In a typical IC monostable multivibrator circuit, at the falling edge of the tri

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Question
In a typical IC monostable multivibrator circuit, at the falling edge of the trigger input, the output switches HIGH for a period of time determined by the ________.
Options
A. value of the RC timing components
B. amplitude of the input trigger
C. frequency of the input trigger
D. magnitude of the dc supply voltage

Correct Answer

value of the RC timing components

Multivibrators and 555 Timer problems

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1. If V_cc of a 555 timer circuit is set to +10 V what is the level of output voltage from the circuit?
Options
A. V_OH = 10 V, V_OL = 0 V
B. V_OH = 10 V, V_OL = 0.1 V
C. V_OH = 8.5 V, V_OL = 0 V
D. V_OH = 8.5 V, V_OL = 0.1 V

2. When the inputs to a flip-flop are changing at the same time that the active trigger edge of the input clock is making its transition, this condition is called:
Options
A. racing
B. toggling
C. slave loading
D. pulse timing

4. The output of a standard TTL NAND gate is used to pull an LED indicator LOW. The LED is in series with a 470-Ω resistor. What is the current in the circuit when the LED is on?
Options
A. 7.02 mA
B. 8.51 mA
C. 10.63 mA
D. 5.32 mA

7. To obtain a 50% duty cycle in an astable 555 timer circuit:
Options
A. t_LO = t_HI
B. R_A = R_B and short R_B with a diode during the capacitor charging cycle
C. capacitor voltage must rise above 1/3 V_CC
D. t_LO = t_HI, R_A = R_B, and short R_B with a diode during the capacitor charging cycle

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