EMI Reducing Spread Spectrum Clock Oscillators (SSXOs)
18HM Series (+1.8 V Supply Voltage)
Group “F”
Features:
◘
Reduces Electromagnetic Interference by approx. -12dB
◘
Drop-In Replacement for Conventional Oscillators
◘
No Need to Re-Spin the Board or Solder Pad Layout
◘
Operates with a +1.8V Supply Voltage
◘
RoHS Compliant & Lead - Free
◘
3.2 x 2.5, 5.0 x 3.2 or 5.0 x 7.0mm Package Sizes
◘
Save Money & Time to Market
MERCURY
Since 1973
18HM53
18HM572
18HM32
Applications:
◘
Printers; Multiple function printers (MPCs)
◘
Digital copiers; PDAs
◘
Networking; LAN / WAN; Routers
◘
Storage systems
(CD-ROM,
VCD, DVD & HDD)
◘
Scanner; Modems; Projectors
◘
Hand-held ID Readers
◘
Embedded systems;
◘
Automotive; GPS Navigation Systems
◘
LCD PC Monitors / LCD TVs
◘
ADSL; PCMCIA
◘
Still Digital Cameras (SDCs)
◘
Medical Devices
Spread Spectrum Crystal Oscillator (SSXO):
Unlike the conventional clock, the mode
energy of a spread spectrum clock is spread
(distributed) over a wider bandwidth between
two pre-defined frequency boundaries by the
frequency modulation
technique. The
modulation carrier frequency is in the KHz
range which makes the modulation process
transparent to the oscillator frequency. This
controlled modulation process can be on all
of one side of the nominal frequency (down
spread),
which is preferred if system over-
clocking is a concern, or 50% up and 50%
down (center
spread).
Modulation Types
DOWN SPREAD or CENTER SPREAD
Down spread “D”.
“D1” as an example
Center spread “C”.
“C0.5” as an example
Output amplitude (dB) vs frequency span (MHz)
dB
Conventional
Clock
dB
EMI reduction
Conventional
Clock
EMI reduction
Spread
spectrum
clock
fo - (fo*1%)
fc
Frequency
fo - (fo*0.5%)
fo=fc
fo+(fo*0.5%)
42 MHz non-SSC vs SSC at Center Spread 0.25%:
No modulation
(non-SSXO)
-9.9 dB
Center spread
0.25% (C0.25)
-22.8 dB
12.3 dB
EMI
reduction
Taiwan: TEL (886)-2-2406-2779, FAX (886)-2-2496-0769, e-mail:
sales-tw@mercury-crystal.com
U.S.A.: TEL (1)-909-466-0427, FAX (1)-909-466-0762, e-mail:
sales-us@mercury-crystal.com
MERCURY
Page 1 of 5
Oct. 11. 2012
Rev. 0
MERCURY
www.mercury-crystal.com
EMI Reducing Spread Spectrum Clock Oscillators (SSXOs)
18HM Series (+1.8 V Supply Voltage)
Group “F”
General Specifications:
at Ta=+25°C, C
L
=15 pF
Product Models / Package Sizes
Performance Characteristics
Frequency Range
18HM572:
5 x 7 x 1.4 mm
18HM53:
3.2 x 5 x 1.2 mm
18HM32:
2.5 x 3.2 x 1.0 mm
Group “F”
12.5 ~ 42.0 MHz
MERCURY
Since 1973
Spread Type / Spread Percentage
/ EMI Reduction Rate
Modulation Carrier Frequency
(Dither rate, number of clocks per
one modulation)
Output Logic
Input Voltage (V
DD
)
Frequency Stability
(exclude modulation)
Output Voltage “High”; “1”
Output Voltage “Low”; “0”
Rise Time / Fall Time
Load
Output Impedance
Output Slew Rate
Start-up Time
Stabilization Time
Current Consumption
Duty Cycle
Cycle-to-cycle Jitter
Aging
Pin 1 Function
EMI Reduction Rate
Total %
Down Spread
(D)
Center Spread
(C)
(EMI reduction is applied to the entire
spectrum)
0.5%
-0.5%
(D0.5)
±0.25
(C0.25)
-12 dB typical
1%
-1%
(D1)
±0.5
(C0.5)
-16 dB typical
2%
-2%
(D2)
±1.0
(C1.0)
-18 dB typical
For 12.5 MHz: 10.1 KHz min.; 11.7 KHz typical; 13.9 KHz max.
