Chip with one-bit permanent memory

 

I'm looking for a (logic)chip with one or few bits of permanet memory,
e.g.the status is saved over a power down period. If possible at all it
should operate in a voltage range up to 18V (automotive application).

Many thanks for hints.

- Wilfried

 



Wilfried Kaern wrote:


A battery backed up flip-flop or 2 ?

More sensibly, use an eeprom.

Graham

 

On Fri, 2 Jun 2006 11:56:12 +0200, "Wilfried Kaern"


Not a lot of information about what is interfaced to the bits. The
simplest "memory" might be a 12 V nominal, latching relay rated for
an automotive environment.

--
Rich Webb   Norfolk, VA

 


Does it have to be solid state?  Would a latching relay, or one of
those twisting-solenoid pixels they use in big signage work?

There are plenty of many-kilobit memories, but they'll depend on your
interface requirements.

How about a lithium battery-backed CMOS latch?

If we knew more about the intended application, or the problem you are
trying to solve, we might be able to be more helpful...

 

Sure, a latched relay would do the job. I just have the idea to realize this
simple piece of electronic in solid state. And using an eeprom (with timing
circuits) would be wasting most of it.

To describe the function: Two seconds after starting the car, a (potential
free) resistor has to be switched between 100 Ohm and infinite (open
circuit), however, only every second time. The power used at the
installation place is switched on and off with the car engine. So this is
used to power the circuit and as the switch pulse. All this has to be in a
very small housing, using little energy. The 100 Ohm resistor is used only
for calibrating purposes, practically drawing no current. All this operated
at car board power.

- Wilfried