ICS9248YG-150-T ICST [Integrated Circuit Systems], ICS9248YG-150-T Datasheet

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ICS9248YG-150-T

Manufacturer Part Number
ICS9248YG-150-T
Description
Frequency Generator for Multi - Processor Servers
Manufacturer
ICST [Integrated Circuit Systems]
Datasheet
1.ICS9248YG-150-T.pdf (10 pages)
Frequency Generator for Multi - Processor Servers
Third party brands and names are the property of their respective owners.
Recommended Application:
ServerWorks Grand Champion Systems.
Output Features:
•
•
•
•
•
Features:
•
•
•
•
•
•
•
Key Specifications:
•
•
•
•
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
9248-150 Rev B 06/12/01
Functionality
S
E
1
L
8 - Differential CPU Clock Pairs @ 3.3V
1 - 3V 33MHz PCI clocks
1 - 48MHz clock
1 - Inverted 48MHz clock
1 - 14.318 reference output
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
PCI Output jitter <500ps
CPU Output jitter <200ps
48MHz Output jitter <350ps
REF Output jitter < 1000ps
0 0
0
0
0
0
1
1
1
1
3 1
/ 3
F
0
0
0
0
S
1
1
1
1
0
Integrated
Circuit
Systems, Inc.
F
0
0
0
0
S
1
1
1
1
1
1
1
1
A
T
A
A
R
0 0
0 0
3 3
s i r
i t c
i t c
i t c
e
e s
M
M
M
a t
e v
e v
e v
v r
H
H
e t
H
d e
1
1
2
z
z
z
F
l l a
0 0
3 3
0 0
u
e T
e T
e T
n
M
M
M
o
t s
t s
t s
t c
t u
H
H
H
o i
M
M
M
u p
z
z
z
n
o
o
o
s t
e d
e d
e d
MULTSEL(1:0)
SEL100/133
SPREAD#
FS(1:0)
PD#
X2
X1
FS1/48MHz#
CPUCLKC0
CPUCLKC1
CPUCLKC2
CPUCLKC3
FS0/48MHz
CPUCLKT0
CPUCLKT1
CPUCLKT2
CPUCLKT3
SPREAD#
GNDCPU
GNDCPU
VDDCPU
VDDCPU
VDDCPU
GNDREF
VDDREF
PCICLK
GND48
VDD48
REF
48-Pin SSOP and TSSOP
X1
X2
XTAL
OSC
Spectrum
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
PLL2
Spread
Control
Config.
PLL1
Logic
Reg.
Pin Configuration
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Block Diagram
1
2
3
4
5
6
7
8
9
DIVDER
DIVDER
CPU
PCI
ICS9248-150
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
8
8
I REF
48MHz
PCICLK
48MHz#
REF
CPUCLKT (7:0)
CPUCLKC (7:0)

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ICS9248YG-150-T Summary of contents

Page 1

Integrated Circuit Systems, Inc. Frequency Generator for Multi - Processor Servers Recommended Application: ServerWorks Grand Champion Systems. Output Features: • Differential CPU Clock Pairs @ 3.3V • 33MHz PCI clocks • 48MHz clock ...

Page 2

ICS9248-150 General Description The ICS9248-150 is a main clock for ServerWorks Grand Champion Systems. Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9248-150 employs ...

Page 3

Truth Table ...

Page 4

ICS9248-150 CPUCLK Swing Select Functions ...

Page 5

Absolute Maximum Ratings Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Logic Inputs . . . ...

Page 6

ICS9248-150 Electrical Characteristics - CPU 70C; VDD=3.3V +/-5 ETER SYM BOL 1 Output Impedance Output Impedance Output High Voltage ...

Page 7

Electrical Characteristics - PCI 70C; VDD=3.3V +/-5 PARAMETER SYMBOL Output Frequency Output Impedance R DSP1 1 Output High Voltage Output Low Voltage Output High ...

Page 8

ICS9248-150 PD# Timing Diagram The power down selection is used to put the part into a very low power state without turning off the power to the part. PD asynchronous active low input. This signal needs to be ...

Page 9

INDEX INDEX AREA AREA 45° 45° SEATING SEATING b PLANE PLANE .10 (.004) C .10 (.004) C 300 ...

Page 10

... PLANE aaa 6.10 mm. Body, 0.50 mm. pitch TSSOP (0.020 mil) (240 mil) Ordering Information ICS9248yG-150-T Example: ICS XXXX PPP - T Designation for tape and reel packaging Pattern Number ( digit number for parts with ROM code patterns) Package Type Revision Designator (will not correlate with datasheet revision) ...

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