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SN74LVC1404YZPR Datasheet(PDF) 8 Page - Texas Instruments |
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SN74LVC1404YZPR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 18 page www.ti.com APPLICATION INFORMATION of C1 and C2 are chosen so that C L + C 1C2 C 1 ) C2 and C1 ≈ C2. Rs is the current-limiting resistor, and the value resonance frequency, i.e., Rs + X C 2 . RF is the feedback resistor that is used to bias the inverter in the linear CTRL(1) RF ≅ 2.2 MΩ CL ≅ 16 pF C1 ≅ 32 pF C2 ≅ 32 pF XOUT XIN OSCOUT Y A Optional Signal-Conditioning Stage CLOAD RLOAD CLOAD RLOAD (1) CTRL should be tied to logic high during normal operation of the oscillator circuit. To disable the oscillator circuit, connect CTRL to logic low. A) Logic Diagram View Rs ≅ 1 kΩ SN74LVC1404 OSCILLATOR DRIVER FOR CRYSTAL OSCILLATOR OR CERAMIC RESONATOR SCES469D – AUGUST 2003 – REVISED JANUARY 2007 Figure 3 shows a typical application of the SN74LVC1404 in a Pierce oscillator circuit. The output voltage can be conditioned further by connecting OSCOUT to the Schmitt-trigger input inverter. The Schmitt-trigger input inverter produces a rail-to-rail voltage waveform. The recommended load for the crystal, shown in this example, is 16 pF. The value of the recommended load (CL) can be found in the crystal manufacturer's data sheet. Values depends on the maximum power dissipation of the crystal. Generally, the recommended value of Rs is specified in the crystal manufacturer's data sheet and, usually, this value is approximately equal to the reactance of C2 at region of operation. Usually, the value is chosen to be within 1 M Ω to 10 MΩ. Figure 3. Oscillator Circuit 8 Submit Documentation Feedback |
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