FemtoClock
®
Crystal-to-3.3V LVPECL
Clock Generator
PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES MAY 6, 2017
843022
DATA SHEET
G
ENERAL
D
ESCRIPTION
The 843022 is a Gigabit Ethernet Clock Generator and a
member of the HiPerClocks
TM
family of high performance
devices from IDT. The 843022 uses a 25MHz crystal to
synthesize 125MHz or 62.5MHz. The 843022 has excel-
lent phase jitter performance, over the 1.875MHz – 20MHz
integration range. The 843022 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 LVPECL output
•
Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
•
Output frequencies: 125MHz or 62.5MHz (selectable)
•
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.39ps (typical)
Offset
Noise Power
100Hz ................-96.5 dBc/Hz
1kHz ..............-122.5 dBc/Hz
10kHz ..............-132.1 dBc/Hz
100kHz ..............-131.5 dBc/Hz
•
3.3V operating supply
•
0°C to 70°C ambient operating temperature
•
Industrial temperature information available upon request
•
Available in lead-free (RoHS 6) package
F
UNCTION
T
ABLE
Inputs
FREQ_SEL
0
1
Output Frequencies
(with a 25MHz crystal)
125MHz
62.5MHz
B
LOCK
D
IAGRAM
FREQ_SEL
Pulldown
P
IN
A
SSIGNMENT
V
CCA
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q
nQ
FREQ_SEL
25MHz
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
560MHz-680MHz
w/25MHz Ref.
÷5
0
Q
nQ
÷10
1
843022
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
M = ÷25 (fixed)
843022 REVISION A 11/16/15
1
©2015 Integrated Device Technology, Inc.
843022 DATA SHEET
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 outputs. 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
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
2
REVISION A 11/16/15
843022 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
N OT E : S t r e s s e s b eyo n d t h o s e l i s t e d u n d e r A b s o l u t e
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 ex-
tended periods may affect product reliability.
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 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
Test Conditions
Minimum
3.135
V
CC
– 0.1
Typical
3.3
3.3
Maximum
3.465
V
CC
10
90
Units
V
V
mA
mA
T
ABLE
3B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 3.3V±5%, T
A
=0°C
TO
70°C
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
FREQ_SEL
FREQ_SEL
V
CC
= V
IN
= 3.465V
V
CC
= 3.465V, V
IN
= 0V
-5
Test Conditions
Minimum
2
-0.3
Typical
Maximum
V
CC
+ 0.3
0.8
150
Units
V
V
µA
µA
T
ABLE
3C. LVPECL DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 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
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Drive Level
Test Conditions
Minimum
Typical
Fundamental
25
50
7
1
MHz
Ω
pF
mW
Maximum
Units
REVISION A 11/16/15
3
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATORY
843022 DATA SHEET
T
ABLE
5. AC C
HARACTERISTICS
,
V
CC
= V
CCA
= 3.3V±5%, T
A
=0°C
TO
70°C
Symbol
f
OUT
Parameter
Output Frequency
Test Conditions
F_SEL = 0
F_SEL = 1
125MHz,
Integration Range: 1.875MHz - 20MHz
62.5MHz,
Integration Range: 1.875MHz - 20MHz
20% to 80%
300
48
Minimum
Typical
125
62.5
0.39
0.39
600
52
Maximum
Units
MHz
MHz
ps
ps
ps
%
tjit(Ø)
t
R
/ t
F
odc
RMS Phase Jitter;
NOTE 1
Output Rise/Fall Time
Output Duty Cycle
NOTE 1: Please refer to the Phase Noise Plot.
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
4
REVISION A 11/16/15
843022 DATA SHEET
0
-10
-20
-30
-40
-50
T
YPICAL
P
HASE
N
OISE AT
62.5MH
Z
➤
Gigabit Ethernet Filter
62.5MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.39ps (typical)
N
OISE
P
OWER
dBc
Hz
-60
-70
-80
-90
-100
-110
-120
Raw Phase Noise Data
➤
-130
-140
-150
➤
1k
10k
100k
-160
-170
-180
-190
Phase Noise Result by adding
Gigabit Ethernet Filter to raw data
1M
10M
100M
O
FFSET
F
REQUENCY
(H
Z
)
0
-10
-20
-30
-40
-50
T
YPICAL
P
HASE
N
OISE AT
125MH
Z
➤
Gigabit Ethernet Filter
125MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.39ps (typical)
N
OISE
P
OWER
dBc
Hz
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
1k
10k
100k
1M
10M
Raw Phase Noise Data
➤
➤
Phase Noise Result by adding
Gigabit Ethernet Filter to raw data
100M
O
FFSET
F
REQUENCY
(H
Z
)
REVISION A 11/16/15
5
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATORY
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