Integrated
Circuit
Systems, Inc.
ICS9248-150
FrequencyGeneratorforMulti-ProcessorServers
Recommended Application:
ServerWorks Grand Champion Systems.
Pin Configuration
Output Features:
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
PCICLK
VDD48
FS0/48MHz
FS1/48MHz#
GND48
SEL100/133
GNDPCI
VDDA
GNDA
PD#
•
•
•
8 - Differential CPU Clock Pairs @ 3.3V
1 - 3V 33MHz PCI clocks
1 - 48MHz clock
VDDCPU
CPUCLKT0
CPUCLKC0
GNDCPU
CPUCLKT1
CPUCLKC1
VDDCPU
CPUCLKT2
CPUCLKC2
GNDCPU
CPUCLKT3
CPUCLKC3
VDDCPU
REF
VDDCPU
CPUCLKT4
CPUCLKC4
GNDCPU
CPUCLKT5
CPUCLKC5
VDDCPU
CPUCLKT6
CPUCLKC6
GNDCPU
CPUCLKT7
CPUCLKC7
VDDCPU
MULTSEL0
MULTSEL1
GND
•
•
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.
SPREAD#
GNDREF
X1
X2
VDDREF
•
•
External resistor for current reference
FS pins for frequency select
GNDI REF
I REF
VDDI REF
Key Specifications:
•
•
•
•
PCI Output jitter <500ps
CPU Output jitter <200ps
48MHz Output jitter <350ps
REF Output jitter < 1000ps
48-Pin SSOP and TSSOP
Functionality
Block Diagram
SEL133/
100
FS0 FS1
Function
PLL2
48MHz
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Active 100MHz
100MHz Test Mode
100MHz Test Mode
Tristate all outputs
Active 133MHz
133MHz Test Mode
Active 200MHz
Reserved
48MHz#
0
X1
X2
XTAL
OSC
0
REF
0
1
PLL1
Spread
Spectrum
CPUCLKT (7:0)
CPUCLKC (7:0)
CPU
DIVDER
8
1
8
1
PCI
DIVDER
PCICLK
1
PD#
SPREAD#
Control
Logic
MULTSEL(1:0)
SEL100/133
FS(1:0)
Analog Power Groups
VDD48, GND48=48MHz, PLL2
VDDA=VDD (core supply voltage 3.3V)
GNDA=Ground for core supply
Config.
Reg.
I REF
Digital Power Group
VDDREF, GNDREF=REF, Xtal
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
9248-150 Rev B 06/12/01
Third party brands and names are the property of their respective owners.