FemtoClock® Crystal-to-3.3V, 2.5V
LVPECL Clock Generator
843021I-01
DATA SHEET
General Description
Features
The 843021I-01 is a Gigabit Ethernet Clock Generator. The
843021I-01 uses a 25MHz crystal to synthesize 125MHz. The
843021I-01 has excellent phase jitter performance, over the
1.875MHz – 20MHz integration range. The 843021I-01 is packaged
in a small 8-pin TSSOP, making it ideal for use in systems with
limited board space.
•
•
One differential 3.3V or 2.5V LVPECL output
•
•
•
Output frequency range: 125MHz, using a 25MHz crystal
•
•
•
Full 3.3V or 2.5V operating supply
Block Diagram
Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
VCO range: 490MHz – 640MHz
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz – 20MHz): 0.41ps (typical)
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) package
Pin Assignment
OE Pullup
25MHz
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
÷4
(fixed)
Q
nQ
1
2
3
4
8
7
6
5
Q
nQ
VCC
OE
843021I-01
8 Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
÷20
(fixed)
843021I-01 Rev A 9/25/15
VCC
XTAL_OUT
XTAL_IN
VEE
#
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Table 1. Pin Descriptions
Number
Name
Type
Description
1, 6
VCC
Power
Power supply pins.
2,
3
XTAL_OUT
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
4
VEE
Power
Negative supply pin.
5
OE
Input
7, 8
nQ, Q
Output
Pullup
Active high output enable. When logic HIGH, the outputs are enabled and active.
When logic LOW, the outputs are disabled and are in a high impedance state.
LVCMOS/LVTTL interface levels.
Differential output pair. LVPECL interface levels.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Symbol
Parameter
Test Conditions
Minimum
Typical
Maximum
Units
CIN
Input Capacitance
4
pF
RPULLUP
Input Pullup Resistor
51
k
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, VCC
4.6V
Inputs, VI
-0.5V to VCC+ 0.5V
Outputs, IO
Continuos Current
Surge Current
50mA
100mA
Package Thermal Impedance, JA
129.5C/W (0 mps)
Storage Temperature, TSTG
-65C to 150C
DC Electrical Characteristics
Table 3A. Power Supply DC Characteristics, VCC = 3.3V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
VCC
Positive Supply Voltage
IEE
Power Supply Current
Test Conditions
Minimum
Typical
Maximum
Units
3.135
3.3
3.465
V
64
mA
Table 3B. Power Supply DC Characteristics, VCC = 2.5V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
VCC
Positive Supply Voltage
IEE
Power Supply Current
843021I-01 Rev A 9/25/15
Test Conditions
2
Minimum
Typical
Maximum
Units
2.375
2.5
2.625
V
62
mA
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Table 3C. LVCMOS/LVTTL DC Characteristics, VCC = 3.3V ± 5% or 2.5V ± 5%, VEE = 0V, TA = 0°C to 70°C
Symbol
Parameter
Test Conditions
Minimum
VIH
Input High Voltage
VCC = 3.3V
VIL
Input Low Voltage
IIH
Input High Current
VCC = VIN = 3.465 or 2.625V
IIL
Input Low Current
VCC = 3.465V or 2.625V, VIN = 0V
Typical
Maximum
Units
2
VCC + 0.3
V
VCC = 2.5V
1.7
VCC + 0.3
V
VCC = 3.3V
-0.3
0.8
V
VCC = 2.5V
-0.3
0.7
V
5
µA
-150
µA
Table 3D. LVPECL DC Characteristics, VCC = 3.3V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
VOH
Output High Voltage; NOTE 1
VOL
Output Low Voltage; NOTE 1
VSWING
Peak-to-Peak Output Voltage Swing
Test Conditions
Minimum
Typical
Maximum
Units
VCC – 1.4
VCC – 0.9
V
VCC – 2.0
VCC – 1.7
V
0.6
1.0
V
Maximum
Units
NOTE 1: Outputs termination with 50 to VCC – 2V.
Table 3E. LVPECL DC Characteristics, VCC = 2.5V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
Test Conditions
Minimum
Typical
VOH
Output High Voltage; NOTE 1
VCC – 1.4
VCC – 0.9
V
VOL
Output Low Voltage; NOTE 1
VCC – 2.0
VCC – 1.5
V
VSWING
Peak-to-Peak Output Voltage Swing
0.4
1.0
V
Maximum
Units
NOTE 1: Outputs termination with 50 to VCC – 2V.
