FemtoClock
®
Crystal-to-2.5V, 3.3V LVPECL
Clock Multiplier
PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES NOVEMBER 2, 2016
843081I-01
DATA SHEET
G
ENERAL
D
ESCRIPTION
The 843081I-01 is an Ethernet Clock Multiplier. The 843081I-01
accepts a crystal reference of 19.6MHz - 28MHz. The 843081I-
01 has excellent 1ps or lower phase jitter performance, over
the 1.875MHz - 20MHz integration range. The 843081I-01 is
packaged in a small 8-pin TSSOP, making it ideal for use in
systems with limited board space.
F
EATURES
•
One differential LVPECL output
•
One crystal oscillator interface: 19.6MHz - 28MHz
•
Output frequency range: 490MHz - 700MHz
•
VCO range: 490MHz - 700MHz
•
RMS phase jitter @ 625MHz using a 25MHz reference
(1.875MHz - 20MHz): 0.32ps (typical)
•
3.3V or 2.5V operating supply
•
-40°C to 85°C ambient operating temperature
•
Available in lead-free RoHS compliant package
•
For functional replacement part use 843071
F
REQUENCY
E
XAMPLE
F
UNCTION
T
ABLE
Input
XTAL (MHz)
20
25
28
M/N (Multiplier)
25
25
25
Output Frequencies (MHz)
500
625
700
B
LOCK
D
IAGRAM
OE
P
IN
A
SSIGNMENT
V
CCA
XTAL_OUT
XTAL_IN
V
EE
Q
1
2
3
4
8
7
6
5
V
CC
Q
nQ
OE
XTAL_IN
Phase
Detector
XTAL_OUT
VCO
490 - 700 MHz
nQ
843081I-01
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
M = ÷25 (fixed)
843081I-01 REVISION C 11/5/15
1
©2015 Integrated Device Technology, Inc.
843081I-01 DATA SHEET
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2,
3
4
5
6, 7
8
Name
V
CCA
XTAL_OUT,
XTAL_IN
V
EE
OE
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.
Output enable pin. When HIGH, Q output is enabled.
When LOW, forces Q to HiZ state. LVCMOS/LVTTL interface levels.
Differential clock outputs. LVPECL interface levels.
Core supply pin.
NOTE:
Pullup
refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
PULLUP
Parameter
Input Capacitance
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
FEMTOCLOCKS
®
CRYSTAL-TO-
3.3V, 2.5V LVPECL CLOCK MULTIPLIER
2
REVISION C 11/5/15
843081I-01 DATA SHEET
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 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 Charac-
teristics
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
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
CC
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Power Supply Current
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
3.135
3.135
Typical
3.3
3.3
72
12
78
Maximum
3.465
3.465
Units
V
V
mA
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
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
60
12
73
Maximum
2.625
2.625
Units
V
V
mA
mA
mA
T
ABLE
3C. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 3.3V ± 5%
OR
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
Test Conditions
V
CC
= 3.3V
V
CC
= 2.5V
V
CC
= 3.3V
V
CC
= 2.5V
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
REVISION C 11/5/15
3
FEMTOCLOCKS
®
CRYSTAL-TO-
3.3V, 2.5V LVPECL CLOCK MULTIPLIER
843081I-01 DATA SHEET
T
ABLE
3D. 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 50Ω to V
CC
- 2V.
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Drive Level
19.6
Test Conditions
Minimum
Typical
Fundamental
28
50
7
1
MHz
Ω
pF
mW
Maximum
Units
T
ABLE
5A. AC C
HARACTERISTICS
,
V
CC
= V
CCA
= 3.3V ± 5%, T
A
= -40°C
TO
85°C
Symbol
f
OUT
tjit(Ø)
t
R
/ t
F
odc
Parameter
Output Frequency
RMS Phase Jitter (Random);
NOTE 1
Output Rise/Fall Time
Output Duty Cycle
625MHz @ Integration Range:
1.875MHz - 20MHz
20% to 80%
XTAL = 25MHz
125
45
Test Conditions
Minimum
490
0.32
600
55
Typical
Maximum
700
Units
MHz
ps
ps
%
NOTE 1: Please refer to the Phase Noise Plot following this section.
T
ABLE
5B. AC C
HARACTERISTICS
,
V
CC
= V
CCA
= 2.5V ± 5%, T
A
= -40°C
TO
85°C
Symbol
f
OUT
tjit(Ø)
t
R
/ t
F
odc
Parameter
Output Frequency
RMS Phase Jitter (Random);
NOTE 1
Output Rise/Fall Time
Output Duty Cycle
625MHz @ Integration Range:
1.875MHz - 20MHz
20% to 80%
XTAL = 25MHz
125
45
Test Conditions
Minimum
490
0.39
650
55
Typical
Maximum
700
Units
MHz
ps
ps
%
NOTE 1: Please refer to the Phase Noise Plot following this section.
FEMTOCLOCKS
®
CRYSTAL-TO-
3.3V, 2.5V LVPECL CLOCK MULTIPLIER
4
REVISION C 11/5/15
843081I-01 DATA SHEET
-10
-20
-30
-40
-50
-60
➤
Gb Ethernet Filter
625MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.32ps (typical)
0
T
YPICAL
P
HASE
N
OISE AT
625MH
Z
@ 3.3V
N
OISE
P
OWER
dBc
Hz
-70
-80
Raw Phase Noise Data
➤
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
200
10
100
➤
1k
Phase Noise Result by adding
a Gb Ethernet Filter to raw data
10k
100k
1M
10M
100M
O
FFSET
F
REQUENCY
(H
Z
)
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
200
10
100
1k
10k
100k
➤
Gb Ethernet Filter
625MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.39ps (typical)
0
T
YPICAL
P
HASE
N
OISE AT
625MH
Z
@ 2.5V
N
OISE
P
OWER
dBc
Hz
Raw Phase Noise Data
➤
Phase Noise Result by adding
a Gb Ethernet Filter to raw data
1M
10M
100M
➤
O
FFSET
F
REQUENCY
(H
Z
)
REVISION C 11/5/15
5
FEMTOCLOCKS
®
CRYSTAL-TO-
3.3V, 2.5V LVPECL CLOCK MULTIPLIER
单片机
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