FemtoClock
®
Crystal-to-3.3V, 2.5V
LVPECL Clock Generator
ICS843071I
DATA SHEET
General Description
The ICS843071I is a Serial ATA (SATA)/Serial Attached SCSI (SAS)
Clock Generator. The ICS843071I uses an 18pF parallel resonant
crystal over the range of 20.833MHz - 28.3MHz. For SATA/SAS
applications, a 25MHz crystal is used and either 75MHz or 150MHz
may be selected with the FREQ_SEL pin. For 10Gb Fibre Channel
applications, a 26.5625MHz crystal is used for 159.375MHz output.
The ICS843071I has excellent <1ps phase jitter performance, over
the 12kHz - 20MHz integration range. The ICS843071I is packaged
in a small 8-pin TSSOP, making it ideal for use in systems with
limited board space.
Features
•
•
•
•
•
•
•
•
•
One differential 3.3V or 2.5V LVPECL output
Crystal oscillator interface,18pF parallel resonant crystal
(20.833MHz – 28.3MHz)
Output frequency range: 62.5MHz – 170MHz
VCO range: 500MHz – 680MHz
RMS phase jitter at 150MHz, using a 25MHz crystal
(12kHz – 20MHz): 0.64ps (typical) @ 3.3V output
RMS phase jitter at 159.375MHz, using a 26.5625MHz crystal
(1.875MHz – 20MHz): 0.40ps (typical) @ 3.3V output
Full 3.3V or 2.5V operating supply
-40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Common Configuration Table - Serial ATA/Serial Attached SCSI
Inputs
Crystal Frequency (MHz)
25
25
26.5625
FREQ_SEL
0
1
0
M
24
24
24
N
4
8
4
Multiplication Value M/N
6
3
6
Output Frequency (MHz)
150
75
159.375
Block Diagram
FREQ_SEL
Pullup
Pin Assignment
V
CCA
XTAL_OUT
XTAL_IN
V
EE
1
2
3
4
8
7
6
5
V
CC
Q
nQ
FREQ_SEL
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
500MHz - 680MHz
FREQ_SEL N
0
÷4
1
÷8
Q0
nQ0
M = ÷24
(fixed)
ICS843071I
8 Lead TSSOP
4.40mm x 3.0mm x 0.925
package body
G Package
Top View
ICS843071AGI REVISION B OCTOBER 13, 2010
1
©2010 Integrated Device Technology, Inc.
ICS843071I Data Sheet
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
XTAL_OUT
XTAL_IN
V
EE
FREQ_SEL
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.
Frequency select pin. 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
ICS843071AGI REVISION B OCTOBER 13, 2010
2
©2010 Integrated Device Technology, Inc.
ICS843071I Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
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
Continuous Current
Surge Current
Package Thermal Impedance,
θ
JA
Storage Temperature, T
STG
Rating
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
101.7°C/W (0 mps)
-65°C to 150°C
DC Electrical Characteristics
Table 3A. Power Supply DC Characteristics,
V
CC
= V
CCA
= 3.3V ± 10%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
CC
V
CCA
I
CC
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Power Supply Current
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
3.0
3.0
Typical
3.3
3.3
Maximum
3.63
3.63
96
12
72
Units
V
V
mA
mA
mA
Table 3B. Power Supply DC Characteristics,
V
CC
= V
CCA
= 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
CC
V
CCA
I
CC
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Power Supply Current
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
2.375
2.375
Typical
2.5
2.5
Maximum
2.625
2.625
72
12
72
Units
V
V
mA
mA
mA
Table 3C. LVCMOS/LVTTL DC Characteristics,
V
CC
= V
CCA
= 3.3V ± 10%, 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
IH
Parameter
Input High Voltage
2.5V
3.3V
V
IL
I
IH
I
IL
Input Low Voltage
2.5V
Input High Current
Input Low Current
V
CC
= V
IN
= 3.63V or 2.625V
V
CC
= 3.63V or 2.625V, V
IN
= 0V
-150
-0.3
0.7
5
V
µA
µA
1.7
-0.3
Test Conditions
3.3V
Minimum
2
Typical
Maximum
V
CC
+ 0.3
V
CC
+ 0.3
0.8
Units
V
V
V
ICS843071AGI REVISION B OCTOBER 13, 2010
3
©2010 Integrated Device Technology, Inc.
ICS843071I Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Table 3D. LVPECL DC Characteristics,
V
CC
= V
CCA
= 3.3V ± 10%, 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
OH
V
OL
V
SWING
Parameter
Output High Voltage; NOTE 1
Output Low Voltage; 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
V
V
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
Drive Level
20.833
Test Conditions
Minimum
Typical
Fundamental
28.3
50
7
1
MHz
Maximum
Units
Ω
pF
mW
AC Electrical Characteristics
Table 5A. AC Characteristics,
V
CC
= 3.3V ± 10%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
f
OUT
Parameter
Output Frequency
150MHz, Integration Range: 12kHz – 20MHz
tjit(Ø)
RMS Phase Jitter,
Random; NOTE 1
Output Rise/Fall Time
Output Duty Cycle
75MHz, Integration Range: 12kHz – 20MHz
159.375MHz,
Integration Range: 1.875MHz – 20MHz
20% to 80%
250
48
Test Conditions
Minimum
62.5
0.64
0.64
0.40
500
52
Typical
Maximum
170
Units
MHz
ps
ps
ps
ps
%
t
R
/ t
F
odc
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 Plots.
Table 5B. AC Characteristics,
V
CC
= 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
f
OUT
Parameter
Output Frequency
150MHz, Integration Range: 12kHz – 20MHz
tjit(Ø)
RMS Phase Jitter,
Random; NOTE 1
Output Rise/Fall Time
Output Duty Cycle
75MHz, Integration Range: 12kHz – 20MHz
159.375MHz,
Integration Range: 1.875MHz – 20MHz
20% to 80%
250
48
Test Conditions
Minimum
62.5
0.94
0.80
0.42
500
52
Typical
Maximum
170
Units
MHz
ps
ps
ps
ps
%
t
R
/ t
F
odc
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 Plots.
ICS843071AGI REVISION B OCTOBER 13, 2010
4
©2010 Integrated Device Technology, Inc.
ICS843071I Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Typical Phase Noise at 75MHz (3.3V)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
-200
➝
➝
Filter
75MHz
RMS Phase Jitter (Random)
12kHz to 20MHz = 0.64ps (typical)
Noise Power dBc
Hz
Raw Phase Noise Data
Phase Noise Result by adding
a filter to raw data
Offset Frequency (Hz)
➝
ICS843071AGI REVISION B OCTOBER 13, 2010
5
©2010 Integrated Device Technology, Inc.
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