Pl tronics, Inc.
.
19013 36th Ave. W, Suite H Lynnwood, WA 98036 USA
Manufacturer of High Quality Frequency Control Products
PE7745D PECL Series
6 Pad 7x5mm Leadless Surface Mount Ceramic Clock Oscillator
Differential PECL Output with Enable/ Disable Function
Standard Specifications
Overall Frequency Stability
Operating Temperature Range
Supply Voltage (Vcc)
Supply Current (Icc)
Jitter
Output Load
Enable/Disable Option (E/D)
Output Waveform
PECL with Differential Output
(see Waveform 2)
± 50 PPM, ± 25 PPM, ± 20 PPM over Operating Temperature Range
0 to +80°C is standard, but can be extended to
−
40 to +85°C for certain frequencies
3.3 volts ± 10% standard, but 5.0 volts or 2.5 volts also available
60 to 70 mA typical, 90 mA maximum for
≥
70 MHz.
For < 70 MHz, consult factory
1 pS RMS maximum,
from 12 kHz to 20 MHz from carrier
for
≥
70 MHz.
For < 70 MHz, consult factory
Output must be terminated into 50 ohms to (Vcc - 2.0 V). See Test Circuit 5 and Note 1.
Output enabled when Pin 1 is open or at CMOS Logic “1”;
Output disabled when Pin 1 is at CMOS Logic “0”.
Symmetry
Tr & Tf
Logic “1”
Logic “0”
45/55% to 55/45% at 50% of Vcc level standard, tighter symmetry available
1.0 nS max (20 to 80%) for
≥
70 MHz.
For < 70 MHz, consult factory
Vcc - 1.025 volts minimum
Vcc - 1.620 volts maximum
10.00 MHz – 170.00 MHz
See PE1145T for
higher
frequencies
Note 1:
In the typical PECL 100K logic output Voh is 2.35 volts and Vol is 1.60 volts at 3.3 Vcc. The center voltage of the PECL is therefore1.975 volts.
If a 50 ohm resistor is placed between the output and Vcc – 2 volts (1.3 volts), the current through the resistor is (1.975 – 1.3) / 50 = 13.5 mA.
The same load can be simulated by a resistor of 147 ± 1% ohms to ground (1.975 / 0.0135 = 146.29 ohms). If additional load current is placed
on the output, its load current must be subtracted from the 13.5 mA to calculate a new load resistor. Using similar calculations, use 274 ± 1%
ohms to ground for 5.0V operation.
Part Numbering Guide
Packaging
Tray or
16mm tape,
8mm pitch
PE77 45 D Y -- 70.0M
Model
Frequency Stability
45 = ± 50 PPM
44 = ± 25 PPM
20 = ± 20 PPM
Frequency in MHz
Special Specifications (choose all that apply)
E: Extended Operating Temperature Range (- 40 to +85
°
C)
F: 47.5 /52.5% Symmetry at 50% of Vcc
V: Supply Voltage of 3.3 volts
±
10%
W: Supply Voltage of 2.5 volts
± 5
%
Y: Supply Voltage of 5.0 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
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.
Solder Pads
.197
(5.0 ± .2)
.08 .09 .08
(2.0) (2.2) (2.0)
5
QN
6
Vcc
.276 (7.0 ± .2)
PLE
4
Q Out
.200 (5.08)
6
1
.05
(1.3)
5
2
4
3
.075 (1.9)
MAX
GND
3
N.C.
2
E/D
1
May 2002
Pl tronics, Inc.
(425) 776 -1880, Fax: (425) 776-2760, ple-sales@pletronics.com, www.pletronics.com
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