W91820N SERIES 13-MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS GENERAL DESCRIPTION The W91820N is a series of tone/pulse switchable telephone dialers with 13 memory, keytone, hold, lock, and handfree dialing control features.
These chips are fabricated using Winbond's highperformance CMOS technology and thus offer good performance in low-voltage, low-power operations.
FEATURES • • • • • • • • • • • • • • • • • • • • • • Tone/pulse switchable dialer Two by 32 digits redial and save memory Three by 32 digits one-touch direct repertory memory Ten by 32 digits two-touch indirect repertory memory Pulse-to-tone (*/T) keypad for long distance call operation Chain dialing Uses 5...

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