DATA SHEET
ICS840031I
Integrated
ICS840031I
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL
Circuit
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
Systems, Inc.
CLOCK GENERATOR
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
HiPerClockS™
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
•
-40°C to 85°C ambient operating temperature
ICS
F
REQUENCY
T
ABLE
Inputs
Crystal Frequency (MHz)
24.576
Output Frequency
(MHz)
98.304
B
LOCK
D
IAGRAM
PLL_SEL
(Pullup)
P
IN
A
SSIGNMENT
0
V
DD
XTAL_OUT
XTAL_IN
V
DDA
1
2
3
4
8
7
6
5
V
DDO
Q0
GND
PLL_SEL
XTAL_IN
Q0
OSC
XTAL_OUT
Phase
Detector
VCO
589.824MHz w/
24.576MHz Ref.
÷6
1
ICS840031I
8-Lead SOIC
3.90mm x 4.90mm x 1.37mm package body
M Package
Top View
M = ÷24
(fixed)
840031AMI
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 24, 2005
IDT™ / ICS™
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL CLOCK
1
GENERATOR
1
ICS840031I
ICS840031I
Circuit
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
Integrated
ICS840031I
Systems, Inc.
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
TSD
LVCMOS/LVTTL C
LOCK
G
ENERATOR
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2,
3
4
5
6
7
8
Name
V
DD
XTAL_OUT,
XTAL_IN
V
DDA
PLL_SEL
GND
Q0
V
DDO
Power
Input
Power
Input
Power
Output
Power
Pullup
Type
Description
Core supply pin.
Cr ystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
Analog supply pin.
PLL select pin. LVCMOS/LVTTL interface levels.
Power supply ground.
Single-ended clock output. LVCMOS/LVTTL interface levels.
Output supply pin.
NOTE:
Pullup
refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
C
PD
R
PULLUP
R
OUT
Parameter
Input Capacitance
Power Dissipation Capacitance
Input Pullup Resistor
Output Impedance
V
DD
= V
DDA
= 3.465V, V
DDO
= 1.89V
Test Conditions
Minimum
Typical
4
18
51
10
Maximum
Units
pF
pF
kΩ
Ω
840031AMI
www.icst.com/products/hiperclocks.html
2
REV. A FEBRUARY 24, 2005
IDT™ / ICS™
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
2
ICS840031I
ICS840031I
Circuit
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
Integrated
ICS840031I
Systems, Inc.
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
TSD
LVCMOS/LVTTL C
LOCK
G
ENERATOR
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
DD
Inputs, V
I
Outputs, V
O
Package Thermal Impedance,
θ
JA
Storage Temperature, T
STG
4.6V
-0.5V to V
DD
+ 0.5 V
-0.5V to V
DDO
+ 0.5V
112.7°C/W (0 lfpm)
-65°C to 150°C
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
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V±5%, V
DDO
= 1.8V±5%, T
A
= -40°C
TO
85°C
Symbol
V
DD
V
DDA
V
DDO
I
DD
I
DDA
I
DDO
Parameter
Core Supply Voltage
Analog Supply Voltage
Output Supply Voltage
Power Supply Current
Analog Supply Current
Output Supply Current
Test Conditions
Minimum
3.135
3.135
1.71
Typical
3.3
3.3
1.8
Maximum
3.465
3.465
1.89
55
12
5
Units
V
V
V
mA
mA
mA
T
ABLE
3B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V±5%, V
DDO
= 1.8V±5%, T
A
= -40°C
TO
85°C
Symbol
V
IH
V
IL
I
IH
I
IL
V
OH
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
PLL_SEL
PLL_SEL
V
DD
= V
IN
= 3.465V
V
DD
= 3.465V, V
IN
= 0V
-150
1.5
0.4
Test Conditions
Minimum
2
-0.3
Typical
Maximum
V
DD
+ 0.3
0. 8
5
Units
V
V
µA
µA
V
V
Output High Voltage; NOTE 1
V
OL
Output Low Voltage; NOTE 1
NOTE 1: Outputs terminated with 50
Ω
to V
DD
/2. See Parameter Measurement Information Section,
"3.3V/1.8V Output Load Test Circuit".
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
F_SEL = 1
20.417
Test Conditions
Minimum
Typical
Fundamental
24.576
26.667
50
7
MHz
Ω
pF
Maximum
Units
T
ABLE
5. AC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V±5%, V
DDO
= 1.8V±5%, T
A
= -40°C
TO
85°C
Symbol
f
OUT
Parameter
Output Frequency
RMS Phase Jitter (Random);
NOTE 1
Output Rise/Fall Time
Test Conditions
fOUT = 98.304MHz,
(12KHz to 20MHz)
20% to 80%
Minimum
81.67
Typical
98.304
0.75
0.2
46
1
54
Maximum
106.67
Units
MHz
ps
ns
%
t
jit(Ø)
t
R
/ t
F
odc
Output Duty Cycle
NOTE 1: Please refer to the Phase Noise Plot.
840031AMI
www.icst.com/products/hiperclocks.html
3
REV. A FEBRUARY 24, 2005
IDT™ / ICS™
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
3
ICS840031I
ICS840031I
Circuit
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
Integrated
ICS840031I
Systems, Inc.
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
TSD
LVCMOS/LVTTL C
LOCK
G
ENERATOR
T
YPICAL
P
HASE
N
OISE AT
98.304MH
Z
-10
-20
-30
-40
-50
➤
Filter
98.304MHz
RMS Phase Jitter (Random)
12KHz to 20MHz = 0.75ps (typical)
0
N
OISE
P
OWER
dBc
Hz
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
10
100
1k
10k
100k
1M
10M
100M
Raw Phase Noise Data
➤
➤
Phase Noise Result by adding
a Filter to raw data
O
FFSET
F
REQUENCY
(H
Z
)
www.icst.com/products/hiperclocks.html
4
840031AMI
REV. A FEBRUARY 24, 2005
IDT™ / ICS™
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
4
ICS840031I
ICS840031I
Circuit
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
Integrated
ICS840031I
Systems, Inc.
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
TSD
LVCMOS/LVTTL C
LOCK
G
ENERATOR
P
ARAMETER
M
EASUREMENT
I
NFORMATION
2.4±0.9V
0.9V±5%
Phase Noise Plot
Noise Power
V
DD
,
V
DDA
SCOPE
V
DDO
GND
Qx
Phase Noise Mask
LVCMOS
f
1
Offset Frequency
f
2
-0.9V±5%
RMS Jitter = Area Under the Masked Phase Noise Plot
3.3V/1.8V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
RMS P
HASE
J
ITTER
V
DD
80%
20%
t
R
80%
20%
t
F
Q0
Pulse Width
t
2
PERIOD
Clock
Outputs
odc =
t
PW
t
PERIOD
O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
O
UTPUT
R
ISE
/F
ALL
T
IME
840031AMI
www.icst.com/products/hiperclocks.html
5
REV. A FEBRUARY 24, 2005
IDT™ / ICS™
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
5
ICS840031I
嵌入式系统
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