MEMS Programmable
Oscillator
Page 1 of 6
CMC251-SERIES
■ Low Power Oscillator
■ HCMOS/ LVCMOS output
■ SMD package 2.5 x 2.0 mm
ELECTRICAL SPECIFICATIONS
PARAMETER
SYMBOL
CONDITION
Min.
VALUE
Typ.
Max.
110.0
3.3
3.5
3.7
3.8
3.8
-20
-40
4.1
4.2
4.5
4.5
+70
+85
+20
+25
+50
UNIT
Frequency Range
Supply Voltage
f
0
Vs
Any Frequency between Frequency
range, accurate to
6 decimal places
Vs = 1.8V,
f
0
=20MHz, no load
1.0
1.8
MHz
V
mA
mA
mA
mA
C
°C
ppm
ppm
ppm
V
Supply Current
Is
Vs = 2.5V,
f
0
=20MHz, no load
Vs = 2.8V,
f
0
=20MHz, no load
Vs = 3.3V,
f
0
=20MHz, no load
Operating Temperature
T
a
Including First Year aging, initial
frequency tolerance at 25°C,
Frequency stability over
temperature range, supply variation,
load variation
Enable = Open or“1”(V
IH
≥0.75Vs)
( output signal active )
Disable = GND or “0”(V
IL
<0.25Vs )
( output high impedance, oscillator
operates )
Standby = GND or “0” V
IL
<0.25Vs )
( output weakly pulled down,
oscillator sleep mode )
Frequency Stability
Δf/f
0
-20
-25
-50
0.75Vs
0.25Vs
V
Enable / Disable/ Standby Function
E/D/St
0.25Vs
V
Enable / Disable Time
T
E/D
f
0
=110MHz
Vs=1.8V, E/D =GND
Vs=2.5V to 3.3V, E/D =GND
Output in high impedance state
STBY=GND,Vs=1.8V
STBY=GND,Vs=2.5V
STBY=GND,Vs=2.8V to 3.3V
Output is weakly pulled down
0.2
1.1
2.1
1.3
2.5
4.3
130
4.0
4.2
ms
mA
mA
Enable / Disable Current
I
E/D
Standby Current
Istby
Startup Time
RMS Phase Jitter
RMS Period Jitter
Peak to Peak Period Jitter
T
ST
J
PH
J
P
J
PK-PK
5
ms
ps
ps
ps
ps
ps
f
0
=75MHz,BW 900KHz to 7.5MHz
f
0
=75MHz,BW 12KHz to 20MHz
f
0
=75MHz
f
0
=75MHz,Vs=2.5 to 3.3V
f
0
=75MHz, Vs=1.8V
0.5
1.3
1.8
12
14
0.9
2.0
3
25
30
RALTRON ELECTRONICS
10400 N.W . 33
rd
St
Miam i, Florida 33172
U.S.A.
phone: +1-305-593-6033
fax: +1-305-594-3973
e-mail: sales@raltron.com
internet: http://www.raltron.com
MEMS Programmable
Oscillator
Page 2 of 6
CMC251-SERIES
OUTPUT CHARACTERISTICS
VALUE
PARAMETER
SYMBOL
CONDITION
I
oh
= -2 mA ( Vs=1.8V )
I
oh
= -3 mA ( Vs= 2.5V or 2.8V )
I
oh
= -4 mA ( Vs=3.0V or 3.3V )
I
ol
=2 mA ( Vs=1.8V )
I
ol
=3 mA ( Vs= 2.5V or 2.8V )
I
ol
=4 mA ( Vs=3.0V or 3.3V )
50% Output level
Ta=25 °C
Min
0.9 Vs
Typ.
Max
UNIT
V
LVCMOS
V
OH
Output Levels
V
OL
Duty Cycle
Output Load
0.1Vs
45
15
55
60
V
%
pF
DC
O
CL
Table 1. Rise/Fall Time vs. CLoad ( CL ), Vs=1.8V
CL
Drive Strength
D0, default
D1
D2
D3
D4
D5
D6
D7
5pF
@20% to 80%
0.65
0.70
0.78
0.93
1.65
2.11
3.19
6.16
15pF
(ns) typ.
1.30
1.48
1.66
1.91
3.23
4.31
6.35
11.61
2.40
2.64
2.94
3.32
5.79
7.65
11.00
22.00
3.35
3.68
4.09
4.66
8.18
10.77
16.01
31.27
4.56
5.09
5.74
6.48
11.08
14.47
21.52
39.91
30pF
45pF
60pF
Table 2. Rise/Fall Time vs. CLoad ( CL ), Vs=2.5V
CL
Drive Strength
D0
D1
D2, default
D3
D4
D5
D6
D7
5pF
@20% to 80%
0.34
0.43
0.54
0.62
1.09
1.45
2.11
4.13
15pF
(ns) typ.
