FemtoClock®, Crystal-to-LVCMOS/LVTTL
Frequency Synthesizer
840002I-01
DATA SHEET
General Description
Features
The 840002I-01 is a two output LVCMOS/LVTTL Synthesizer
optimized to generate Ethernet reference clock frequencies. Using a
25MHz 18pF parallel resonant crystal, the following frequencies can
be generated based on the two frequency select pins (F_SEL[1:0]):
156.25MHz, 125MHz, and 62.5MHz. The 840002I-01 uses IDT’s 3RD
generation low phase noise VCO technology and can achieve 1ps or
lower typical random rms phase jitter, easily meeting Ethernet jitter
requirements. The 840002I-01 is packaged in a small 16-pin TSSOP
package.
•
Two LVCMOS/LVTTL outputs@ 3.3V,
17 typical output impedance
•
Selectable crystal oscillator interface or LVCMOS/LVTTL
single-ended TEST_CLK
•
Supports the following output frequencies: 156.25MHz, 125MHz
and 62.5MHz
•
•
•
•
Output frequency range: 56MHz to 175MHz
VCO range: 560MHz to 700MHz
Output skew: 12ps (maximum)
RMS phase jitter at 156.25MHz, (1.875MHz to 20MHz):
0.47ps (typical)
Phase Noise:
Offset
Noise Power
100Hz ................ -97.4 dBc/Hz
1kHz .................. -120.2 dBc/Hz
10kHz ................ -127.6 dBc/Hz
100kHz .............. -126.1 dBc/Hz
Frequency Select Function Table
Inputs
N Divider
Value
Output
Frequency
(25MHz Ref.)
F_SEL1
F_SEL0
M Divider
Value
0
0
25
4
156.25
0
1
25
5
125
1
0
25
10
62.5
1
1
25
5
125
•
Power Supply Modes:
Core / Output
3.3V / 3.3V
3.3V / 2.5V
2.5V / 2.5V
•
•
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) package
Pin Assignment
Block Diagram
OE
F_SEL1:0
F_SEL0
nXTAL_SEL
TEST_CLK
OE
MR
nPLL_SEL
VDDA
VDD
Pullup
2
Pullup:Pullup
nPLL_SEL
Pulldown
nXTAL_SEL
Pulldown
XTAL_IN
OSC
F_SEL1:0
0
1
XTAL_OUT
TEST_CLK
Pulldown
1
Phase
Detector
VCO
0
00
01
10
11
N
4
5
10
5
Q0
Q1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
F_SEL1
GND
GND
Q0
Q1
VDDO
XTAL_IN
XTAL_OUT
840002I-01
16-Lead TSSOP
4.4mm x 5.0mm x 0.925mm
package body
G Package
Top View
M = 25 (fixed)
MR
Pulldown
840002I-01 Rev B 8/5/15
1
©2015 Integrated Device Technology, Inc.
840002I-01 DATA SHEET
Table 1. Pin Descriptions
Number
Name
1
F_SEL0
Type
Input
Description
Pullup
2
nXTAL_SEL
Input
Pulldown
3
TEST_CLK
Input
Pulldown
Frequency select pin. LVCMOS/LVTTL interface levels.
Selects between crystal or TEST_CLK inputs as the PLL reference
source. When HIGH, selects TEST_CLK. When LOW, selects XTAL
inputs. LVCMOS/LVTTL interface levels.
Single-ended test clock input. LVCMOS/LVTTL interface levels.
4
OE
Input
Pullup
Output enable. When logic HIGH, the outputs are active. When LOW, the
outputs are in high-impedance state. LVCMOS/LVTTL interface levels.
5
MR
Input
Pulldown
Active High Master Reset. When logic HIGH, the internal dividers are
reset causing the active outputs to go low. When Logic LOW, the internal
dividers and the outputs are enabled. LVCMOS/LVTTL interface levels.
6
nPLL_SEL
Input
Pulldown
PLL Bypass. When LOW, the output is driven from the VCO output. When
HIGH, the PLL is bypassed and the output frequency = reference clock
frequency/N output divider. LVCMOS/LVTTL interface levels.
