FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL
75MHZ FREQUENCY SYNTHESIZER W/SSC
ICS843301I-108
G
ENERAL
D
ESCRIPTION
The ICS843301I-108 is a 75MHz Frequency
Generator and a member of the HiPerClocks
TM
family
HiPerClockS™
of high perfor mance devices from IDT. The
ICS843301I-108 uses a 20MHz crystal to synthesize
a 75MHz output. The device supports 0.5% down-
spread spread spectrum clocking. The ICS843301I-108 has
excellent <1ps phase jitter performance, over an integration
range of
900kHz - 7.5MHz.
The device is packaged in a small
8-pin TSSOP, making it ideal for use in systems with limited
board space.
F
EATURES
•
One differential 3.3V or 2.5V LVPECL output
•
Crystal oscillator interface designed for 20MHz,
18pF parallel resonant crystal
•
Output frequency: 75MHz
•
Supports SSC, 0.5% downspread
•
RMS phase jitter @ 75MHz, using a 20MHz crystal
(900kHz - 7.5MHz): 0.71ps (typical)
•
Full 3.3V or 2.5V operating supply
•
-40°C to 85°C ambient operating temperature
•
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
IC
S
SSC F
UNCTION
T
ABLE
Input
SSC
0 (default)
1
Mode
SSC Off
0.5% Downspread
B
LOCK
D
IAGRAM
20MHz
XTAL_IN
P
IN
A
SSIGNMENT
PLL
Phase
Detector
VCO
600MHz
OSC
XTAL_OUT
N Div
÷8
Q
nQ
V
CCA
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q
nQ
SSC
SSC
Pulldown
M Div
÷30
ICS843301I-108
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
1
ICS843301BGI-108 REV. A JULY 25, 2008
ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2
3, 4
5
6, 7
8
Name
V
CCA
V
EE
XTAL_OUT,
XTAL_IN
SSC
nQ, Q
V
CC
Power
Power
Input
Input
Output
Power
Type
Description
Analog supply pin.
Negative supply pin.
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
Pulldown SSC control pin. LVCMOS/LVTTL interface levels.
Differential clock outputs. LVPECL interface levels.
Core and output supply pin.
NOTE:
Pulldown
refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
PULLDOWN
Parameter
Input Pin Capacitance
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
2
ICS843301BGI-108 REV. A JULY 25, 2008
ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
Storage Temperature, T
STG
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
-65°C to 150°C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause per manent damage to the
device. These ratings are stress specifications only. Functional op-
eration of product at these conditions or any conditions beyond
those listed in the
DC Characteristics
or
AC Characteristics
is not
implied. Exposure to absolute maximum rating conditions for ex-
tended periods may affect product reliability.
Package Thermal Impedance,
θ
JA
112.4°C/W (0 mps)
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
V
CC
V
CCA
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
3.135
V
CC
– 0.12
Typical
3. 3
3. 3
Maximum
3.465
V
CC
12
77
Units
V
V
mA
mA
T
ABLE
3B. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= 2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
V
CC
V
CCA
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
2.375
V
CC
– 0.11
Typical
2.5
2.5
Maximum
2.625
V
CC
11
72
Units
V
V
mA
mA
T
ABLE
3C. LVCMOS / LVTTL DC C
HARACTERISTICS
,
V
CC
= 3.3V±5%
OR
2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Test Conditions
V
CC
= 3.3V
V
CC
= 2.5V
V
CC
= 3.3V
V
CC
= 2.5V
V
CC
= V
IN
= 3.465V or 2.625V
V
CC
= 3.465V or 2.625V, V
IN
= 0V
-5
Minimum
2
1.7
-0.3
-0.3
Typical
Maximum
V
CC
+ 0.3
V
CC
+ 0.3
0.8
0.7
150
Units
V
V
V
V
µA
µA
T
ABLE
3D. LVPECL DC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
V
OH
V
OL
V
SWING
Parameter
Output High Voltage; NOTE 1
Output Low Voltage; NOTE 1
Peak-to-Peak Output Voltage Swing
Test Conditions
Minimum
V
CC
- 1.4
V
CC
- 2.0
0.6
Typical
Maximum
V
CC
- 0.9
V
CC
- 1.7
1.0
Units
V
V
V
NOTE 1: Outputs terminated with 50
Ω
to V
CC
- 2V.
