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saurabhsoni
Joined: 11 Oct 2006
Posts: 2
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 20 Dec 2006 10:25 555 Timer |
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hi guys
just wanted to know why the 555 timer is called a 555 timer. do the three 5's have any importance as such?
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20 Dec 2006 10:25 Ads |
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ZeleC
Joined: 18 Dec 2002
Posts: 296
Helped: 2
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20 Dec 2006 10:41 555 Timer |
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its just the name like 74hc00 ...
the dble timer chip is 556
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ahmad_abdulghany
Joined: 12 Apr 2005
Posts: 1369
Helped: 212
Location: Cairo, Egypt
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20 Dec 2006 12:57 Re: 555 Timer |
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Yes, The name of 555 came from the three 5kOhms resistors at its input!
important or not, it's not clear  as they're a part in the IC structure! and according to them it works !
I hope that helps
ahmad,
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rakesh1234
Joined: 12 Dec 2006
Posts: 95
Helped: 6
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21 Dec 2006 8:17 Re: 555 Timer |
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| the 555 name came from the fact that it has three 5k resistors in it's construction. to make a potential divider network.
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nguyennam
Joined: 06 Sep 2006
Posts: 459
Helped: 28
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21 Dec 2006 16:32 Re: 555 Timer |
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Yeah, exactly, its name comes from its 3 resistors of 5kOhm. The story about 555 history told that when its original designers from Signetics wanted to choose its name, they just realized that its unique feature is those 3 resistors, and so its name is 555.
Sometimes, there is a story about device's number, as 555 for example, and it is also the very famous IC which has been alive for 4 decades, from early 1970's.
One another famous IC also, everyone knows, that is 741, but I never heard about its name story.
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rabel126
Joined: 08 Feb 2006
Posts: 101
Helped: 12
Location: pakistan
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02 Jan 2007 20:55 Re: 555 Timer |
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| due to 3 5k.ohm resistors
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