W91521N Datasheet | Winbond

W91520N SERIES TONE/PULSE DIALER WITH HANDFREE AND HOLD FUNCTIONS GENERAL DESCRIPTION The W91520N series are Si-gate CMOS ICs that provide the necessary signals for tone or pulse dialing. The W91520N series provide one-key redial, handfree dialing, hold, save, and redial functions. Features - DTMF/pulse switchable dialer - Two by 32-digit redial and save memory - Pulse-to-tone (- /T) keypad for long distance call operation - Uses 5 × 5 keyboard - Easy operation with redial, flash, pause, and - /T keypads - Pause, pulse-to-tone (- /T) can be stored as a digit in memory - On-hook debounce time: 150 m S - Dialing rate (10 pp S, or 20 pp S) selectable by bonding option - Minimum tone output duration: 93 msec. - Minimum intertone pause: 93 msec. - Flash break time (73, 100, 300, 600 msec.) selectable by keypad; pause time is 1.0 sec. - On-chip power-on reset - Uses 3.579545 MHz crystal or ceramic resonator - Packaged in 18 or 20-pin plastic DIP - The different...