Integrated
Circuit
Systems, Inc.
ICS9248-151
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
VIA Apollo Pro 266 style chipset.
Pin Configuration
Output Features:
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDDREF
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
REF0
REF1/FS4*
VDDLAPIC
IOAPIC0
IOAPIC1
GND
IOAPIC2
VDDLCPU
GND
CPUCLK0
CPUCLK1
VDDLCPU
GND
CPUCLK2/F
CPU_STOP#*
PCI_STOP#*
PD*
AVDD
GND
SDATA
SCLK
AGPCLK2
AGPCLK1
GND
•
•
•
•
•
•
•
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
X1
X2
AVDD48
*FS3/48MHz
*FS2/24_48MHz
GND
PCICLK_F
PCICLK0
PCICLK1
GND
PCICLK2
PCICLK3
VDDPCI
PCICLK4
PCICLK5
PCICLK6
GND
PCICLK7
*FS1
*FS0
AGPCLK0
VDDAGP
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(earlyꢀ-PCI: Min=1.0ns, Max=2.5ns
CPU Cycle to cycle jitter: < 250ps
48-Pin 300mil SSOP
Internal Pull-up Resistor of 120K to VDD
*
Block Diagram
Functionality
CPU
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
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
FS4 FS3 FS2 FS1 FS0
PLL2
48MHz
(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
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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
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
24_48MHz
/ 2
X1
X2
XTAL
OSC
REF (1:0)
2
2
PLL1
Spread
Spectrum
CPU
DIVDER
Stop
CPUCLK (1:0)
CPUCLK2/F
Stop/F
AGP
DIVDER
AGPCLK (2:0)
IOAPIC (2:0)
3
3
Control
Logic
FS (4:0)
PD#
IOAPIC
DIVDER
PCI_STOP#
CPU_STOP#
SDATA
Config.
Reg.
66.67
100.00
118.00
133.33
66.67
66.67
78.67
66.67
33.34
33.33
39.33
33.34
PCI
DIVDER
Stop
PCICLK (7:0)
PCICLK_F
8
SCLK
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
9248-151 Rev B 01/29/01
Third party brands and names are the property of their respective owners.
information being relied upon by the customer is current and accurate.