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