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 duratio...

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