PRELIMINARY
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
HiPerClockS™
family of high perfor mance devices from IDT.
The ICS843301I-108 uses a 20MHz crystal to
synthesize 75MHz output. The device supports
0.5% downspread 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): 0.73ps (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
V
CCA
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q
nQ
SSC
PLL
Phase
Detector
VCO
600MHz
OSC
XTAL_OUT
N Div
÷8
Q
nQ
ICS843301I-108
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
SSC
Pulldown
M Div
÷30
The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization
and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
1
ICS843301BGI-108 REV. A OCTOBER 9, 2007
ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
PRELIMINARY
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 OCTOBER 9, 2007
ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
PRELIMINARY
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
101.7°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
– 0.10
Typical
3.3
3. 3
10
106
Maximum
3.465
V
CC
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
– 0.09
Typical
2.5
2.5
9
100
Maximum
2.625
V
CC
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%
OR
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
0.6
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 OCTOBER 9, 2007
ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
PRELIMINARY
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Drive Level
Test Conditions
Minimum
Typical
Fundamental
20
90
7
300
MHz
Ω
pF
µW
Maximum
Units
T
ABLE
5A. AC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol Parameter
f
OUT
t
jit(Ø)
F
M
F
MF
SSC
red
t
R
/ t
F
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
Test Conditions
75MHz
(Integration Range: 900kHz - 7.5MHz)
F
OUT
= 75MHz
F
OUT
= 75MHz
F
OUT
= 75MHz
20% to 80%
29
0.5
8
475
50
Minimum
Typical
75
0.73
33.33
Maximum
Units
MHz
ps
kHz
%
dB
ps
%
odc
Output Duty Cycle
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
t
jit(Ø)
F
M
F
MF
SSC
red
t
R
/ t
F
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
Test Conditions
75MHz
(Integration Range: 900kHz - 7.5MHz)
F
OUT
= 75MHz
F
OUT
= 75MHz
F
OUT
= 75MHz
20% to 80%
29
0.4
7.5
450
50
Minimum
Typical
75
0.72
33.33
Maximum
Units
MHz
ps
kHz
%
dB
ps
%
odc
Output Duty Cycle
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 OCTOBER 9, 2007
ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
PRELIMINARY
P
ARAMETER
M
EASUREMENT
I
NFORMATION
2V
2V
2V
2V
V
CC
V
CCA
Qx
SCOPE
V
CC
V
CCA
Qx
SCOPE
LVPECL
nQx
V
EE
LVPECL
nQx
V
EE
-1.3V ± 0.165V
-0.5V ± 0.125V
3.3V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
2.5V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
V
OH
V
REF
V
OL
80%
Clock
Outputs
80%
V
SW I N G
1σ contains 68.26% of all measurements
2σ contains 95.4% of all measurements
3σ contains 99.73% of all measurements
4σ contains 99.99366% of all measurements
6σ contains (100-1.973x10
-7
)% of all measurements
20%
t
R
t
F
20%
Reference Point
(Trigger Edge)
Histogram
Mean Period
(First edge after trigger)
P
ERIOD
J
ITTER
O
UTPUT
R
ISE
/F
ALL
T
IME
nQ
Q
t
PW
t
PERIOD
odc =
t
PW
t
PERIOD
x 100%
O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
5
ICS843301BGI-108 REV. A OCTOBER 9, 2007
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