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LM555 Timer: Pinout, Datasheet, Circuit

Q: How many pins does lm555 have?

Here is the arrangement of the eight pins in a standard 555 IC. The 555 comes in an 8-pin DIP package. Here are the functions of each of the eight pins: Ground: Pin 1 is connected to ground.

Q: What is lm555 monostable mode?

In monostable mode, the lm555 timer outputs a single pulse of current for a certain length of time. This is sometimes referred to as a one-shot pulse. An example of this can be seen with an LED and a push-button.

Q: What does lm555 IC do?

The lm555 timer is a very popular and useful precision timing device which can act as either a simple timer to generate single pulses or long time delays, or as a relaxation oscillator producing a string of stabilised waveforms of varying duty cycles from 50 to 100%.

Q: What is the maximum supply voltage for a lm555?

The maximum supply voltage for a lm555 is 16V.

Q: Are all 555 timers the same?

Due to minor variations in process, the CMOS chips can have variations in performances and speeds, but mostly they are interchangeable with each other, just like a standard 555 is usually interchangeable between manufacturers.

Q: How does the lm555 time delay controller work?

The LM555/NE555/SA555 is a highly stable controller capable of producing accurate timing pulses. With the monostable operation, the time delay is controlled by one external resistor and one capacitor. With a stable operation, the frequency and duty cycle are accurately controlled with two external resistors and one capacitor.

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Published: 31 July 2021 | Last Updated: 31 July 2021

6556

LM555CM

Texas Instruments

5V 555 Type, Timer/Oscillator (Single) Programmable Timers LM555 8 Pins 100kHz 5V 8-SOIC (0.154, 3.90mm Width)

Purchase Guide

5V 555 Type, Timer/Oscillator (Single) Programmable Timers LM555 8 Pins 100kHz 5V 8-SOIC (0.154, 3.90mm Width)

The LM555 is a highly stable device for generating accurate time delays or oscillation. This article covers its pinout, datasheet and more details about LM555. There is a huge range of Semiconductors, Capacitors, Resistors and ICs in stock. Welcome RFQ.

The 555 timer is probably the most common and popular IC to be used in hobby circuits.

How 555 timers Work - The Learning Circuit

Catalog

LM555 Description

The LM555 is a highly stable device for generating accurate time delays or oscillation. It operates in 2 modes: monostable mode and astable mode. In monostable mode, the time is precisely controlled by one external resistor and capacitor; For astable operation as an oscillator, the free-running frequency and duty cycle are accurately controlled with two external resistors and one capacitor.

LM555 Pinout

LM555 Pinout.jpg

LM555 Pinout

LM555 CAD Model

Symbol

LM555 Symbol.jpg

LM555 Symbol

Footprint

LM555 Footprint.jpg

LM555 Footprint

3D Model

LM555 3D Model.jpg

LM555 3D Model

LM555 Features

Timing from microseconds through hours
Operates in both astable and monostable modes
Adjustable duty cycle
Output can source or sink 200 mA
Output and supply TTL compatible
Temperature stability better than 0.005% per ˚C
Normally on and normally off output
Available in 8-pin MSOP package

LM555 Applicaiton

Precision timing
Pulse generation
Sequential timing
Time delay generation
Pulse width modulation
Pulse position modulation
Linear ramp generator

LM555 Functional Block Diagram

LM555 Schematic Diagram.jpg

LM555 Functional Block Diagram

Specification

LM555 Equivalent

The equivalent for LM555:

LM556
SE555
NE555

Parts with Similar Specs

The three parts on the right have similar specifications to Texas Instruments & LM555CM.

