19013 36th Ave. West Suite H Lynnwood, WA 98036, USA
SM8845C Series
4 Pad 9.1 x 7.1mm Leadless Surface Mount Ceramic Clock Oscillator
CMOS with Enable/ Disable
Recommended for Non-Std Specs and Frequencies
–
1.000 MHz 80.000 MHz
Standard Specifications
Overall Frequency Stability
SM8845C: ± 50 PPM, SM8844C: ± 25 PPM, SM8820C: ± 20 PPM over Operating Temp. Range
-
°
Operating Temperature Range 0 to +70 C is standard, but can be extended to 40 to +85°C for certain frequencies
Supply Voltage (Vcc)
Symmetry (Duty Cycle)
Logic Levels
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
Output Load
Enable/Disable Option (E/D)
Standard load is 15pF 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”.
Rise and Fall Time
Supply Current
Icc (mA) w/ 15pF load
Frequency Range
(MHz)
Tr & Tf (nS) w/ 15pF load
Typical
5.0
Maximum
10.0
Typical
4.0
Maximum
5.0
–
1.000 25.000
–
25.001 50.000
10.0
20.0
3.0
4.0
–
50.001 80.000
20.0
25.0
3.5
4.5
Part Numbering Guide
SM88 45 C Y -- 50.0M - 30
Packaging
Tray or
24mm tape
12mm pitch
Non-Std Output Load
Blank = 15 pF max, 30 = 30 pF max, 50 = 50 pF max
Model
Frequency in MHz
Frequency Stability
45 = ± 50 PPM
Special Specifications (choose all that apply)
°
Y: Std Specs (5.0V ± 10%, 0 to +70 C, 40/60% Symmetry)
44 = ± 25 PPM
20 = ± 20 PPM
°
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
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.
.157 (4.0)
2
3
3
2
1
0.01 F
m
GND
OUT
bypass
capacitor
1
4
.07 (1.8)
4
Vcc
E/D
.08 (2.0)
.280 (7.1 ± .1)
Jan 2002
.075 (1.9) MAX
(425) 776 -1880, Fax: (425) 776-2760, ple-sales@pletronics.com, www.pletronics.com
12
Pl tronics, Inc.