Programmable FemtoClock
®
NG LVPECL
Oscillator Replacement
ICS83PN625I
DATA SHEET
General Description
The ICS83PN625I is a programmable LVPECL synthesizer that is
“forward” footprint compatible with standard 5mm x 7mm oscillators.
The device uses IDT’s fourth generation FemtoClock
®
NG
technology for an optimum of high clock frequency and low phase
noise performance. Forward footprint compatibility means that a
board designed to accommodate the crystal oscillator interface and
the optional control pins is also fully compatible with a canned
oscillator footprint - the canned oscillator will drop onto the
10-VFQFN footprint for second sourcing purposes. This capability
provides designers with programability and lead time advantages of
silicon/crystal based solutions while maintaining compatibility with
industry standard 5mm x 7mm oscillator footprints for ease of supply
chain management. Oscillator-level performance is maintained with
IDT’s 4
th
Generation FemtoClock
®
NG PLL technology, which
delivers sub 0.5ps rms phase jitter.
The ICS83PN625I defaults to 312.5MHz using a 25MHz crystal with
2 programming pins floating (pulled down/pulled up with internal
pullup or pulldown resistors) but can also be set to 4 different
frequency multiplier settings to support a wide variety of
applications. The below table shows some of the more common
application settings.
Features
•
•
•
•
•
•
•
•
•
•
•
•
Fourth Generation FemtoClock
®
Next Generation (NG)
technology
Footprint compatible with 5mm x 7mm differential oscillators
One differential LVPECL output pair
Crystal oscillator interface which can be overdriven by a
single-ended reference clock
Output frequency range: 125MHz – 625MHz
Crystal/input frequency range: 25MHz, parallel resonant crystal
VCO range: 2GHz – 2.5GHz
Cycle-to-cycle jitter: 10ps (maximum), @ 3.3V±5%
RMS phase jitter @ 156.25MHz, 12kHz – 20MHz:
0.348ps (typical)
Full 3.3V or 2.5V operating supply
-40°C to 85°C ambient operating temperature
Available in a lead-free (RoHS 6) package
Frequency Select Table
FSEL[1:0]
00
01
10
11 (default)
XTAL (MHz)
25
25
25
25
Output Frequency (MHz)
156.25
625
250
312.5
Common Application(s)
10 Gigabit Ethernet XAUI
10 Gigabit Ethernet, XAUI
Ethernet, Infiniband
10 Gigabit Ethernet XAUI,
Rocket IO
Pin Assignment
FSEL1
OE
1
10
FSEL0
9
8
V
CC
Block Diagram
OE
XTAL_IN
OSC
XTAL_OUT
Pullup
Reserved
2
7
nQ
XTAL_OUT
÷M
Pullup
Pullup
ICS83PN625I
FSEL0
FSEL1
Control
Logic
10-Lead VFQFN
5mm x 7mm x 1mm package body
K Package
Top View
ICS83PN625DKI REVISION A JUNE 2, 2011
1
©2011 Integrated Device Technology, Inc.
XTAL_IN
PFD
&
LPF
FemtoClock® NG
VCO
2 - 2.5GHz
÷N
Q
nQ
V
EE
3
4
5
6
Q
ICS83PN625I Data Sheet
PROGRAMMABLE FEMTOCLOCK
®
NG LVPECL OSCILLATOR REPLACEMENT
Table 1. Pin Descriptions
Number
1
2
3
4,
5
6, 7
8
9
10
Name
OE
Reserved
V
EE
XTAL_OUT
XTAL_IN
Q, nQ
V
CC
FSEL0
FSEL1
Reserve
Power
Input
Output
Power
Input
Input
Pullup
Pullup
Type
Pullup
Description
Output enable. External pullup required for normal operation.
LVCMOS/LVTTL interface levels.
Reserved pin. Do not connect
Negative supply pin.
Crystal oscillator interface XTAL_IN is the input, XTAL_OUT is the output. This
oscillator interface can also be driven by a single-ended reference clock.
Differential output pair. LVPECL interface levels.
Power supply pin.
Output frequency select pin. Sets the output divider value to one of four values.
LVCMOS/LVTTL interface levels. See
Frequency Select Table
on page 1.
Output frequency select pin. Sets the output divider value to one of four values.
LVCMOS/LVTTL interface levels. See
Frequency Select Table
on page 1.
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
Function Table
Table 3. Divider Function Table
FSEL[1:0]
00
01
10
1 1 (default)
M Value
100
100
80
100
N Value
÷16
÷4
÷8
÷8
ICS83PN625DKI REVISION A JUNE 2, 2011
2
©2011 Integrated Device Technology, Inc.
