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 Winbonds 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 x 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

• 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