7
VDDA
Power
Analog supply pin.
8
VDD
Power
Core supply pin.
9,
10
XTAL_OUT
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the
output.
11
VDDO
Power
Output supply pin.
12, 13
Q1, Q0
Output
Single-ended clock outputs. LVCMOS/LVTTL interface levels.
14, 15
GND
Power
Power supply ground.
16
F_SEL1
Input
Pullup
Frequency select pin. LVCMOS/LVTTL interface levels.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Symbol
Parameter
CIN
Input Capacitance
4
pF
CPD
Power Dissipation Capacitance
8
pF
RPULLUP
Input Pullup Resistor
51
k
RPULLDOWN
Input Pulldown Resistor
51
k
ROUT
Output Impedance
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
Test Conditions
Minimum
Typical
Maximum
Units
VDDO = 3.3V ± 5%
14
17
21
VDDO = 2.5V ± 5%
16
21
25
2
Rev B 8/5/15
840002I-01 DATA SHEET
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
Rating
Supply Voltage, VDD
4.6V
Inputs, VI
XTAL_IN
Other Inputs
0V to VDD
-0.5V to VDD + 0.5V
Outputs, VO
-0.5V to VDDO + 0.5V
Package Thermal Impedance, JA
89C/W (0 lfpm)
Storage Temperature, TSTG
-65C to 150C
DC Electrical Characteristics
Table 3A. Power Supply DC Characteristics, VDD = VDDA = 3.3V±5%, VDDO = 3.3V±5% or 2.5V±5%, TA = -40°C to 85°C
Symbol
Parameter
VDD
Test Conditions
Minimum
Typical
Maximum
Units
Core Supply Voltage
3.135
3.3
3.465
V
VDDA
Analog Supply Voltage
3.135
3.3
3.465
V
3.135
3.3
3.465
V
VDDO
Output Supply Voltage
2.375
2.5
2.625
V
IDD
Power Supply Current
100
mA
IDDA
Analog Supply Current
12
mA
IDDO
Output Supply Current
5
mA
Table 3B. Power Supply DC Characteristics, VDD = VDDA = VDDO = 2.5V±5%, TA = -40°C to 85°C
Symbol
Parameter
VDD
Minimum
Typical
Maximum
Units
Core Supply Voltage
2.375
2.5
2.625
V
VDDA
Analog Supply Voltage
2.375
2.5
2.625
V
VDDO
Output Supply Voltage
2.375
2.5
2.625
V
IDD
Power Supply Current
95
mA
IDDA
Analog Supply Current
12
mA
IDDO
Output Supply Current
5
mA
Rev B 8/5/15
Test Conditions
3
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
840002I-01 DATA SHEET
Table 3C. LVCMOS/LVTTL DC Characteristics, VDD = VDDA = VDDO = 3.3V±5% or 2.5V±5%; or
VDD = VDDA = 3.3V±5%, VDDO = 2.5V±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
VDD = 3.3V
Typical
Maximum
Units
2
VDD + 0.3
V
VDD = 2.5V
1.7
VDD + 0.3
V
VDD = 3.3V
-0.3
0.8
V
VDD = 2.5V
-0.3
0.7
V
OE, F_SEL0, F_SEL1
VDD = VIN = 3.465V or 2.625V
5
µA
MR, TEST_CLK,
nXTAL_SEL, nPLL_SEL
VDD = VIN =3.465V or 2.625V
150
µA
OE, F_SEL0, F_SEL1
VDD = 3.465V or 2.625V,
VIN = 0V
-150
µA
MR, TEST_CLK,
nXTAL_SEL, nPLL_SEL
VDD = 3.465V or 2.625V,
VIN = 0V
-5
µA
VDDO = 3.3V±5%
2.6
V
VDDO = 2.5V±5%
1.8
V
VOH
Output High Voltage; NOTE 1
VOL
Output Low Voltage; NOTE 1
VDDO = 3.3V±5% or 2.5V±5%
0.5
V
NOTE 1: Outputs terminated with 50 to VDDO/2. See Parameter Measurement Information section, Output Load Test Circuit diagrams.
