FEMTOCLOCKS™ CRYSTAL-TO-2.5V LVPECL
FREQUENCY SYNTHESIZER
ICS843001-40
G
ENERAL
D
ESCRIPTION
The ICS843001-40 is an LVPECL output Synthesizer
and is a member of the HiPerClocks
TM
family of high
HiPerClockS™
performance devices from IDT. The device uses a
40MHz crystal to provide a 40MHz reference clock
output and to synthesize a 50MHz, 100MHz, or
106.25MHz output. The ICS843001-40 has excellent <1ps phase
jitter performance over the 637kHz – 5MHz integration range.
The ICS843001-40 is packaged in a 3mm x 3mm 16-pin VFQFN,
making it ideal for use on space constrained boards.
F
EATURES
•
One differential 2.5V LVPECL output
One reference clock output, 30Ω typical output impedance
•
40MHz, 10pF parallel resonant crystal
•
Output frequencies: 50MHz, 100MHz, or 106.25MHz
•
RMS phase jitter @ 106.25MHz, using a 40MHz crystal
(637kHz –5MHz): 0.35ps (typical)
•
2.5V operating supply
•
0°C to 70°C ambient operating temperature
•
Availabe in lead-free (RoHS 6) package
IC
S
F
UNCTION
T
ABLE
Inputs
Crystal Frequency
(MHz)
40
40
40
40
Outputs
Q/nQ Outputs
REF_OUT
Frequency (MHz)
Frequency (MHz)
40
50
100
106.25
106.25
40
40
40
SEL[1:0]
00
01
10
11
Application
SAS (default)
SAS
Fiber Channel
Fiber Channel
B
LOCK
D
IAGRAM
REF_OUT
P
IN
A
SSIGNMENT
V
CCA
nc
nc
SEL1 1
XTAL_OUT 2
16 15 14 13
12
11
10
9
5
V
EE
Q
nQ
V
CCO
_
LVPECL
V
CC
REF_OUT
XTAL_IN
OSC
XTAL_OUT
SEL[1:0]
Pulldown
2
Synthesizer
Q
nQ
XTAL_IN 3
SEL0 4
6
nc
7
V
CCO
_
REF
_
OUT
8
V
EE
ICS843001-40
16-Lead VFQFN
3mm x 3mm x 0.925 package body
K Package
Top View
IDT
™
/ ICS
™
2.5V LVPECL FREQUENCY SYNTHESIZER
1
ICS843001AK-40 REV. A OCTOBER 10, 2007
ICS843001-40
FEMTOCLOCKS™ CRYSTAL-TO-2.5V LVPECL FREQUENCY SYNTHESIZER
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1, 4
2, 3
5, 8
6, 14, 15
7
9
10
11
12, 13
16
Name
SEL1, SEL0
XTAL_OUT,
XTAL_IN
V
EE
nc
V
CCO_REF_OUT
REF_OUT
V
CC
V
CCO_LVPECL
nQ, Q
V
CCA
Input
Input
Power
Unused
Power
Output
Power
Power
Output
Power
Type
Description
Pulldown Output frequency select pins. LVCMOS/LVTTL interface levels.
Crystal oscillator interface. XTAL_IN is the input.
XTAL_OUT is the output.
Negative supply pins.
No connect.
Output supply pin for REF_OUT output.
Single-ended three-state reference clock output.
LVCMOS/LVTTL interface levels. 30
Ω
typical output impedance.
Core supply pin.
Output supply pin for Q/nQ outputs.
Differential output pair. LVPECL interface levels.
Analog 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
R
OUT
Parameter
Input Capacitance
Input Pulldown Resistor
Output
REF_OUT
Impedance
Test Conditions
Minimum
Typical
4
51
30
Maximum
Units
pF
kΩ
Ω
IDT
™
/ ICS
™
2.5V LVPECL FREQUENCY SYNTHESIZER
2
ICS843001AK-40 REV. A OCTOBER 10, 2007
ICS843001-40
FEMTOCLOCKS™ CRYSTAL-TO-2.5V LVPECL FREQUENCY SYNTHESIZER
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
(LVPECL)
Continuous Current
Surge Current
Outputs, V
O
(LVCMOS)
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
-0.5V to V
CCO_REF_OUT
+ 0.5V
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent 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.
