Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!comp.vuw.ac.nz!kauri.vuw.ac.nz!cyborg From: cyborg@kauri.vuw.ac.nz (Alex Ivopol) Newsgroups: sci.electronics Subject: Re: ? Touch Tone Decoder IC Message-ID: <1991Apr27.013632.219@comp.vuw.ac.nz> Date: 27 Apr 91 01:36:32 GMT References: <1629@west.West.Sun.COM> Sender: news@comp.vuw.ac.nz (News Admin) Organization: Victoria University of Wellington, New Zealand Lines: 16 Nntp-Posting-Host: kauri.vuw.ac.nz flloyd@L1-A.West.Sun.COM (Fred Lloyd SUN Phoenix SE 602-275-5537 x17) writes: > Can anyone recommend a good Touch Tone Decoder IC? I'd like to decode > all 16 tones with a 4 bit output and strobe. I'd like a cheap solution > with minimum parts count. Check out the MC145436 (Motorola). It has 4 bit output with strobe, decodes all 16 tones, outputs can be placed into high impedance mode. From memory, the only external components are a 3.579545Mhz Xtal in parallel with a 1Mohm resistor. It provides an output clock for chaining several such devices from a single Xtal. Maximum supply voltage is 6v. I got the data sheet somewhere around here so if anyone is interested I can mail more info... -- Alex T. IVOPOL cyborg@kauri.vuw.ac.nz