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
3
ICS843301BGI-108 REV. A JULY 25, 2008
ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
T
ABLE
3E. LVPECL DC C
HARACTERISTICS
,
V
CC
= 2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
V
OH
V
OL
V
SWING
Parameter
Output High Voltage; NOTE 1
Output Low Voltage; NOTE 1
Peak-to-Peak Output Voltage Swing
Test Conditions
Minimum
V
CC
- 1.4
V
CC
- 2.0
0.4
Typical
Maximum
V
CC
- 0.9
V
CC
- 1.5
1.0
Units
V
V
V
NOTE 1: Outputs terminated with 50
Ω
to V
CC
- 2V.
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Test Conditions
Minimum
Typical
Fundamental
20
40
7
MHz
Ω
pF
Maximum
Units
T
ABLE
5A. AC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol Parameter
f
OUT
Output Frequency
RMS Phase Jitter,
(Random); NOTE 1, 2
SSC Modulation Frequency; NOTE 3
SSC Modulation Factor ; NOTE 3
Spectral Reduction; NOTE 3
Output Rise/Fall Time; NOTE 1
75MHz
(Integration Range:
900kHz - 7.5MHz)
F
OUT
= 75MHz
F
OUT
= 75MHz
F
OUT
= 75MHz
20% to 80%
7
200
48
Test Conditions
Minimum
Typical
75
0.71
29
0.4
10
700
52
33.33
0.5
Maximum
Units
MHz
ps
kHz
%
dB
ps
%
t
jit(Ø)
F
M
F
MF
SSC
red
t
R
/ t
F
o dc
Output Duty Cycle; NOTE 2
NOTE 1: Please refer to the Phase Noise Plot.
NOTE 2: Spread Spectrum clocking disabled.
NOTE 3: Spread Spectrum clocking enabled.
T
ABLE
5B. AC C
HARACTERISTICS
,
V
CC
= 2.5V±5%, T
A
= -40°C
TO
85°C
Symbol Parameter
f
OUT
Output Frequency
RMS Phase Jitter,
(Random); NOTE 1, 2
SSC Modulation Frequency; NOTE 3
SSC Modulation Factor ; NOTE 3
Spectral Reduction; NOTE 3
Output Rise/Fall Time; NOTE 1
75MHz
(Integration Range:
900kHz - 7.5MHz)
F
OUT
= 75MHz
F
OUT
= 75MHz
F
OUT
= 75MHz
20% to 80%
7
200
48
Test Conditions
Minimum
Typical
75
0.66
29
0.4
10
700
52
33.33
0.6
Maximum
Units
MHz
ps
kHz
%
dB
ps
%
t
jit(Ø)
F
M
F
MF
SSC
red
t
R
/ t
F
o dc
Output Duty Cycle; NOTE 2
NOTE 1: Please refer to the Phase Noise Plot.
NOTE 2: Spread Spectrum clocking disabled.
NOTE 3: Spread Spectrum clocking enabled.
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
4
ICS843301BGI-108 REV. A JULY 25, 2008
ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
T
YPICAL
P
HASE
N
OISE AT
75MH
Z
@ 3.3V
75MHz
RMS Phase Jitter (Random)
900kHz to 7.5MHz = 0.71ps (typical)
➤
Filter
Raw Phase Noise Data
N
OISE
P
OWER
dBc
Hz
➤
Phase Noise Result by
adding a Filter to raw data
O
FFSET
F
REQUENCY
(H
Z
)
T
YPICAL
P
HASE
N
OISE AT
75MH
Z
@ 2.5V
75MHz
RMS Phase Jitter (Random)
900kHz to 7.5MHz = 0.66ps (typical)
➤
Filter
O
FFSET
F
REQUENCY
(H
Z
)
5
N
OISE
P
OWER
dBc
Hz
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
➤
➤
Raw Phase Noise Data
➤
Phase Noise Result by
adding a Filter to raw data
ICS843301BGI-108 REV. A JULY 25, 2008
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