FemtoClock
®
Crystal-to-3.3V LVPECL
Clock Generator
G
ENERAL
D
ESCRIPTION
The ICS843011C is a Fibre Channel Clock Generator. The
ICS843011C uses a 26.5625MHz crystal to synthesize
106.25MHz or a 25MHz crystal to synthesize 100MHz. The
ICS843011C has excellent <1ps phase jitter performance, over
the 637kHz – 10MHz integration range. The ICS843011C is
packaged in a small 8-pin TSSOP, making it ideal for use in
systems with limited board space.
ICS843011C
DATA SHEET
F
EATURES
•
One differential 3.3V LVPECL output
•
Crystal oscillator interface designed for 26.5625MHz,
18pF parallel resonant crystal
•
Output frequency: 106.25MHz or 100MHz
•
VCO range: 560MHz - 680MHz
•
RMS phase jitter @ 100MHz, using a 25MHz crystal
(637kHz - 10MHz): 0.29ps (typical)
•
3.3V operating supply
•
0°C to 70°C ambient operating temperature
•
Available in lead-free (RoHS 6) packaging
F
REQUENCY
T
ABLE
Crystal (MHz)
26.5625
25
Output Frequency (MHz)
106.25
100
B
LOCK
D
IAGRAM
XTAL_IN
P
IN
A
SSIGNMENT
VCO
637.5MHz w/
26.5625MHz Ref.
OSC
XTAL_OUT
Phase
Detector
÷6
Q
nQ
V
CCA
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q
nQ
nc
ICS843011C
M = ÷24 (fixed)
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
ICS843011CG REVISION A MARCH 12, 2014
1
©2014
Integrated Device Technology, Inc.
ICS843011C Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V 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
nc
nQ, Q
V
CC
Power
Power
Input
Unused
Output
Power
Type
Description
Analog supply pin.
Negative supply pin.
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
No connect.
Differential clock outputs. LVPECL interface levels.
Core supply pin.
ICS843011CG REVISION A MARCH 12, 2014
2
©2014
Integrated Device Technology, Inc.
ICS843011C Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
Package Thermal Impedance,
θ
JA
Storage Temperature, T
STG
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
101.7°C/W (0 mps)
-65°C to 150°C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanen t damage to the
device. These ratings are stress specifications only. Functional op-
eration 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 ex-
tended periods may affect product reliability.
T
ABLE
2A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= 0°C
TO
70°C
Symbol
V
CC
V
CCA
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Analog Supply Current
Power Supply Current
included in I
EE
Test Conditions
Minimum
3.135
V
CC
– 0.12
Typical
3.3
3.3
Maximum
3.465
V
CC
12
90
Units
V
V
mA
mA
T
ABLE
2B. LVPECL DC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= 0°C
TO
70°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 50Ω to V
CC
- 2V.
T
ABLE
3. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Drive Level
25
Test Conditions
Minimum
Typical
Fundamental
26.5625
50
7
1
MHz
Ω
pF
mW
Maximum
Units
T
ABLE
4. AC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= 0°C
TO
70°C
Symbol Parameter
F
OUT
Output Frequency
Test Conditions
25MHz
26.5625MHz
106.25MHz;
Integration Range: 637kHz - 10MHz
100MHz;
Integration Range: 637kHz - 10MHz
20% to 80%
Minimum
Typical
100
106.25
0.29
0.29
250
49
500
51
Maximum
Units
MHz
MHz
ps
ps
ps
%
tjit(Ø)
t
R
/ t
F
odc
RMS Phase Jitter (Random);
NOTE 1
Output Rise/Fall Time
Output Duty Cycle
NOTE 1: Please refer to the Phase Noise Plots.
ICS843011CG REVISION A MARCH 12, 2014
3
©2014
Integrated Device Technology, Inc.
ICS843011C Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
T
YPICAL
P
HASE
N
OISE AT
106.25MH
Z
-10
-20
-30
-40
-50
-60
➤
Fibre Channel Filter
106.25MHz
RMS Phase Noise Jitter
637kHz to 10MHz = 0.29ps (typical)
0
N
OISE
P
OWER
dBc
Hz
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
1k
10k
Raw Phase Noise Data
➤
Phase Noise Result by adding
a Fibre Channel Filter to raw data
100k
1M
10M
100M
➤
O
FFSET
F
REQUENCY
(H
Z
)
4
©2014
Integrated Device Technology, Inc.
ICS843011CG REVISION A MARCH 12, 2014
ICS843011C Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
P
ARAMETER
M
EASUREMENT
I
NFORMATION
2V
2V
V
CC
V
CCA
-1.3V ± 0.165V
3.3V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
RMS P
HASE
J
ITTER
nQ
Q
nQ
Q
O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
O
UTPUT
R
ISE
/F
ALL
T
IME
ICS843011CG REVISION A MARCH 12, 2014
5
©2014
Integrated Device Technology, Inc.
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