For 26 MHz: 21.1 KHz min.; 24.4 KHz typical; 29 KHz max.
For 42 MHz: 34.0 KHz min.; 39.4 KHz typical; 46.8 KHz max.
Frequency dependent. Call for details.
CMOS Square Wave
V
DD
= +1.8 ±0.15 V D.C.
Commercial
(-10°C to +70°C):
“A”: ±25 ppm ; “B’: ±50 ppm; “C”:±100 ppm
Industrial
(-40°C to +85°C):
“D”: ±25 ppm ; “E’: ±50 ppm; “F”:±100 ppm
1.6 V min.; 1.85 V max. I
OH
= -2 mA
0.0 V min.; 0.2 V max. I
OL
= 2 mA
2.5 n sec. max. (10%
V
DD
↔
90%
V
DD
)
15 pF max.
30
Ω
typical.
0.4 V/ns min.; 3.0 V/ns max. V
OL
-V
OH
, 15 pf Load
2 ms typical; 5 ms max.
40 ms max.
13 MHz: 2.0 mA typical
16 MHz: 2.8 mA typical
25 MHz: 3.5 mA typical
42 MHz: 5.0 mA typical
50%±10%. ( C
L
=15 pF
;
at 50%
V
DD
)
100 ps rms max.
±5 ppm per year max.; Ta=+25°C
Output is high impedance when taken low. Internal circuit is
When taken LOW
still operating.
When taken HIGH or float
Output
Output enable /disable time: 100 ns max.
Absolute Maximum Ratings
Power Supply Voltage V
DD
Input Voltage
Output Voltage
Operation Junction Temperature
Output Current
-0.5 V min; +2.5V max.
Vss-0.5V min.; V
DD
+0.5V max.
Vss-0.5V min.; V
DD
+0.5V max.
-40°C min.; +125°C max.
-13 mA min.; +13 mA max.
MERCURY
Page 2 of 5
Oct. 11. 2012
Rev. 0
EMI Reducing Spread Spectrum Clock Oscillators (SSXOs)
18HM Series (+1.8 V Supply Voltage)
Group “F”
Environmental Performance Specifications
RoHS Status
Moisture Sensitivity Level
Second Level Interconnect
Storage temp. range
Humidity
Fine Leak / Gross Leak
Solderability
Reflow
Vibration
Shock
Resistance to Solvent
Temperature Cycling
ESD Rating
Pad Surface Finish
Weight of the Device
MERCURY
Since 1973
RoHS compliant, Pb (lead) free in accordance with EU Directive 2002/95/EC
6/6 (2002/95/EC) and WEEE (2002/96/EC)
Level 1 (infinite) according to IPC/JEDEC J-STD-020D.1
e4
-55 to +125°C
85% RH, 85°C, 48 hours
MIL-Std-883, method 1014, condition A / MIL-Std-883, method 1014, condition C
MIL-STD-202F method 208E
260°C for 10 sec. 2X.
