UM91214

The UM91214 is a single-chip,silicon gate,CMOS integrated circuit with an on-chip oscillator for a 3.57MHz crystal or ceramic resonator.It provides dialing pulse(DP) or dual tone multi-frequency(DTMF) dialing.

Features of the UM91214 are:(1)one touch redial operation;(2)tone/pulse swirtchable;(3)32-digit capacity for redialing;(4)automatic mixed redialing(last number redial) of pulse to DTMF with multiple automatic access pauses;(5)PABX auto-pause is 2.2 seconds;(6)DTMF timing:manual dialing..minimum duration for bursts and pauses,redialing..calibrated timing;(7)hands-free control function;(8)wide operating voltage range:2V to 5.5V;(9)key-in beep tone output;(10)digits dialed manually after redialing are cascadable and stored as additional digitals for the next redialing;(11)uses inexpensive ceramic resonator(3.58MHz);(12)two versions for different telephones systems;(13)built-in power up reset circuit;(4)four extra function keys:flash,pause,redial and DP or DTMF mixed dialing;(15)four-by-four(or 2 of 8)keyboard can be used;(6)low standby current.

The absolute maximum ratings of the UM91214 can be summarized as:(1)supply voltage(VDD):6.0V;(2)input voltage(VIN):VSS-0.3V to VDD+0.3V;(3)output voltage(VOUT):VSS-0.3V to VDD+0.3V;(4)output voltage(VOUT)(DP,XMIT MUTE):1.2V;(5)tone output current(Itone):50mA;(6)power dissipation(PD):500mW;(7)operating temperature(TOP):-20 to +70;(8)storage temperature(Tstg):-40 to +125.

If you want to know more information such as the electrical characteristics about the UM91214, please download the datasheet in www.seekic.com or www.chinaicmart.com .