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LMC555MDA Datasheet(PDF) 9 Page - Texas Instruments |
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LMC555MDA Datasheet(HTML) 9 Page - Texas Instruments |
9 / 28 page 9 LMC555 www.ti.com SNAS558M – FEBRUARY 2000 – REVISED JULY 2016 Product Folder Links: LMC555 Submit Documentation Feedback Copyright © 2000–2016, Texas Instruments Incorporated Device Functional Modes (continued) VCC = 5 V Top Trace: Input 5 V/Div. TIME = 0.1 ms/Div. Middle Trace: Output 5 V/Div. RA = 9.1 kΩ Bottom Trace: Capacitor Voltage 2 V/Div. C = 0.01 µF Figure 4. Monostable Waveforms Reset overrides Trigger, which can override threshold. Therefore the trigger pulse must be shorter than the desired tH. The minimum pulse width for the Trigger is 20 ns, and it is 400 ns for the Reset. During the timing cycle when the output is high, the further application of a trigger pulse will not effect the circuit so long as the trigger input is returned high at least 10 µs before the end of the timing interval. However the circuit can be reset during this time by the application of a negative pulse to the reset terminal. The output will then remain in the low state until a trigger pulse is again applied. When the reset function is not use, it is recommended that it be connected to V+ to avoid any possibility of false triggering. Figure 5 is a nomograph for easy determination of RC values for various time delays. NOTE In monstable operation, the trigger should be driven high before the end of timing cycle. Figure 5. Time Delay |
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