FemtoClock® Crystal/LVCMOS-to3.3V LVPECL Frequency Synthesizer
843004I-04
DATASHEET
GENERAL DESCRIPTION
FEATURES
The 843004I-04 is a 4 output LVPECL Synthesizer optimized
to generate clock frequencies for a variety of high performance
applications. This device can select its input reference clock
from either a crystal input or a single-ended clock signal. It can
be configured to generate 4 outputs with individually selectable
divide-by-one or divide-by-four function via the 4 frequency
select pins (F_SEL[3:0]). The 843004I-04 uses IDT’s 3 rd
generation low phase noise VCO technology and can achieve
1ps or lower typical rms phase jitter. This ensures that it will
easily meet clocking requirements for SDH (STM-1/STM-4/STM16) and SONET (OC-3/OC12/OC-48). This device is suitable for
multi-rate and multiple port line card applications. The 843004I04 is conveniently packaged in a small 24-pin TSSOP package.
• Four LVPECL outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following applications: SONET/SDH, SATA,
or 10Gb Ethernet
• Output frequency range: 140MHz - 170MHz,
560MHz - 680MHz
• VCO range: 560MHz - 680MHz
• Crystal oscillator and CLK range: 17.5MHz - 21.25MHz
• RMS phase jitter @ 622.08MHz output, using a 19.44MHz
crystal (12kHz - 20MHz): 0.82ps (typical)
• RMS phase jitter @ 156.25MHz output, using a 19.53125MHz
crystal (1.875MHz - 20MHz): 0.57ps (typical)
• RMS phase jitter @ 155.52MHz output, using a 19.44MHz
crystal (12kHz - 20MHz): 0.94ps (typical)
• Full 3.3V supply mode
• -40°C to 85°C ambient operating temperature
• Available in lead-free RoHS compliant package
PIN ASSIGNMENT
BLOCK DIAGRAM
XTAL_IN
OSC
0
÷1
0
÷4
1
XTAL_OUT
CLK Pulldown
1
Phase
Detector
VCO
Q0
nQ0
INPUT_SEL Pulldown
M = ÷32
MR Pulldown
F_SEL0
Pullup
0
Q1
1
nQ1
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
nQ2
Q2
VCCO
Q3
nQ3
VEE
F_SEL2
INPUT_SEL
CLK
VEE
XTAL_IN
XTAL_OUT
843004I-04
F_SEL1 Pullup
0
1
F_SEL2
nQ1
Q1
VCCo
Q0
nQ0
MR
F_SEL3
nc
VCCA
F_SEL0
VCC
F_SEL1
Q2
nQ2
Pullup
0
Q3
1
nQ3
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
package body
G Package
Top View
F_SEL3 Pullup
843004I-04 REVISION A 5/27/15
1
©2015 Integrated Device Technology, Inc.
843004I-04 DATA SHEET
TABLE 1. PIN DESCRIPTIONS
Number
Name
1, 2
nQ1, Q1
Output
Differential output pair. LVPECL interface levels.
3, 22
VCCO
Power
Output supply pins.
4, 5
Q0, nQ0
Ouput
6
MR
Input
7,
10,
12,
18
8
F_SEL3,
F_SEL0,
F_SEL1,
F_SEL2
nc
9
VCCA
Power
Analog supply pin.
11
Power
15, 19
VCC
XTAL_OUT,
XTAL_IN
VEE
Core supply pin.
Parallel resonant crystal interface. XTAL_OUT is the output,
XTAL_IN is the input.
Negative supply pins.
16
CLK
Input
17
INPUT_SEL
Input
20, 21
nQ3, Q3
Output
23, 24
Q2, nQ2
Output
13, 14
Type
Description
Differential output pair. LVPECL interface levels.
Active HIGH Master Reset. When logic HIGH, the internal dividers are reset
causing the true outputs Qx to go low and the inverted outputs nQx
Pulldown
to go high. When logic LOW, the internal dividers and the outputs are enabled. LVCMOS/LVTTL interface levels.
Input
Pullup
Unused
Frequency select pins. LVCMOS/LVTTL interface levels. See Table 3.
No connect.
