The LM556 is a dual timer IC, similar to 555 Timer IC but here it has two such timer devices into a single package. It is considered to be the modern replacement for 555 since it uses the latest CMOS technology.
NE555 Timer IC has an operating voltage from +5V to +18V and the output pin can source/sink up to 150mA current. The minimum threshold voltage for the trigger pin is 2.4V when operated with 5V.
Pin configuration
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Pin Number
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Pin Name
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Description
|
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1,13
|
Discharge
|
Open collector output which discharges a capacitor.
|
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2,12
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Threshold
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Compares the voltage applied to the terminal with a reference voltage.
|
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3,11
|
Control Voltage
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Controls the threshold and trigger levels.
|
|
4,10
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Reset
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A negative pulse applied to this pin to disable or reset the timer.
|
|
5,9
|
Out
|
Normally connected to load
|
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6,8
|
Trigger
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Responsible for the transition of the flip-flop from set to reset.
|
|
7
|
Ground
|
Ground Pin
|
|
14
|
Vcc
|
Supply Voltage Pin
|
Features & Specifications
- Two precision Timers in one single package
- Operating Voltage Range: 5V to 18V.
- The source/sink current of the output pin is 150mA
- Supply Current: 10mA
- Operating Temperature: 0 to 70°C
- Active Pullup or Pulldown
- Designed to Be Interchangeable With Signetics NE556, SA556, and SE556
- Available in 14-pin SOIC, and MDIP packages
Package Contents
1× LM556/NE556 Dual Timer IC
Additional Resources
LM556 Datasheet
