ICM/ (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest go to ). The Maxim ICM and ICM are respectively single . with the descriptive excerpts from the original manufacturer’s data sheet have been included in this. ICM | Counter/Time Base ICs | Renesas Datasheet The ICM and ICM are CMOS RC timers providing significantly improved performance.

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These values should be considered “ball park” values, instead the current official datasheet from the exact manufacturer of each chip should be consulted for parameter limitation recommendations.

Archived from the original on January 9, A few days later, he got the idea of using a direct resistance instead of a constant current source, and found that it worked.

Over the years, numerous IC companies have merged. The change decreased the required 9 pins to 8, so the IC could be fit in an 8-pin package instead of a pin package.

These specifications apply to the bipolar NE For bipolar timers, a decoupling capacitor is required because of current surges during output switching.

timer IC – Wikipedia

The IC was designed in by Hans R. Archived from the original on October 4, By using this site, you agree to the Terms of Use and Privacy Policy.

Numerous companies have manufactured one or more variants of the, timers over the past decades as many different part numbers. Electronic oscillators Linear integrated circuits. For good design practices, a decoupling capacitor should be included, however, because noise produced by the timer or variation in power supply voltage might interfere with other parts of a circuit or influence its threshold voltages.


The Apple II microcomputer used a quad timer in monostable or “one-shot” mode to interface up to four “game paddles” or two joysticks to the host computer. The output pulse width can be lengthened or shortened to the need of the specific application by adjusting the values of R and C. The can be used to provide time delays, as an oscillatorand as a dataheet element. The dual timer is available in through hole packages as DIP 2.

Datasyeet block diagram [1]. There was no problem, so it proceeded to layout design. In the astable mode, the frequency of the pulse stream depends on the values of R 1R 2 and C:.

555 timer IC

Camenzind proposed the development of a universal circuit based on the oscillator for PLLs, and asked that he would develop it alone, borrowing their equipment instead of having his pay cut in half.

Now the capacitor charges towards supply voltage Vcc. From Wikipedia, the free encyclopedia. The low time will be the same as above, 0.

It features two complete s in a 14 pin package. Thus configured, pulling the trigger momentarily to ground acts as a ‘set’ and transitions the output pin pin 3 to V CC high state. In other projects Wikimedia Commons. The timer was manufactured by 12 companies in and it became the best selling product. Archived PDF from the original on June 29, A series resistor of ohms must be added to each R1 and R2 to limit peak current of the transistor within when R1 and R2 are at minimum level.


To have an output high time shorter than the low time i. Pinout of single timer 8 pins [1] [2]. In most applications this pin is not used, thus it should be connected to V CC to prevent electrical noise causing a reset. The new parent company inherits everything from the previous company then datasheets and chip logos are changed over a period of time to the new company.

Retrieved from ” https: It has four reduced-functionality timers in a 16 pin package four complete timer circuits would have required 26 pins. As of [update]it was estimated that 1 billion units were manufactured every year. Control or Control Voltage: Retrieved June 29, Derivatives provide two or four timing circuits in one package. Archived PDF from the original on June 28, The input signal should be connected through a series capacitor which then connects to the trigger and threshold pins.

The dual version is called The timer IC is an integrated circuit chip used in a variety of timerpulse generation, and oscillator applications. Camenzind also taught circuit design at Northeastern University in the morning, and went to the same university at night to get a master’s degree in Business Administration.

The following is a partial list:

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