Searching \ for '[PIC]: [EE]: Flip-Flop with memory' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/microchip/memory.htm?key=memory
Search entire site for: '[EE]: Flip-Flop with memory'.

Exact match. Not showing close matches.
PICList Thread
'[PIC]: [EE]: Flip-Flop with memory'
2001\09\27@013856 by Ed Heath

flavicon
face
Sorry for the repost forgot to fill in subject. DA!

Hey guys,

I need a flip flop circuit with a one or two second memory
after power has been removed and then turned back on.
12 Vdc level to power two different circuits through transistors.
It has to work like this :

1. power applied / output 1 active
2. power removed & re-applied before timeout / output 2 active
3. power removed & re-applied after timeout / output 1 active

I have been kicking this around for a few days and have not
found any simple solution.

Thanks
Ed Heath
IAI

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email spam_OUTlistservTakeThisOuTspammitvma.mit.edu with SET PICList DIGEST in the body


2001\09\27@130904 by Mike Hardwick

flavicon
face
Ed,

Here's a concept: Connect a capacitor at the D input of a D type FF. Charge
the cap through a large resistor, so that it takes a second or two to
discharge after power is cut. Clock the FF once at power-up time,
immediately after supply voltage stabilizes. The Q output gives your
desired status after power up. If the cap gets discharged by leakage
through the D input when your supply is at zero volts, isolate it with
another resistor...

Mike Hardwick
Decade Engineering


>I need a flip flop circuit with a one or two second memory
>after power has been removed and then turned back on.
>12 Vdc level to power two different circuits through transistors.
>It has to work like this :
>
>1. power applied / output 1 active
>2. power removed & re-applied before timeout / output 2 active
>3. power removed & re-applied after timeout / output 1 active

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email .....listservKILLspamspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body


2001\09\28@095042 by Fritz Braun Jr.

flavicon
face
Try Ramtron. http://www.ramtron.com They came out with an equivalent device several
months ago.

----- Original Message -----
From: "Ed Heath" <iaspamKILLspamNORTHLAND.LIB.MI.US>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Thursday, September 27, 2001 01:28
Subject: [PIC]: [EE]: Flip-Flop with memory


Sorry for the repost forgot to fill in subject. DA!

Hey guys,

I need a flip flop circuit with a one or two second memory
after power has been removed and then turned back on.
12 Vdc level to power two different circuits through transistors.
It has to work like this :

1. power applied / output 1 active
2. power removed & re-applied before timeout / output 2 active
3. power removed & re-applied after timeout / output 1 active

I have been kicking this around for a few days and have not
found any simple solution.

Thanks

Ed Heath
IAI

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email EraseMElistservspam_OUTspamTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

--
http://www.piclist.com hint: To leave the PICList
piclist-unsubscribe-requestspamspam_OUTmitvma.mit.edu


2001\09\28@115612 by Dan Larson

flavicon
face
Yes, Ramtron has a non-volatile '74 flip-flop chip. They
also have FRAM chips based on the same technology that has
no write speed penalty the way EEPROM does. I2C, SPI, and
parallel FRAM's are available. They were very generous to
send samples, though I have not had a chance to try them
out yet. to me as well. The only problem I see is that
I don't know of any major distributors that carry them.

Dan

On Fri, 28 Sep 2001 09:12:24 -0400, Fritz Braun Jr. wrote:

>Try Ramtron. http://www.ramtron.com They came out with an equivalent device several
>months ago.
>
>{Original Message removed}

More... (looser matching)
- Last day of these posts
- In 2001 , 2002 only
- Today
- New search...