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ICS951412YFLFT Datasheet

  • ICS951412YFLFT

  • System Clock Chip for ATI RS480 K8-based Systems

  • 281.36KB

  • 19頁(yè)

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS951412
System Clock Chip for ATI RS480 K8-based Systems
Recommended Application:
ATI RS480 systems using AMD K8 processors
Output Features:
鈥?/div>
3 - 14.318 MHz REF clocks
鈥?/div>
1 - USB_48MHz USB clock
鈥?/div>
1 - HyperTransport 66 MHz clock seed
鈥?/div>
1 - PCI 33 MHz clock seed
鈥?/div>
2 - Pairs of AMD K8 clocks
鈥?/div>
6 - Pairs of SRC/PCI Express* clocks
鈥?/div>
2 - Pairs of ATIG (SRC/PCI Express) clocks
Features:
鈥?/div>
2 - Programmable Clock Request pins for SRC
clocks
鈥?/div>
Spread Spectrum for EMI reduction
鈥?/div>
Outputs may be disabled via SMBus
鈥?/div>
External crystal load capacitors for maximum
frequency accuracy
Pin Configuration
X1
X2
VDD48
USB_48MHz
GND
NC
SCLK
SDATA
**FS2
**CLKREQA#
**CLKREQB#
SRCCLKT7
SRCCLKC7
VDDSRC
GNDSRC
SRCCLKT6
SRCCLKC6
SRCCLKT5
SRCCLKC5
GNDSRC
VDDSRC
SRCCLKT4
SRCCLKC4
SRCCLKT3
SRCCLKC3
GNDSRC
ATIGCLKT1
ATIGCLKC1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
VDDREF
GND
**FS0/REF0
**FS1/REF1
REF2
VDDPCI
PCICLK0
GNDPCI
VDDHTT
HTTCLK0
GNDHTT
CPUCLK8T0
CPUCLK8C0
VDDCPU
GNDCPU
CPUCLK8T1
CPUCLK8C1
VDDA
GNDA
IREF
GNDSRC
VDDSRC
SRCCLKT0
SRCCLKC0
VDDATI
GNDATI
ATIGCLKT0
ATIGCLKC0
Note:
Pins preceeded by '**' have a 120 Kohm Internal Pull Down resistor
56 Pin SSOP/TSSOP
Power Groups
Pin Number
VDD
56
51
48
43
14, 21,
32,35
39
3
GND
55
49
46
42
15, 20,
26,31,36
38
5
Description
Xtal, REF
PCICLK output
HTTCLK output
CPU Outputs
SRC outputs
Analog, CPU PLL
USB_48MHz output
Functionality
FS2
0
0
0
0
1
1
1
FS1
0
0
1
1
0
0
1
FS0
0
1
0
1
0
1
1
CPU
MHz
Hi-Z
X
180.00
220.00
100.00
133.33
200.00
HTT
MHz
Hi-Z
X/3
60.00
73.12
66.66
66.66
66.66
PCI
MHz
Hi-Z
X/6
30.00
36.56
33.33
33.33
33.33
0883G鈥?2/08/04
*Other names and brands may be claimed as the property of others.
ICS951412

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