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From: ron@topaz.rutgers.edu (Ron Natalie)
Newsgroups: sci.electronics
Subject: Re: DTMF
Message-ID: <13386@topaz.rutgers.edu>
Date: Sun, 19-Jul-87 20:25:29 EDT
Article-I.D.: topaz.13386
Posted: Sun Jul 19 20:25:29 1987
Date-Received: Mon, 20-Jul-87 00:39:25 EDT
References: <1377@mit-amt.MEDIA.MIT.EDU>
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 10

Silicon Systems SSI 201 Integrated DTMF Reciever.  I bought mine
for $5.00 including the crystal and a 22 pin socket.

Outputs in binary (except that Zero is coded 10)
Uses 12V supply and a Color Burst (3.579545 MHz) Crystal.

The application notes even point out how to add pusle dial
detection to the chip.

-Ron