W91521N

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 mS Dialing rate (10 ppS, or 20 ppS) 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 d...