Image
Part Number
Manufacturer
Package / Case
Number of Pins
Quiescent Current
Low Level Output Current
Frequency
Supply Voltage
Moisture Sensitivity Level (MSL)
Operating Supply Current
View Compare
LM555CM
Texas Instruments
8-SOIC (0.154, 3.90mm Width)
8
3 mA
200 mA
100kHz
5 V
1 (Unlimited)
10 mA
MC1455BDR2G
ON Semiconductor
8-SOIC (0.154, 3.90mm Width)
8
15 mA
200 mA
-
5 V
1 (Unlimited)
10 mA
LM555CM
VS
MC1455BDR2G
LM555CMX
Texas Instruments
8-SOIC (0.154, 3.90mm Width)
8
3 mA
200 mA
100kHz
5 V
1 (Unlimited)
10 mA
LM555CM
VS
LM555CMX
LM555CMX/NOPB
Texas Instruments
8-SOIC (0.154, 3.90mm Width)
8
3 mA
200 mA
100kHz
5 V
1 (Unlimited)
10 mA
LM555CM
VS
LM555CMX/NOPB
LM555CM/NOPB
Texas Instruments
8-SOIC (0.154, 3.90mm Width)
8
3 mA
200 mA
100kHz
5 V
1 (Unlimited)
10 mA
LM555CM
VS
LM555CM/NOPB

How to use LM555?

The timer is the most commonly used for Precision timing and Pulse generation applications, so does LM555 Timer. It can adapt itself to various applications due to its different operating modes. We can see the circuits for monostable and astable operations as shown below.

LM555 Monastable.jpg

LM555 Monastable

In monastable mode of operation, the timer functions as a one-shot (circuit above). The external capacitor is initially held discharged by a transistor inside the timer. Upon application of a negative trigger pulse of less than 1/3 VCC to pin 2, the flip-flop is set which both releases the short circuit across the capacitor and drives the output high.

LM555 Astable

In astable mode of operation, the capacitor charges and discharges between 1/3 VCC and 2/3 VCC. As in the triggered mode, the charge and discharge times, and therefore the frequency are independent of the supply voltage.

LM555 Dimensions

LM555 Dimensions

LM555 Manufacturer

Texas Instruments focus on developing analogue chips and embedded processors, which account for more than 80% of its revenue, Texas Instruments emerged in 1951 after a reorganization of Geophysical Service Incorporated, a company founded in 1930 that manufactured equipment for use in the seismic industry, as well as defence electronics.

Datasheet PDF

Download datasheets and manufacturer documentation for Texas Instruments LM555CM.

Datasheets :
LM555CM-Texas-Instruments-datasheet-21221892.pdf
LM555CM-Texas-Instruments-datasheet-10617826.pdf
LM555CM-National-Semiconductor-datasheet-34116.pdf
LM555CM-National-Semiconductor-datasheet-39613.pdf
PCN Assembly/Origin :
Mult Devices 21/Aug/2017

Popularity by Region

Frequently Asked Questions

How many pins does lm555 have?

Here is the arrangement of the eight pins in a standard 555 IC. The 555 comes in an 8-pin DIP package. Here are the functions of each of the eight pins: Ground: Pin 1 is connected to ground.

What is lm555 monostable mode?

In monostable mode, the lm555 timer outputs a single pulse of current for a certain length of time. This is sometimes referred to as a one-shot pulse. An example of this can be seen with an LED and a push-button.

What does lm555 IC do?

The lm555 timer is a very popular and useful precision timing device which can act as either a simple timer to generate single pulses or long time delays, or as a relaxation oscillator producing a string of stabilised waveforms of varying duty cycles from 50 to 100%.

What is LM555?

The LM555 is a highly stable device for generating accurate time delays or oscillation. It operates in 2 modes: monostable mode and astable mode. In monostable mode, the time is precisely controlled by one external resistor and capacitor; For astable operation as an oscillator, the free-running frequency and duty cycle are accurately controlled with two external resistors and one capacitor.

What is the maximum supply voltage for a lm555?

 The maximum supply voltage for a lm555 is 16V.

Are all 555 timers the same?

Due to minor variations in process, the CMOS chips can have variations in performances and speeds, but mostly they are interchangeable with each other, just like a standard 555 is usually interchangeable between manufacturers.

How does the lm555 time delay controller work?

The LM555/NE555/SA555 is a highly stable controller capable of producing accurate timing pulses. With the monostable operation, the time delay is controlled by one external resistor and one capacitor. With a stable operation, the frequency and duty cycle are accurately controlled with two external resistors and one capacitor.

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LM555CM

Texas Instruments

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