Input
Power
Pulldown LVCMOS/LVTTL clock input.
Selects between crystal or CLK inputs as the the PLL Reference source.
Pulldown Selects XTAL inputs when LOW. Selects CLK when HIGH. LVCMOS/LVTTL
interface levels.
Differential output pair. LVPECL interface levels.
Differential output pair. LVPECL interface levels.
NOTE: refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Pulldown and Pullup
TABLE 2. PIN CHARACTERISTICS
Symbol
Parameter
Test Conditions
Minimum
Typical
Maximum
Units
CIN
Input Capacitance
4
pF
RPULLDOWN
Input Pulldown Resistor
51
kΩ
RPULLUP
Input Pullup Resistor
51
kΩ
TABLE 3. OUTPUT CONFIGURATION AND FREQUENCY RANGE FUNCTION TABLE
Inputs
F_SELx
XTAL (MHz)
VCO
(MHz)
Divider Value
Output Frequency (MHz)
Q0/nQ0:Q3/nQ3
0
19.44
622.08
÷1
622.08
1
19.44
622.08
÷4
155.52
0
18.75
600
÷1
600
1
18.75
600
÷4
150
0
19.53125
625
÷1
625
1
19.53125
625
÷4
156.25
0
20.141601
644.5312
÷1
644.5312
1
20.141601
644.5312
÷4
161.13
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
2
Application
SONET/SDH
SATA
10 Gigabit Ethernet
10 Gigabit Ethernet
66B/64B FEC
REVISION A 5/27/15
843004I-04 DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC
4.6V
Inputs, VI
-0.5V to VCC + 0.5V
Outputs, IO
Continuous Current
Surge Current
50mA
100mA
Package Thermal Impedance, θJA
70°C/W (0 mps)
Storage Temperature, TSTG
-65°C to 150°C
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.
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = -40°C TO 85°C
Symbol
Parameter
Minimum
Typical
Maximum
Units
VCC
Core Supply Voltage
Test Conditions
3.135
3.3
3.465
V
VCCA
Analog Supply Voltage
3.135
3.3
3.465
V
VCCO
Output Supply Voltage
3.135
3.3
3.465
V
IEE
Power Supply Current
120
mA
ICCA
Analog Supply Current
10
mA
ICCO
Output Supply Current
120
mA
TABLE 4B. LVCMOS / LVTTL DC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = -40°C TO 85°C
Symbol
Parameter
VIH
Input High Voltage
VIL
Input Low Voltage
IIH
Input High Current
IIL
Input Low Current
Test Conditions
Minimum
Typical
Maximum
Units
2
VCC + 0.3
V
-0.3
0.8
V
CLK,
MR, INPUT_SEL
VCC = VIN = 3.465
150
µA
F_SEL0:F_SEL3
VCC = VIN = 3.465
5
µA
CLK,
MR, INPUT_SEL
VCC = 3.465V, VIN = 0V
-5
µA
F_SEL0:F_SEL3
VCC = 3.465V, VIN = 0V
-150
µA
TABLE 4C. LVPECL DC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = -40°C TO 85°C
Symbol
Parameter
Maximum
Units
VOH
Output High Voltage; NOTE 1
Test Conditions
Minimum
VCCO - 1.4
Typical
VCCO - 0.9
V
VOL
Output Low Voltage; NOTE 1
VCCO - 2.0
VCCO - 1.7
V
VSWING
Peak-to-Peak Output Voltage Swing
0.6
1.0
V
NOTE 1: Outputs terminated with 50 to VCCO - 2V.
Ω
REVISION A 5/17/15
3
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
843004I-04 DATA SHEET
TABLE 5. CRYSTAL CHARACTERISTICS
Parameter
Test Conditions
Minimum
Mode of Oscillation
Typical
Maximum
Units
Fundamental
Frequency
21.25
MHz
Equivalent Series Resistance (ESR)
17.5
50
Ω
Shunt Capacitance
7
pF
Drive Level
1
mW
NOTE: Characterized using an 18pF parallel resonant crystal.
