W91521N - Winbond

W91521N TONE/PULSE DIALER

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 keybo.

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 .