ics9248-150 Integrated Device Technology, ics9248-150 Datasheet

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ics9248-150

Manufacturer Part Number
ics9248-150
Description
Frequency Generator For Multi - Processor Servers
Manufacturer
Integrated Device Technology
Datasheet
Frequency Generator for Multi-Processor Servers
Recommended Application:
ServerWorks Grand Champion Systems
Output Features:
Features:
Key Specifications:
Functionality
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
0352G—08/04/06
S
E
L
8 - Differential CPU Clock Pairs @ 3.3V
1 - 3V 33MHz PCI clocks
1 - 48MHz clock
1 - Inverted 48MHz clock
1 - 14.318MHz 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 <150ps
48MHz Output jitter <350ps
REF Output jitter < 1000ps
1
3
0
0
0
0
1
1
1
1
3
1 /
0
0
F
Integrated
Circuit
Systems, Inc.
S
0
0
0
0
1
1
1
1
0
F
S
0
0
0
0
1
1
1
1
1
1
1
1
R
A
r T
A
A
0
0
3
i t c
i t c
i t c
e
s i
0
0
3
s
M
M
a t
M
e v
e v
e v
r e
e t
H
H
H
e v
F
1
1
2
z
z
z
u
l l a
0
3
0
d
e T
e T
e T
0
3
0
n
M
M
M
t c
o
t s
t s
t s
u
H
H
H
o i
p t
M
M
M
z
z
z
n
u
o
o
o
s t
d
d
d
e
e
e
Block Diagram
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
XTAL
OSC
GND48
VDD48
Spectrum
PLL2
Spread
Control
Config.
Logic
PLL1
REF
Reg.
X1
X2
48-Pin SSOP and TSSOP
Pin Configuration
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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
8
8
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
I REF
48MHz
PCICLK
48MHz#
REF
CPUCLKC (7:0)
CPUCLKT (7:0)

Related parts for ics9248-150

ics9248-150 Summary of contents

Page 1

... PD# SPREAD# MULTSEL(1:0) SEL100/133 FS(1:0) ICS9248-150 Pin Configuration 1 48 PCICLK 2 47 VDD48 GND48 6 43 VDDCPU VDDCPU 13 36 ...

Page 2

... 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. ICS9248-150 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations. ...

Page 3

... ICS9248-150 ...

Page 4

... ICS9248-150 CPUCLK Swing Select Functions ...

Page 5

... From VDD = 3. target frequency 3 From deassertion of PD target frequency 0352G—08/04/06 CONDITIONS = Inputs with no pull-up resistors = 0 V; Inputs with pull-up resistors = 0 pF; Select @ 100 MHz = 0 pF; Input address to VDD or GND = 3 ICS9248-150 +0 MIN TYP MAX 0 0.3 0.8 ...

Page 6

... ICS9248-150 Electrical Characteristics - CPU 70°C; VDD=3.3V +/-5 PARAMETER SYMBOL Current Source 1 Zo Output Impedance Voltage High VHigh Voltage Low VLow Max Voltage Vovs Min Voltage Vuds 1 Rise Time t r2B 1 Fall Time t f2B Diff. Crossover Volta Duty Cycle d t2B 1 Skew CPUT0:7 ...

Page 7

... 1 OH@MIN OH@MAX @MIN OL @MAX ICS9248-150 MIN TYP 33 2.4 = 3.135 V - 0.5 1.2 0.5 1.2 45 49.9 139.7 MIN TYP 2.4 = 3.135 V - 1.3 1 1.6 45 52.5 175 MAX UNITS MHz Ω ...

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 synchronized internal to the device prior to powering down the clock synthesizer. ...

Page 9

... Lead Free, RoHS Compliant Pattern Number ( digit number for parts with ROM code patterns) Package Type F=SSOP Revision Designator (will not correlate with datasheet revision) Device Type Prefix ICS Standard Device 9 ICS9248-150 In Millimeters In Inches COMMON DIMENSIONS MAX MIN 2.80 .095 0.40 .008 ...

Page 10

... ICS9248-150 INDEX INDEX AREA AREA aaa 6.10 mm. Body, 0.50 mm. pitch TSSOP (0.020 mil) (240 mil) Ordering Information ICS9248yG-150LN-T Example: ICS XXXX PPP 0352G—08/04/06 c SYMBOL COMMON DIMENSIONS COMMON DIMENSIONS aaa ...

Page 11

... Revision History Rev. Issue Date Description E 6/9/2005 Removed PCI Skew from Electrical Characteristics Table. F 3/29/2006 Updated Electrical Characteristics CPU Table. G 8/4/2006 Added LN to Ordering Information. 0352G—08/04/06 11 ICS9248-150 Page # 7 6 9-10 ...

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