840031AMI
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 24, 2005
1
Integrated
Circuit
Systems, Inc.
ICS840031I
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVCMOS/LVTTL C
LOCK
G
ENERATOR
G
ENERAL
D
ESCRIPTION
The ICS840031I is an IEEE 1394b Clock
Generator and a member of the HiPerClocks
TM
family of high performance devices from ICS.
The ICS840031I uses a 24.576MHz crystal to
synthesize 98.304MHz. The ICS840031I has
excellent phase jitter performance, from 12KHz 20MHz
integration range. The ICS840031I is packaged in a small
8-pin SOIC, making it ideal for use in systems with limited
board space.
F
EATURES
(1) LVCMOS/LVTTL output
Crystal oscillator interface designed for a 24.576MHz,
18pF parallel resonant crystal
Output frequency: 98.304MHz (typical)
VCO range: 490MHz to 640MHz
RMS phase jitter @ 98.304MHz, using a 24.576MHz crystal
(12KHz - 20MHz): 0.75ps (typical)
RMS phase noise at 98.304MHz (typical)
Offset
Noise Power
100Hz .............. -103.3 dBc/Hz
1KHz .............. -126.2 dBc/Hz
10KHz .............. -134.2 dBc/Hz
100KHz .............. -132.9 dBc/Hz
3.3V core/1.8V output operating supply
Lead-Free fully RoHS compliant
-40C to 85C ambient operating temperature
HiPerClockSTM
ICS
ICS840031I
8-Lead SOIC
3.90mm x 4.90mm x 1.37mm package body
M Package
Top View
V
DD
XTAL_OUT
XTAL_IN
V
DDA
1
2
3
4
V
DDO
Q0
GND
PLL_SEL
8
7
6
5
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
OSC
Phase
Detector
VCO
589.824MHz w/
24.576MHz Ref.
M = 24
(fixed)
6
0
1
XTAL_IN
XTAL_OUT
PLL_SEL
Q0
F
REQUENCY
T
ABLE
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9
(Pullup)
840031AMI
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 24, 2005
2
Integrated
Circuit
Systems, Inc.
ICS840031I
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVCMOS/LVTTL C
LOCK
G
ENERATOR
T
ABLE
2. P
IN
C
HARACTERISTICS
T
ABLE
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840031AMI
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 24, 2005
3
Integrated
Circuit
Systems, Inc.
ICS840031I
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVCMOS/LVTTL C
LOCK
G
ENERATOR
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V5%, V
DDO
= 1.8V5%, T
A
= -40C
TO
85C
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A
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T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
DD
4.6V
Inputs, V
I
-0.5V to V
DD
+ 0.5 V
Outputs, V
O
-0.5V to V
DDO
+ 0.5V
Package Thermal Impedance,
JA
112.7C/W (0 lfpm)
Storage Temperature, T
STG
-65C to 150C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Functional
operation of product at these conditions or any conditions be-
yond those listed in the
DC Characteristics or AC Character-
istics is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
T
ABLE
3B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V5%, V
DDO
= 1.8V5%, T
A
= -40C
TO
85C
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ABLE
5. AC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V5%, V
DDO
= 1.8V5%, T
A
= -40C
TO
85C
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840031AMI
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 24, 2005
4
Integrated
Circuit
Systems, Inc.
ICS840031I
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVCMOS/LVTTL C
LOCK
G
ENERATOR
T
YPICAL
P
HASE
N
OISE
AT
98.304MH
Z
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
10
100
1k
10k
100k
1M
10M
100M
98.304MHz
RMS Phase Jitter (Random)
12KHz to 20MHz = 0.75ps (typical)
O
FFSET
F
REQUENCY
(H
Z
)
N
OISE
P
O
WER
dBc
Hz
Phase Noise Result by adding
a Filter to raw data
Raw Phase Noise Data
Filter
840031AMI
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 24, 2005
5
Integrated
Circuit
Systems, Inc.
ICS840031I
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVCMOS/LVTTL C
LOCK
G
ENERATOR
P
ARAMETER
M
EASUREMENT
I
NFORMATION
O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
O
UTPUT
R
ISE
/F
ALL
T
IME
3.3V/1.8V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
SCOPE
Qx
LVCMOS
2.40.9V
-0.9V5%
Pulse Width
t
PERIOD
t
PW
t
PERIOD
odc =
V
DD
2
Q0
GND
V
DD
,
V
DDA
RMS P
HASE
J
ITTER
Phase Noise Mask
Offset Frequency
f
1
f
2
Phase Noise Plot
RMS Jitter = Area Under the Masked Phase Noise Plot
Noise P
o
w
er
Clock
Outputs
20%
80%
80%
20%
t
R
t
F
V
DDO
0.9V5%
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