What is Timer IC?

Timer IC (Integrated Circuit) is an electronic component that is designed to generate precise timing signals. The most common types of Timer ICs are 555 timer and 556 timer. The 555 timer is a popular timer IC used for simple timing applications such as flashing lights, generating a square wave, and controlling the frequency of oscillators. The 556 timer is a dual version of the 555 timer that contains two 555 timers in a single package.

Part Number: NE555

Function: Single Timer

Package: 8 Pin DIP or SOP

Manufacturer: Fairchild Semiconductor

Fairchild Semiconductor Corporation, a semiconductor manufacturing company, was acquired by ON Semiconductor Corporation on September 18, 2016.

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 NE555 is a popular timer integrated circuit (IC) that can be used to generate precise time delays, oscillations, and pulse-width modulation (PWM) signals.

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 are available within the file: 555, LM555, LM555CM, LM555CMX, LM555CN

 

Several ICs that are similar to the NE555

1. LM555: Functionally equivalent version with improved temperature stability and wider operating voltage range.

2. TLC555: Low-power version with reduced power consumption and improved timing accuracy.

3. LMC555: Low-voltage version with a wide supply voltage range of 1.5V to 15V.

4. ICM7555: Improved temperature stability and reduced power consumption.

5. NE556: Dual version contains two independent timers in a single package.

 

NE555 Datasheet PDF Download

Part Number: EF68B40P

Function: Frequency clock 2 MHz Programmable Timer

Package: DIP 28 Pin Type

Manufacturer: STMicroelectronics , Thomson Semicondcutor

Images :

Description

The EF68B40P is a programmable subsystem component of the 6800 family designed to provide variable system time intevals. The EF6840 has three 16-bit binary counters, three corresponding control registers and a status register. These counters are under software control and may be used to cause system interrupts and / or generate output signals.

 

Features

1. Operates from a single 5 V power supply

2. Single system clock required ( Enable )

3. Fully TTL compatible

4. Programmable interrupt (IRQ) output to MPU

5. Readable down counter indicates conunts to go to time-out

6. Three maskable outputs

 

Other data sheets are available within the file: EF6840, EF6840C, EF6840E, EF6840J, EF6840P, EF68A40P

EF68B40P Datasheet PDF Download