IC TP5089 DTMF Touch-Tone Generator DIP 16-pin

TP5089 DTMF Touch-Tone Generator DIP-16

The TP5089 is a low threshold voltage, field-implanted, metal gate CMOS integrated circuit. It interfaces directly to a standard telephone keypad and generates all dual tone multi-frequency pairs required in tone-dialing systems. The tone synthesizers are locked to an on-chip reference oscillator using an inexpensive 3.579545 MHz crystal for high tone accuracy. The crystal and an output load resistor are the only external components required for tone generation. A MUTE OUT logic signal, which changes state when any key is depressed, is also provided.

Features

3.5V ±10V operation when generating tones

2V operation of keyscan and MUTE logic

Static sensing of key closures or logic inputs

On-chip 3.579545 MHz crystal-controlled oscillator

Output amplitudes proportional to supply voltage

High group pre-emphasis

Low harmonic distortion

Open emitter-follower low-impedance output

SINGLE TONE INHIBIT pin

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