W91570DN SERIES
23-MEMORY TONE/PULSE DIALER WITH
AUTOREDIAL RTC AND LCD DISPLAY FUNCTIONS
Publication Release Date: May 1997
- 1 -
Revision A2
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
×
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
•
The functions of the different dialers in the W91570DN series are shown in the following table:
PRODUCT NO.
LCD DIGITS
LOCK
RTC BATTERY
W91572DNF
16
√
1.5V
W91574DNF
16
√
3V
W91576DNF
12
√
1.5V
W91578DNF
12
√
3V
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