IC 555.pptx
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The IC 555 is an 8-pin integrated circuit capable of producing accurate time delays and oscillations. It has three main operating modes - monostable, astable, and bistable - each representing a different type of circuit with a particular output. In astable mode, the output switches continuously between high and low without intervention, producing a square wave. In monostable mode, the output stays low until triggered and then produces one pulse of set length. In bistable mode, the two stable states are high and low, and inputs trigger or reset the state.
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The 555 timer IC is a versatile integrated circuit that is commonly used to generate accurate time delays or oscillations. It operates on voltages between 5-18V and can source or sink 200mA of current. The 555 timer contains 25 transistors, 2 diodes, and 15 resistors on a silicon chip in an 8-pin package. It has three operating modes - astable, monostable, and bistable - and can be used for applications like timers, pulse generation, and flip-flops. The name '555' comes from the three 5kΩ resistors inside the chip.
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The document discusses the 555 timer integrated circuit. It provides a description of the 555 timer, including its applications in generating ramp and square waves, frequency division, and pulse generation. It also covers the pin descriptions and diagrams of the 555 timer chip and provides explanations of how it can be used in monostable multivibrator, astable multivibrator, and bistable multivibrator circuits. Examples and applications of these circuits are also discussed.
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This document discusses the 555 timer integrated circuit and its use in building a digital clock circuit. It provides details on the 555 timer pins and its three operating modes: astable, monostable, and bistable. It then describes a digital clock circuit built using a 555 timer chip that displays time on 7-segment displays and can be set using buttons. Links are provided for additional information on 555 timer clocks.
Ic 555
1.Introduction
The 555 IC was designed in 1971 by Hans Camenzind under contract to SigNetics Corporation.
555 timer is a highly stable circuit used to generate time delays, or Oscillations.
A single 555 timer can provide time delay ranging from microseconds to hours.
It operates from a wide range of power supplies ranging from + 5 Volts to + 18 Volts supply voltage.
2.Pin Configuration
3.Working of Pin
4.555 Integral circuit
5.Operating modes of IC
6. Bistable Mode
In bistable (also called Schmitt trigger) mode, the 555 timer acts as a basic flip-flop.
The trigger and reset inputs (pins 2 and 4 respectively on a 555) are held high via pull-up resistors while the threshold input (pin 6) is simply floating.
Thus configured, pulling the trigger momentarily to ground acts as a 'set' and transitions the output pin (pin 3) to Vcc (high state).
Pulling the reset input to ground acts as a 'reset' and transitions the output pin to ground (low state). No timing capacitors
Pin 5 (control voltage) is connected to ground via a small-value capacitor (usually 0.01 to 0.1 μF). Pin 7 (discharge) is left floating
7.Monostable Mode
Pulse generator circuit which the period is calculated from RC network and connected to external of 555 timer
Stable when the output logic LOW (logic = 0)
When a pulse is trigger at pin 2 (normally negative trigger pulse), timer output will change to HIGH (+Vs) for a while and change to LOW (stable condition). The condition will continue LOW until pulse is trigger again.
The timing period is triggered (started) when trigger input (555 pin 2) is less than 1/3 Vs, this makes the output high (+Vs) and the capacitor C1 starts to charge through resistor R1. Once the time period has started further trigger pulses are ignored.
The threshold input (555 pin 6) monitors the voltage across C1 and when this reaches 2/3 Vs the time period over and the output becomes LOW,
At the same time discharge (555 pin 7) is connected to 0V, discharging the capacitor ready for the next trigger.
8.Astable Mode
Astable multivibrators are also known as Free-running Multivibrator.
Astable do not need trigger pulse for external to change the output.
The period for LOW and HIGH can be calculated based on resistor and capacitor value that connected at outside of timer.
9.Applications
Schmitt trigger
PPM
PWM
Linear Ramp generator
Precision Timing
Pulse Generation
Time Delay Generation
Sequential Timing
Used as a quad timer
10. Conclusion
Hence 555 IC timer can produce very accurate and stable time delays, from microseconds to hours. It can be used with supply voltage varying from 5 to 18 V. Timer can be used in monostable mode of operation or astable mode of operation. Its various applications include waveform generator, missing pulse detector, frequency divider, pulse width modulator, burglar alarm, FSK generator, ramp generator, pulse position modulator etc.
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The 555 timer is a versatile integrated circuit that can be used to generate accurate timing signals. It works by using internal comparators and a flip-flop to accurately time an external resistor-capacitor circuit. The 555 timer can be used in various configurations (monostable, bistable, astable) to generate pulses or oscillations for applications like timers, flashing lights, and tone generation. It is an inexpensive and robust chip contained in an 8-pin package that can drive loads directly from its output.
