Pl tronics, Inc.
.
19013 36th Ave. W, Suite H Lynnwood, WA 98036 USA
Manufacturer of High Quality Frequency Control Products
SM7745D CMOS Series
CMOS with Enable/ Disable, 3rd Overtone Crystal Used
Low Jitter
Standard Specifications
Overall Frequency Stability
Operating Temperature Range
Supply Voltage (Vcc)
Symmetry (Duty Cycle)
Logic Levels
Jitter
Output Load
Enable/Disable Option (E/D)
SM7745D:
±
50 PPM, SM7744D:
±
25 PPM, SM7720D:
±
20 PPM over Operating Temp. Range
0 to +70°C is standard, but can be extended to - 40 to +85°C for certain frequencies
5.0, 3.3, and 2.5 volts available, .01 µF bypass cap recommended, consult factory for 1.8 volts
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
1 pS RMS maximum,
from 12 kHz to 20 MHz from carrier
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”.
70.00 MHz
–
170.00 MHz
Consult factory for
higher
frequencies
See Website for Supply Current (Icc) and Rise and Fall Times
Part Numbering Guide
Portions of the part number that appear after the frequency may not be marked on part (C of C provided)
Packaging
Tray or
16mm tape
8mm pitch
SM77 45 D V - 70.0M - 30 - XXX
(Internal Code or blank)
Model
Frequency Stability
45 = ± 50 PPM
44 = ± 25 PPM
20 = ± 20 PPM
Non-Std Output Load
Blank = 15 pF max, 30 = 30 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%
W: Supply Voltage of 2.5 volts ±
5%
X:
Supply Voltage of 1.8 volts ±
5% (Consult factory)
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)
0.276 (7.0 ± .15)
not to scale
Solder Pads
0.200 (5.08)
PIN
SIGNAL
E/D
GND
OUT
Vcc
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.
0.197
(5.0 ± .15)
3
2
0.200 (5.08)
0.075 (1.9)
MAX
0.055
(1.4)
4
1
0.024
(0.60)
0.004 (0.10)
.01
m
F
bypass
capacitor
4
3
0.087 (2.2)
0.050 (1.27)
1
2
0.079 (2.0)
1
2
3
4
0.055
(1.4)
0.145
(3.68)
Sept 2004
Pl tronics, Inc.
(425) 776 -1880, Fax: (425) 776-2760, ple-sales@pletronics.com, www.pletronics.com
8
CMOS
70 - 170 MHz, 3rd OT
Page 8 - 11
4 Pad 7 x 5mm Leadless Surface Mount Ceramic Clock Oscillator
嵌入式系统
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