FEMTOCLOCKS™ CRYSTAL-TO-
3.3V, 2.5V LVPECL CLOCK GENERATOR
ICS843022I-48
G
ENERAL
D
ESCRIPTION
The ICS843022I-48 is a Fibre Channel Clock Generator. The
ICS843022I-48 uses a 25MHz crystal to synthesize 125MHz or
75MHz. The ICS843022I-48 has excellent phase jitter perform-
ance, over the 12kHz – 20MHz integration range. The
ICS843022I-48 is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
F
EATURES
•
One differential 3.3V or 2.5V LVPECL output
•
Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
•
Output frequencies: 125MHz or 75MHz (selectable)
•
RMS phase jitter @ 125MHz, using a 25MHz crystal
(12kHz - 20MHz): 0.72ps (typical) @ 3.3V
•
Full 3.3V and 2.5V operating supply
•
-40°C to 85°C ambient operating temperature
•
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
F
UNCTION
T
ABLE
Inputs
FREQ_SEL
0
1
M Divide
÷20
÷24
N Divide
÷4
÷8
Output Frequencies
(with a 25MHz crystal)
125MHz (default)
75MHz
B
LOCK
D
IAGRAM
XTAL_IN
P
IN
A
SSIGNMENT
PLL
DIV. N
÷4, ÷8
Q
nQ
V
CCA
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q
nQ
FREQ_SEL
OSC
XTAL_OUT
0 = ÷20
(default)
1 = ÷24
FREQ_SEL
Pulldown
ICS843022I-48
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL CLOCK GENERATOR
1
ICS843022AGI-48 REV A OCTOBER 22, 2012
ICS843022I-48
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2
3, 4
5
6, 7
8
Name
V
CCA
V
EE
XTAL_OUT,
XTAL_IN
FREQ_SEL
nQ, Q
V
CC
Power
Power
Input
Input
Output
Power
Type
Description
Analog supply pin.
Negative supply pin.
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
Pulldown Frequency select pin. LVCMOS/LVTTL interface levels.
Differential clock output. LVPECL interface levels.
Core supply pin.
NOTE:
Pulldown
refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
PULLDOWN
Parameter
Input Capacitance
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL CLOCK GENERATOR
2
ICS843022AGI-48 REV A OCTOBER 22, 2012
ICS843022I-48
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
Storage Temperature, T
STG
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
-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.
Package Thermal Impedance,
θ
JA
101.7°C/W (0 mps)
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
V
CC
V
CCA
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
3.135
V
CC
– 0.10
Typical
3.3
3.3
Maximum
3.465
V
CC
10
80
Units
V
V
mA
mA
T
ABLE
3B. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
V
CC
V
CCA
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
2.375
V
CC
– 0.10
Typical
2.5
2.5
Maximum
2.625
V
CC
10
75
Units
V
V
V
mA
T
ABLE
3C. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
V
CC
= V
IN
= 3.465V
V
CC
= 3.465V, V
IN
= 0V
-5
Test Conditions
Minimum
1.3
-0.3
Typical
Maximum
V
CC
+ 0.3
0.7
150
Units
V
V
µA
µA
T
ABLE
3D. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
V
CC
= V
IN
= 2.625V
V
CC
= 2.625V, V
IN
= 0V
-5
Test Conditions
Minimum
1.1
-0.3
Typical
Maximum
V
CC
+ 0.3
0.5
150
Units
V
V
µA
µA
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL CLOCK GENERATOR
3
ICS843022AGI-48 REV A OCTOBER 22, 2012
ICS843022I-48
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
T
ABLE
3E. LVPECL DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 3.3V±5%
OR
2.5V±5%, 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 terminated with 50
Ω
to V
CC
- 2V.
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Drive Level
NOTE: It is not recommended to overdrive the crystal input with an external clock.
Test Conditions
Minimum
Typical
Fundamental
25
Maximum
Units
MHz
50
7
100
Ω
pF
µW
T
ABLE
5A. AC C
HARACTERISTICS
,
V
CC
= V
CCA
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
f
OUT
Parameter
Output Frequency
125MHz,
Integration Range: 12kHz - 20MHz
75MHz,
Integration Range: 900kHz - 7.5MHz
20% to 80%
Test Conditions
Minimum
Typical
125
75
0.72
0.51
250
48
450
52
Maximum
Units
MHz
MHz
ps
ps
ps
%
t
jit(Ø)
t
R
/ t
F
RMS Phase Jitter ; NOTE 1
Output Rise/Fall Time
odc
Output Duty Cycle
NOTE 1: Please refer to the Phase Noise Plot.
T
ABLE
5B. AC C
HARACTERISTICS
,
V
CC
= V
CCA
= 2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
f
OUT
Parameter
Output Frequency
125MHz,
Integration Range: 12kHz - 20MHz
75MHz,
Integration Range: 900kHz - 7.5MHz
20% to 80%
Test Conditions
Minimum
Typical
125
75
0.66
0.60
250
48
450
52
Maximum
Units
MHz
MHz
ps
ps
ps
%
t
jit(Ø)
t
R
/ t
F
RMS Phase Jitter; NOTE 1
Output Rise/Fall Time
odc
Output Duty Cycle
NOTE 1: Please refer to the Phase Noise Plot.
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL CLOCK GENERATOR
4
ICS843022AGI-48 REV A OCTOBER 22, 2012
ICS843022I-48
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
T
YPICAL
P
HASE
N
OISE AT
125MH
Z
@ 3.3V
ä
Fibre Channel Filter
125MHz
N
OISE
P
OWER
dBc
Hz
RMS Phase Noise Jitter
12kHz to 20MHz = 0.72ps (typical)
Raw Phase Noise Data
ä
Phase Noise Result by adding
a Fibre Channel Filter to raw data
O
FFSET
F
REQUENCY
(H
Z
)
T
YPICAL
P
HASE
N
OISE AT
75MH
Z
@ 3.3V
75MHz
RMS Phase Jitter (Random)
900kHz to 7.5MHz = 0.51ps (typical)
ä
Fibre Channel Filter
Phase Noise Result by adding
Fibre Channel Filter to raw data
5
ä
N
OISE
P
OWER
dBc
Hz
Raw Phase Noise Data
O
FFSET
F
REQUENCY
(H
Z
)
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL CLOCK GENERATOR
ä
ICS843022AGI-48 REV A OCTOBER 22, 2012
ä
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