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A5191HRTNG-XTP Datasheet(PDF) 10 Page - ON Semiconductor |
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A5191HRTNG-XTP Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 14 page A5191HRT http://onsemi.com 10 Internal Oscillator Option The oscillator cell will function with either a 460.8 kHz crystal or ceramic resonator. A parallel resonant ceramic resonator can be connected between XIN and XOUT. Figure 12 illustrates the crystal option for clock generation using a 460.8 kHz ( ±1 % tolerance) parallel resonant crystal and two tuning capacitors Cx. The actual values of the capacitors may depend on the recommendations of the manufacturer of the resonator. Typically, capacitors in the range of 100 pF to 470 pF are used. XOUT XIN CX CX 460.8 kHz Crystal Oscillator Figure 12. Crystal Oscillator External Clock Option It may be desirable to use an external 460.8 kHz clock as shown in Figure 13 rather than the internal oscillator. In addition, the A5191HRT consumes less current when an external clock is used. Minimum current consumption occurs with the clock connected to XOUT and XIN connected to VSS. XOUT XIN Crystal Oscillator 460.8 kHz Figure 13. Oscillator with External Clock Power On Reset During start-up the RESETB pin should be kept low until the voltage level on VDD is above the minimum level VDDH = 2.5 V to guarantee correct operation of the digital circuitry. As illustrated in Figure 14 RESETB should be kept low for at least tPOR = 10 ns after this threshold level is reached. tPOR =10 ns VDDH =2.5 V VDD t RESET pin Figure 14. Power On Reset Timing |
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Similar Description - A5191HRTNG-XTP |
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