0.88
0.96
1.00
1.28
2.20
2.81
4.27
8.25
1.64
1.81
2.01
2.27
3.88
5.16
7.64
12.82
2.54
2.79
3.10
3.51
5.86
7.65
11.20
21.45
3.32
3.65
4.01
4.45
7.57
9.88
14.49
27.79
30pF
45pF
60pF
RALTRON ELECTRONICS
10400 N.W . 33
rd
St
Miam i, Florida 33172
U.S.A.
phone: +1-305-593-6033
fax: +1-305-594-3973
e-mail: sales@raltron.com
internet: http://www.raltron.com
MEMS Programmable
Oscillator
Page 3 of 6
CMC251-SERIES
Table 3. Rise/Fall Time vs. CLoad ( CL ), Vs=2.8V
CL
Drive Strength
D0
D1
D2, default
D3
D4
D5
D6
D7
5pF
@20% to 80%
0.29
0.34
0.44
0.55
0.97
1.29
1.94
3.77
15pF
(ns) typ.
0.81
0.88
1.00
1.12
2.00
2.57
3.90
7.54
1.48
1.64
1.83
2.08
3.54
4.72
7.03
12.28
2.29
2.52
2.82
3.22
5.43
7.01
10.24
19.57
2.99
3.30
3.67
4.08
6.93
9.06
13.34
25.27
30pF
45pF
60pF
Table 4. Rise/Fall Time vs. CLoad ( CL ), Vs=3.0V
CL
Drive Strength
D0
D1
D2
D3, default
D4
D5
D6
D7
5pF
@20% to 80%
0.27
0.30
0.38
0.51
0.89
1.22
1.84
3.60
15pF
(ns) typ.
0.76
0.83
0.92
1.00
1.92
2.46
3.71
7.21
1.39
1.55
1.72
1.97
3.39
4.54
6.72
11.97
2.16
2.40
2.71
3.07
5.20
6.76
9.86
18.74
2.85
3.13
3.51
3.90
6.64
8.62
12.68
24.30
30pF
45pF
60pF
Table 5. Rise/Fall Time vs. CLoad ( CL ), Vs=3.3V
CL
Drive Strength
D0
D1
D2
D3, default
D4
D5
D6
D7
5pF
@20% to 80%
0.25
0.28
0.33
0.46
0.81
1.16
1.74
3.39
15pF
(ns) typ.
0.72
0.79
0.87
1.00
1.82
2.33
3.50
6.88
1.31
1.46
1.64
1.86
3.22
4.29
6.38
11.63
1.83
2.05
2.30
2.60
4.52
6.04
8.98
17.56
2.61
2.93
3.35
3.84
6.33
8.34
12.19
23.59
30pF
45pF
60pF
RALTRON ELECTRONICS
10400 N.W . 33
rd
St
Miam i, Florida 33172
U.S.A.
phone: +1-305-593-6033
fax: +1-305-594-3973
e-mail: sales@raltron.com
internet: http://www.raltron.com
MEMS Programmable
Oscillator
Page 4 of 6
CMC251-SERIES
MECHANICAL DIMENSIONS AND PIN FUNCTIONING
RECONMENDED LAND PATTERN
BOTTOM VIEW
PIN
SYMBOL
FUNCTION
H :Enable output frequency
L:Disable output frequency , high impedance
In E/D or STBY mode connect a pull-up resistor of 10kΩ to pin 1, in
case not externally driven.
In case pin1 is left floating, use N option
Electrical Ground
Output Signal
Supply Voltage
1
E/D/STBY/N
2
3
4
GND
OUTPUT
Vs
Note: Connect a capacitor of 0.1F or higher value between Vs and GND
RALTRON ELECTRONICS
10400 N.W . 33
rd
St
Miam i, Florida 33172
U.S.A.
phone: +1-305-593-6033
fax: +1-305-594-3973
e-mail: sales@raltron.com
internet: http://www.raltron.com
MEMS Programmable
Oscillator
Page 5 of 6
CMC251-SERIES
ENVIRONMENTAL
REFLOW PROFILE
Soldering
Moisture Sensitivity Level
Temperature Cycle
Vibration
Mechanical Shock
Storage Temperature
MIL-STD-883F, Method 2003
MSL 1 at 260°C
JESD22, Method A104
MIL-STD-883F, Method 2007
MIL-STD-883F, Method 2002
-65° ……. +150°C
REFLOW PROFILE
t
P
T
P
Ramp-up
Critical Zone
T
L
to T
P
T
L
T
SMAX
Temp.
[°C]
T
SMIN
t
S
Preheat
t
L
Ramp-down
t[25°C] to Peak
Time [sec]
Temperature Min Preheat
Temperature Max Preheat
Time (T
SMIN
to T
SMAX
)
Temperature
Peak Temperature
Ramp-up rate
Ramp-down rate
Time within 5°C of Peak Temperature
Time t[25°C] to Peak Temperature
Time
Recommended Solder Reflow Profile
T
SMIN
T
SMAX
t
S
T
L
T
P
R
UP
R
DOWN
t
P
t[25°C] to Peak
t
L
150°C
200°C
60-180 sec.
217°C
260°C
3°C/sec max.
6°C/sec max.
10 sec
480 sec.
60-150 sec.
RALTRON ELECTRONICS
10400 N.W . 33
rd
St
Miam i, Florida 33172
U.S.A.
phone: +1-305-593-6033
fax: +1-305-594-3973
e-mail: sales@raltron.com
internet: http://www.raltron.com
国产芯片交流
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
