GENERAL DESCRIPTION

The W91570DN series ICs are Si-gate CMOS ICs that provide the signals needed for either pulse or tone dialing. They feature 23 number memories and a 16-digit LCD driver for displaying telephone numbers and calling time. A real time clock is included to display the time of day. The W91570DN series is fabricated using CMOS technology providing good performance in low voltage, low power applications.

FEATURES

• Three by 32 digits for redial, save and mercury memory

• Twenty by 16 digits for one-touch direct or two-touch indirect repertory memory

• Uses 6 x 10 keyboard

• Pause, Pulse-to-tone (*/T) and flash can be stored as a digit in memory

• Minimum tone output duration: 87 mS

• Minimum intertone pause: 87 mS

• Tone/Pulse mode pin selectable

• Make/Break ratio pin selectable

• Dialing rate (10 or 20 ppS) pin selectable

• Pause time (2.0 or 3.6 Sec) selectable by keypad

• Flash break time (100, 300, or 600 mS) selectable by keypad

• Built-in 12 or 16-digit LCD driver (1/4 duty, 1/3 bias) selectable by mask option

• Built-in calling timer from [00:00] to [59:59]

• Uses 3.579545 MHz TV quartz crystal or ceramic resonator

• Uses 32768 Hz crystal as RTC frequency base

• Packaged in 80-pin plastic QFP with RTC

• Provides one-key-redial and auto-redial functions

• Switchable 24-hour clock or 12-hour clock with p.m. mode

• 0 or 9 dialing inhibition pin for PABX systems or long distance dialing lock out

• On-hook debounce: 150 msec in normal mode and 20 msec in lock mode

• Off-hook delay 300 mS in lock mode (i.e. DP will keep low for 300 mS while off hook)

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

• MUTE key for speech mute

• Cascade and mixed dialing allowed