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desperado1
Joined: 04 Sep 2006
Posts: 194
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 10 Feb 2009 12:07 Can 555 timers be used as RS flip flops ? |
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| The 555 timer contains an RS flip flop. Can 555 timer be used as an RS flip flop ?
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erikl
Joined: 09 Sep 2008
Posts: 736
Helped: 139
Location: Germany
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10 Feb 2009 16:35 Re: Can 555 timers be used as RS flip flops ? |
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| desperado1 wrote: |
| The 555 timer contains an RS flip flop. Can 555 timer be used as an RS flip flop ? |
Why not? Control via the inputs CONTROL_VOLTAGE / THRESHOLD and TRIGGER.
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desperado1
Joined: 04 Sep 2006
Posts: 194
Helped: 6
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11 Feb 2009 2:35 Can 555 timers be used as RS flip flops ? |
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can you give the schematic please ? i m new with 555 timer.................
thanks in advance
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erikl
Joined: 09 Sep 2008
Posts: 736
Helped: 139
Location: Germany
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11 Feb 2009 11:58 Re: Can 555 timers be used as RS flip flops ? |
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You can find it at any dateSheet service, e.g. here:
http://search.datasheetcatalog.net/key/NE555
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desperado1
Joined: 04 Sep 2006
Posts: 194
Helped: 6
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12 Feb 2009 9:04 Can 555 timers be used as RS flip flops ? |
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i want the schematic and not the datasheet
Added after 1 minutes:
in which pin should we give R input and in which pin should we give S input .............and do we need to short any pins.
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erikl
Joined: 09 Sep 2008
Posts: 736
Helped: 139
Location: Germany
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12 Feb 2009 11:27 Re: Can 555 timers be used as RS flip flops ? |
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| desperado1 wrote: |
| i want the schematic and not the datasheet |
The datasheet contains the schematic.
| desperado1 wrote: |
Added after 1 minutes:
in which pin should we give R input and in which pin should we give S input .............and do we need to short any pins. |
I already told you in my first answer. I suggest you read more thoroughly!
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desperado1
Joined: 04 Sep 2006
Posts: 194
Helped: 6
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12 Feb 2009 11:43 Can 555 timers be used as RS flip flops ? |
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| i read it thoroughly but cudn't get a clue on how to use it as a RS flip flop......?? plz suggest me
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erikl
Joined: 09 Sep 2008
Posts: 736
Helped: 139
Location: Germany
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12 Feb 2009 12:30 Re: Can 555 timers be used as RS flip flops ? |
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| desperado1 wrote: |
| i read it thoroughly but cudn't get a clue on how to use it as a RS flip flop......?? plz suggest me |
| erikl wrote: |
| Control via the inputs CONTROL_VOLTAGE / THRESHOLD and TRIGGER. |
Ok, a little bit more. Here's a symbolic representation of a 555 IC :
It's from http://www.elektronik-kompendium.de/public/schaerer/st555.htm , and it includes the explanation, but in German language. Essentially it says:
A LOW pulse at the TRIGGER input (pin 2) sets the RS-FlipFlop: OUTPUT (pin 3) gets HIGH. A HIGH pulse at the THRESHOLD input (pin 6) resets the RS-FlipFlop and OUTPUT (pin 3) goes LOW.
If the input CONTROL-VOLTAGE (pin 5) is not used (to change the trigger level), connect it with a 100nF cap to GND. If /RESET/ (pin 4) isn't used, connect it to Vcc. Leave DISCHARGE (pin 7) open.
HTH!
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desperado1
Joined: 04 Sep 2006
Posts: 194
Helped: 6
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13 Feb 2009 10:36 Can 555 timers be used as RS flip flops ? |
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| Thank you so much............i.e. i can take pin 2 as the R input and can take pin 6 as the S input. Am i right ???
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13 Feb 2009 10:36 Ads |
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erikl
Joined: 09 Sep 2008
Posts: 736
Helped: 139
Location: Germany
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13 Feb 2009 12:12 Re: Can 555 timers be used as RS flip flops ? |
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| desperado1 wrote: |
| i.e. i can take pin 2 as the R input and can take pin 6 as the S input. Am i right ??? |
Not quite:
| erikl wrote: |
| A LOW pulse at the TRIGGER input (pin 2) sets the RS-FlipFlop: OUTPUT (pin 3) gets HIGH. A HIGH pulse at the THRESHOLD input (pin 6) resets the RS-FlipFlop and OUTPUT (pin 3) goes LOW. |
You really should read more thoroughly  Is this, possibly, your problem ... and the reason for your name? ' '
Pin 2 is your /S/ (active LOW), and pin 6 is your R (active HIGH).
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sreevyas
Joined: 04 Feb 2009
Posts: 113
Helped: 3
Location: India
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13 Feb 2009 13:26 Re: Can 555 timers be used as RS flip flops ? |
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| See the data sheet with application circuit, you can findout how to use
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