GENERAL DESCRIPTION
The W91540N series are tone/pulse switchable telephone dialers with 10 memories, keytone or lock function, and handfree dialing control. These chips are fabricated using Winbond's high-performance CMOS technology and thus offer good performance in low-voltage and low-power operations.

FEATURES
· DTMF/pulse switchable dialer
· Two by 32-digit redial and save memory
· Ten by 16 digit two-touch indirect 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＆#174;T (pulse-to-tone) can be stored as a digit in memory
· 0 or 9 dialing inhibition pin for PABX system or long distance dialing lock out
· Dialing rate (10 ppS or 20 ppS) selected by bonding option
· Minimum tone output duration: 93 mS (W91544AN: 87 mS)
· Minimum intertone pause: 93 mS (W91544AN: 87 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 1.0 S
· Make/break ratio (2:3 or 1:2) 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
· Packaged in 18 or 20-pin DIP