25
88.50
45.00
90.00
IOAPIC
17.17
17.50
16.742
16.82
17.850
18.17
18.67
14.25
14.50
14.75
16.66
15.00
15.25
15.63
16.026
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
Block Diagram
PLL2
/2
X1
X2
XTAL
OSC
PLL1
Spread
Spectrum
48MHz
24_48MHz
REF (1:0)
CPU
DIVDER
CPUCLK (2:0)
/2
CPU/2
SEL24_48#
FREQ_APIC
SDATA
SCLK
FS (4:0)
PD#
Control
Logic
Config.
Reg.
IOAPIC
DIVDER
IOAPIC (2:0)
PCI
DIVDER
PCICLK (9:0)
PCICLK_F
3V66
DIVDER
3V66 (2:0)
9248-134 Rev A 8/22/00
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
information being relied upon by the customer is current and accurate.
ICS9248-134

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