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Numéro de référence | ICS9248-151 | ||
Description | Frequency Generator & Integrated Buffers | ||
Fabricant | Integrated Circuit Systems | ||
Logo | |||
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
GND
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
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 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
Third party brands and names are the property of their respective owners.
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.
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Pages | Pages 14 | ||
Télécharger | [ ICS9248-151 ] |
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