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Part Number : NE555

Function : Single Timer

Package : 8 Pin DIP or SOP

Manufacturers : Fairchild Semiconductor

Pinouts :

Description :

The LE555 is a highly stable controller capable of producing accurate timing pulses. With a monostable operation, the delay is controlled by one external resistor and one capacitor. With astable operation, the frequency and duty cycle are accurately controlled by two external resistors and one capacitor.

The LM555 is a highly stable controller capable of producing accurate timing pulses. Wiki 555 Info

Features

1. High Current Drive Capability (200mA)
2. Adjustable Duty Cycle
3. Temperature Stability of 0.005%/°C
4. Timing From µSec to Hours
5. Turn off Time Less Than 2µSec

Applications

1. Precision Timing
2. Pulse Generation
3. Time Delay Generation
4. Sequential Timing

Other data sheets within the file : 555, LM555, LM555CM, LM555CMX, LM555CN

NE555 Datasheet PDF Download

Part Number : LM555

Function : Single Timer

Package : 8-DIP, 8-SOIC

Manufactuers : Fairchild

Image

Description :

This LM555 Timer is a highly stable controller capable of producing accurate timing pulses. With a monostable operation, the delay is controlled by one external resistor and one capacitor.

With astable operation, the frequency and duty cycle are accurately controlled by two external resistors and one capacitor.

Features

1. High-Current Drive Capability: 200 mA
2. Adjustable Duty Cycle
3. Temperature Stability of 0.005%/°C
4. Timing From μs to Hours
5. Turn off Time Less Than 2 μs

Ordering Information

LM555 Ordering Information

Application Information

When the low signal input is applied to the reset terminal, the timer output remains low regardless of the threshold voltage or the trigger voltage. Only when the high signal is applied to the reset terminal, the timer’s output changes according to threshold voltage and trigger voltage.
When the threshold voltage exceeds 2/3 of the supply voltage while the timer output is high, the timer’s internal discharge transistor turns on, lowering the threshold voltage to below 1/3 of the supply voltage. During this time, the timer output is maintained low. Later, if a low signal is applied to the trigger voltage so that it becomes 1/3 of the supply voltage, the timer’s internal discharge transistor turns off, increasing the threshold voltage and driving the timer output again at high.

Block Diagram