GENERAL DESCRIPTION
The W91560N series are tone/pulse switchable telephone dialers with three memories, keytone or lock, and handfree dialing control. These chips are fabricated using Winbonds high-performance CMOS technology and thus offer good performance in low-voltage, low-power operations.

FEATURES
• DTMF/pulse switchable dialer
• Two by 32 digit redial and save memory
• Three by 16 digit one-touch direct repertory memory
• Pulse-to-tone (*/T) keypad for long distance call operation
• Cascaded dialing
• Uses 5 ´ 5 keyboard
• Easy operation with redial, flash, pause, and */T keypads
• Pause, P®T (pulse-to-tone) can be stored as a digit in memory
• On-hook debounce time: 150 mS (Unlock Mode), 200 mS (Lock Mode)
• 0 or 9 dialing inhibition pin for PABX system or long distance dialing lock out
• Dialing rate (10 ppS or 20 ppS) selectable by bonding option
• Minimum tone output duration: 93 mS
• Minimum intertone pause: 93 mS
• Pause time: 3.6 sec.
• 300 mS off-hook delay in lock mode (DP remains low for 300 mS while off hook)
• Flash break time (73 mS, 100 mS, 300 mS, or 600 mS) selectable by keypad; pause time is 1.0S
• Make/break ratio (40:60 or 33.3:66.7) selectable by MODE pin
• Key tone output for valid keypad entry recognition
• On-chip power-on reset
• Uses 3.579545 MHz crystal or ceramic resonator
• 18 or 20-pin dual-in-line plastic package