Using an ICL7660 to feed -5VDC to 4116 DRAMs?

Ethan Dicks ethan.dicks at
Wed Jul 2 12:48:43 CDT 2008

On Wed, Jul 02, 2008 at 01:41:21PM -0400, Dave McGuire wrote:
>   DRAM chips tend to draw spikes of current during refresh, as those  
> little capacitors get charged.

Sure... I'm used to that with +5V-only chips like the 4164 and
up, but I don't have any design experience with the multi-voltage
parts, thus my caution.

>  If you have adequate low-impedance  
> bypassing to supply those short-term demands, things should be fine  
> with the 7660.  It's a fairly predictable and dependable chip.

By low-impedance bypassing, you mean monolithic (not electrolytic) caps,
or do you mean something else?
> >... I wouldn't be able to get an order from Digikey for nearly 4
> > months in any case.  I have to use what's on hand.
>   Good heavens, one would think you're in Antarctica or something.
>   Oh, wait.. ;)

Yes... ;) indeed.


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