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庫存編號 169-8718
製造零件編號LM555CN
TWD7.50
個 (在毎卷:3000)
單位
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS庫存編號 145-4759
製造零件編號MC1455BDR2G
TWD6.80
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS庫存編號 787-8709
製造零件編號MC1455BDR2G
TWD15.40
/個 (每包:10個)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS庫存編號 518-9518
製造零件編號MC14541BDG
TWD17.00
單位
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns@ 5 V
RS庫存編號 787-8702
製造零件編號MC1455DG
TWD14.30
/個 (每包:14個)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS庫存編號 787-8706
製造零件編號MC1455DR2G
TWD13.00
/個 (每包:20個)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS庫存編號 166-2846
製造零件編號FT3001MPX
TWD8.80
個 (在毎卷:3000)
單位
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
RS庫存編號 162-9390
製造零件編號MC1455DR2G
TWD5.80
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS庫存編號 178-4795
製造零件編號MC14541BDG
TWD13.60
毎管:55 個
單位
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns @ 5 V