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ICS951411YGLFT

Description
System Clock Chip for ATI RS400 P4TM-based Systems
File Size197KB,19 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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ICS951411YGLFT Overview

System Clock Chip for ATI RS400 P4TM-based Systems

Integrated
Circuit
Systems, Inc.
ICS951411
System Clock Chip for ATI RS400 P4
TM
-based Systems
Recommended Application:
ATI RS400 systems using Intel P4
TM
processors
Output Features:
6 - Pairs of SRC/PCI-Express clocks
2 - Pairs of ATIG (SRC/PCI Express*) clocks
3 - Pairs of Intel P4 clocks
3 - 14.318 MHz REF clocks
1 - 48MHz USB clock
1 - 33 MHz PCI clock seed
Key Specifications:
CPU outputs cycle-cycle jitter < 85ps
SRC output cycle-cycle jitter <125ps
PCI outputs cycle-cycle jitter < 250ps
+/- 300ppm frequency accuracy on CPU & SRC clocks
Features/Benefits:
2- Programmable Clock Request pins for SRC clocks
Supports CK410 or CK409 frequency table mapping
Spread Spectrum for EMI reduction
Outputs may be disabled via SMBus
External crystal load capacitors for maximum
frequency accuracy
Functionality - (CK410# = 0)
CPU
SRC
PCI
FS_C
1
FS_B
1
FS_A
1
MHz
MHz
MHz
0
266.66 100.00 33.33
0
1
133.33 100.00 33.33
0
0
200.00 100.00 33.33
1
1
166.66 100.00 33.33
0
333.33 100.00 33.33
0
1
100.00 100.00 33.33
1
0
400.00 100.00 33.33
1
RESERVED
1
Functionality - (CK410# = 1)
FS_C
1
CPU
Byte6 FS_B
1
FS_A
1
MHz
bit5
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
100.00
200.00
133.33
166.67
200.00
400.00
266.67
333.33
SRC
MHz
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
PCI
MHz
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.33
Pin Configuration
REF
MHz
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
U
SB
MHz
48.000
48.000
48.000
48.000
48.000
48.000
48.000
48.000
0
1
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
48.000
48.000
48.000
48.000
48.000
48.000
48.000
48.000
1. FS_C, FS_B and FS_A are low-threshold inputs. Please see the V
IL_FS
and V
IH_FS
specifications in the Input/Supply/Common Output Parameters Table for correct values.
Note:
Pins preceeded by '**' have a 120 Kohm Internal Pull Down resistor
Pins preceeded by '*' have a 120 Kohm Internal Pull Up resistor
56-pin SSOP & TSSOP
0891E—03/07/05
*Other names and brands may be claimed as the property of others.
ICS951411
REF
MHz
U
SB
MHz
X1
X2
VDD48
USB_48MHz
GND
VTT_PWRGD#/PD
SCLK
SDATA
**FS_C
**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
**FS_A/REF0
**FS_B/REF1
**TEST_SEL/REF2
VDDPCI
**CK410#/PCICLK0
GNDPCI
*CPU_STOP#
CPUCLKT0
CPUCLKC0
VDDCPU
GNDCPU
CPUCLKT1
CPUCLKC1
CPUCLKT2_ITP
CPUCLKC2_ITP
VDDA
GNDA
IREF
GNDSRC
VDDSRC
SRCCLKT0
SRCCLKC0
VDDATI
GNDATI
ATIGCLKT0
ATIGCLKC0

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