The inverter could be a simple transistor inverter, a small 3 pin device, and probably 2 resistors. I use one to invert a serial (going one way into a MAX232, the other through the inverter to a fiber optic transmitter). The fiber optic then gets converted to RD-485. I wold put the device and design out, but, don't consider my expertise sufficient for others. Sure someone else expert can help if need be. Michael Rigby-Jones wrote: > >> -----Original Message----- >> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] >> On Behalf Of William Couture >> Sent: 22 June 2007 13:02 >> To: Microcontroller discussion list - Public. >> Subject: Re: [EE] 16 to 1 Analog multiplexer? >> >> >> On 6/22/07, Kevin Timmerman wrote: >> >> >>> Two 74HC4051 (8 to 1 mux) with the outputs tied together. Enable one >>> or the other, no need for a 2 to 1 mux. >>> >> Hmmm... so I'd use 3 address lines to each chip, with the 4th >> address line used as the chip select (with an inverter for the >> 2nd chip select, something like a 74hc1g00). So it's 3 chips >> (or should I say 2 1/2 chips? :)) That's better, though I'd >> still like a 1 chip solution. >> > > How about the 74HC4067? http://focus.ti.com/docs/prod/folders/print/cd74hc4067.html > > Have you looked at Analog Devices? They have a wide range of muxes up to 32:1, some even have SPI interface. > http://www.analog.com/en/subCat/0,2879,768%255F836%255F0%255F%255F0%255F,00.html > > Regards > > Mike > > > ======================================================================= > This e-mail is intended for the person it is addressed to only. The > information contained in it may be confidential and/or protected by > law. If you are not the intended recipient of this message, you must > not make any use of this information, or copy or show it to any > person. Please contact us immediately to tell us that you have > received this e-mail, and return the original to us. Any use, > forwarding, printing or copying of this message is strictly prohibited. > No part of this message can be considered a request for goods or > services. > ======================================================================= > > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist