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
|
Pin Number |
Pin Name |
Description |
|
1,13 |
Discharge |
Open collector output which discharges a capacitor. |
|
2,12 |
Threshold |
Compares the voltage applied to the terminal with a reference voltage. |
|
3,11 |
Control Voltage |
Controls the threshold and trigger levels. |
|
4,10 |
Reset |
A negative pulse applied to this pin to disable or reset the timer. |
|
5,9 |
Out |
Normally connected to load |
|
6,8 |
Trigger |
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
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