GENERAL DESCRIPTION

The W91550DN series are Si-gate CMOS IC tone/pulse switchable dialers containing 13 number memories and a 10-digit LCD driver for displaying telephone numbers and calling time, including a 16-digit ′ 3 one-touch memory, 16-digit ′ 10 two-touch memory dialing, and 32-digit ′ 2 redial and save memory. These dialers also provide a secrecy key, flash, two-way handfree dialing, one-key redial, hold and lock functions.

FEATURES

? Tone/pulse switchable dialer

? Two by 32-digit redial and save memory (or mercury memory)

? Three by 16-digit one-touch direct repertory memory

? Ten by 16-digit two-touch indirect repertory memory

? Memory check function

? Save/mercury function selected by pin option

? Typical interdigit pause (IDP): 800 msec (10 ppS) in pulse mode

? Uses 4 ′ 7 keyboard

? Mute key for secrecy control

? Minimum tone output duration/inter-tone pause: 87/87 mS

? Flash pause time: 1.2 sec.

? Flash break time (98, 300, 600 msec) selectable by keypad

? Pause time (2.0, 3.6, 4.0 sec.) selectable by mask option

? Pulse-to-tone (*/T) keypad for long distance call operation

? 0 or 9 dialing inhibition pin for PABX system or long distance dialing lock out

? Make/break ratio selected by pin option

? Built-in 10-digit LCD driver for telephone number display and calling time (1/3 duty, 1/2 bias)

? Built-in calling time from (00:00) to (59:59)

? On-chip power-on reset and clear LCD

? On hook debounce: 250 msec in normal mode (20 msec in lock mode)

? First key-in delay: 300 msec in lock mode

? Uses 3.579545 MHz crystal or ceramic resonator

? Packaged in 64-pin QFP