DPRG
DPRG List  



[DPRG] Electrolytic

Subject: [DPRG] Electrolytic
From: Shaun Parsons Shaunp at CASHPOWER.CO.ZA
Date: Wed Jan 14 23:46:00 CST 2004

0.1uF 0805 Ceramics should be fine.
Placing 2 caps in parallel will reduce the ESR of the cap and ensure that
you will have at least 
0.16uF. (2x 0.1uF -20% worst case), but is not necessary unless your RS232
lines will be heavily load. (long serial link, high baud rates etc.)

Regards
Shaun


-----Original Message-----
>From: Ed Okerson [mailto:eokerson at texasconnect.net]
Sent: Wednesday, January 14, 2004 11:33 PM
To: DPRG List
Subject: [DPRG] Electrolytic


I am working on a 3.3V circuit and need to connect it to a serial RS232
port.  So I picked up some MAX3232 chips and started pondering.  The spec
sheet shows 5 capacitors connected to the chip, all of them 0.1uf and all
are marked with a + on one side.  That would seem to indicate to me that
they are using electrolytic capacitors.  My question is this:  Is it
really necessary to use electrolytics in this circuit?  I have scads of
0805 surface mount 0.1uf caps, and can make the board a lot smaller with
them.  I have no surface mount electrolytics, and all of the 0.1uf
electrolytics that I do have will use a lot more board space.  Any
suggestions?

Ed Okerson

_______________________________________________
DPRGlist mailing list
DPRGlist at dprg.org
http://nimon.ncc.com/mailman/listinfo/dprglist


NOTICE OF CONFIDENTIALITY

The information contained in this e-mail message and in the documents
attached herewith (hereinafter "the message") is intended only for the
individual or the entity named above and is intended to be confidential.

The reading of the message or any retention, copying, dissemination,
distribution, disclosure of the existence of the message or of its contents,
or any other use of the message or any part thereof, by anyone other than
the intended recipient is strictly prohibited.  If you received this message
and you are not the intended recipient or agent responsible for the delivery
of this message to the intended recipient, please refrain from reading it
and notify us immediately by telephone +27 (11) 921-7900, so that we can
co-ordinate with you, erasure of the message.

Although this e-mail and its attachments are believed to be free of any
virus or other defect, it is the responsibility of the recipient to ensure
that they are virus-free, and no responsibility is accepted by this firm for
any loss or damage arising from receipt or use thereof.



More information about the DPRG mailing list