MIL-STD-202F method 204, 35G, 50 to 2000 Hz
MIL-STD-202F method 213B, test condi. E, 1000GG ½ sine wave
MIL-STD-202, method 215
MIL-STD-883, method 1010
>2000 V (per MIL-STD-883, method 3015)
Gold (0.3 um min.) over nickel (1.27 um to 8.89 um)
18HM572: 0.17 grams
18HM53: 0.09 grams
18HM32: 0.04 grams
Block Diagram
OE
Oscillator
VDD
VSS
PLL
SSXO Output
÷
Spread Spectrum
Modulator (KHz)
Part Number Format and Example:
Format:
Package
18HM
Code
_
Frequency
Stability Code
T
_
Frequency in MHz
F
_
Spread Type
Spread %
572
5x7x1.4 mm
53
3.2x5x1.0 mm
32
2.5x3.2x1.0 mm
Frequency Stability Code
“A”
Commercial
“B”
(-10°C ~+70°C)
“C”
“D”
Industrial
“E”
(-40°C ~+85°C)
“F”
±25 ppm
±50 ppm
±100 ppm
±25 ppm
±50 ppm
±100 ppm
Spread Type and Percentage
“D0.5”
“D1”
Down Spread
“D2”
“C0.25”
“C0.5”
Center Spread
“C1.0”
-0.5%
-1%
-2%
±0.25%
±0.5%
±1%
Example: 18HM572-BT-32.768F-C0.5
Description of the example:
+18V HM572 series 5x7 mm spread spectrum clock, frequency stability is ±50 ppm
over -10°C to +70°C, Tri-state on pin 1, 32.768 MHz, group “F”, center spread ±0.5
MERCURY
Page 3 of 5
Oct. 11. 2012
Rev. 0
EMI Reducing Spread Spectrum Clock Oscillators (SSXOs)
18HM Series (+1.8 V Supply Voltage)
Group “F”
HM572 Package Dimensions and Recommended Solder Pad Layout
18HM572 Package
5.00±0.15
7.00±0.15
MERCURY
Since 1973
unit: (mm)
0.75
18HM53 Package
4
3.2±0.2
3
2.2
1.20±0.1
1
2
1.20±0.10
1.4
1
4
2
3
1.2
2.2
0.6
1.4
2.0
1.25
R0
0.1
5.08
5.08
2.54 typ.
bottom view
2.54
top view
18HM32 Package
1.8
.7
Pin Connections:
Pin 1 OE
Pin 2 Ground
Pin 3 SSXO Output
Pin 4 +1.8V D.C.
Product Marking
Example of
HM572 package
Package code: 572
Stability code (A ~ F)
“T”:Tri-state on pin 1
Group “F
Spread type and percentage. Example: C1.5
Week number of the month. “1”~”5”
Month of the year.“A” for Jan.~”L” for Dec.
Year: “2” for 2012, “3” for 2013,etc
“18” for +1.8 V
DD
“HM572” product prefix
Frequency in MHz
Example: 100.000
Pin #1 indicator
18HM572 xT-F
xxx.xxx xx.x
MEC x x x
MERCURY
Page 4 of 5
Oct. 11. 2012
Rev. 0
1.2±0.1
5.0±0.2
R0
.2
EMI Reducing Spread Spectrum Clock Oscillators (SSXOs)
18HM Series (+1.8 V Supply Voltage)
Group “F”
Recommended Solder Reflow Profile
(per
IPC/JEDEC J-STD-020D.1)
MERCURY
Since 1973
Profile Feature
Sn-Pb Eutectic Assembly
Preheat/Soak
- Temperature min. (Ts min.)
100⁰C
- Temperature max. (Ts max.)
150⁰C
- Time (ts) (Ts min. to Ts max.)
60 to 120 seconds
Ramp-up rate (T
L
to Tp)
3⁰C / sec. max.
Liquidous temperature (T
L
)
183⁰C
Time (t
L
) maintained above T
L
60 to 150 seconds
Peak package body temperature (Tp)
235⁰C
Time (Tp) within 5⁰C of the classification temperature Tc 10 to 30 seconds
Ramp-down rate (Tp to T
L
)
6⁰C / second max.
6 minutes max.
Time 25⁰C to peak temperature
All temperatures refer to topside of the package, measured on the package body surface.
Pb-free Assembly
150⁰C
200⁰C
60 to 180 seconds
3⁰C / sec. max.
217⁰C
60 to 150 seconds
260⁰C
20 to 40 seconds
6⁰C / second max.
8 minutes max.
Product Support
Evaluation Board: Part number “
EVB-18HM-F”.
By toggling “HIGH” and “LOW” on two of the pins on this EVB, user
can quickly determine the proper spread percentage (proper EMI reduction rate) for his/her specific applications. Please
contact Mercury sales team.
Technical note:
TN-030 “How to use Mercury 1.8V EMI Reducing Spread Spectrum Clock Oscillators?”
Technical note:
TN-020 “Low EMI Spread Spectrum Clock Oscillators”
Product status: Active. Product availability: Now. Lead time: 5 to 6 weeks.
MERCURY
Page 5 of 5
Oct. 11. 2012
Rev. 0
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