Table 4. Crystal Characteristics
Parameter
Test Conditions
Minimum
Typical
Mode of Oscillation
Fundamental
Frequency; NOTE 1
25
MHz
Equivalent Series Resistance (ESR)
90
Shunt Capacitance
7
pF
300
µW
Drive Level
843021I-01 Rev A 9/25/15
3
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
AC Electrical Characteristics
Table 5A. AC Characteristics, VCC = 3.3V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
fOUT
Output Frequency
tjit(Ø)
RMS Phase Jitter, Random;
NOTE 1
tR / tF
Output Rise/Fall Time
odc
Output Duty Cycle
Test Conditions
Minimum
Typical
Maximum
Units
122.5
125
160
MHz
125MHz,
( Integration Range: 1.875MHz – 20MHz)
20% to 80%
0.41
ps
250
600
ps
49
51
%
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: Please refer to Phase Noise Plot.
Table 5B. AC Characteristics, VCC = 2.5V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
fOUT
Output Frequency
tjit(Ø)
RMS Phase Jitter, Random;
NOTE 1
tR / tF
Output Rise/Fall Time
odc
Output Duty Cycle
Test Conditions
Minimum
Typical
Maximum
Units
122.5
125
160
MHz
125MHz,
( Integration Range: 1.875MHz – 20MHz)
20% to 80%
0.42
ps
250
600
ps
49
51
%
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: Please refer to Phase Noise Plot.
843021I-01 Rev A 9/25/15
4
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
➝
Typical Phase Noise at 125MHz (3.3V or 2.5V)
Gigabit Ethernet Filter
Raw Phase Noise Data
➝
➝
Noise Power
dBc
Hz
125MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz (3.3V)= 0.41ps (typical)
1.875MHz to 20MHz (2.5V)= 0.42ps (typical)
Phase Noise Result by adding a
Gigabit Ethernet filter to raw data
Offset Frequency (Hz)
843021I-01 Rev A 9/25/15
5
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Parameter Measurement Information
2V
2V
VCC
SCOPE
Qx
VCC
Qx
SCOPE
nQx
nQx
VEE
VEE
-0.5V ± 0.125V
-1.3V ± 0.165V
3.3V LVPECL Output Load AC Test Circuit
2.5V LVPECL Output Load AC Test Circuit
Phase Noise Plot
Noise Power
nQ
Phase Noise Mask
Q
f1
Offset Frequency
f2
RMS Jitter = Area Under the Masked Phase Noise Plot
Output Rise/Fall Time
RMS Phase Jitter
nQ
Q
Output Duty Cycle/Pulse Width/Period
843021I-01 Rev A 9/25/15
6
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Applications Information
Crystal Input Interface
The 843021I-01 has been characterized with 18pF parallel resonant
crystals. The capacitor values, C1 and C2, shown in Figure 1 below
were determined using a 25MHz, 18pF parallel resonant crystal and
were chosen to minimize the ppm error. The optimum C1 and C2
values can be slightly adjusted for different board layouts.
XTAL_IN
C1
27pF
X1
18pF Parallel Crystal
XTAL_OUT
C2
27pF
Figure 1. Crystal Input Interface
Overdriving the XTAL Interface
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling capacitor. A general interface diagram is
shown in Figure 2A. 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,
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.
3.3V
3.3V
R1
100
Ro ~ 7 Ohm
C1
Zo = 50 Ohm
XTAL_IN
RS
43
R2
100
Driv er_LVCMOS
0.1uF
XTAL_OUT
Cry stal Input Interf ace
Figure 2A. General Diagram for LVCMOS Driver to XTAL Input Interface
VCC=3.3V
C1
Zo = 50 Ohm
XTAL_IN
R1
50
Zo = 50 Ohm
0.1uF
XTAL_OUT
LVPECL
Cry stal Input Interf ace
R2
50
R3
50
Figure 2B. General Diagram for LVPECL Driver to XTAL Input Interface
843021I-01 Rev A 9/25/15
7
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Termination for 3.3V LVPECL Outputs
The clock layout topology shown below is a typical termination for
LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
transmission lines. Matched impedance techniques should be used
to maximize operating frequency and minimize signal distortion.
Figures 3A and 3B 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.
The differential outputs 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 50
R3
125
3.3V
R4
125
3.3V
3.3V
Zo = 50
+
_
Input
Zo = 50
R1
84
Figure 3A. 3.3V LVPECL Output Termination
843021I-01 Rev A 9/25/15
R2
84
Figure 3B. 3.3V LVPECL Output Termination
8
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Termination for 2.5V LVPECL Outputs
ground level. The R3 in Figure 4B can be eliminated and the
termination is shown in Figure 4C.
