GENERAL DESCRIPTION

The W91440N series are Si-gate CMOS ICs that provide the necessary signals for either tone or pulse dialing. The W91440N series features save memory and a 10 by 16 digit automatic dialing memory.

FEATURES

? DTMF/pulse switchable dialer

? Two by 32 digit redial and save memory

? Ten by 16 digit two-touch direct memory

? Redial memory cascadable with normal dialing; dialing length is unlimited, but if length oversteps 32 digits the redial function is inhibited

? Pulse-to-tone (*/T) keypad for long distance call operation

? Uses 5 ′ 5 keyboard

? Easy operation with redial, flash, pause and */T keypads

? Flash, pause, P?T (Pulse-to-tone) can be stored as a digit in memory

? Dialing rate (10, 20 ppS ) selected by bonding option

? On-hook debounce time: 150 msec.

? Minimum tone output duration: 93 msec.

? Minimum intertone pause: 93 msec.

? Flash break time (73, 100, 300, 600 msec.) selectable by keypad, and the pause time is 1 sec.

? On-chip power-on reset

? Uses 3.579545 MHz crystal or ceramic resonator

? Packaged in 18-pin plastic DIP