Timer Circuits

Timer circuits are used to control one or more sequences of events within an electronic system. Timer circuits work by changing the circuit from its current state to another in advance following a set parameter.

Where would I use a timer circuit?

You can use timer circuits for a wide range of basic timing functions, like turning a light on for a certain amount of time or on and off repeatedly within a set time to create a flashing light or lighting sequence. Timer circuits 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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Omschrijving Prijs 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-stocknr. 921-5377
FabrikantnummerICM7556IPDZ
1,72 €
Each (In a Pack of 5)
Aantal stuks
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-stocknr. 921-5582
FabrikantnummerCS82C54-10Z
10,83 €
Each
Aantal stuks
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-stocknr. 921-5652
FabrikantnummerCS82C54-10Z96
10,00 €
Each
Aantal stuks
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-stocknr. 170-8173
FabrikantnummerICM7555IPAZ
0,713 €
Each (In a Tube of 50)
Aantal stuks
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-stocknr. 923-1477
FabrikantnummerCS82C54-10Z96
6,909 €
Each (On a Reel of 750)
Aantal stuks
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-stocknr. 146-2399
FabrikantnummerICM7556IPDZ
1,299 €
Each (In a Tube of 25)
Aantal stuks
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-stocknr. 921-5374
FabrikantnummerICM7555IPAZ
0,72 €
Each (In a Pack of 10)
Aantal stuks
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-stocknr. 921-5541
FabrikantnummerIS82C54Z
17,52 €
Each
Aantal stuks
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-stocknr. 923-1571
FabrikantnummerICM7242IPAZ
4,11 €
Each (In a Tube of 50)
Aantal stuks
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS-stocknr. 921-5677
FabrikantnummerIS82C54-10Z
12,92 €
Each
Aantal stuks
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-stocknr. 921-5951
FabrikantnummerICM7242IPAZ
4,84 €
Each (In a Pack of 2)
Aantal stuks
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS-stocknr. 921-5595
FabrikantnummerCS82C54Z
10,09 €
Each
Aantal stuks
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-stocknr. 923-1470
FabrikantnummerIS82C54-10Z
12,709 €
Each (In a Tube of 37)
Aantal stuks
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-stocknr. 196-8889
FabrikantnummerICM7555IBAZ-T
0,237 €
Each (On a Reel of 2500)
Aantal stuks
- Standard SOIC 1 8 1MHz - - - - - - - -
RS-stocknr. 921-5507
FabrikantnummerICM7555IBAZ
0,622 €
Each (In a Pack of 25)
Aantal stuks
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-stocknr. 196-8888
FabrikantnummerICM7555CBAZ-T
0,51 €
Each (In a Pack of 25)
Aantal stuks
- Standard SOIC 1 8 1MHz - - - - - - - -
RS-stocknr. 923-1405
FabrikantnummerIS82C54Z
15,44 €
Each (In a Tube of 37)
Aantal stuks
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-stocknr. 196-8887
FabrikantnummerICM7555CBAZ-T
0,221 €
Each (On a Reel of 2500)
Aantal stuks
- Standard SOIC 1 8 1MHz - - - - - - - -
RS-stocknr. 196-8891
FabrikantnummerICM7555IBAZ-T
0,51 €
Each (In a Pack of 25)
Aantal stuks
- Standard SOIC 1 8 1MHz - - - - - - - -