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MC1455P1 数据表(PDF) 9 Page - Texas Instruments |
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MC1455P1 数据表(HTML) 9 Page - Texas Instruments |
9 / 21 page LM555 www.ti.com SNAS548C – FEBRUARY 2000 – REVISED MARCH 2013 The charge time (output high) is given by: t1 = 0.693 (RA + RB) C (1) And the discharge time (output low) by: t2 = 0.693 (RB) C (2) Thus the total period is: T = t1 + t2 = 0.693 (RA +2RB) C (3) The frequency of oscillation is: (4) Figure 17 may be used for quick determination of these RC values. The duty cycle is: (5) Figure 17. Free Running Frequency FREQUENCY DIVIDER The monostable circuit of Figure 12 can be used as a frequency divider by adjusting the length of the timing cycle. Figure 18 shows the waveforms generated in a divide by three circuit. VCC = 5V Top Trace: Input 4V/Div. TIME = 20 μs/DIV. Middle Trace: Output 2V/Div. RA = 9.1kΩ Bottom Trace: Capacitor 2V/Div. C = 0.01 μF Figure 18. Frequency Divider PULSE WIDTH MODULATOR When the timer is connected in the monostable mode and triggered with a continuous pulse train, the output pulse width can be modulated by a signal applied to pin 5. Figure 19 shows the circuit, and in Figure 20 are some waveform examples. Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM555 |
类似零件编号 - MC1455P1 |
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类似说明 - MC1455P1 |
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