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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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 923-1477
製造零件編號CS82C54-10Z96
HK$55.72
個 (在毎卷:750)
單位
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庫存編號 921-5652
製造零件編號CS82C54-10Z96
HK$109.00
單位
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庫存編號 921-5582
製造零件編號CS82C54-10Z
HK$105.65
單位
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庫存編號 146-2399
製造零件編號ICM7556IPDZ
HK$9.442
毎管:25 個
單位
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS庫存編號 921-5377
製造零件編號ICM7556IPDZ
HK$12.87
/個 (每包:5個)
單位
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS庫存編號 921-5374
製造零件編號ICM7555IPAZ
HK$5.16
/個 (每包:10個)
單位
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS庫存編號 170-8173
製造零件編號ICM7555IPAZ
HK$4.116
毎管:50 個
單位
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS庫存編號 921-5541
製造零件編號IS82C54Z
HK$116.18
單位
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庫存編號 921-5595
製造零件編號CS82C54Z
HK$86.31
單位
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庫存編號 923-1405
製造零件編號IS82C54Z
HK$117.788
毎管:37 個
單位
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庫存編號 921-5951
製造零件編號ICM7242IPAZ
HK$32.37
/個 (每包:2個)
單位
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS庫存編號 923-1571
製造零件編號ICM7242IPAZ
HK$29.462
毎管:50 個
單位
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS庫存編號 921-5677
製造零件編號IS82C54-10Z
HK$161.39
單位
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庫存編號 923-1470
製造零件編號IS82C54-10Z
HK$178.177
毎管:37 個
單位
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庫存編號 921-5507
製造零件編號ICM7555IBAZ
HK$4.345
/個 (每包:25個)
單位
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -