ICS9248-128 Datasheet, PDF (1/16 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers

Integrated
Circuit
Systems, Inc.
ICS9248-128
Frequency Generator & Integrated Buffers
Recommended Application:
SIS 530/620 style chipset
Output Features:
• - 3 CPU @ 2.5V/3.3V up to 133.3 MHz.
• - 6 PCI @ 3.3V (including 1 free-running)
• - 13 SDRAMs @ 3.3V up to 133.3MHz.
• - 3 REF @ 3.3V, 14.318MHz
• - 1 clock @ 24/14.3 MHz selectable output for SIO
• - 1 Fixed clock at 48MHz (3.3V)
• - 1 IOAPIC @ 2.5V / 3.3V
Features:
• Up to 133MHz frequency support
• Support power management: CPU, PCI, SDRAM stop and
Power down Mode from I²C programming.
• Spread spectrum for EMI control ( ± 0.25% center spread
& 0 to -0.5% down spread).
• Uses external 14.318MHz crystal
• FS pins for frequency select
Key Specifications:
• CPU – CPU<175ps
• SDRAM – SDRAM < 350ps
• CPU–SDRAM < 500ps
• CPU(early) – PCI : 1-4ns (typ. 2ns)
• PCI – PCI <500ps
Pin Configuration
VDDR/X
1
*MODE/REF0
2
GNDREF
3
X1
4
X2
5
VDDPCI
6
*FS1/PCICLK_F
7
*FS2.PCICLK0
8
GNDPCI
9
PCICLK1
10
PCICLK2
11
PCICLK3
12
PCICLK4
13
VDDPCI
14
SDRAM12
15
GNDSDR
16
*CPU_STOP# /SDRAM11
17
*PCI_STOP# /SDRAM10
18
VDDSD/C
19
*SDRAM_STOP# /SDRAM9
20
*PD# /SDRAM8
21
GNDFIX
22
SDATA
23
SCLK
24
48
VDDLAPIC
47
IOAPIC
46
REF1/SD_SEL#*
45
GNDLAPIC
44
REF2/CPU2.5_3.3#*
43
CPUCLK1
42
VDDLCPU
41
CPUCLK2
40
CPUCLK3
39
GNDCPU
38
SDRAM0
37
SDRAM1
36
VDDSDR
35
SDRAM2
34
SDRAM3
33
GNDSDR
32
SDRAM4
31
SDRAM5
30
VDDSDR
29
SDRAM6
28
SDRAM7
27
GNDSDR
26
48MHz/FS0*
25
SIO/SEL24_14#MHz*
48-Pin SSOP
* Internal Pull-up Resistor of
120K to 3.3V on indicated inputs
Block Diagram
SEL24_14#
X1
X2
MODE
FS(2:0)
CPU3.3#_2.5 ³
SD_SEL#
SDRAM_STOP#
CPU_STOP#
PCI_STOP#
PD#
SDATA
SCLK
PLL2
XTAL
OSC
PLL1
Spread
Spectrum
LATCH
5
POR
Control
Logic
Config.
Reg.
/2
STOP
CPU_STOP
PCI
CLOCK
DIVDER
STOP
PCI_STOP
48MHz
SIO
3 ^REF(2:0)
IOAPIC
3 ^{CPUCLK (3:1)}
13 ^{SDRAM (12:0)}
5 ^{PCICLK (4:0)}
PCICLK_F
Functionality
SD_SEL 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
FS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
FS0
CPU SDRAM
MHZ MHZ
0 90.00 90.00
1 66.70 100.05
0 95.00 63.33
1 100.00 66.66
0 100.00 75.00
1 112.00 74.66
0 124.00 82.66
1 97.00 97.00
0 66.70 66.70
1 75.00 75.00
0 83.30 83.30
1 95.00 95.00
0 100.00 100.00
1 112.00 112.00
0 124.00 124.00
1 133.30 133.30
PCI
MHZ
30.00
33.35
31.66
33.33
30.00
37.33
31.00
32.33
33.35
30.00
33.32
31.66
33.33
37.33
31.00
33.33
Note: REF, IOAPIC = 14.318MHz
9248-128 Rev B 11/16/00
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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.