DESCRIPTION

The  SC91214/15  Series  is  a  single-chip,  silicon  gate,  CMOS integrated  circuit  with  an  on-chip  oscillator  for  a  3.58MHZ  crystal  or ceramic  resonator.  It  provides  a  dialing  pulse  (DP)  or  dual  tone  multi-frequency (DTMF) dialing. A standard 4 X4 matrix keyboard can be used to support either DP or DTMF modes.

FEATURES

* One touch redial operation

* Tone/Pulse switchable

* 32 digit capacity for redialing

* Automatic mixed redialing (last number redial) of pulse to DTMF with multiple automatic access pauses

* PABX auto-pause is 2.2 seconds

* DTMF Timing:

   Manual dialing: minimum duration for bursts and pauses Redialing: calibrated timing

* Hands-Free control function

* Wide operating voltage range: 2V to 5.5V

* Key-in beep tone output

* Digits dialed manually after redialing are cascadable and stored as additional digits for the next redialing

* Uses inexpensive ceramic resonator (3.58 MHZ)

* Two versions for different telephone systems

* Built-in power up reset circuit

* Four extra function keys: flash, pause, redial and DP or DTMF mixed dialing

* 4 X 4 (or 2 X 8) keyboard can be used

* Low standby current