FEMTOCLOCK™ CRYSTAL-TO-
3.3V, 2.5V LVPECL CLOCK GENERATOR
ICS843321I-12
Features
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One differential 3.3V LVPECL output pair
Crystal oscillator interface designed for 18pF parallel resonant
crystals
Output frequencies: 311.04MHz or 622.08MHz
VCO range: 580MHz – 750MHz
RMS phase jitter @ 622.08MHz, using a 19.44MHz crystal
(12kHz – 20MHz): 0.96ps (typical), 3.3V
Full 3.3V or 2.5V supply modes
-40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
General Description
The ICS843321I-12 is a SONET Clock Generator
and a member of the HiPerClocks
TM
family of high
HiPerClockS™
performance devices from IDT. The ICS843321I-12
can synthesize SONET reference clock frequencies
with the appropriate choice of crystal and output
divider. The ICS843321I-12 uses IDT’s 3
rd
generation low phase
noise VCO technology, and can achieve <1ps rms phase jitter
performance over the 12kHz – 20MHz integration range. The
ICS843321I-12 is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
ICS
Frequency Table
Inputs
Crystal Frequency (MHz)
19.44
19.44
FREQ_SEL
1
0
Output Frequency (MHz)
622.08
311.04
Block Diagram
FREQ_SEL
Pulldown
Pin Assignment
V
CCA
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q
nQ
FREQ_SEL
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
580MHz - 750MHz
FREQ_SEL N
1
÷1
0
(default)
÷2
Q
nQ
÷32
(fixed)
ICS843321I-12
8 Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
IDT™ / ICS™
3.3V, 2.5V LVPECL CLOCK GENERATOR
1
ICS843321AGI-12 REV. A FEBRUARY 27, 2009
ICS843321I-12
FEMTOCLOCK™CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Table 1. Pin Descriptions
Number
1
2
3, 4
5
6, 7
8
Name
V
CCA
V
EE
XTAL_OUT
XTAL_IN
FREQ_SEL
nQ, Q
V
CC
Power
Power
Input
Input
Output
Power
Pulldown
Type
Description
Analog supply pin.
Negative supply pin.
Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
Frequency select pin. LVCMOS/LVTTL interface levels.
Differential output pair. LVPECL interface levels.
Core supply pin.
NOTE: Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Symbol
C
IN
R
PULLDOWN
Parameter
Input Capacitance
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
k
Ω
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
Item
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuos Current
Surge Current
Package Thermal Impedance,
θ
JA
Storage Temperature, T
STG
in the
DC Characteristics or AC Characteristics
is not implied.
Exposure to absolute maximum rating conditions for extended
periods may affect product reliability.
Rating
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
129.5°C/W (0 mps)
-65°C to 150°C
DC Electrical Characteristics
Table 3A. Power Supply DC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°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
– 0.10
Typical
3.3
3.3
Maximum
3.465
V
CC
83
10
Units
V
V
mA
mA
IDT™ / ICS™
3.3V, 2.5V LVPECL CLOCK GENERATOR
2
ICS843321AGI-12 REV. A FEBRUARY 27, 2009
ICS843321I-12
FEMTOCLOCK™CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Table 3B. Power Supply DC Characteristics,
V
CC
= 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°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
2.375
V
CC
– 0.08
Typical
2.5
2.5
Maximum
2.625
V
CC
78
8
Units
V
V
mA
mA
Table 3C. LVCMOS/LVTTL DC Characteristics,
V
CC
= 3.3V ± 5% or 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
IH
Parameter
Input High Voltage
Test Conditions
V
CC
= 3.3V
V
CC
= 2.5V
Input Low Voltage
Input High Current
Input Low Current
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
V
IL
I
IH
I
IL
Table 3D. LVPECL DC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
OH
V
OL
V
SWING
Parameter
Output High Current; NOTE 1
Output Low Current; 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
µA
µA
V
NOTE 1: Outputs termination with 50Ω to V
CC
– 2V.
Table 3E. LVPECL DC Characteristics,
V
CC
= 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
OH
V
OL
V
SWING
Parameter
Output High Current; NOTE 1
Output Low Current; 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
µA
µA
V
NOTE 1: Outputs termination with 50Ω to V
CC
– 2V.
Table 4. Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
18.125
Test Conditions
Minimum
Typical
Fundamental
23.4375
40
7
MHz
Maximum
Units
Ω
pF
IDT™ / ICS™
3.3V, 2.5V LVPECL CLOCK GENERATOR
3
ICS843321AGI-12 REV. A FEBRUARY 27, 2009
ICS843321I-12
FEMTOCLOCK™CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
AC Electrical Characteristics
Table 5A. AC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
f
OUT
tjit(Ø)
t
R
/ t
F
odc
Parameter
Output Frequency
RMS Phase Jitter, Random;
NOTE 1
Output Rise/Fall Time
Output Duty Cycle
Test Conditions
FREQ_SEL = 0
FREQ_SEL = 1
622.08MHz,
(Integration Range: 12kHz – 20MHz)
20% to 80%
100
47
Minimum
Typical
311.04
622.08
0.96
600
53
Maximum
Units
MHz
MHz
ps
ps
%
NOTE 1: Refer to Phase Noise Plot.
Table 5B. AC Characteristics,
V
CC
= 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
f
OUT
tjit(Ø)
t
R
/ t
F
odc
Parameter
Output Frequency
RMS Phase Jitter, Random;
NOTE 1
Output Rise/Fall Time
Output Duty Cycle
Test Conditions
FREQ_SEL = 0
FREQ_SEL = 1
622.08MHz,
(Integration Range: 12kHz – 20MHz)
20% to 80%
100
45
Minimum
Typical
311.04
622.08
0.86
600
55
Maximum
Units
MHz
MHz
ps
ps
%
NOTE 1: Refer to Phase Noise Plot.
IDT™ / ICS™
3.3V, 2.5V LVPECL CLOCK GENERATOR
4
ICS843321AGI-12 REV. A FEBRUARY 27, 2009
ICS843321I-12
FEMTOCLOCK™CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Typical Phase Noise at 622.08MHz @ 3.3V
622.08MHz
RMS Phase Jitter (Random)
12kHz to 20MHz = 0.96ps (typical)
Noise Power
dBc
Hz
Offset Frequency (Hz)
IDT™ / ICS™
3.3V, 2.5V LVPECL CLOCK GENERATOR
5
ICS843321AGI-12 REV. A FEBRUARY 27, 2009
嵌入式系统
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