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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Description Price 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 Stock No. 921-5582
Mfr. Part No.CS82C54-10Z
HK$98.83
Each
units
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 Stock No. 921-5652
Mfr. Part No.CS82C54-10Z96
HK$109.19
Each
units
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 Stock No. 923-1477
Mfr. Part No.CS82C54-10Z96
HK$85.85
Each (On a Reel of 750)
units
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 Stock No. 921-5377
Mfr. Part No.ICM7556IPDZ
HK$14.29
Each (In a Pack of 5)
units
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 146-2399
Mfr. Part No.ICM7556IPDZ
HK$12.17
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 170-8173
Mfr. Part No.ICM7555IPAZ
HK$6.321
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 921-5374
Mfr. Part No.ICM7555IPAZ
HK$6.881
Each (In a Pack of 10)
units
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 921-5507
Mfr. Part No.ICM7555IBAZ
HK$5.386
Each (In a Pack of 25)
units
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 923-1470
Mfr. Part No.IS82C54-10Z
HK$202.339
Each (In a Tube of 37)
units
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 Stock No. 196-8888
Mfr. Part No.ICM7555CBAZ-T
HK$5.302
Each (In a Pack of 25)
units
- Standard SOIC 1 8 1MHz - - - - - - - -
RS Stock No. 921-5951
Mfr. Part No.ICM7242IPAZ
HK$56.23
Each (In a Pack of 2)
units
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
New
RS Stock No. 217-7925
Mfr. Part No.8535AGI-31LF
HK$80.08
Each
units
Surface Mount - TSSOP - 20 40MHz - - - - - - - -
RS Stock No. 196-8889
Mfr. Part No.ICM7555IBAZ-T
HK$2.256
Each (On a Reel of 2500)
units
- Standard SOIC 1 8 1MHz - - - - - - - -
New
RS Stock No. 217-7924
Mfr. Part No.8535AGI-31LF
HK$63.344
Each (In a Tube of 74)
units
Surface Mount - TSSOP - 20 40MHz - - - - - - - -
RS Stock No. 921-5677
Mfr. Part No.IS82C54-10Z
HK$196.56
Each
units
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 Stock No. 923-1405
Mfr. Part No.IS82C54Z
HK$156.863
Each (In a Tube of 37)
units
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 Stock No. 921-5541
Mfr. Part No.IS82C54Z
HK$173.96
Each
units
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 Stock No. 196-8887
Mfr. Part No.ICM7555CBAZ-T
HK$2.594
Each (On a Reel of 2500)
units
- Standard SOIC 1 8 1MHz - - - - - - - -
RS Stock No. 923-1571
Mfr. Part No.ICM7242IPAZ
HK$44.846
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS Stock No. 921-5595
Mfr. Part No.CS82C54Z
HK$89.92
Each
units
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