Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!samsung!zaphod.mps.ohio-state.edu!mips!krell!freeptos From: freeptos@mips.COM (Dan Freitas) Newsgroups: sci.electronics Subject: Re: Using MC1488 for TTL->RS-232 Message-ID: <34032@mips.mips.COM> Date: 1 Jan 90 01:48:36 GMT References: <1990Jan1.001244.24596@utzoo.uucp> Sender: news@mips.COM Reply-To: freeptos@mips.COM (Dan Freitas) Organization: MIPS Computer Systems, Sunnyvale, CA Lines: 20 >The right way to convert TTL to RS232 is to use the Maxim MAX232 or any >of several related chips from Maxim and others. They include both >transmitters and receivers, generate the necessary voltages themselves >from +5 (with the aid of a few capacitors), and hew rather closer to >the RS232 specs to boot. The MC1488 is obsolete. >-- I just got a sample of such a chip from Motorola. It is the MC145407 5v only driver/receiver. Drives/Receives 3 separate lines. You add (4) 10uf caps, 5v and your on your way. Dan Freitas -- UUCP : {decvax,ucbvax,hplabs}!decwrl!mips!freeptos or freeptos@mips.com USPS : Mips Computer Systems; 930 Arques Ave; Sunnyvale, Ca 94086 PHONE: 408-991-0217