What is LM555 Timer IC?

This is a popular integrated circuit chip used in a variety of electronic applications, primarily for timing and oscillator functions. It was first introduced by National Semiconductor (now part of Texas Instruments) in the 1970s.

Part Number: LM555CN, LM555P

Function: Timer(Direct Replacement for SE555/NE555)

Package: SOIC, PDIP, VSSOP 8 Pin type

Manufacturer: Texas Instruments , Fairchild

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Description

The LM555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output circuit can source or sink up to 200 mA or drive TTL circuits.

The LM555 timer can be used a various configurations, but the most commonly used configuration is in monostable mode. A typical application for the LM555 timer in monostable mode is to turn on an LED for a specific time duration. A pushbutton is used as the trigger to output a high pulse when trigger pin is pulsed low. This simple application can be modified to fit any application requirement.

Pinouts

Features

• Wide supply voltage range: 4.5V to 16V
• Output current up to 200mA (sink or source)
• Adjustable duty cycle with external resistors and capacitors
• Low trigger and reset input currents for better noise immunity
• Temperature stability better than 50ppm/°C
• Operates in monostable, astable, and bistable modes
• TTL and CMOS compatible output
• Available in 8-pin DIP and SOIC packages

 

Specifications

1. Timing and oscillator functions: Primarily used for timing and oscillator functions, such as generating clock signals, pulse-width modulation (PWM), and oscillation circuits.

2. Low power consumption: It is designed to operate with a low power consumption, making it suitable for use in battery-powered devices.

3. Wide operating voltage range: It has a wide operating voltage range of 4.5V to 16V, making it suitable for use in a variety of electronic devices.

4. Single timer integrated circuit chip that contains a voltage comparator, a flip-flop, and a discharge transistor.

5. It can provide either a digital output (0 or 1) or an analog output, depending on the application.

Overall, LM555 is a versatile and widely used integrated circuit chip that offers a low-cost, low-power solution for timing and oscillator applications.

Applications

• Monostable pulse generation and delay circuits
• Astable oscillators and clock pulse generators
• Pulse width modulation (PWM) control
• Frequency and duty cycle generators
• Light and sound control circuits

Alternative / Equivalent Products

• NE555 (Signetics / Philips)
• SE555 (Military temperature range version)
• TLC555 (CMOS low-power version by Texas Instruments)
• NA555 (Fairchild equivalent)
• KA555 (Samsung / Fairchild compatible version)

 

Other data sheets are available within the file:

555CM, 555CN, LM555CM, LM555CM-NOPB

 

LM555 Datasheet