Using an ICL7660 to feed -5VDC to 4116 DRAMs?
ethan.dicks at usap.gov
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.
Ethan Dicks, A-333-S Current South Pole Weather at 2-Jul-2008 at 17:40 Z
South Pole Station
PSC 468 Box 400 Temp -81.9 F (-63.3 C) Windchill -121.1 F (-85.1 C)
APO AP 96598 Wind 10.8 kts Grid 46 Barometer 680.7 mb (10602 ft)
Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html
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