KS5851

The KS5851 is a monolithic CMOS integrated circuit which uses an inexpensive RC oscillator for its frequency reference and provides all the features required for implementing a pulse dialer with 32 digit redial. It has the function of MUTE output logic "0"; PULSE output logic "0"; RC oscillation for reference frequency; designed to operate directly from the telephone line; used CMOS technology for low voltage, low power operation

The features of KS5851 can be summarized as (1)wide operating voltage range (2.0~6.0V); (2)low power dissipation ; (3)use either a standard 2 of 7 matrix keyboard with negative true common or the inexpensive form A-type keyboard; (4)make/break ratio can be selected ; (5)redial with * or #; (6)continuous MUTE ; (7)power up clear circuitry on chip ; (8)KS5851 pin 2: Vref, KS5B52 pin 2: tone output ; (9)10 pps/20 pps can be selected.

The absolute maximum ratings of KS5851 are (1)supply voltage VDD: 6.2V; (2)input voltage VI: Gnd - 0.3, VDD + 0.3 V; (3)output voltage VO: Gnd - 0.3, VDD + 0.3 V; (4)power dissipation PD: 500 mW ; (5)operating temperature TOPR :- 20 to + 70 °C ; (6)storage temperature Ten: - 40 ~ +125°C.