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 921-5582
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 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 170-8196
製造零件編號CS82C54-10Z
BrandIntersil
HK$90.009
毎管:37 個
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 178-4795
製造零件編號MC14541BDG
HK$2.64
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
RS庫存編號 534-3992
製造零件編號LMC555CM/NOPB
HK$16.71
單位
Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS庫存編號 162-7010
製造零件編號NE555PWR
HK$1.003
個 (在毎卷:2000)
單位
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS庫存編號 688-1543
製造零件編號MC14541BDR2G
HK$3.292
/個 (每包:5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
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 662-3999
製造零件編號NE555PWR
HK$2.177
/個 (每包:10個)
單位
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS庫存編號 518-9518
製造零件編號MC14541BDG
HK$9.74
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 121-8803
製造零件編號LMC555CM/NOPB
HK$7.604
毎管:95 個
單位
Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 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 923-6712
製造零件編號CD4541BEE4
HK$2.949
毎管:25 個
單位
Through Hole Programmable PDIP 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns @ 5 V
RS庫存編號 169-8718
製造零件編號LM555CN
HK$1.221
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 121-8804
製造零件編號LMC555CN/NOPB
HK$7.966
毎管:40 個
單位
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns @ 5 V
RS庫存編號 806-2835
製造零件編號LM555CN
HK$2.294
毎管:50 個
單位
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS庫存編號 620-0357
製造零件編號TLC555ID
HK$6.512
/個 (每包:10個)
單位
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
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 829-1516
製造零件編號STWD100YNPWY3F
HK$6.149
/個 (每包:10個)
單位
Surface Mount Watchdog SOT-23 1 5 - 2.7 V 5.5 V -40 °C +125 °C - - - -