Model 645H
Features
Very Low Jitter HCSL Clock
High Speed Current Steering Logic [HCSL] Output
Ceramic Surface Mount Package
Low Phase Jitter Performance, 500fs Typical
Fundamental or 3
rd
Overtone Crystal Design
Frequency Range 13.5MHz – 160MHz *
+2.5V or +3.3V Operation
Output Enable Standard
Tape and Reel Packaging, EIA-418
PCI Express [PCIe]
Data Storage Systems
Ethernet Line Cards
Serial ATA Express [SATAe]
Intel Chipsets
Network Servers
Switches and Routers
Set-Top Boxes/DVRs
Part Dimensions:
5.0 × 3.2 × 1.4mm
•
58.1mg
Applications
Standard Frequencies
- 25MHz
- 100MHz
- 27MHz
- 106.25MHz
- 50MHz
- 125MHz
- 155.52MHz
- 156.25MHz
* Check with factory for availability of frequencies not listed.
Description
CTS Model 645H is a low cost, high performance clock oscillator supporting HCSL output. Employing the latest IC
technology, M645H has excellent stability and low phase jitter performance.
Ordering Information
Model
645
Output
Type
H
Frequency Code
[MHz]
XXX or XXXX
Frequency
Stability
3
Temperature
Range
I
Supply
Voltage
3
Packaging
T
Code
H
Output
HCSL - Pin 1 Enable
Code
5
4
3
2
Stability
±25ppm
±30ppm
±50ppm
±100ppm
Code
2
3
Voltage
+2.5Vdc
+3.3Vdc
Code
Frequency
Product Frequency Code
1
Code Temp. Range
-20°C to +70°C
C
-40°C to +85°C
I
G -40°C to +105°C
2
Packing
Code
1k pcs./reel
T
Notes:
1] Refer to document 016-1454-0, Frequency Code Tables. 3-digits for frequencies <100MHz, 4-digits for frequencies 100MHz or greater.
2] Check factory for availability. Stability codes 2 and 3 only.
Not all performance combinations and frequencies may be available.
Contact your local CTS Representative or CTS Customer Service for availability.
This product is specified for use only in standard commercial applications. Supplier disclaims all express and implied warranties and liability in connection with any use of this
product in any non-commercial applications or in any application that may expose the product to conditions that are outside of the tolerances provided in its specification.
DOC# 008-0582-1 Rev. C
Page 1 of 7
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Very Low Jitter HCSL Clock
Model 645H
Electrical Specifications
Operating Conditions
P ARAMETER
Maximum Supply Voltage
Supply Voltage
Supply Current
SYMBO L
V
CC
V
CC
I
CC
CO NDITIO NS
-
±5%
Maximum Load
Maximum Current Value @ +3.3V
-
-
MIN
-0.3
2.375
3.135
-
-20
O perating Temperature
Storage Temperature
T
A
T
STG
-40
-40
-50
-
+25
TYP
-
2.5
3.3
-
MAX
4.0
2.625
3.465
60
+70
+85
+105
+125
°C
°C
mA
UNIT
V
V
Frequency Stability
P ARAMETER
Frequenc y Range
Frequenc y Stability
[Note 1]
SYMBO L
f
O
Δf/f
O
Δf/f
25
CO NDITIO NS
-
-
First Year @ +25°C, nominal V
CC
MIN
TYP
13.5 - 160
25, 30, 50 or 100
MAX
UNIT
MHz
±ppm
Aging
-5
±3
5
ppm
1.] Inclusive of initial tolerance at time of shipment, changes in supply voltage, load, temperature and 1st year aging.
Output Parameters
P ARAMETER
O utput Type
O utput Load
O utput Voltage Levels
O utput Duty Cyc le
Differential O utput Voltage
Rise and Fall Time
SYMBO L
-
R
L
V
OH
V
OL
SYM
V
OD
T
R
, T
F
CO NDITIO NS
-
Terminated to ground
HCSL Load
Differential Output, @ V
CC
- 1.3V
R
L
= 50 Ohms to ground
@ 20%/80% Levels, R
L
= 50 Ohms to ground
-
-580
-150
45
0.4
-
MIN
TYP
HCSL
50
-
-
-
-
0.50
-
850
150
55
-
0.70
MAX
UNIT
-
Ohms
mV
%
Vp-p
ns
Output Parameters
P ARAMETER
Start Up Time
Enable Func tion [Standby]
Enable Input Voltage
Disable Input Voltage
Disable Current
Enable Time
P hase Jitter, RMS
V
IH
V
IL
I
IL
T
PLZ
tjrms
Pin 1 Logic '1', Output Enabled
Pin 1 Logic '0', Output Disabled
Pin 1 Logic '0', Output Disabled
Pin 1 Logic '1', Output Enabled
Bandwidth 12 kHz - 20 MHz
0.7V
CC
-
-
-
-
-
-
15
-
500
-
0.3V
CC
-
2
-
V
V
µA
ms
fs
SYMBO L
T
S
CO NDITIO NS
Application of V
CC
MIN
-
TYP
5
MAX
10
UNIT
ms
DOC# 008-0582-1 Rev. C
Page 2 of 7
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Very Low Jitter HCSL Clock
Model 645H
Electrical Specifications
Enable Truth Table
Pin 1
Logic ‘1’
Open
Logic ‘0’
Pin 4 & Pin 5
Output
Output
High Imp.
Test Circuit
HCSL
Output Waveform
HCSL
DOC# 008-0582-1 Rev. C
Page 3 of 7
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Very Low Jitter HCSL Clock
Model 645H
Electrical Specifications
Performance Data
Phase Noise [typical]
100.00MHz, HCSL, V
CC
= 3.3V, T
A
= +25°C
DOC# 008-0582-1 Rev. C
Page 4 of 7
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Very Low Jitter HCSL Clock
Model 645H
Electrical Specifications
Performance Data
Phase Noise Tabulated
Typical, 100.00MHz, HCSL, V
CC
= 3.3V, T
A
= +25°C
P ARAMETER
HCSL @ 1 0 0 .0 0 MHz
P hase Noise
Single Side Band
@ 10Hz
@ 100Hz
-
@ 1kHz
@ 10kHz
@ 100kHz
@ 1MHz
@ 10MHz
P hase Jitter, RMS
tjrms
-75.9328
-106.9929
-135.1951
-144.2209
-152.8159
-153.5793
-154.8219
fs
dBc/Hz
SYMBO L
CO NDITIO NS
TYP
UNIT
Integration Bandwidth 12kHz - 20MHz 188.2315
DOC# 008-0582-1 Rev. C
Page 5 of 7
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
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