LM556/NE556 Dual Timer IC - 16 Pin DIP Package

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