PRELIMINARY
FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL
CLOCK MULTIPLIER
ICS843081I-33
General Description
The ICS843081I-33 is an Ethernet Clock Multiplier
and a member of the HiPerClocks
TM
family of high
HiPerClockS™
performance devices from IDT. The ICS843081I-33
accepts a crystal reference of 20MHz. The
ICS843081I-33 has excellent 1ps or lower phase
jitter performance, over the 12kHz - 20MHz integration range. The
ICS843081I-33 is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
Features
•
•
•
•
•
•
•
•
One differential 3.3V LVPECL output
One crystal oscillator interface: 20MHz
Output frequency: 500MHz
VCO: 500MHz
RMS phase jitter at 500MHz using a 20MHz crystal,
(12kHz – 20MHz): 0.72ps (typical)
Full 3.3V output supply mode
-40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
ICS
Table 1. Frequency Table
Input
Crystal Frequency (MHz)
20
M/N Multiplier
25
Output Frequency (MHz)
500
Block Diagram
OE
Pullup
Pin Assignment
V
CCA
XTAL_OUT
XTAL_IN
V
EE
Q
1
2
3
4
8
7
6
5
V
CC
Q
Q
OE
20MHz
XTAL_IN
Phase
Detector
XTAL_OUT
VCO
500MHz
nQ
ICS843081I-33
8 Lead TSSOP
4.40mm x 3.0mm x 0.925
package body
G Package
Top View
M = ÷25 (fixed)
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 LVPECL CLOCK MULTIPLIER
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ICS843081AGI-33 REV. A JANUARY 8, 2008
ICS843081I-33
FEMTOCLOCK™CRYSTAL-TO-3.3V LVPECL CLOCK MULTIPLIER
PRELIMINARY
Table 1. Pin Descriptions
Number
1
2,
3
4
5
6, 7
8
Name
V
CCA
XTAL_OUT
XTAL_IN
V
EE
OE
nQ, Q
V
CC
Power
Input
Power
Input
Output
Power
Pullup
Type
Description
Analog supply pin.
Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
Negative supply pin.
Output enable pin. When HIGH, Q/Q outputs are enabled. When LOW, forces
Q/nQ in high-impedance state. LVCMOS/LVTTL interface levels.
Differential output pair. LVPECL interface levels.
Core supply pin.
NOTE:
Pullup
refers to internal input resistors. See Table 2,
Pin Characteristics,
for typical values.
Table 2. 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 MULTIPLIER
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ICS843081AGI-33 REV. A JANUARY 8, 2008
ICS843081I-33
FEMTOCLOCK™CRYSTAL-TO-3.3V LVPECL CLOCK MULTIPLIER
PRELIMINARY
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
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%, 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
80
Maximum
3.465
V
CC
mA
mA
Units
V
Table 3B. LVCMOS/LVTTL DC Characteristics,
V
CC
= 3.3V ± 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
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
5
Units
V
V
µA
µA
Table 3C. LVPECL DC Characteristics,
V
CC
= 3.3V ± 5%, 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.
IDT™ / ICS™
3.3V LVPECL CLOCK MULTIPLIER
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ICS843081AGI-33 REV. A JANUARY 8, 2008
ICS843081I-33
FEMTOCLOCK™CRYSTAL-TO-3.3V LVPECL CLOCK MULTIPLIER
PRELIMINARY
Table 4. Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Drive Level
Test Conditions
Minimum
Typical
Fundamental
20
50
7
1
MHz
Maximum
Units
Ω
pF
mW
AC Electrical Characteristics
Table 5. AC Characteristics,
V
CC
= 3.3V ± 5%, T
A
= -40°C to 85°
Parameter Symbol
f
OUT
tjit(Ø)
t
R
/ t
F
odc
Output Frequency
RMS Phase Jitter, Random;
NOTE 1
Output Rise/Fall Time
Output Duty Cycle
500MHz,
Integration Range: 12kHz – 20MHz
20% to 80%
0.72
400
50
Test Conditions
Minimum
Typical Maximum
500
Units
MHz
ps
ps
%
NOTE 1: Refer to the Phase Noise Plot.
IDT™ / ICS™
3.3V LVPECL CLOCK MULTIPLIER
4
ICS843081AGI-33 REV. A JANUARY 8, 2008
ICS843081I-33
FEMTOCLOCK™CRYSTAL-TO-3.3V LVPECL CLOCK MULTIPLIER
PRELIMINARY
Typical Phase Noise at 500MHz
➝
Ethernet Filter
500MHz
RMS Phase Jitter (Random)
12kHz to 20MHz = 0.72ps (typical)
dBc
Hz
➝
Noise Power
Raw Phase Noise Data
IDT™ / ICS™
3.3V LVPECL CLOCK MULTIPLIER
➝
Phase Noise Result by adding
an Ethernet filter to raw data
Offset Frequency (Hz)
5
ICS843081AGI-33 REV. A JANUARY 8, 2008
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