FemtoClock
®
NG Crystal-to-3.3V LVPECL
Clock Generator
G
ENERAL
D
ESCRIPTION
The 843001 is a Fibre Channel Clock Generator and a member
of the family of high performance devices from IDT. The 843001
uses either a 26.5625MHz or a 23.4375 crystal to synthesize
106.25MHz, 187.5MHz or 212.5MHz, using the FREQ_SEL pin.
The 843001 has excellent <1ps phase jitter performance, over the
637kHz – 10MHz integration range. The 843001 is packaged in a
small 8-pin TSSOP, making it ideal for use in systems with limited
board space.
843001
DATA SHEET
F
EATURES
•
One differential 3.3V LVPECL output
•
Crystal oscillator interface designed for 23.4375MHz or
26.5625MHz, 18pF parallel resonant crystal
•
Selectable 106.25MHz, 187.5MHz or 212.5MHz
output frequency
•
VCO range: 560MHz - 680MHz
•
RMS phase jitter @ 106.255MHz, using a 26.5625MHz crystal
(637kHz - 10MHz): 0.74ps (typical)
•
RMS phase noise at 106.25MHz
Phase noise:
Offset
Noise Power
100Hz ................-95.2 dBc/Hz
1KHz ..............-118.7 dBc/Hz
10KHz ..............-129.1 dBc/Hz
100KHz ..............-129.6 dBc/Hz
•
3.3V operating supply
•
-30°C to 85°C ambient operating temperature
•
Available in lead-free (RoHS 6) package
F
UNCTION
T
ABLE
Inputs
Crystal Frequency
26.5625MHz
26.5625MHz
23.4375MHz
FREQ_SEL
0
1
1
Output Frequencies
106.25MHz (Default)
212.5MHz
187.5MHz
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
Q0
nQ0
FREQ_SEL
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
637.5MHz w/
26.5625MHz Ref.
÷3
1
nQ0
Q0
÷6
0
843001
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
M = ÷24 (fixed)
843001 REVISION B 11/16/15
1
©2015 Integrated Device Technology, Inc.
843001 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
nQ0, Q0
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 B 11/16/15
843001 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
= 3.3V±5%, T
A
= -30°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
included in I
EE
Test Conditions
Minimum
3.135
3.135
Typical
3.3
3.3
Maximum
3.465
3.465
12
93
Units
V
V
mA
mA
T
ABLE
3B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= -30°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
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
= 3.3V±5%, T
A
= -30°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
23.4375
Test Conditions
Minimum
Typical
Fundamental
26.5625
50
7
MHz
Ω
pF
Maximum
Units
REVISION B 11/16/15
3
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
843001 DATA SHEET
T
ABLE
5. AC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= -30°C
TO
85°C
Symbol
f
OUT
Parameter
Output Frequency
RMS Phase Jitter, (Random);
NOTE 1
Output Rise/Fall Time
Output Duty Cycle
Test Conditions
FREQ_SEL = 1
FREQ_SEL = 0
212.5MHz, (637KHz to 10MHz)
tjit(Ø)
t
R
/ t
F
odc
187.5MHz, (1.875MHz to 20MHz)
106.25MHz, (637KHz to 10MHz)
20% to 80%
FSEL = 0
FSEL = 1
300
48
45
Minimum
186.67
93.33
0.67
0.52
0.74
600
52
55
Typical
Maximum
226.66
113.33
Units
MHz
MHz
ps
ps
ps
ps
%
%
NOTE 1: Please refer to Phase Noise Plot.
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
4
REVISION B 11/16/15
843001 DATA SHEET
T
YPICAL
P
HASE
N
OISE AT
106.25MH
Z
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
1k
➤
Fibre Channel Filter
106.25MHz
RMS Phase Jitter (Random)
637Khz to 10MHz = 0.74ps (typical)
0
N
OISE
P
OWER
dBc
Hz
Raw Phase Noise Data
➤
10k
T
YPICAL
P
HASE
N
OISE AT
212.5MH
Z
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
➤
Phase Noise Result by adding
Fibre Channel Filter to raw data
100k
1M
10M
100M
O
FFSET
F
REQUENCY
(H
Z
)
➤
Fibre Channel Filter
0
212.5MHz
RMS Phase Noise Jitter
637K to 10MHz = 0.67ps (typical)
N
OISE
P
OWER
dBc
Hz
Raw Phase Noise Data
➤
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
1k
➤
10k
Phase Noise Result by adding
Fibre Channel Filter to raw data
100k
1M
10M
100M
O
FFSET
F
REQUENCY
(H
Z
)
REVISION B 11/16/15
5
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
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