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NB3N501 Datasheet(PDF) 5 Page - ON Semiconductor |
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NB3N501 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 6 page NB3N501 http://onsemi.com 5 APPLICATIONS INFORMATION High Frequency CMOS/TTL Oscillators The NB3N501, along with a low frequency fundamental mode crystal, can build a high frequency TTL output oscillator. For example, a 20 MHz crystal connected to the NB3N501 with the 5X output selected (S1 = L, S0 = H) produces an 100 MHz CMOS/TTL output clock. Decoupling and External Components The NB3N501 requires a 0.01 mF decoupling capacitor to be connected between VDD and GND on pins 2 and 3. It must be connected close to the NB3N501 to minimize lead inductance. Control input pins can be connected to device pins VDD or GND, or to the VDD and GND planes on the board. Series Termination Resistor A 33 W terminating resistor can be used next to the CLK pin for trace lengths over one inch. Crystal Load Capacitors The total on chip capacitance is approximately 12 pF. A parallel resonant, fundamental mode crystal should be used. The device crystal connections should include pads for small capacitors from X1 to ground and from X2 to ground. These capacitors are used to adjust the stray capacitance of the board to match the nominally required crystal load capacitance. Because load capacitance can only be increased in this trimming process, it is important to keep stray capacitance to a minimum by using very short PCB traces (and no vias) between the crystal and device. Crystal capacitors, if needed, must be connected from each of the pins X1 and X2 to ground. The value (in pF) of these crystal caps should equal (CL − 12 pF) * 2. In this equation, CL = crystal load capacitance in pF. Example: For a crystal with a 16 pF load capacitance, each crystal capacitor would be 8 pF [(16 − 12) x 2 = 8]. ORDERING INFORMATION Device Package Shipping† NB3N501DG SOIC−8 (Pb−Free) 98 Units / Rail NB3N501DR2G SOIC−8 (Pb−Free) 2500 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. |
Similar Part No. - NB3N501_13 |
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Similar Description - NB3N501_13 |
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