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ICS9248-114 fiches techniques PDF

Integrated Circuit Systems - Frequency Generator & Integrated Buffers

Numéro de référence ICS9248-114
Description Frequency Generator & Integrated Buffers
Fabricant Integrated Circuit Systems 
Logo Integrated Circuit Systems 





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ICS9248-114 fiche technique
Integrated
Circuit
Systems, Inc.
ICS9248-114
AMD - K7System Clock Chip
Recommended Application:
VIA K7 style chipset
Output Features:
• 1 - Differential pair open drain CPU clocks
• 1 - Single-ended open drain CPU clock
• 13 - SDRAM @ 3.3V
• 6 - PCI @3.3V,
• 1 - 48MHz, @3.3V fixed.
• 1 - 24/48MHz @ 3.3V
• 2 - REF @3.3V, 14.318MHz.
Features:
• Up to 155MHz frequency support
• Support power management: CPU stop and Power down
Mode from I2C programming.
• Spread spectrum for EMI control (0 to -0.5% down
spread, ± 0.25% center spread).
• Uses external 14.318MHz crystal
Skew Specifications:
• CPUT – CPUC: <200ps
• PCI – PCI: <500ps
• CPU – PCI: <500ps
Pin Configuration
VDD1
REF0/CPU_STOP#*
GND
X1
X2
VDD2
*MODE/PCICLK_F
*FS3/PCICLK0
GND
*SEL24_48#/PCICLK1
PCICLK2
PCICLK3
PCICLK4
VDD2
BUFFER IN
GND
SDRAM11
SDRAM10
VDD3
SDRAM9
SDRAM8
GND
SDATA
SCLK
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 REF1/FS2*
47 GND
46 CPUCLKT1
45 GND
44 CPUCLKC0
43 CPUCLKT0
42 VDDL
41 PD#*
40 SDRAM_OUT
39 GND
38 SDRAM0
37 SDRAM1
36 VDD3
35 SDRAM2
34 SDRAM3
33 GND
32 SDRAM4
31 SDRAM5
30 VDD3
29 SDRAM6
28 SDRAM7
27 VDD4
26 48MHz/FS0*
25 24/48MHz/FS1*
48-Pin 300mil SSOP
* Internal Pull-up Resistor of 120K to VDD
Block Diagram
PLL2
X1
X2
SEL24_48#
SDATA
SCLK
FS (3:0)
PD#
CPU_STOP#
BUFFER IN
XTAL
OSC
PLL1
Spread
Spectrum
Control
Logic
Config.
Reg.
/2
CPU
DIVDER
Stop
PCI
DIVDER
SDRAM
DRIVER
Functionality
48MHz
24_48MHz
REF (1:0)
CPUCLKC0
CPUCLKT (1:0)
PCICLK (4:0)
PCICLK_F
SDRAM (11:0)
SDRAM_OUT
FS3 FS2 FS1 FS0
0000
000 1
00 10
00 11
0 100
0 10 1
0 110
0 111
10 0 0
100 1
10
10
10 11
1 10 0
110 1
1 1 10
1111
CPU
(MHz)
124.00
75.00
83.30
66.80
103.00
112.00
133.30
100.00
120.00
115.00
110.00
105.00
140.00
150.00
124.00
133.30
PCICLK
(MHz)
41.33
37.50
41.65
33.40
34.33
37.33
44.43
33.33
40.00
38.33
36.67
35.00
35.00
37.50
31.00
33.33
9248-114 Rev C 01/24/01
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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