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W91440N Datasheet Preview

W91440N Datasheet

10-MEMORY TONE/PULSE DIALER

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W91440N SERIES
10-MEMORY TONE/PULSE DIALER
WITH SAVE FUNCTION
GENERAL DESCRIPTION
The W91440N series are Si-gate CMOS ICs that provide the necessary signals for either tone or
pulse dialing. The W91440N series features save memory and a 10 by 16 digit automatic dialing
memory.
FEATURES
DTMF/pulse switchable dialer
Two by 32 digit redial and save memory
Ten by 16 digit two-touch direct memory
Redial memory cascadable with normal dialing; dialing length is unlimited, but if length
oversteps 32 digits the redial function is inhibited
Pulse-to-tone (*/T) keypad for long distance call operation
Uses 5 × 5 keyboard
Easy operation with redial, flash, pause and */T keypads
Flash, pause, PT (Pulse-to-tone) can be stored as a digit in memory
Dialing rate (10, 20 ppS ) selected by bonding option
On-hook debounce time: 150 msec.
Minimum tone output duration: 93 msec.
Minimum intertone pause: 93 msec.
Flash break time (73, 100, 300, 600 msec.) selectable by keypad, and the pause time is 1 sec.
On-chip power-on reset
Uses 3.579545 MHz crystal or ceramic resonator
Packaged in 18-pin plastic DIP
The different dialers in the W91440N series are shown in the following table:
TYPE NO.
REPLACEMENT
TYPE NO.
PULSE
(ppS)
FLASH
(mS)
PAUSE
(S)
M/B
W91442N
W91442
10 600/300/73/100
3.6 Pin
W91443
W91444
W91446
W91447
W91444G
W91445G
W91443N
W91443
20 600/300/73/100
3.6 Pin
Publication Release Date: May 1997
- 1 - Revision A3




Winbond

W91440N Datasheet Preview

W91440N Datasheet

10-MEMORY TONE/PULSE DIALER

No Preview Available !

PIN CONFIGURATION
W91440N SERIES
C1
C2
C3
C4
C5
VSS
XT
XT
T/P MUTE
1
2
3
4
5
6
7
8
9
18 R4
17 R3
16 R2
15 R1
14 VDD
13 MODE
12 DTMF
11 DP
10 HKS
PIN DESCRIPTION
SYMBOL PIN I/O
FUNCTION
Column-
Row
Inputs
15
&
1518
The keyboard inputs may be used with either a standard 5 × 5
I keyboard or an inexpensive single contact (Form A) keyboard.
Electronic input from a µC can also be used.
A valid key in is defined as a single row being connected to a single
column.
XT, XT
7, 8 I, O A built-in inverter provides oscillation with an inexpensive 3.579545
MHz crystal or ceramic resonator.
T/P
MUTE
9 O The T/P MUTE is a conventional CMOS N-channel open drain output.
The output transistor is switched on during dialing sequence and flash
break time. Otherwise, it is switched off.
MODE 13 I Pulling mode pin to VSS places the dialer in tone mode.
Pulling mode pin to VDD places the dialer in pulse mode with M/B ratio
40:60 (10 ppS only for W91442N and 20 ppS for W91443N).
Floating mode pin places the dialer in pulse mode with M/B ratio 33:67
(10 ppS only for W91442N and 20 ppS for W91443N).
-2-


Part Number W91440N
Description 10-MEMORY TONE/PULSE DIALER
Maker Winbond
Total Page 14 Pages
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