TABLE 6. AC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = -40°C TO 85°C
Symbol
Parameter
fOUT
Output Frequency
tsk(o)
Output Skew; NOTE 1, 2, 3
tjit(Ø)
tR / tF
odc
RMS Phase Jitter (Random);
NOTE 4
Output Rise/Fall Time
Output Duty Cycle
Test Conditions
Minimum
Maximum
Units
Output Divider = ÷1
560
Typical
680
MHz
Output Divider = ÷4
140
170
MHz
75
ps
155.52MHz,
Integration Range: 12kHz - 20MHz
156.25MHz,
Integration Range: 1.875MHz - 20MHz
622.08MHz,
Integration Range: 12kHz - 20MHz
20% to 80%
175
675
ps
Output Divider = ÷4
48
52
%
60
%
0.94
ps
0.57
ps
82
ps
Output Divider = ÷1
40
NOTE 1: Defined as skew between outputs at the same supply voltages and with equal load conditions.
Measured at VCCO/2.
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 3: Output skew measurements taken with all outputs in the same divide configuration.
NOTE 4: Please refer to the Phase Noise Plot.
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
4
REVISION A 5/27/15
843004I-04 DATA SHEET
PARAMETER MEASUREMENT INFORMATION
3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT
OUTPUT SKEW
RMS PHASE JITTER
OUTPUT RISE/FALL TIME
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
REVISION A 5/17/15
5
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
843004I-04 DATA SHEET
APPLICATION INFORMATION
POWER SUPPLY FILTERING TECHNIQUES
As in any high speed analog circuitry, the power supply
pins are vulnerable to random noise. The 843004I-04 provides separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. VCC, VCCA, and
VDDO should be individually connected to the power supply
plane through vias, and bypass capacitors should be
used for each pin. To achieve optimum jitter performance,
power supply isolation is required. Figure 1 illustrates how
a 10Ω resistor along with a 10µF and a .01μF bypass
capacitor should be connected to each VCCA.
3.3V
VCC
.01μF
10Ω
VCCA
.01μF
10μF
FIGURE 1. POWER SUPPLY FILTERING
CRYSTAL INPUT INTERFACE
2 below were determined using a 19.44MHz, 18pF parallel
resonant crystal and were chosen to minimize the ppm error.
The 843004I-04 has been character ized with 18pF
parallel resonant crystals. The capacitor values shown in Figure
XTAL_IN
C1
22pF
X1
18pF Parallel Crystal
XTAL_OUT
C2
22pF
Figure 2. CRYSTAL INPUt INTERFACE
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
6
REVISION A 5/27/15
843004I-04 DATA SHEET
LVCMOS TO XTAL INTERFACE
The XTAL_IN input can accept a single-ended LVCMOS
signal through an AC couple capacitor. A general interface
diagram is shown in Figure 3. The XTAL_OUT pin can
be left floating. The input edge rate can be as slow as
10ns. For LVCMOS inputs, it is recommended that the
amplitude be reduced from full swing to half swing in order
to prevent signal interference with the power rail and to
reduce noise. This configuration requires that the output
impedance of the driver (Ro) plus the series resistance
(Rs) equals the transmission line impedance. In addition,
matched termination at the crystal input will attenuate the
signal in half. This can be done in one of two ways. First,
R1 and R2 in parallel should equal the transmission line impedance. For most 50Ω applications, R1 and R2 can be 100Ω. This
can also be accomplished by removing R1 and making R2 50Ω.
VDD
VDD
R1
Ro
Rs
.1uf
Zo = 50
XTAL_IN
R2
Zo = Ro + Rs
XTAL_OUT
FIGURE 3. GENERAL DIAGRAM FOR LVCMOS DRIVER TO XTAL INPUT INTERFACE
RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS
INPUTS:
OUTPUTS:
CRYSTAL INPUT:
For applications not requiring the use of the crystal oscillator
input, both XTAL_IN and XTAL_OUT can be left floating. Though
not required, but for additional protection, a 1kΩ resistor can be
tied from XTAL_IN to ground.
LVPECL OUTPUT
All unused LVPECL outputs can be left floating. We recommend
that there is no trace attached. Both sides of the differential
output pair should either be left floating or terminated.
CLK INPUT:
For applications not requiring the use of a clock input, it can be
left floating. Though not required, but for additional protection, a
1kΩ resistor can be tied from the CLK input to ground.
