W91440N SERIES
10-MEMORY TONE/PULSE DIALER
WITH SAVE FUNCTION
Publication Release Date: May 1997
- 1 -
Revision A3
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, P
T (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
W91440N SERIES
- 2 -
PIN CONFIGURATION
C1
C2
C3
C4
SS
V
XT
XT
1
2
3
4
5
6
7
8
9
T/P MUTE
HKS
DTMF
MODE
R4
R3
R2
R1
VDD
DP
12
18
17
16
15
14
10
11
13
C5
PIN DESCRIPTION
SYMBOL
PIN
I/O
FUNCTION
Column-
Row
Inputs
1
-
5
&
15
-
18
I
The keyboard inputs may be used with either a standard 5
5
keyboard or an inexpensive single contact (Form A) keyboard.
Electronic input from a
C 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 V
SS
places the dialer in tone mode.
Pulling mode pin to V
DD
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).
W91440N SERIES
Publication Release Date: May 1997
- 3 -
Revision A3
Pin Description, continued
SYMBOL
PIN
I/O
FUNCTION
HKS
10
I
Hook switch input.
HKS = V
DD
: On-hook state. Chip in sleeping mode, no operation.
HKS = V
SS
: Off-hook state. Chip is enabled for normal operation.
HKS pin is pulled to V
DD
by internal resistor.
DP
11
O
N-channel open drain dialing pulse output.
Flash key will cause DP to be active in either tone mode or pulse
mode.
The timing diagram in pulse mode is shown in Figure 1(a, b, c).
V
DD
, V
SS
14, 6
I
Power input pins.
DTMF
12
O
In pulse mode, this pin remains in low state at all time.
In the tone mode, it will output a dual or single tone.
Detailed timing diagram for tone mode is shown in Figure 2(a, b, c).
Specified
Actual
Error %
Output Frequency
R1
R2
R3
R4
C1
C2
C3
697
770
852
941
1209
1336
1477
699
766
848
948
1216
1332
1472
+0.28
-0.52
-0.47
+0.74
+0.57
-0.30
-0.34
W91440N SERIES
- 4 -
BLOCK DIAGRAM
ROW
COLUMN
DTMF
XT
XT
MODE
RAM
COUNTER
SYSTEM CLOCK
GENERATOR
LOCATION
LATCH
D/A
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
READ/WRITE
(R1 to R4, Vx)
(C1 to C5)
T/P MUTE
CONTROL
LOGIC
PULSE
CONTROL
LOGIC
KEYBOARD
INTERFACE
CONVERTER
HKS
DP
FUNCTIONAL DESCRIPTION
Keyboard Operation
C1
C2
C3
C4
C5
1
2
3
S
R1
4
5
6
F4
R2
7
8
9
A
R3
/T
0
#
R/P
SAVE
R4
F1
F2
F3
VX
S: Store function key
A: Indirect repertory dialing function key
R/P: Redial and pause function key
SAVE: Save function key
/T:
in tone mode and P
T in pulse mode
F1, ..., F4: Flash keys, F1 = 600 mS, F2 = 300 mS, F3 = 73 mS, F4 = 100 mS
Note: D1, ..., Dn, D1', ..., Dn': 0, ..., 9, */T, #;Ln: 0, ..., 9; Fn: F1, ..., F4
W91440N SERIES
Publication Release Date: May 1997
- 5 -
Revision A3
Normal Dialing
OFF HOOK
,
D1
,
D2
, ...,
Dn
1. D1, D2,
...
, Dn will be dialed out.
2. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits in normal dialing.
Redialing
OFF HOOK
,
D1
,
D2
, ...,
Dn
Busy, Come
ON HOOK
,
OFF HOOK
,
R/P
1. The redial memory content will be dialed out.
2. The
R/P
key can execute the redial function only as the first key-in after off-hook; otherwise,
it executes pause function.
3. If redialing length oversteps 32 digits, the redialing function will be inhibited.
Number Store
OFF HOOK
,
D1
,
D2
, ...,
Dn
,
S
,
S
,
Ln
1. If the sequence of the dialed digits D1, D2, ..., Dn has not
finished,
S
will be ignored.
