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ICS9248-150 Datasheet

  • ICS9248-150

  • Frequency Generator for Multi - Processor Servers

  • 155.15KB

  • 10頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9248-150
Frequency Generator for Multi - Processor Servers
Recommended Application:
ServerWorks Grand Champion Systems.
Output Features:
鈥?/div>
8 - Differential CPU Clock Pairs @ 3.3V
鈥?/div>
1 - 3V 33MHz PCI clocks
鈥?/div>
1 - 48MHz clock
鈥?/div>
1 - Inverted 48MHz clock
鈥?/div>
1 - 14.318 reference output
Features:
鈥?/div>
Up to 200MHz frequency support
鈥?/div>
Support power management: Power Down Mode
鈥?/div>
Supports Spread Spectrum modulation: 0 to -0.5% down
spread.
鈥?/div>
Uses external 14.318MHz crystal
鈥?/div>
Select logic for Differential Swing Control, Test mode,
Tristate, Power down, Spread Spectrum.
鈥?/div>
External resistor for current reference
鈥?/div>
FS pins for frequency select
Key Specifications:
鈥?/div>
PCI Output jitter <500ps
鈥?/div>
CPU Output jitter <200ps
鈥?/div>
48MHz Output jitter <350ps
鈥?/div>
REF Output jitter < 1000ps
Pin Configuration
PCICLK
VDD48
FS0/48MHz
FS1/48MHz#
GND48
VDDCPU
CPUCLKT0
CPUCLKC0
GNDCPU
CPUCLKT1
CPUCLKC1
VDDCPU
CPUCLKT2
CPUCLKC2
GNDCPU
CPUCLKT3
CPUCLKC3
VDDCPU
REF
SPREAD#
GNDREF
X1
X2
VDDREF
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
SEL100/133
GNDPCI
VDDA
GNDA
PD#
VDDCPU
CPUCLKT4
CPUCLKC4
GNDCPU
CPUCLKT5
CPUCLKC5
VDDCPU
CPUCLKT6
CPUCLKC6
GNDCPU
CPUCLKT7
CPUCLKC7
VDDCPU
MULTSEL0
MULTSEL1
GND
GNDI REF
I REF
VDDI REF
48-Pin SSOP and TSSOP
Functionality
SEL133/
100
0
0
0
0
1
1
1
1
FS0
0
0
1
1
0
0
1
1
FS1
0
1
0
1
0
1
0
1
Function
PLL2
Block Diagram
48MHz
48MHz#
X1
X2
XTAL
OSC
PLL1
Spread
Spectrum
Active 100MHz
100MHz Test Mode
100MHz Test Mode
Tristate all outputs
Active 133MHz
133MHz Test Mode
Active 200MHz
Reserved
PD#
SPREAD#
MULTSEL(1:0)
SEL100/133
FS(1:0)
Control
Logic
Config.
Reg.
PCI
DIVDER
ICS9248-150
REF
CPU
DIVDER
8
8
CPUCLKT (7:0)
CPUCLKC (7:0)
PCICLK
Analog Power Groups
VDD48, GND48 = 48MHz, PLL2
VDDA=VDD (core supply voltage 3.3V)
GNDA=Ground for core supply
I REF
Digital Power Group
VDDREF, GNDREF = REF, Xtal
9248-150 Rev B 06/12/01
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

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