ICS9248-151 Datasheet, PDF (1/14 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for Celeron & PII/III™

Integrated
Circuit
Systems, Inc.
ICS9248-151
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
VIA Apollo Pro 266 style chipset.
Output Features:
• 3 - CPUs @ 2.5V, up to 200MHz.
• 3 - IOAPIC @ 2.5V, ½ PCI frequency
• 9 - PCI @ 3.3V,
• 1 - 48MHz, @ 3.3V fixed.
• 1 - 24/48MHz @ 3.3V
• 2 - REF @ 3.3V, 14.318MHz.
• 3 - AGP @ 3.3V
Features:
• Up to 200MHz frequency support
• Support power management: PCI, CPU stop
and Power Down.
• Spread spectrum for EMI control (0 to -0.5%, ± 0.25%).
• Uses external 14.318MHz crystal
Skew Specifications:
• CPU – CPU: <175ps
• PCI – PCI: <500ps
• CPU(early)-PCI: Min=1.0ns, Max=2.5ns
• CPU Cycle to cycle jitter: < 250ps
Pin Configuration
VDDREF
1
GND
2
X1
3
X2
4
AVDD48
5
*FS3/48MHz
6
*FS2/24_48MHz
7
GND
8
PCICLK_F
9
PCICLK0
10
PCICLK1
11
GND
12
PCICLK2
13
PCICLK3
14
VDDPCI
15
PCICLK4
16
PCICLK5
17
PCICLK6
18
GND
19
PCICLK7
20
*FS1
21
*FS0
22
AGPCLK0
23
VDDAGP
24
48
REF0
47
REF1/FS4*
46
VDDLAPIC
45
IOAPIC0
44
IOAPIC1
43
GND
42
IOAPIC2
41
VDDLCPU
40
GND
39
CPUCLK0
38
CPUCLK1
37
VDDLCPU
36
GND
35
CPUCLK2/F
34
CPU_STOP#*
33
PCI_STOP#*
32
PD*
31
AVDD
30
GND
29
SDATA
28
SCLK
27
AGPCLK2
26
AGPCLK1
25
GND
48-Pin 300mil SSOP
* Internal Pull-up Resistor of 120K to VDD
Block Diagram
PLL2
X1
XTAL
X2
OSC
PLL1
Spread
Spectrum
FS (4:0)
PD#
PCI_STOP#
CPU_STOP#
SDATA
SCLK
Control
Logic
Config.
Reg.
/2
CPU
DIVDER
Stop
Stop/F
AGP
DIVDER
IOAPIC
DIVDER
PCI
DIVDER
Stop
Functionality
48MHz
24_48MHz
2 ^{REF (1:0)}
2 ^{CPUCLK (1:0)}
CPUCLK2/F
3 ^{AGPCLK (2:0)}
3 ^{IOAPIC (2:0)}
8 ^{PCICLK (7:0)}
PCICLK_F
FS4 FS3 FS2 FS1 FS0
00000
0000 1
000 10
000 11
00 100
00 10 1
00 110
00 111
0 1000
0 100 1
0 10 10
0 10 11
0 1100
0 110 1
0 1110
0 1111
CPU
(MHz)
200.00
190.00
180.00
170.00
166.00
160.00
150.00
145.00
140.00
136.00
130.00
124.00
66.67
100.00
118.00
133.33
AGP
(MHz)
80.00
76.00
72.00
68.00
66.40
64.00
75.00
72.50
70.00
68.00
65.00
62.00
66.67
66.67
78.67
66.67
PCICLK
(MHz)
40.00
38.00
36.00
34.00
33.20
32.00
37.50
36.25
35.00
34.00
32.50
31.00
33.34
33.33
39.33
33.34
9248-151 Rev B 01/29/01
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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.