Table 4. Crystal Characteristics
Parameter
Test Conditions
Mode of Oscillation
Minimum
Typical
Maximum
Units
Fundamental
Frequency
25
MHz
Equivalent Series Resistance (ESR)
50
Shunt Capacitance (CO)
7
pF
NOTE: Characterized using an 18pF parallel resonant crystal.
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
4
Rev B 8/5/15
840002I-01 DATA SHEET
AC Electrical Characteristics
Table 5A. AC Characteristics, VDD = VDDA = VDDO = 3.3V±5%, TA = -40°C to 85°C
Symbol
fOUT
tsk(o)
tjit(Ø)
Parameter
Output Frequency
Test Conditions
Minimum
F_SEL[1:0] = 00
Typical
Maximum
Units
140
175
MHz
F_SEL[1:0] = 01 or 11
112
140
MHz
F_SEL[1:0] = 10
56
70
MHz
12
ps
Output Skew; NOTE 1, 2
RMS Phase Jitter, Random; NOTE 3
tR / tF
Output Rise/Fall Time
odc
Output Duty Cycle
156.25MHz, (1.875MHz - 20MHz)
0.47
ps
125MHz, (1.875MHz - 20MHz)
0.57
ps
62.5MHz, (1.875MHz - 20MHz)
0.51
ps
20% to 80%
200
700
ps
46
54
%
NOTE: Electrical parameters are guaranteed over the specified ambient operating temperature range, which is established when the device is
mounted in a test socket with maintained transverse airflow greater than 500 lfpm. The device will meet specifications after thermal equilibrium
has been reached under these conditions.
NOTE 1: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDO/2.
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 3: Refer to Phase Noise Plots.
Table 5B. AC Characteristics, VDD = VDDA = 3.3V±5%, VDDO = 2.5V±5%, TA = -40°C to 85°C
Symbol
fOUT
tsk(o)
tjit(Ø)
Parameter
Output Frequency
Test Conditions
Minimum
F_SEL[1:0] = 00
Typical
Maximum
Units
140
175
MHz
F_SEL[1:0] = 01 or 11
112
140
MHz
F_SEL[1:0] = 10
56
70
MHz
12
ps
Output Skew; NOTE 1, 2
RMS Phase Jitter, Random; NOTE 3
tR / tF
Output Rise/Fall Time
odc
Output Duty Cycle
156.25MHz, (1.875MHz - 20MHz)
0.47
ps
125MHz, (1.875MHz - 20MHz)
0.55
ps
62.5MHz, (1.875MHz - 20MHz)
0.49
ps
20% to 80%
200
700
ps
46
54
%
Maximum
Units
For NOTES, see Table 5A above.
Table 5C. AC Characteristics, VDD = VDDA = VDDO = 2.5V±5%, TA = -40°C to 85°C
Symbol
Parameter
fOUT
Output Frequency
tsk(o)
Output Skew; NOTE 1, 2
tjit(Ø)
RMS Phase Jitter, Random; NOTE 3
tR / tF
Output Rise/Fall Time
odc
Output Duty Cycle
Test Conditions
Minimum
Typical
F_SEL[1:0] = 00
140
175
MHz
F_SEL[1:0] = 01 or 11
112
140
MHz
F_SEL[1:0] = 10
56
70
MHz
12
ps
156.25MHz, (1.875MHz - 20MHz)
0.49
ps
125MHz, (1.875MHz - 20MHz)
0.56
ps
62.5MHz, (1.875MHz - 20MHz)
20% to 80%
fOUT = 125MHz
0.52
ps
200
700
ps
46
54
%
47
53
%
For NOTES, see Table 5A above.
