VMEM
Military Clock Oscillator
VMEM
Description
Vectron’s VMEM high shock resistant Clock Oscillator is the next generation ruggedized silicon MEMS based stabilized square wave
generator with a CMOS output, operating off a +1.8, +2.5, +2.7 or +3.3Vdc supply.
The VMEM uses an internal compensation scheme to improve temperature stability which produces temperature performance equivalent
to quartz based products.
Features
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Silicon Resonator
High Shock Survivability
+1.8V, +2.5V, +2.7V or +3.3V Operation
CMOS Output
Output Frequencies to 150 MHz
Enable/Disable for Board Test and Debug
-20/70°C or –40/85°C Operating Temperature
Industry Standard 5.0 x 3.2, 3.2 x 2.5 or 2.5 x 2.0 SMD Footprints
Product is Compliant to RoHS Directive and Fully Compatible
with Lead Free Assembly
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Applications
Smart Munitions
Projectile Electronics
Missiles
High Shock & Vibration Applications
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
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Performance Specifications
Specifications
Table 1. Electrical Performance
Parameter
Frequency
Stability (ordering option)
Operating Temperature (ordering option)
Operating Supply Voltage
1
(ordering option)
Symbol
f
O
Δ f/f
o
T
OP
V
DD
Min
1.000
Typical
±25, ±50, ±100
-20/70 or -40/85
Maximum
150.000
Units
MHz
ppm
°C
1.65
2.3
2.45
3.0
1.8
2.5
2.7
3.3
3
4
5
6
1.95
2.7
2.95
3.6
6
8
10
12
1
V
V
V
V
mA
mA
mA
mA
uA
V
V
pf
ns
ns
%
ps
ps
Supply Current, Output Enabled
1 to 40MHz
40.01 to 80MHz
80.01 to 125MHz
125.01 to 150MHz
Supply Current, Output Disabled
Output Logic Levels
Output Logic High
2
Output Logic Low
2
Output Load
Output Rise/Fall Time
2
Duty Cycle
3
Period Jitter
4
, RMS, 80MHz Output
Peak to Peak
Start-up Time
Enable/Disable
5
Output Enabled
Output Disabled
1]
2]
3]
4]
5]
I
DD
I
DD
V
OH
V
OL
t
R
t
F
SYM
9
75
t
SU
V
IH
V
IL
0.75*V
DD
3
0.8*V
DD
0.2*V
DD
15
1.3
1.3
3
3
45/55
10
ms
V
V
0.25*V
DD
A 0.01uF and a 0.1uF capacitor should be located as close to the supply as possible (to ground) is recommended.
Figure 2 defines these parameters. Figure 1 illustrates the operating conditions under which these parameters are tested and specified.
Duty Cycle is measured defined as On Time/Period.
Measured using a Wavecrest SIA3300C, 90K samples
Output will be active if Enable/Disable is left open.
Description
I
DD
4
+
V
DD
-
.1μF
I
C
V
C
1
+
-
Period
3
2
15pF
V
OH
50%
V
OL
On Time
t
R
t
F
Fig 1: Test Circuit
Fig 2: Output Waveform
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Page2
Table 2. Absolute Maximum Ratings
Parameter
Power Supply
CMOS Input Voltage
Junction Temperature
Storage Temperature
Soldering Temperature / Duration
Symbol
V
DD
E/D
T
J
T
STR
T
PEAK
/ t
P
Ratings
-0.3 to +4.0
-0.3 to (V
DD
+0.3)
150
-62 to 125
260 / 40
Unit
V
V
°C
°C
°C / sec
Enable/Disable Functional Description
Under normal operation the E/D is set to a logic high state or logic low state. When E/D is set to a logic low, the oscillator stops
and the output is in a high impedance state. This helps reduce power consumption as well as facilitating board testing and
troubleshooting. When E/D is set to a logic high state, the oscillator produces an output. Leaving the Enable/Disable pin open
results in an active state with an output frequency.
Outline Drawing, 5.0x3.2 option
Suggested Pad Layout
Units: mm (inches)
Contact Pads are gold flash over palladium over nickel
Figure 3, 5.0x3.2 Package drawing
Table 3. Pin Out
Pin
1
2
3
4
Symbol
E/D
GND
f
O
V
DD
Function
Enable/Disable
Electrical Ground
Output Frequency
Supply Voltage
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
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Outline Drawing, 3.2x2.5 option
Suggested Pad Layout
Units: mm (inches)
Contact Pads are gold flash over pallladium over nickel
Figure 4, 3.2x2.5 Package drawing
Outline Drawing, 2.5x2.0 option
Suggested Pad Layout
Units: mm (inches)
Contact Pads are gold flash over palladium over nickel
Figure 5, 2.5x2.0 Package drawing
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Page4
Reliability
The VMEMxQ qualification tests were performed per MIL-PRF-55310 & the following environmental tests
Table 4. Environmental Compliance
Parameter
Mechanical Shock
Mechanical Vibration
Thermal Shock
Ambient Pressure Operating
Gross and Fine Leak
Resistance to Solvents
Salt Atmosphere
Moisture Resistance
Low Temperature Storage Life
Conditions
MIL-STD-202, Method 213, Condition F except 30,000g, 0.1 ms
MIL-STD-883, Method 2007, Condition C, 100g
MIL-STD-202, Method 107, Condition B
MIL-STD-202, Method 105, Condition E
MIL-STD-883, Method 1014, Condition A2 & C
MIL-STD-202, Method 215
MIL-STD-883, Method 1009, Condition A
MIL-STD-202, Method 106
JESD22-A119, Condition B
Handling Precautions
Although ESD protection circuitry has been designed into the the VMEMxQ, proper precautions should be taken when handling
and mounting. VI employs a Human Body Model and a Charged-Device Model (CDM) for ESD susceptibility testing and design
protection evaluation. ESD thresholds are dependent on the circuit parameters used to define the model.
Table 5. ESD Ratings
Model
Human Body Model
Charged Device Model
Machine Model
Minimum
2000V
500V
200 V
Suggested IR Profile
Devices are built using lead free epoxy and can also be subjected to standard lead free IR reflow conditions. Figure 6 shows max
temperatures and lower temperatures can also be used e.g. peak temperature of 220C.
Table 6. Reflow Profile
Parameter
PreHeat Time
Ts-min
Ts-max
Ramp Up
Time Above 217 °C
Peak Temperature
Time To Peak Temperature
Time at Peak Temperature
Ramp Down
Symbol
t
S
Value
60 sec Min, 260 sec Max
150°C
200°C
3 °C/sec Max
60 sec Min, 150 sec Max
255-260°C
480 sec Max
20 sec Max
6 °C/sec Max
R
UP
t
L
t
P
T
25C to Peak
t
P
R
DN
Figure 6
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
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