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NE556

Dual Timer

Fairchild Semiconductor 

LM556/NE556

Dual Timer

www.fairchildsemi.com

Features

• Replaces Two LM555/NE556 Timers

• Operates in Both Astable And Monostable Modes

• High Output Current

• TTL Compatible

• Timing From Microsecond To Hours

• Adjustable Duty Cycle

• Temperature Stability Of 0.005% Per °C

Applications

• Precision Timing

• Pulse Shaping

• Pulse Width Modulation

• Frequency Division

• Traffic Light Control

• Sequential Timing

• Pulse Generator

• Time Delay Generator

• Touch Tone Encoder

• Tone Burst Generator

Internal Block Diagram

Description

The LM556/NE556 series dual monolithic timing circuits

are a highly stable controller capable of producing accurate

time delays or oscillation. The LM556/NE556 is a dual

LM555. Timing is provided an external resistor and capaci-

tor for each timing function. The two timers operate inde-

pendently of each other, sharing only VCC and ground. The

circuits may be triggered and reset on falling waveforms.

The output structures may sink or source 200mA.

14-DIP

14-SOP

1

1

©2001 Fairchild Semiconductor Corporation

Rev. 1.0.0

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