U4076B Datasheet | TEMIC Semiconductors

Description 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 is overload protected. 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 mon 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 22 m F 2.2 k W a ~ ~ b 0.8 m F 4 7 (5) 6 (7) 600 k W 10 (11) 43 k W 8 (9) 4.7 n F 9 (10) (15) 13 Ground: output signal Open: output signal (8) Supply 5 (6) Level monitoring Tone sequence oscillator Divider 32:1 Tone signal generator 11 Reset a (12) 100 k W log 12 (13) 96 ms 127 ms Frequency monitoring Frequency Three state Divider 32:1 Divider 14:1 Clock signal generator 3 (3) 93 7792 e Reset b 2 (2) 455 k Hz Divider 128:1 Divider 2:1 14 (16) 1 (1) Figure 1. Block diagram and application circuit Case: DIP14 or SO16-L (Pin connections for SO 16-L case in bracket) TELEFUNKEN Semiconductors Rev. A1, 15-May-96 1 (6) Preliminary Information Pin Description Pin 1 (1) Symbol Function Frequency monitoring Open: 23 to 54 Hz Ground: 12 to 54 Hz With Pin 6 (7) connected: Switched off Clock signal generator Ground Power supply Charging capacitor, CL, for bridge rectifier Frequency oscillator Pin 8, 9, 10 (9, 10, 11) 11, 12 (12, 13) 13 (15) 14 (16) (4, 14) Symbol Function Tone...