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The 555 timer IC is a versatile integrated circuit that is commonly used to generate accurate time delays or oscillations. It operates on voltages between 5-18V and can source or sink 200mA of current. The 555 timer contains 25 transistors, 2 diodes, and 15 resistors on a silicon chip in an 8-pin package. It has three operating modes - astable, monostable, and bistable - and can be used for applications like timers, pulse generation, and flip-flops. The name '555' comes from the three 5kΩ resistors inside the chip.
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Ic 555
1.Introduction
The 555 IC was designed in 1971 by Hans Camenzind under contract to SigNetics Corporation.
555 timer is a highly stable circuit used to generate time delays, or Oscillations.
A single 555 timer can provide time delay ranging from microseconds to hours.
It operates from a wide range of power supplies ranging from + 5 Volts to + 18 Volts supply voltage.
2.Pin Configuration
3.Working of Pin
4.555 Integral circuit
5.Operating modes of IC
6. Bistable Mode
In bistable (also called Schmitt trigger) mode, the 555 timer acts as a basic flip-flop.
The trigger and reset inputs (pins 2 and 4 respectively on a 555) are held high via pull-up resistors while the threshold input (pin 6) is simply floating.
Thus configured, pulling the trigger momentarily to ground acts as a 'set' and transitions the output pin (pin 3) to Vcc (high state).
Pulling the reset input to ground acts as a 'reset' and transitions the output pin to ground (low state). No timing capacitors
Pin 5 (control voltage) is connected to ground via a small-value capacitor (usually 0.01 to 0.1 μF). Pin 7 (discharge) is left floating
7.Monostable Mode
Pulse generator circuit which the period is calculated from RC network and connected to external of 555 timer
Stable when the output logic LOW (logic = 0)
When a pulse is trigger at pin 2 (normally negative trigger pulse), timer output will change to HIGH (+Vs) for a while and change to LOW (stable condition). The condition will continue LOW until pulse is trigger again.
The timing period is triggered (started) when trigger input (555 pin 2) is less than 1/3 Vs, this makes the output high (+Vs) and the capacitor C1 starts to charge through resistor R1. Once the time period has started further trigger pulses are ignored.
The threshold input (555 pin 6) monitors the voltage across C1 and when this reaches 2/3 Vs the time period over and the output becomes LOW,
At the same time discharge (555 pin 7) is connected to 0V, discharging the capacitor ready for the next trigger.
8.Astable Mode
Astable multivibrators are also known as Free-running Multivibrator.
Astable do not need trigger pulse for external to change the output.
The period for LOW and HIGH can be calculated based on resistor and capacitor value that connected at outside of timer.
9.Applications
Schmitt trigger
PPM
PWM
Linear Ramp generator
Precision Timing
Pulse Generation
Time Delay Generation
Sequential Timing
Used as a quad timer
10. Conclusion
Hence 555 IC timer can produce very accurate and stable time delays, from microseconds to hours. It can be used with supply voltage varying from 5 to 18 V. Timer can be used in monostable mode of operation or astable mode of operation. Its various applications include waveform generator, missing pulse detector, frequency divider, pulse width modulator, burglar alarm, FSK generator, ramp generator, pulse position modulator etc.
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The document describes the 555 timer integrated circuit and its applications, including using it in a
monostable circuit to debounce switches, in an astable circuit to create pulse trains, and to modulate an
infrared transmitter and receiver circuit by generating a 38 kHz pulse train to transmit data over infrared light.
It provides details on the pins and functions of the 555 timer, equations to calculate pulse lengths for the
monostable and astable circuits, and examples of uses for each type of 555 timer circuit configuration.
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The 555 timer is widely used as IC timer circuit and it is the most commonly used general purpose linear integrated circuit. It can run in either one of the two modes: Monostable (one stable state) or Astable (no stable state). In the Monostable mode it can produce accurate time delays from microseconds to hours. In the Astable mode it can produce rectangular waveforms with a variable Duty cycle. The simplicity and ease with which both the multivibrator circuits can be configured around this IC is one of the main reasons for its wide use. The state of the art presented in the paper is the design and implementation of an Astable multivibrator using 555 timer IC, generating non-sinusoidal waveform in the form of Rectangular waveform as well as capacitor voltage waveform in the form of ramp waveform.
