Timer Circuits

Timer circuits are used to control sequences of events in electronic systems. They work by changing the circuit from one state to another in advance. 


Applications for timer circuits

You can use timer circuits for basic timing functions, like turning a light on for a certain amount of time or creating a flashing light. They can also be used to create musical notes of a particular frequency.


555 timers

The most widespread type of timer circuit is the 555 timer, which is made up of an eight-pin dual in-line package containing 25 transistors, two diodes and 16 resistors. They can be used as either astable or monostable timers: 

  • Monostable: Often called a one-shot timer, a monostable timer stays on for a certain length of time and then turns off. The timing process starts when the timer is switched on.
  • Astable: An astable timer is switched on to provide a constant on/off digital output. The timer can be used make an LED flash, and the rate of flashing is determined by a capacitor in the circuit.

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Beskrivning Pris Mounting Type Timer Type Package Type Number of Internal Timers Pin Count Maximum Input Frequency Minimum Operating Supply Voltage Maximum Operating Supply Voltage Minimum Operating Temperature Maximum Operating Temperature Maximum Quiescent Current Maximum Low Level Output Current Maximum High Level Output Current Maximum Propagation Delay Time @ Maximum CL
RS-artikelnummer 921-5507
Tillv. art.nrICM7555IBAZ
5,886 kr
Each (In a Pack of 25)
Enheter
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-artikelnummer 921-5374
Tillv. art.nrICM7555IPAZ
5,273 kr
Each (In a Pack of 10)
Enheter
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-artikelnummer 170-8173
Tillv. art.nrICM7555IPAZ
4,56 kr
Each (In a Tube of 50)
Enheter
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-artikelnummer 921-5951
Tillv. art.nrICM7242IPAZ
20,445 kr
Each (In a Pack of 2)
Enheter
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS-artikelnummer 921-5595
Tillv. art.nrCS82C54Z
94,82 kr
Each
Enheter
Surface Mount Programmable PLCC 1 28 8MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 150 ns @ 5 V
RS-artikelnummer 921-5652
Tillv. art.nrCS82C54-10Z96
108,05 kr
Each
Enheter
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS-artikelnummer 146-2399
Tillv. art.nrICM7556IPDZ
6,072 kr
Each (In a Tube of 25)
Enheter
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-artikelnummer 923-1477
Tillv. art.nrCS82C54-10Z96
65,055 kr
Each (On a Reel of 750)
Enheter
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS-artikelnummer 923-1470
Tillv. art.nrIS82C54-10Z
188,884 kr
Each (In a Tube of 37)
Enheter
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS-artikelnummer 921-5677
Tillv. art.nrIS82C54-10Z
214,45 kr
Each
Enheter
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS-artikelnummer 921-5377
Tillv. art.nrICM7556IPDZ
6,408 kr
Each (In a Pack of 5)
Enheter
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-artikelnummer 923-1405
Tillv. art.nrIS82C54Z
155,494 kr
Each (In a Tube of 37)
Enheter
Surface Mount Programmable PLCC 1 28 8MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 150 ns @ 5 V
RS-artikelnummer 921-5541
Tillv. art.nrIS82C54Z
176,40 kr
Each
Enheter
Surface Mount Programmable PLCC 1 28 8MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 150 ns @ 5 V
RS-artikelnummer 923-1571
Tillv. art.nrICM7242IPAZ
20,844 kr
Each (In a Tube of 50)
Enheter
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS-artikelnummer 921-5582
Tillv. art.nrCS82C54-10Z
104,85 kr
Each
Enheter
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V