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