LVCMOS CONTROL PINS:
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1kΩ resistor can be used.
REVISION A 5/17/15
7
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
843004I-04 DATA SHEET
TERMINATION FOR 3.3V LVPECL OUTPUT
The clock layout topology shown below is a typical termination
for LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
should be used to maximize operating frequency and minimize
signal distortion. Figures 4A and 4B show two different layouts
which are recommended only as guidelines. Other suitable clock
layouts may exist and it would be recommended that the board
designers simulate to guarantee compatibility across all printed
circuit and clock component process variations.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, terminating resistors (DC current path to ground) or current sources
must be used for functionality. These outputs are designed to
drive 50Ω transmission lines. Matched impedance techniques
FIGURE 4A. LVPECL OUTPUT TERMINATION
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
FIGURE 4B. LVPECL OUTPUT TERMINATION
8
REVISION A 5/27/15
843004I-04 DATA SHEET
SCHEMATIC EXAMPLE
Figure 5 shows a schematic example for 843004I-04. In this
example, the input is a 19.44MHz parallel resonant crystal
with load capacitor CL=18pF. The 22pF frequency fine tuning
capacitors are used C1 and C2. This example also shows
general logic control input handling. For decoupling capacitors,
it is recommended to have one decouple capacitor per power
pin. Each decoupling capacitor should be located as close as
possible to the power pin. The low pass filter R2, C3 and C4
should also be located as close to the VCCA pin as possible.
MR
F_SEL3
VCC
VCCA
R2
10
3.3V
C3
10uF
C4
0.01u
VCCO
VCC
Logic Control Input Examples
VDD
F_SEL1
Zo = 50 Ohm
XTAL_OUT
XTAL_IN
VEE
CLK
INPUT_SEL
F_SEL2
VEE
nQ3
Q3
VCCO
Q2
nQ2
To Logic
Input
pins
RD1
Not Install
VCC
+
RU2
Not Install
To Logic
Input
pins
(U1-3)
F_SEL0
F_SEL1
VCC
F_SEL0
VCCA
NC
F_SEL3
MR
nQ0
Q0
VCCO
Q1
nQ1
RU1
1K
RD2
1K
(U1-11)
R5
133
-
R4
82.5
U1
843004i-04
R6
82.5
VCC=3.3V
VCCO=3.3V
13
14
15
16
17
18
19
20
21
22
23
24
VDD
Set Logic
Input to
'0'
R3
133
12
11
10
9
8
7
6
5
4
3
2
1
Set Logic
Input to
'1'
Zo = 50 Ohm
(U1-22)
Zo = 50 Ohm
C1
0.1uF
C2
0.1uF
+
C3
0.1uF
C2
22pF
Zo = 50 Ohm
X1
19.44MHz
18pF
VCC
VCCO
R5
50
C1
22pF
Q1
Ro ~ 7 Ohm
R8
Optional
Y-Termination
Zo = 50 Ohm
R6
50
R7
50
43
Driv er_LVCMOS
INPUT_SEL
F_SEL2
FIGURE 5. ICS844004I-04 SCHEMATIC EXAMPLE
REVISION A 5/17/15
9
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
843004I-04 DATA SHEET
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the 843004I-04.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the 843004I-04 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.3V + 5% = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
•
•
Power (core)MAX = VCC_MAX * IEE_MAX = 3.465V * 120mA = 415.8mW
Power (outputs)MAX = 30.2mW/Loaded Output pair
If all outputs are loaded, the total power is 4 * 30mW = 120mW
Total Power_MAX (3.465V, with all outputs switching) = 415.8 + 120mW = 535.8mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of
the device. The maximum recommended junction temperature for the devices is 125°C.
The equation for Tj is as follows: Tj = θJA * Pd_total + TA
Tj = Junction Temperature
θJA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance θJA must be used. Assuming
an air flow of 1 meter per second and a multi-layer board, the appropriate value is 65°C/W per Table 7 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.536W * 65°C/W = 119.8°C. This is below the limit of 125°C.
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow,
and the type of board (single layer or multi-layer).
