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ICS950602YGT Datasheet

  • ICS950602YGT

  • Programmable Timing Control Hub for PII/III

  • 16頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS950602
Programmable Timing Control Hub鈩?for PII/III鈩?/div>
Recommended Application:
VIA Mobile PL133T and PLE133T Chipsets.
Output Features:
鈥?/div>
2 - CPU clocks @ 2.5V
鈥?/div>
1 - Pairs of differential CPU clocks @ 3.3V
鈥?/div>
7 - PCI including 1 free running @ 3.3V
鈥?/div>
7 - SDRAM @ 3.3V
鈥?/div>
1 - 48MHz @ 3.3V fixed
鈥?/div>
1 - 24_48MHz selectable @ 3.3V
鈥?/div>
2 - REF @ 3.3V, 14.318MHz
Features/Benefits:
鈥?/div>
Programmable output frequency.
鈥?/div>
Programmable output divider ratios.
鈥?/div>
Programmable output rise/fall time.
鈥?/div>
Programmable output skew.
鈥?/div>
Programmable spread percentage for EMI control.
鈥?/div>
Watchdog timer technology to reset system
if system malfunctions.
鈥?/div>
Programmable watch dog safe frequency.
鈥?/div>
Support I
2
C Index read/write and block read/write
operations.
鈥?/div>
Uses external 14.318MHz crystal.
Key Specifications:
鈥?/div>
CPU Output Jitter <200ps
鈥?/div>
CPU Output Skew <175ps
鈥?/div>
PCI to PCI Output Skew <500ps
GND
*FS2/REF1
REF0
Vtt_PWRGD#
VDDREF
GND
X1
X2
VDDPCI
*FS4/PCICLK_F
*FS3/PCICLK0
GND
PCICLK1
PCICLK2
PCICLK3
PCICLK4
PCICLK5
SDRAM_IN
*CPU_STOP#
*PCI_STOP#
*PD#
**MULTISEL
GND
SDATA
Pin Configuration
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
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
CPUCLK0
CPUCLK1
VDDCPU_2.5
VDDCPU_3.3
CPUCLKT
CPUCLKC
GND
RESET#
I REF
SDRAM6
GND
SDRAM0
SDRAM1
VDDSDRAM
SDRAM2
SDRAM3
GND
SDRAM4
SDRAM5
VDDSDRAM
AVDD48
48MHz/FS0*
24_48MHz/FS1*
SCLK
48-Pin SSOP & TSSOP
* Internal Pull-up resistor of 120K to VDD
** these inputs have 120K internal pull-down
to GND
Block Diagram
Host Swing Select Functions
MULTISEL0
0
1
Board Target
Trace/Term Z
50 ohms
50 ohms
Reference R,
Iref = V
DD
/(3*Rr)
Rr = 221 1%,
Iref = 5.00mA
Rr = 475 1%,
Iref = 2.32mA
Output
Current
Ioh = 4* I REF
Ioh = 6* I REF
Voh @ Z
1.0V @ 50
0.7V @ 50
0469B鈥?2/18/02
ICS950602

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