Winbond Electronics Corporation W91520N
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.GENERAL DESCRIPTION
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