ICS83PN625I Data Sheet
PROGRAMMABLE FEMTOCLOCK
®
NG LVPECL OSCILLATOR REPLACEMENT
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
XTAL_IN
Other Inputs
Outputs, I
O
Continuous Current
Surge Current
Package Thermal Impedance,
θ
JA
Storage Temperature, T
STG
Rating
3.63V
0V to 2V
-0.5V to V
CC
+ 0.5V
50mA
100mA
39.2°C/W (0 mps)
-65°C to 150°C
DC Electrical Characteristics
Table 4A. Power Supply DC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
CC
I
EE
Parameter
Power Supply Voltage
Power Supply Current
Test Conditions
Minimum
3.135
Typical
3.3
Maximum
3.465
131
Units
V
mA
Table 4B. Power Supply DC Characteristics,
V
CC
= 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
CC
I
EE
Parameter
Power Supply Voltage
Power Supply Current
Test Conditions
Minimum
2.375
Typical
2.5
Maximum
2.625
124
Units
V
mA
Table 4C. LVCMOS/LVTTL DC Characteristics,
V
CC
= 3.3V ± 5% or 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
IH
Parameter
Input High Voltage
Test Conditions
V
CC
= 3.465V
V
CC
= 2.625V
Input Low Voltage
Input
High Current
Input
Low Current
V
CC
= 3.465V
V
CC
= 2.625V
FSEL[1:0]
FSEL[1:0]
V
CC
= V
IN
= 3.465V or 2.625V
V
CC
= 3.465V or 2.625V, V
IN
= 0V
-150
Minimum
2
1.7
-0.3
-0.3
Typical
Maximum
V
CC
+ 0.3
V
CC
+ 0.3
0.8
0.7
5
Units
V
V
V
V
µA
µA
V
IL
I
IH
I
IL
ICS83PN625DKI REVISION A JUNE 2, 2011
3
©2011 Integrated Device Technology, Inc.
ICS83PN625I Data Sheet
PROGRAMMABLE FEMTOCLOCK
®
NG LVPECL OSCILLATOR REPLACEMENT
Table 4D. LVPECL DC Characteristics,
V
CC
= 3.3V ± 5% or 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
– 1.3
V
CC
– 2.0
0.6
Typical
Maximum
V
CC
– 0.8
V
CC
– 1.6
1.0
Units
V
V
V
NOTE 1: Outputs termination with 50Ω to V
CC
– 2V.
Table 5. Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
20
Test Conditions
Minimum
Typical
Fundamental
25
50
7
MHz
Maximum
Units
Ω
pF
ICS83PN625DKI REVISION A JUNE 2, 2011
4
©2011 Integrated Device Technology, Inc.
ICS83PN625I Data Sheet
PROGRAMMABLE FEMTOCLOCK
®
NG LVPECL OSCILLATOR REPLACEMENT
AC Electrical Characteristics
Table 6A. AC Characteristics,
V
cc
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
f
MAX
Parameter
Output Frequency
Cycle-to-Cycle Jitter; NOTE 1
156.25MHz,
Integration Range: 12kHz – 20MHz
RMS Phase Jitter (Random);
NOTE 2
250MHz,
Integration Range: 12kHz – 20MHz
312.5MHz,
Integration Range: 12kHz – 20MHz
625MHz,
Integration Range: 12kHz – 20MHz
t
R
/ t
F
odc
Output Rise/Fall Time
Output Duty Cycle
20% to 80%
100
47
0.348
0.305
0.338
0.343
Test Conditions
Minimum
156.25
Typical
Maximum
625
10
0.5
0.5
0.5
0.5
350
53
Units
MHz
ps
ps
ps
ps
ps
ps
%
tjit(cc)
tjit(Ø)
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: Characterized using a 25MHz, 12pF resonant crystal.
NOTE: Characterized using a crystal.
NOTE 1: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 2: Please refer to the Phase Noise plots.
Table 6B. AC Characteristics,
V
cc
= 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
f
MAX
Parameter
Output Frequency
Cycle-to-Cycle Jitter; NOTE 1
156.25MHz,
Integration Range: 12kHz – 20MHz
RMS Phase Jitter (Random);
NOTE 2
250MHz,
Integration Range: 12kHz – 20MHz
312.5MHz,
Integration Range: 12kHz – 20MHz
625MHz,
Integration Range: 12kHz – 20MHz
t
R
/ t
F
odc
Output Rise/Fall Time
Output Duty Cycle
20% to 80%
100
46
0.359
0.315
0.349
0.351
Test Conditions
Minimum
156.25
Typical
Maximum
625
12
0.5
0.5
0.5
0.5
350
54
Units
MHz
ps
ps
ps
ps
ps
ps
%
tjit(cc)
tjit(Ø)
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: Characterized using a 25MHz, 12pF resonant crystal.
NOTE: Characterized using a crystal.
NOTE 1: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 2: Please refer to the Phase Noise plots.
ICS83PN625DKI REVISION A JUNE 2, 2011
5
©2011 Integrated Device Technology, Inc.
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