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IC 555.pptx
- 1. The IC 555 is an 8-pin Integrated Circuit (IC) that is capable of producing accurate time delays and/or oscillations. DIP chip (Dual-Inline package) IC 555 timer
- 2. IC 555 2 Control Voltage (5) Trigger Voltage (2) Ground (1) Vcc (8) Discharge (7) Reset (4) Output (3) - + - + RESET SET Q Q Comparator 1 Comparator 2 Flip-Flop T1 2 Threshold Voltage (6) 5 kΩ 5 kΩ 5 kΩ
- 3. 555 Timer Operating Modes The 555 has three main operating modes, Monostable, Astable, and Bistable. Each mode represents a different type of circuit that has a particular output.
- 4. Astable mode An Astable Circuit has no stable state - hence the name "astable". The output continually switches state between high and low without without any intervention from the user, called a 'square' wave. This type of circuit could be used to give a mechanism intermittent motion by switching a motor on and off at regular intervals. It can also be used to flash lamps and LEDs, and is useful as a 'clock' pulse for other digital ICs and circuits.
- 5. Monostable mode A Monostable Circuit produces one pulse of a set length in response to a trigger input such as a push button. The output of the circuit stays in the low state until there is a trigger input, hence the name "monostable" meaning "one stable state". his type of circuit is ideal for use in a "push to operate" system for a model displayed at exhibitions. A visitor can push a button to start a model's mechanism moving, and the mechanism will automatically switch off after a set time.
- 6. Bistable Mode (or Schmitt Trigger) A Bistable Mode or what is sometimes called a Schmitt Trigger, has two stable states, high and low. Taking the Trigger input low makes the output of the circuit go into the high state. Taking the Reset input low makes the output of the circuit go into the low state. This type of circuit is ideal for use in an automated model railway system where the train is required to run back and forth over the same piece of track. A push button (or reed switch with a magnet on the underside of the train) would be placed at each end of the track so that when one is hit by the train, it will either trigger or reset the bistable. The output of the 555 would control a DPDT relay which would be wired as a reversing switch to reverse the direction of current to the track, thereby reversing the direction of the train
- 7. Time Delay Mode • In the time delay mode, the delay is controlled by one external resistor and capacitor. Example: Turn a light on in a delayed amount of time. (Just turn on or off once) Oscillator Mode • In the oscillator mode, the frequency of oscillation are controlled with two external resistors and one capacitor. Example: Can make a light flash a specific rate. (Can turn on and off repeatedly)
- 8. IC 555 timer Oscillator mode = astable multivibrator mode Translation: in this mode the IC 555 will continue to put out pulses until you remove the battery. (your choice of resistors and capacitors determines the vibration frequency) The 555 timer is a two state device: HI and LO You can be a two state device too……
- 9. IC 555 timer Astable multivibrator mode schematic Notice: 2 resistors and 1 capacitor OUTPUT is square wave pulses LESSON 15 “How the 555 Timer Works”
- 10. Period The Period is the total time of an on/off cycle and depends on the values of RA, RB, and C C 2 693 . 0 693 . 0 693 . 0 693 . 0 693 . 0 B A B B A LOW HIGH B LOW B A HIGH R R T C R C R R T t t T C R t C R R t
- 11. Frequency The frequency of an oscillation (or anything that exhibits a repeating pattern) is inversely proportional to the period C R 2 R 693 . 0 1 F T 1 F B A Unit of Measure: cycles/second = Hertz (Hz)
- 12. Solution R1=390Ჲ , R2=180 Ჲ, C=6.8uF Period mSec 534 . 3 T F 8 . 6 180 2 390 693 . 0 T C R 2 R 693 . 0 T B A Frequency Hz 282.941 F mSec 534 . 3 1 F T 1 F
- 13. Key Points The 555 timer works with 2 resistors (one of which is temperature dependent) and 1 capacitor to establish an oscillation in the circuit. The 555 timer output has two modes: ON and OFF and it turns whatever device it is connected to ON and OFF at a rate that depends on the changing resistance of the thermistor (which depends on temperature)!!!
- 15. A555 mono stable circuit R=10K C=5uf
- 17. Applications of 555 Timer 555 timer is most important integrated circuit (chip) used widely in digital electronics. Some common uses and application of 555 timer IC are as follow: • PWM (Pulse Width Modulation) & PPM (Pulse Position Modulation) • Duty Cycle Oscillator • Lamp Dimmer • To provide Accurate time delays • As a flip-flop element • Digital logic probes • Analog frequency meters • Quad Timer applications • Pulse, Waveform, and square wave generation
- 18. • Stepped tone & tone burst generator & linear ramp generation • Tachometers & temperature measurement • It can be used as monostable multivibrator and astable multivibrator • DC to DC Converters • DC Voltage Regulators • Voltage to Frequency Converter • Frequency Divider • Schmitt trigger • Cable tester • Pulse detector • Wiper speed control • Timer Switch • Time delay generation, precision timing and sequential timing