CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER
ICS843S1333
General Description
The ICS843S1333 is a high frequency clock
generator and is a member of the HiPerClockS™
HiPerClockS™
family of High Performance Clock Solutions from
IDT. The ICS843S1333 uses an external 20MHz
crystal to synthesize 1333.33MHz. The
ICS843S1333 has excellent cycle-to-cycle and RMS period jitter
performance.
Features
•
•
•
•
•
•
•
•
One differential LVPECL output
Crystal oscillator interface designed for 18pF, 20MHz parallel
resonant crystal
Cycle-to-Cycle Jitter: 25ps (maximum)
Period Jitter, RMS: 2ps (maximum)
Output Duty Cycle: 48 – 52%
Full 3.3V supply mode
0°C to 70°C ambient operating temperature
Available in lead-free (RoHS 6) packages
ICS
The ICS843S1333 operates at 3.3V operating supply and is
available in a fully RoHS compliant 8-lead TSSOP package.
Table 1. Frequency Table
Crystal Frequency (MHz)
20
Multiplier Value
66.67
Output Frequency (MHz)
1333.33
Block Diagram
OE
Pullup
20MHz
Pin Assignment
D
Q
V
CCA
XTAL_IN
OSC
PLL Multiplier
(x66.67)
CLK
Q
nQ
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q
nQ
OE
XTAL_OUT
ICS843S1333
8 Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
IDT™ / ICS™
3.3V LVPECL CLOCK SYNTHESIZER
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ICS843S1333
CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER
Table 2. Pin Descriptions
Number
1
2
3,
4
5
6, 7
8
Name
V
CCA
V
EE
XTAL_OUT
XTAL_IN
OE
nQ, Q
V
CC
Power
Power
Input
Type
Description
Analog supply pin.
Negative supply pin.
Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
Synchronous output enable. When logic HIGH, the outputs are enabled and
active. When logic LOW, Q output is forced LOW and nQ output is forced
HIGH. LVCMOS/LVTTL interface levels.
Differential output pair. LVPECL interface levels.
Core supply pin.
Input
Output
Power
Pullup
NOTE:
Pullup
refers to internal input resistors. See Table 2,
Pin Characteristics,
for typical values.
Table 3. Pin Characteristics
Symbol
C
IN
R
PULLUP
Parameter
Input Capacitance
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
k
Ω
IDT™ / ICS™
3.3V LVPECL CLOCK SYNTHESIZER
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CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER
Absolute Maximum Ratings
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 beyond
those listed in the
DC Characteristics or AC Characteristics
is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect product reliability.
Item
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuos Current
Surge Current
Package Thermal Impedance,
θ
JA
Storage Temperature, T
STG
Rating
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
115.2°C/W (0 mps)
-65°C to 150°C
DC Electrical Characteristics
Table 4A. Power Supply DC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
=
0°C to 70°C
Symbol
V
CC
V
CCA
I
EE
I
CCA
Parameter
Core Supply Voltage
Analog Supply Voltage
Power Supply Current
Analog Supply Current
Test Conditions
Minimum
3.135
V
CC
– 0.20
Typical
3.3
3.3
Maximum
3.465
V
CC
55
20
Units
V
V
mA
mA
Table 4C. LVCMOS/LVTTL DC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
=
0°C to 70°C
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
V
CC
= V
IN
= 3.465V
V
CC
= 3.465V, V
IN
= 0V
-150
Test Conditions
Minimum
2
-0.3
Typical
Maximum
V
CC
+ 0.3
0.8
10
Units
V
V
µA
µA
Table 4C. LVPECL DC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
=
0°C to 70°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
– 1.3
V
CC
– 2.0
0.6
Typical
Maximum
V
CC
– 0.8
V
CC
– 1.6
1.0
Units
V
V
V
NOTE 1: Outputs termination with 50Ω to V
CC
– 2V.
IDT™ / ICS™
3.3V LVPECL CLOCK SYNTHESIZER
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CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER
Table 5. Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Test Conditions
Minimum
Typical
Fundamental
20
50
7
MHz
Maximum
Units
Ω
pF
AC Electrical Characteristics
Table 6. AC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
=
0°C to 70°C
Parameter Symbol
f
OUT
tjit(cc)
tjit(per)
t
R
/ t
F
odc
Output Frequency
Cycle-to-Cycle Jitter; NOTE 1
Period Jitter, RMS; NOTE 1
Output Rise/Fall Time
Output Duty Cycle
20% to 80%
100
48
Test Conditions
Minimum
Typical
1333.33
25
2
200
52
Maximum
Units
MHz
ps
ps
ps
%
NOTE 1: This parameter is defined in accordance with JEDEC Standard 65.
IDT™ / ICS™
3.3V LVPECL CLOCK SYNTHESIZER
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CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER
Parameter Measurement Information
2V
nQ
V
CC
V
CCA
Qx
SCOPE
Q
tcycle
n
➤
LVPECL
nQx
V
EE
tjit(cc)
=
|
tcycle
n –
tcycle
n+1
|
1000 Cycles
-1.3V±0.165V
3.3V LVPECL Output Load AC Test Circuit
Cycle-to-Cycle Jitter
V
OH
V
REF
V
OL
nQ
80%
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%
Q
t
R
Histogram
Reference Point
(Trigger Edge)
Mean Period
(First edge after trigger)
Period Jitter
Output Rise/Fall Time
nQ
Q
t
PW
t
PERIOD
odc =
t
PW
t
PERIOD
x 100%
Output Duty Cycle/Pulse Width/Period
IDT™ / ICS™
3.3V LVPECL CLOCK SYNTHESIZER
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ICS843S1333CG REV. A AUGUST 287, 2008
➤
➤
tcycle
n+1
➤
80%
V
SW I N G
20%
t
F
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