Pl tronics, Inc.
.
19013 36th Ave. W, Suite H Lynnwood, WA 98036 USA
Manufacturer of High Quality Frequency Control Products
SM1145C Series
4 Lead Surface Mount Plastic Clock Oscillator
CMOS with Enable/ Disable
Use SM1145T or SM8845C Series for Non-Std Specs and Frequencies
Solder Pad Compatible to our SM11 Series, Epson SG615 & SG8002J
Standard Specifications
Overall Frequency Stability
Operating Temperature Range
Supply Voltage (Vcc)
Symmetry (Duty Cycle)
Logic Levels
Output Load
Enable/Disable Option (E/D)
1.000 MHz
–
60.000 MHz
Frequency Range
(MHz)
1.000
8.000
24.000
30.000
50.001
–
–
–
–
–
Max. Supply Current
Icc (mA) w/ 15pF load
3.3V
5.0V
7.999
23.999
29.999
50.000
60.000
5
10
10
20
25
10
15
15
30
40
Rise and Fall Time
Tr & Tf (nS) w/ 15pF load
Typical
Maximum
5.5
5.5
4.5
2.5
2.5
6.5
6.5
5.5
3.5
3.5
Part Numbering Guide
Packaging
Tube or
24mm tape
12mm pitch
Portions of the part number that appear after the frequency may not be marked on part (C of C provided)
SM11 45 C Y - 50.0M - 30 - XXX
(Internal Code or blank)
Model
Frequency Stability
45 = ± 50 PPM
44 = ± 25 PPM
Non-Std Output Load
Blank = 15 pF max, 30 = 30 pF max, 50 = 50 pF max
Frequency in MHz
Special Specifications (choose all that apply)
Y: Std Specs (5.0V
± 10%,
0 to +70
°
C, 40/60% Symmetry)
E: Extended Operating Temperature Range (- 40 to +85
°
C)
S: 45/55% Symmetry at 50% of Vcc
V: Supply Voltage of 3.3 volts
± 10%
Consult factory for available frequencies and specs. Not all options available for all frequencies. A special part number may be assigned.
Frequency Stability is inclusive of frequency shifts due to calibration, temperature, supply voltage, shock, vibration and load
Mechanical: inches (mm)
not to scale
Solder Pads
.15 (3.8)
0.01
m
F
bypass capacitor
Due to part size and factory abilities, part marking may vary from lot to lot and may contain our part number or an internal code.
.551 (14.0) MAX
.386 (9.8) MAX
.185 (4.7) MAX
4
.352 (8.95)
.300 (7.62)
4
Vcc
E/D
1
3
OUT
GND
2
3
.23 (5.8)
For Best Performance,
Do NOT allow any traces other
than ground under oscillators
(Even in buried layers)
.12
(3.0)
1
2
Jan 2003
.200 (5.08)
.05 (1.3)
Pl tronics, Inc.
(425) 776 -1880, Fax: (425) 776-2760, ple-sales@pletronics.com, www.pletronics.com
16
CMOS < 80 MHz
Page 12 - 19
SM1145C: ± 50 PPM, SM1144C: ± 25 PPM over Operating Temperature Range
0 to +70°C is standard, but can be extended to
-
40 to +85°C for certain frequencies
5.0 volts and 3.3 volts available, .01 µF bypass cap recommended
40/60 to 60/40% is standard, but 45/55% at 50% of Vcc is also available (see Waveform 1)
Logic “1”
90% of Vcc MIN;
Logic “0”
10% of Vcc MAX
Standard load is 15 pF (typ. 1 ASIC) maximum, see Test Circuit 2 (consult factory for
heavier
loads)
Output enabled when Pin #1 is open or at Logic “1”; Output disabled when Pin #1 is at Logic “0”.
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