LR4087B

The LR4087B is monolithic tone dialer LSI which uses an inexpensive crystal reference to provide eight audio sinusoidal frequencies.Dual-Tone multi-frequency signals are obtained by mixing these frequencies.

The LR4087B has 9 features.The first one is tone output:bipolar.The second one is mute output:complementary.The third one is uses either a standard 2-of-8 matrix keyboard or a sigle contact keyboard.The fourth one is uses a 3.579 545 MHz color-burst crystal oscillator as a frequency reference.The fifth one is direct telephone-line operation.The sixth one is standard dual-tone-multi-frequency(DTMF) telephone dialing.The seventh one is generates signal tones.The eighth one is on-chip regulation of dual and sigle tone amplitudes.The ninth one is package:LR4087B is 16-pin DIP(DIP016-P-300B).

The LR4087B has some absolute maximum ratings.When parameter is supply voltage,the symbol is VDD,the rating is -0.3 to +6.3,the unit is V.When parameter is operating temperature,the symbol is Topr,the rating is -30 to +60,the unit is .When parameter is storage temperature,the symbol is Tstg,the rating is -55 to +150,the unit is .When parameter is power dissipation,the symbol is PD,the rating is 500,the unit is mW.When parameter is pin voltage,the symbol is VIN1,the rating is -0.3,the unit is V.When parameter is pin voltage,the symbol is VIN2,the rating is +0.3,the unit is V.