 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
NE555 Datasheet(PDF) 8 Page - Diodes Incorporated |
|
|
|||||||||||||||||||||||||||||
NE555 Datasheet(HTML) 8 Page - Diodes Incorporated |
|
|
8 / 14 page  NE555/SA555/NA555 Document number: DS35112 Rev. 5 - 2 8 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Typical Applications Characteristics (cont.) Astable Operation As shown in Figure 4, adding a second resistor, RB, to the circuit of Figure 1 and connecting the trigger input to the threshold input causes the timer to self-trigger and run as a multivibrator. The capacitor C charges through RA and RB and then discharges through RB. Therefore, the duty cycle is controlled by the values of RA and RB. This astable connection results in capacitor C charging and discharging between the threshold-voltage level ( ≉0.67VCC) and the trigger- voltage level ( ≉0.33VCC). As in the monostable circuit, charge and discharge times (and, therefore, the frequency and duty cycle) are independent of the supply voltage. C RL RA RB THRES TRIG DISCH RESET CONT VCC GND OUT Output 4 7 6 2 1 3 8 5 Open (See Note A) VCC (5V to 15V) Decoupling CONT voltage to ground with a capacitor can improve operation. This should be evaluated for individual applications. 0.01µF Fig. 4 Circuit for Astable Operation Fig. 5 Typical Astable Waveforms Figure 5 shows typical waveforms generated during astable operation. The output high-level duration tH and low-level duration tL can be calculated as follows: tH = 0.693(RA +RB)C tL = 0.693(RB)C Other useful equations are: period = tH + tL = 0.693(RA + 2RB)C frequency = 1.44/(RA + 2RB)C output driver duty cycle = tL/(tH + tL) = RB/(RA + 2RB) output waveform duty cycle = tH/(tH + tL) = 1 – RB/(RA + 2RB) low to high ratio = tL/tH = RB/(RA + RB) Fig. 6 Free Running Frequency |
Similar Part No. - NE555 |
|
Similar Description - NE555 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
