3.3 V Monostable Multivibrators

Reviewed by: Jon Lowy, consulting engineer

Description

A 3.3 V monostable multivibrator is an electronic circuit that generates a single output pulse of a specified duration in response to an external trigger signal. This pulse is characterized by its stable and reproducible width, which is determined by the circuit's components.

Working Principle

A monostable multivibrator, also known as a one-shot multivibrator, operates by switching from a stable state to a temporary unstable state when triggered by an external signal. The circuit remains in this unstable state for a predetermined period before returning to its stable state. This behavior is achieved through the use of components such as resistors and capacitors, which control the timing of the pulse. The usefulness of monostable multivibrators lies in their ability to produce precise timing pulses, which are essential in various timing and control applications.

Applications

Monostable multivibrators are widely used in applications where a single, precise timing pulse is required. Specific examples include:

Debouncing Switches: To eliminate noise and ensure a clean signal when a mechanical switch is pressed.
Pulse Width Modulation (PWM): For controlling the duration of pulses in PWM circuits.
Timers and Delay Circuits: In applications such as traffic light controls and burglar alarms, where precise timing is crucial.
Frequency Division: In digital circuits to divide the frequency of an input signal.

Advantages over other Monostable Multivibrators

3.3 V monostable multivibrators offer several advantages over their counterparts operating at different voltages:

Compatibility with Modern Logic Levels: Many modern digital circuits operate at 3.3 V, making these multivibrators compatible without the need for level shifting.
Lower Power Consumption: Operating at a lower voltage reduces power consumption, which is beneficial in battery-operated devices.
Reduced Heat Generation: Lower voltage operation typically results in less heat dissipation, enhancing the reliability and longevity of the circuit.

Limitations

Despite their advantages, 3.3 V monostable multivibrators have some limitations:

Limited Voltage Range: They may not be suitable for applications requiring higher voltage levels.
Sensitivity to Noise: Lower voltage levels can make the circuit more susceptible to noise, potentially affecting performance.
Component Tolerances: The accuracy of the output pulse duration can be affected by the tolerances of the resistors and capacitors used in the circuit.

Considerations

When designing or selecting a 3.3 V monostable multivibrator, several factors should be considered:

Initial Costs: The cost of components such as resistors, capacitors, and the multivibrator IC itself.
Operating Expense: Lower power consumption can reduce operating costs, especially in battery-powered applications.
Durability: The choice of high-quality components can enhance the durability and reliability of the circuit.
Accuracy: Precision components with tight tolerances are essential for achieving accurate pulse durations.
Replacement and Maintenance Costs: Consider the ease of replacing components and the potential need for recalibration over time.

21 Results

Dual retriggerable monostable multivibrator with reset -- 74AHC123ABQ,115 - Image

View Datasheet

Dual retriggerable monostable multivibrator with reset -- 74AHC123ABQ,115
from Nexperia B.V.

The 74AHC123A; 74AHCT123A is a dual retriggerable monostable multivibrator with reset. The basic output pulse width is programmed by selection of external components (REXT and CEXT). Once triggered this basic pulse width may be extended by retriggering either of the edge triggered inputs (nA or... [See More]

Supply Voltage: 2.5V; 3V; 3.3V; 3.6V; 5V; 2.0 - 5.5
Features: Master Reset; ESD Protection

Type: Retriggerable
Package Type: Other; SOT763-1

CD74HC123 High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset -- CD74HC123E - Image

View Datasheet

CD74HC123 High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset -- CD74HC123E
from Texas Instruments

High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset 16-PDIP -55 to 125 [See More]

Supply Voltage: 3.3V; 5V; 2
Package Type: Other; PDIP,SO,SOIC,TSSOP

Type: Retriggerable
Logic Family: HC

Dual retriggerable monostable multivibrator with reset -- 74AHC123AD,112 - Image

View Datasheet

Dual retriggerable monostable multivibrator with reset -- 74AHC123AD,112
from Nexperia B.V.

Supply Voltage: 2.5V; 3V; 3.3V; 3.6V; 5V; 2.0 - 5.5
Features: Master Reset; ESD Protection

Type: Retriggerable
Package Type: Other; SO16 (SOT109-1)

CD74HC221 High Speed CMOS Logic Dual Monostable Multivibrators with Reset -- CD74HC221-W - Image

View Datasheet

CD74HC221 High Speed CMOS Logic Dual Monostable Multivibrators with Reset -- CD74HC221-W
from Texas Instruments

High Speed CMOS Logic Dual Monostable Multivibrators with Reset 0-WAFERSALE [See More]

Supply Voltage: 3.3V; 5V; 2
Logic Family: HC

Package Type: Other; PDIP,SO,SOIC,TSSOP,WAFERSALE
Propagation Delay: 45

Dual retriggerable monostable multivibrator with reset -- 74AHC123APW,112 - Image

View Datasheet

Dual retriggerable monostable multivibrator with reset -- 74AHC123APW,112
from Nexperia B.V.

Supply Voltage: 2.5V; 3V; 3.3V; 3.6V; 5V; 2.0 - 5.5
Features: Master Reset; ESD Protection

Type: Retriggerable
Package Type: Other; SOT403-1

CD74HC423 High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset -- CD74HC423E - Image

View Datasheet

CD74HC423 High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset -- CD74HC423E
from Texas Instruments

High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset 16-PDIP -55 to 125 [See More]

Supply Voltage: 3.3V; 5V; 2
Package Type: Other; PDIP,SO,SOIC,TSSOP

Type: Retriggerable
Logic Family: HC

Single retriggerable monostable multivibrator; Schmitt trigger inputs -- 74LVC1G123DC,125 - Image

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Single retriggerable monostable multivibrator; Schmitt trigger inputs -- 74LVC1G123DC,125
from Nexperia B.V.

The 74LVC1G123 is a single retriggerable monostable multivibrator with Schmitt trigger inputs. Output pulse width is controlled by three methods: The basic pulse is programmed by selection of an external resistor (REXT) and capacitor (CEXT). Once triggered, the basic output pulse width may be... [See More]

Supply Voltage: 1.8V; 2.5V; 3V; 3.3V; 3.6V; 5V; 1.65 - 5.5
Features: Schmitt Trigger; ESD Protection