TABLE 7. THERMAL RESISTANCE θJA FOR 24-LEAD TSSOP, FORCED CONVECTION
θJA by Velocity (Meters per Second)
Multi-Layer PCB, JEDEC Standard Test Boards
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
10
0
1
2.5
70°C/W
65°C/W
62°C/W
REVISION A 5/27/15
843004I-04 DATA SHEET
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in the Figure 6.
FIGURE 6. LVPECL DRIVER CIRCUIT AND TERMINATION
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a
termination voltage of VCC- 2V.
•
For logic high, VOUT = VOH_MAX = VCC_MAX – 0.9V
(VCC_MAX - VOH_MAX) = 0.9V
•
For logic low, VOUT = VOL_MAX = VCC_MAX – 1.7V
(VCC_MAX - VOL_MAX) = 1.7V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(VOH_MAX – (VCC_MAX - 2V))/RL] * (VCC_MAX - VOH_MAX) = [(2V - (VCC_MAX - VOH_MAX))/RL] * (VCC_MAX - VOH_MAX) =
[(2V - 0.9V)/50Ω] * 0.9V = 19.8mW
Pd_L = [(VOL_MAX – (VCC_MAX - 2V))/RL] * (VCC_MAX - VOL_MAX) = [(2V - (VCC_MAX - VOL_MAX))/RL] * (VCC_MAX - VOL_MAX) =
[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
REVISION A 5/17/15
11
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
843004I-04 DATA SHEET
RELIABILITY INFORMATION
TABLE 8. θJAVS. AIR FLOW TABLE FOR 24 LEAD TSSOP
θJA by Velocity (Meters per Second)
Multi-Layer PCB, JEDEC Standard Test Boards
0
1
2.5
70°C/W
65°C/W
62°C/W
TRANSISTOR COUNT
The transistor count for 843004I-04 is: 2273
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
12
REVISION A 5/27/15
843004I-04 DATA SHEET
PACKAGE OUTLINE - G SUFFIX FOR 24 LEAD TSSOP
TABLE 9. PACKAGE DIMENSIONS
SYMBOL
Millimeters
Minimum
N
Maximum
24
A
--
1.20
A1
0.05
0.15
A2
0.80
1.05
b
0.19
0.30
c
0.09
0.20
D
7.70
7.90
E
E1
6.40 BASIC
4.30
e
4.50
0.65 BASIC
L
0.45
0.75
α
0°
8°
aaa
--
0.10
Reference Document: JEDEC Publication 95, MO-153
REVISION A 5/17/15
13
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
843004I-04 DATA SHEET
TABLE 10. ORDERING INFORMATION
Part/Order Number
Marking
Package
Shipping Packaging
Temperature
843004AGI-04LF
ICS43004AI04L
24 Lead “Lead-Free” TSSOP
tube
-40°C to 85°C
843004AGI-04LFT
ICS43004AI04L
24 Lead “Lead-Free” TSSOP
tape & reel
-40°C to 85°C
NOTE: Parts that are ordered with an “LF” suffix to the part number are the Pb-Free configuration and are RoHS compliant.
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
14
REVISION A 5/27/15
843004I-04 DATA SHEET
REVISION HISTORY SHEET
Rev
A
A
REVISION A 5/17/15
Table
Page
T10
14
16
T10
14
Description of Change
Updated datasheet’s header/footer with IDT from ICS.
Removed ICS prefix from Part/Order Number column.
Added Contact Page.
Updated data sheet format.
Ordering Information - Removed leaded devices.
15
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO3.3V LVPECL FREQUENCY SYNTHESIZER
Date
7/26/10
5/17/15
Corporate Headquarters
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800-345-7015 or +408-284-8200
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Technical Support
email: clocks@idt.com
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this document, including descriptions of product features and performance, is subject to change without notice. Performance specifications and the operating parameters of the described products are determined
in the independent state and are not guaranteed to perform the same way when installed in customer products. The information contained herein is provided without representation or warranty of any kind, whether express or implied, including, but not limited to, the suitability of IDT’s products for any particular purpose, an implied warranty of merchantability, or non-infringement of the intellectual property rights of others.
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(Rev.1.0 Mar 2020)
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