Package Thermal Impedance,
θ
JA
74.9°C/W (0 mps)
Storage Temperature, T
STG
-65°C to 150°C
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= V
CCO_REF_OUT
= V
CCO_LVPECL
= 2.5V±5%, V = 0V, T
A
= 0°C
TO
70°C
EE
Symbol
V
CC
V
CCA
V
CCO_LVPECL,
V
CCO_REF_OUT
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Output Supply Voltage
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
2.375
V
CC
– 0.08
2.375
Typical
2.5
2.5
2.5
Maximum
2.625
V
CC
2.625
8
80
Units
V
V
V
mA
mA
T
ABLE
3B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
CC
= V
CCO_REF_OUT
= 2.5V±5%, V = 0V, T
A
= 0°C
TO
70°C
EE
Symbol
V
IH
V
IL
I
IH
I
IL
V
OH
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Output High Voltage; NOTE 1
Test Conditions
Minimum
2
-0.3
Typical
Maximum
V
CC
+ 0.3
0.8
150
Units
V
V
µA
µA
V
V
CC
= V
IN
= 2.625V
V
CC
= 2.625V, V
IN
= 0V
I
OH
= 1mA
-5
2.2
Output Low Voltage; NOTE 1
I
OL
= -1mA
V
OL
NOTE 1: Outputs terminated with 50
Ω
to V
CCO_REF_OUT
/2 See Parameter Measurement Information Section,
"2.5V Output Load Test Circuit" diagram.
0.4
V
T
ABLE
3C. LVPECL DC C
HARACTERISTICS
,
V
CC
= V
CCO_LVPECL
= 2.5V±5%, V = 0V, T
A
= 0°C
TO
70°C
EE
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
CCO_LVPECL
- 1.4
V
CCO_LVPECL
- 2.0
0. 6
Typical
Maximum
V
CCO_LVPECL
- 0.9
V
CCO_LVPECL
- 1.7
1.0
Units
V
V
V
NOTE 1: Outputs terminated with 50
Ω
to V
CCO_LVPECL
- 2V.
IDT
™
/ ICS
™
2.5V LVPECL FREQUENCY SYNTHESIZER
3
ICS843001AK-40 REV. A OCTOBER 10, 2007
ICS843001-40
FEMTOCLOCKS™ CRYSTAL-TO-2.5V LVPECL FREQUENCY SYNTHESIZER
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Test Conditions
Minimum
Typical
Fundamental
40
50
7
MHz
Ω
pF
Maximum
Units
T
ABLE
5. AC C
HARACTERISTICS
,
V
CC
= V
CCO_REF_OUT
= V
CCO_LVPECL
= 2.5V±5%, V = 0V, T
A
= 0°C
TO
70°C
EE
Symbol Parameter
REF_OUT
f
OUT
Output Frequency
Q/nQ
Q/nQ
Q/nQ
Test Conditions
SEL_OUT = 00
SEL_OUT = 01
SEL_OUT = 10 or 11
50MHz, Integration Range:
637kHz – 5MHz
100MHz, Integration Range:
637kHz – 5MHz
106.25MHz, Integration Range:
637kHz – 5MHz
40MHz
20% to 80%
Minimum
Typical
40
50
100
106.25
0.53
0.46
0.35
Maximum
Units
MHz
MHz
MHz
MHz
ps
ps
ps
t
jit(Ø)
RMS Phase Jitter (Random)
t
jit(cc)
t
R
/ t
F
Cycle-to-Cycle
Jitter ; NOTE 1
Output
Rise/Fall Time
REF_OUT
Q/nQ
REF_OUT
125
110
0.7
150
45
48
2.1
650
55
52
ps
ps
ns
ps
%
%
Q/nQ
20% to 80%
REF_OUT
Output Duty
odc
Cycle
Q/nQ
NOTE 1: This parameter is defined in accordance with JEDEC Standard 65.
IDT
™
/ ICS
™
2.5V LVPECL FREQUENCY SYNTHESIZER
4
ICS843001AK-40 REV. A OCTOBER 10, 2007
ICS843001-40
FEMTOCLOCKS™ CRYSTAL-TO-2.5V LVPECL FREQUENCY SYNTHESIZER
T
YPICAL
P
HASE
N
OISE AT
106.25MH
Z
106.25MHz
RMS Phase Jitter (Random)
637kHz to 5MHz = 0.35ps (typical)
N
OISE
P
OWER
dBc
Hz
Raw Phase Noise Data
➤
Phase Noise Result by adding
Fibre Channel Filter to raw data
O
FFSET
F
REQUENCY
(H
Z
)
T
YPICAL
P
HASE
N
OISE AT
100MH
Z
RMS Phase Jitter (Random)
637kHz to 5MHz = 0.46ps (typical)
➤
Fibre Channel Filter
100MHz
N
OISE
P
OWER
dBc
Hz
Raw Phase Noise Data
➤
Phase Noise Result by adding
Fibre Channel Filter to raw data
O
FFSET
F
REQUENCY
(H
Z
)
IDT
™
/ ICS
™
2.5V LVPECL FREQUENCY SYNTHESIZER
5
ICS843001AK-40 REV. A OCTOBER 10, 2007
➤
Fibre Channel Filter
➤
➤
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