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LMC555 Datasheet(PDF) 9 Page - Texas Instruments |
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LMC555 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 21 page LMC555 www.ti.com SNAS558J – FEBRUARY 2000 – REVISED MARCH 2013 FREQUENCY DIVIDER The monostable circuit of Figure 5 can be used as a frequency divider by adjusting the length of the timing cycle. Figure 11 shows the waveforms generated in a divide by three circuit. VCC = 5V Top Trace: Input 4 V/Div. TIME = 20 µs/Div. Middle Trace: Output 2 V/Div. RA = 9.1 kΩ Bottom Trace: Capacitor 2 V/Div. C = 0.01 µF Figure 11. Frequency Divider Waveforms 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 the Control Voltage Terminal. Figure 12 shows the circuit, and in Figure 13 are some waveform examples. Figure 12. Pulse Width Modulator VCC = 5V Top Trace: Modulation 1 V/Div. TIME = 0.2 ms/Div. Bottom Trace: Output Voltage 2 V/Div. RA = 9.1 kΩ C = 0.01 µF Figure 13. Pulse Width Modulator Waveforms Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LMC555 |
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