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Electronics => Electronics => Topic started by: jsmoker on April 23, 2007, 11:23:08 AM

Title: looking for cheap TTL to RS232; not max232
Post by: jsmoker on April 23, 2007, 11:23:08 AM

I was wondering, is there a full duplex chip that doesn't require any shorts or connections or capacitors.    I've worked with the MAX232 but I fee like it's an unnecessary pain to add capacitors.  Even with the MAX233, you still have to short a couple of the leads...again, what's with the extra work?  Is there a simple chip where all you connect is power, ground, UART I/O and RS232 I/O?  Mind you, full duplex, I've also DS275, but even with that, you have to short one pair of leads and it's only half duplex.

-JSmoker

Title: Re: looking for cheap TTL to RS232; not max232
Post by: JonHylands on April 23, 2007, 11:24:24 AM

I've never found one. I use the DS-275 for most of my older stuff, although now I've started switching to USB solutions.

- Jon

Title: Re: looking for cheap TTL to RS232; not max232
Post by: hazzer123 on April 23, 2007, 11:25:34 AM

Just curious... Why does it matter so much to short a few leads? I mean, it doesn't take two seconds.

Title: Re: looking for cheap TTL to RS232; not max232
Post by: jsmoker on April 23, 2007, 11:27:26 AM

I like clean board with as few connections as possible... and I'm lazy...

-JSmoker

PS, sorry about the double post, didn't think the first one went through.

Title: Re: looking for cheap TTL to RS232; not max232
Post by: Admin on April 23, 2007, 11:30:54 AM

the MAX232 is actually like one or two decades old technology, there are many other better ICs today that offer rs232 functionality without the pains you mention - just search digikey for 'rs232'

digikey has like 450+ types in DIP alone . . .