Pl tronics, Inc.
.
19013 36th Ave. W, Suite H Lynnwood, WA 98036 USA
Manufacturer of High Quality Frequency Control Products
SM7745H CMOS Series
CMOS with Enable/ Disable or Optional Stand By Mode (3.3 V)
Fundamental or 3rd Overtone Crystal Used
4 Pad 7 x 5mm Leadless Surface Mount Ceramic Clock Oscillator
Standard Specifications
Overall Frequency Stability
Operating Temperature Range
Supply Voltage (Vcc)
Symmetry (Duty Cycle)
Logic Levels
Output Load
Enable/Disable Option (E/D)
Frequency Range
(MHz)
1.500 MHz
–
69.999 MHz
SM7745H:
±
50 PPM, SM7744H:
±
25 PPM, SM7720H:
±
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 volts, 3.3 volts and 2.5 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”.
Max. Supply Current
Icc (mA) w/ 15pF load
2.5V, 3.3V
5.0V
Max. Rise and Fall Time
Tr & Tf (nS) w/ 15pF load
2.5V to 5.0V
1.500
11.000
24.000
30.000
46.000
–
–
–
–
–
10.999
23.999
29.999
45.999
69.999
7
15
15
20
25
10
15
20
30
45
5.0
5.0
5.0
5.0
4.5
Part Numbering Guide
Portions of the part number that appear after the frequency may not be marked on part (C of C provided)
SM77 45 H V - 50.0M - SB - 30 - XXX
(Internal Code or blank)
Packaging
Non-Std Output Load
Blank = 15 pF max, 30 = 30 pF max
Model
Tray or
Optional Stand By Mode (3.3 volt only)
16mm tape
Frequency Stability
8mm pitch
Frequency in MHz
45 = ± 50 PPM
44 = ± 25 PPM
20 = ± 20 PPM
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%
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.
0.276 (7.0 ± .15)
0.200 (5.08)
PIN
SIGNAL
E/D or SB
GND
OUT
Vcc
0.004 (0.10)
.01
m
F
bypass
capacitor
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)
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)
Aug 2005
Pl tronics, Inc.
(425) 776 -1880, Fax: (425) 776-2760, ple-sales@pletronics.com, www.pletronics.com
12
CMOS < 80 MHz
Page 11A - 16
DSP 与 ARM 处理器
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