Rev B 8/5/15
5
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
840002I-01 DATA SHEET
➝
Typical Phase Noise at 62.5MHz (3.3V)
1Gb Ethernet Filter
Raw Phase Noise Data
➝
➝
Noise Power
dBc
Hz
62.5MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.51ps (typical)
Phase Noise Result by adding a
1Gb Ethernet filter to raw data
Offset Frequency (Hz)
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
6
Rev B 8/5/15
840002I-01 DATA SHEET
➝
Typical Phase Noise at 156.25MHz (3.3V)
10Gb Ethernet Filter
Raw Phase Noise Data
➝
➝
Noise Power
dBc
Hz
156.25MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.47ps (typical)
Phase Noise Result by adding a
10Gb Ethernet filter to raw data
Offset Frequency (Hz)
Rev B 8/5/15
7
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
840002I-01 DATA SHEET
Parameter Measurement Information
1.65V±5%
2.05V±5%
1.25V±5%
SCOPE
VDD,
VDDA,
VDDO
SCOPE
VDD,
VDDA
Qx
VDDO
LVCMOS
Qx
GND
GND
VDDO
2
-1.65V±5%
-1.25V±5%
3.3V Core/2.5V Output Load AC Test Circuit
3.3V Core/3.3V Output Load AC Test Circuit
1.25V±5%
Noise Power
Phase Noise Plot
SCOPE
VDD,
VDDA,
VDDO
Qx
Phase Noise Mask
GND
f1
Offset Frequency
f2
RMS Jitter = Area Under the Masked Phase Noise Plot
-1.25V±5%
RMS Phase Jitter
2.5V Core/2.5V Output Load AC Test Circuit
V
V
DDO
DDO
Qx
2
Q[0:1]
2
t PW
t
V
PERIOD
DDO
Qy
2
tsk(o)
odc =
t PW
x 100%
t PERIOD
Output Skew
Output Duty Cycle/Pulse Width/Period
Q[0:1]
80%
80%
tR
tF
20%
20%
Output Rise/Fall Time
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
8
Rev B 8/5/15
840002I-01 DATA SHEET
Applications Information
Recommendations for Unused Input and Output Pins
Inputs:
Outputs:
Crystal Inputs
LVCMOS Outputs
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 1k resistor can be tied from
XTAL_IN to ground.
All unused LVCMOS outputs can be left floating. We recommend that
there is no trace attached.
TEST_CLK Input
For applications not requiring the use of the test clock, it can be left
floating. Though not required, but for additional protection, a 1k
resistor can be tied from the TEST_CLK to ground.
LVCMOS Control Pins
All control pins have internal pullups or pulldowns; additional
resistance is not required but can be added for additional protection.
A 1k resistor can be used.
Rev B 8/5/15
9
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
840002I-01 DATA SHEET
Overdriving the XTAL Interface
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 50
applications, R1 and R2 can be 100. This can also be
accomplished by removing R1 and making R2 50. By overdriving
the crystal oscillator, the device will be functional, but note, the device
performance is guaranteed by using a quartz crystal.
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling capacitor. A general interface diagram is
shown in Figure 1A. The XTAL_OUT pin can be left floating. The
maximum amplitude of the input signal should not exceed 2V and the
input edge rate can be as slow as 10ns. This configuration requires
that the output impedance of the driver (Ro) plus the series
resistance (Rs) equals the transmission line impedance. In addition,
Figure 1A. General Diagram for LVCMOS Driver to XTAL Input Interface
Figure 1B. General Diagram for LVPECL Driver to XTAL Input Interface
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
10
Rev B 8/5/15
840002I-01 DATA SHEET
Layout Guideline
0.1uF capacitor in each power pin filter should be placed on the
device side of the PCB and the other components can be placed on
the opposite side.
Figure 2 shows a schematic example of the 840002I-01 application
schematic. In this example, the device is operated at VDD = VDDA =
VDDO = 3.3V. The 18pF parallel resonant 25MHz crystal is used. The
load capacitance C1 = 22pF and C2 = 22pF are recommended for
frequency accuracy. Depending on the parasitic of the printed circuit
board layout, these values might require a slight adjustment to
optimize the frequency accuracy. Crystals with other load
capacitance specifications can be used. This will required adjusting
C1 and C2.
Power supply filter recommendations are a general guideline to be
used for reducing external noise from coupling into the devices. The
filter performance is designed for wide range of noise frequencies.
This low-pass filter starts to attenuate noise at approximately 10kHz.