Figure 4A and Figure 5B show examples of termination for 2.5V
LVPECL driver. These terminations are equivalent to terminating
50 to VCC – 2V. For VCC= 2.5V, the VCC– 2V is very close to
2.5V
VCC = 2.5V
2.5V
2.5V
VCC = 2.5V
R1
250Ω
R3
250Ω
50Ω
+
50Ω
+
50Ω
–
50Ω
2.5V LVPECL Driver
–
R1
50Ω
2.5V LVPECL Driver
R2
62.5Ω
R2
50Ω
R4
62.5Ω
R3
18Ω
Figure 4A. 2.5V LVPECL Driver Termination Example
Figure 4B. 2.5V LVPECL Driver Termination Example
2.5V
VCC = 2.5V
50Ω
+
50Ω
–
2.5V LVPECL Driver
R1
50Ω
R2
50Ω
Figure 4C. 2.5V LVPECL Driver Termination Example
843021I-01 Rev A 9/25/15
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©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Schematic Example
Figure 5 shows an example of 843021I-01 application schematic. In
this example, the device is operated at VCC = 3.3V. The decoupling
capacitor should be located as close as possible to the power pin.
The input is driven by a 25MHz quartz crystal. For the LVPECL output
drivers, only two termination examples are shown in this schematic.
Additional termination approaches are shown in the LVPECL
Termination Application Note.
VCC = 3.3V
3.3V
C2
27pF
R3
133
U1
R5
133
Zo = 50 Ohm
1
2
3
4
X1
25MHz
S)
VCC
XTAL_OUT
XTAL_IN
VEE
Q
nQ
VCC
OE
8
7
6
5
+
OE
Zo = 50 Ohm
-
843021I-01
C1
27pF
R4
82.5
R6
82.5
VCC
C3
10uF
C4
.1uF
C5
.1uF
Zo = 50
+
Zo = 50
-
R2
50
R1
50
R3
50
Optional Termination
Figure 5. 843021I-01 Schematic Example
Figure 5. 843021I-01 Schematic Example
843021I-01 Rev A 9/25/15
10
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Power Considerations
This section provides information on power dissipation and junction temperature for the 843021I-01.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the 843021I-01 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 * 64mA = 221.76mW
•
Power (outputs)MAX = 30mW/Loaded Output pair
Total Power_MAX (3.465V, with all outputs switching) = 221.76mW + 30mW = 251.76mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad directly affects the reliability of the device. The
maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond
wire and bond pad temperature remains below 125°C.
The equation for Tj is as follows: Tj = JA * Pd_total + TA
Tj = Junction Temperature
JA = 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 JA must be used. Assuming no air flow and
a multi-layer board, the appropriate value is 129.5°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.252W * 90.5°C/W = 117.6°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 (multi-layer).
Table 6. Thermal Resistance JA for 8 Lead TSSOP, Forced Convection
JA by Velocity
Meters per Second
Multi-Layer PCB, JEDEC Standard Test Boards
843021I-01 Rev A 9/25/15
0
1
2.5
129.5°C/W
125.5°C/W
123.5°C/W
11
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
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 Figure 6.
VCC
Q1
VOUT
RL
50Ω
VCC - 2V
Figure 6. LVPECL Driver Circuit and Termination
To calculate worst case power dissipation into the load, use the following equations which assume a 50 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)/50] * 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)/50] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
843021I-01 Rev A 9/25/15
12
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Reliability Information
Table 7. JA vs. Air Flow Table for a 8 Lead TSSOP
JA vs. Air Flow
Meters per Second
Multi-Layer PCB, JEDEC Standard Test Boards
0
1
2.5
129.5°C/W
125.5°C/W
123.5°C/W
Transistor Count
The transistor count for 843021I-01 is: 1765
Package Outline and Package Dimensions
Package Outline - G Suffix for 8 Lead TSSOP
Table 8. Package Dimensions
All Dimensions in Millimeters
Symbol
Minimum
Maximum
N
8
A
1.20
A1
0.05
0.15
A2
0.80
1.05
b
0.19
0.30
c
0.09
0.20
D
2.90
3.10
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
843021I-01 Rev A 9/25/15
13
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Ordering Information
Table 9. Ordering Information
Part/Order Number
843021AGI-01LF
843021AGI-01LFT
Marking
AI01L
AI01L
Package
“Lead-Free” 8 Lead TSSOP
“Lead-Free” 8 Lead TSSOP
Shipping Packaging
Tube
Tape & Reel
Temperature
-40C to 85C
-40C to 85C
NOTE: Parts that are ordered with an "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
843021I-01 Rev A 9/25/15
14
©2015 Integrated Device Technology, Inc.
843021I-01 Data Sheet
FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Revision History Sheet
Rev
Table
Page
A
T9
14
Ordering Information Table - corrected “Temperature” column.
5/14/08
A
T1
2
Pin Description Table - corrected typo in VCC row, pins 1, 6 instead of 1, 8.
11/10/08
T3D - T3E
3
LVPECL DC Characteristics Tables - corrected VOH/VOL parameters from “Current” to
“Voltage” and units from “uA” to “V”.
Updated “Overdriving the Crystal Interface” section.
Updated header/footer.
10/15/10
Ordering Information - removed leaded devices.
9/25/15
A
A
7
T9
843021I-01 Rev A 9/25/15
14
Description of Change
Date
15
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email: clocks@idt.com
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