ICS9248-150 Datasheet, PDF (1/10 Pages) Integrated Circuit Systems – Frequency Generator for Multi - Processor Servers

Integrated
Circuit
Systems, Inc.
ICS9248-150
Frequency Generator for Multi - Processor Servers
Recommended Application:
ServerWorks Grand Champion Systems.
Output Features:
• 8 - Differential CPU Clock Pairs @ 3.3V
• 1 - 3V 33MHz PCI clocks
• 1 - 48MHz clock
• 1 - Inverted 48MHz clock
• 1 - 14.318 reference output
Features:
• Up to 200MHz frequency support
• Support power management: Power Down Mode
• Supports Spread Spectrum modulation: 0 to -0.5% down
spread.
• Uses external 14.318MHz crystal
• Select logic for Differential Swing Control, Test mode,
Tristate, Power down, Spread Spectrum.
• External resistor for current reference
• FS pins for frequency select
Key Specifications:
• PCI Output jitter <500ps
• CPU Output jitter <200ps
• 48MHz Output jitter <350ps
• REF Output jitter < 1000ps
Pin Configuration
PCICLK
1
VDD48
2
FS0/48MHz
3
FS1/48MHz#
4
GND48
5
VDDCPU
6
CPUCLKT0
7
CPUCLKC0
8
GNDCPU
9
CPUCLKT1
10
CPUCLKC1
11
VDDCPU
12
CPUCLKT2
13
CPUCLKC2
14
GNDCPU
15
CPUCLKT3
16
CPUCLKC3
17
VDDCPU
18
REF
19
SPREAD#
20
GNDREF
21
X1
22
X2
23
VDDREF
24
48
SEL100/133
47
GNDPCI
46
VDDA
45
GNDA
44
PD#
43
VDDCPU
42
CPUCLKT4
41
CPUCLKC4
40
GNDCPU
39
CPUCLKT5
38
CPUCLKC5
37
VDDCPU
36
CPUCLKT6
35
CPUCLKC6
34
GNDCPU
33
CPUCLKT7
32
CPUCLKC7
31
VDDCPU
30
MULTSEL0
29
MULTSEL1
28
GND
27
GNDI REF
26
I REF
25
VDDI REF
48-Pin SSOP and TSSOP
Functionality
SEL133/
100
FS0
FS1
Function
0
0 0 Active 100MHz
0
0 1 100MHz Test Mode
0
1 0 100MHz Test Mode
0
1 1 Tristate all outputs
1
0 0 Active 133MHz
1
0 1 133MHz Test Mode
1
1 0 Active 200MHz
1
1 1 Reserved
Analog Power Groups
VDD48, GND48 = 48MHz, PLL2
VDDA=VDD (core supply voltage 3.3V)
GNDA=Ground for core supply
Digital Power Group
VDDREF, GNDREF = REF, Xtal
Block Diagram
PLL2
X1
XTAL
X2
OSC
PLL1
Spread
Spectrum
PD#
SPREAD#
MULTSEL(1:0)
SEL100/133
FS(1:0)
Control
Logic
Config.
Reg.
CPU
DIVDER
PCI
DIVDER
48MHz
48MHz#
REF
8 ^{CPUCLKT (7:0)}
8 ^{CPUCLKC (7:0)}
PCICLK
I REF
9248-150 Rev B 06/12/01
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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