U4076B-FL - TEMIC Semiconductors

U4076B-FL Three-Tone Ringer for Telephone Sets

The three-tone ringing integrated circuit U4076B, in conjunction with a piezo transducer or loudspeaker replaces the normal electromechanical telephone bell. It is operated with the ringing current from the exchange. There is also a possibility of operating the IC with the dc supply voltage, being developed for large operating range. The integrated circuit i.

Features

D Three-tone ringing sequence with 800 Hz, 1067 Hz and 1333 Hz D Clock oscillator with ceramic resonator or LC series cct possible D Sequence frequency adjustable between 2.5 Hz and 25 Hz D Input protective diode D On-chip rectifier bridge D Protection circuit against ringing in a parallel circuit D D D D D Adjustable volume Push-pull output stage Piezo transducer or loudspeaker connection Common input for frequency and call recognition Reduced pulse duration for electromagnetic transducers Benefit D Suitable for German Post Office Specification, FTZ 121671 Pfl. 3, edition dated 24.03.82.