If a specific frequency noise component is known, such as switching
power supply frequencies, it is recommended that component values
be adjusted and if required, additional filtering be added. Additionally,
good general design practices for power plane voltage stability
suggests adding bulk capacitances in the local area of all devices.
As with any high speed analog circuitry, the power supply pins are
vulnerable to noise. To achieve optimum jitter performance, power
supply isolation is required. The 840002I-01 provides separate power
supplies to isolate from coupling into the internal PLL.
The schematic example focuses on functional connections and is not
configuration specific. Refer to the pin description and functional
tables in the datasheet to ensure the logic control inputs are properly
set.
In order to achieve the best possible filtering, it is recommended that
the placement of the filter components be on the device side of the
PCB as close to the power pins as possible. If space is limited, the
Figure 2. 840002I-01 Application Schematic Example
Rev B 8/5/15
11
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
840002I-01 DATA SHEET
Reliability Information
Table 6. JA vs. Air Flow Table for a 16 Lead TSSOP
JA by Velocity
Linear Feet per Minute
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards
137.1°C/W
118.2°C/W
106.8°C/W
Multi-Layer PCB, JEDEC Standard Test Boards
89.0°C/W
81.8°C/W
78.1°C/W
Transistor Count
The transistor count for 840002I-01 is: 3356
Package Outline and Package Dimensions
Package Outline - G Suffix for 16 Lead TSSOP
Table 7. Package Dimensions for 16 Lead TSSOP
All Dimensions in Millimeters
Symbol
Minimum
Maximum
N
16
A
1.20
A1
0.5
0.15
A2
0.80
1.05
b
0.19
0.30
c
0.09
0.20
D
4.90
5.10
E
6.40 Basic
E1
4.30
4.50
e
0.65 Basic
L
0.45
0.75
0°
8°
aaa
0.10
Reference Document: JEDEC Publication 95, MO-153
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
12
Rev B 8/5/15
840002I-01 DATA SHEET
Ordering Information
Table 8. Ordering Information
Part/Order Number
840002AGI-01LF
840002AGI-01LFT
Marking
002AI01L
002AI01L
Package
“Lead-Free”, 16 Lead LQFP
“Lead-Free”, 16 Lead LQFP
Shipping Packaging
Tube
Tape & Reel
Temperature
-40°C to 85°C
-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.
Rev B 8/5/15
13
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
840002I-01 DATA SHEET
Revision History Sheet
Rev
A
A
Table
Page
T8
12
T8
12
14
T5A - T5C
4-5
8
9
10
A
T5B
5
T5C
5
8
8
9
10
B
Description of Change
Date
Ordering Information Table - corrected standard marking and added Lead-Free part
number, marking and note.
10/18/07
Updated datasheet's header/footer with IDT from ICS.
Removed ICS prefix from Part/Order Number column.
Added Contact Page.
11/18/10
AC Characteristics Tables - added thermal note.
Power Supply Filtering Techniques - corrected figure 1.
Added Overdriving the Crystal Interface section.
Added Recommendations for Unused Input & Output Pins section.
12/6/10
3.3V/2.5V AC Characteristics Table -corrected FOUT from 56MHz min - 68MHz max to
56MHz min - 70MHz max.
2.5V AC Characteristics Table - added 2nd odc spec and added thermal note.
Corrected FOUT from 56MHz min - 68MHz max to 56MHz min - 70MHz max.
Deleted Power Supply Filtering Techniques section, added to schematic layout.
Deleted Crystal Input Interface section.
Added Overdriving the XTAL Interface section.
Updated Layout Guideline and diagram.
Converted datasheet format.
2/3/11
B
5A, 5B, 5C
5
AC Table; fOUT = F_SEL[1:0] = 01 or 11, F_SEL[1:0] = 10
B
8
13
Deleted Quantity from Tape and Reel
T8
13
Ordering Information - removed leaded devices.
Updated data sheet format.
B
FEMTOCLOCK®, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY
SYNTHESIZER
14
9/28/12
8/5/15
Rev B 8/5/15
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Tech Support
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Fax: 408-284-2775
www.IDT.com
email: clocks@idt.com
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(Rev.1.0 Mar 2020)
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