2. D1, D2, ..., Dn will be stored in memory location and dialed out.
OFF HOOK
,
S
,
D1
,
D2
, ...,
Dn
,
S
,
Ln
3. D1, D2, ..., Dn will be stored in memory location but will not be dialed out.
4.
R/P
and
*/T
keys can be stored as a digit in memory.
In store mode,
R/P
is the pause function key;
*/T
is the pulse to tone function key.
5. The store mode is released after the store function is executed or when the state of the hook
switch is changed.
Repertory Dialing
OFF HOOK
,
A
,
Ln
Access Pause
OFF HOOK
,
D1
,
D2
,
R/P
,
D3
, ...,
Dn
1. The pause function can be stored as a digit in memory.
2. The pause function is executed in normal dialing, redial dialing, or memory dialing.
3. A detailed timing diagram for the pause function is shown in Figure 3.
W91440N SERIES
- 6 -
Pulse-to-tone (*/T)
OFF HOOK
,
D1
,
D2
, ...,
Dn
,
*/T
,
D1'
,
D2'
, ...,
Dn'
1. If the mode switch is set in pulse mode, then the output signal will be:
D1, D2,
...
, Dn, Pause (3.6 sec.), D1', D2',
...
, Dn'
(Pulse)
(Tone )
2. If the mode switch is set in tone mode, then the output signal will be the form as follow:
D1, D2, ..., Dn, *, D1', D2', ..., Dn'
(Tone)
(Tone)
3. The dialer remains in tone mode when the digits have been dialed out and can be reset to pulse
mode by going on-hook.
4. The pulse-to-tone function timing diagram is shown in Figure 4.
Flash
OFF HOOK
,
Fn
1. Fn = F1,
...
, F4
2. The dialer will execute flash break time of 600 mS (F1), 300 mS (F2), 73 mS (F3), or 100 mS (F4)
and all the flash pause time is 1.0 sec. before the next digit is dialed out.
3. Flash key can be stored as a digit in memory; however, only one flash will be released to users.
4. The system will return to the initial state after the flash pause time is finished.
5. The timing diagram of flash function is shown in Figure 5.
Save
OFF HOOK
,
D1
,
D2
, ...,
Dn
,
SAVE
1. If the dialing
of
D1
to
Dn
is finished, pressing the
SAVE
key will cause D1 to Dn to
be copied to the save memory.
OFF HOOK
,
SAVE
2. D1 to Dn will be dialed out after the save key is pressed.
Cascaded Dialing
1.
Normal Dialing
+
Repertory Dialing
+
Normal Dialing
2.
Repertory Dialing
+
Normal Dialing
+
Repertory Dialing
3.
Redialing
+
Normal
Dialing
+
Repertory Dialing
4. Redialing is valid as first key-in only.
W91440N SERIES
Publication Release Date: May 1997
- 7 -
Revision A3
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATING
UNIT
DC Supply Voltage
V
DD
-
V
SS
-0.3 to +7.0
V
V
IL
V
SS
-
0.3
V
Input/Output Voltage
V
IH
V
DD
+0.3
V
V
OL
V
SS
-
0.3
V
V
OH
V
DD
+0.3
V
Power Dissipation
P
D
120
mW
Operation Temperature
T
OPR
-20 to +70
C
Storage Temperature
T
STG
-55 to +150
C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the
device.
DC CHARACTERISTICS
(V
DD
-
V
SS
= 2.5V, F
OSC.
= 3.579545 MHz, T
A
= 25
C, all outputs unloaded)
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX.
UNIT
Operating Voltage
V
DD
-
2.0
-
5.5
V
Operating Current
I
OP
Tone, Unloaded
-
0.4
0.60
mA
Pulse, Unloaded
-
0.2
0.40
Standby Current
I
SB
HKS = V
SS
, No load &
No key entry
-
-
15
A
Memory Retention
Current
I
MR
HKS = V
DD
,
V
DD
= 1.0V
-
-
0.2
A
DTMF Output Voltage
V
TO
Row group,
R
L
= 5 K
130
150
170
mVrms
Pre-emphasis
Col/Row,
V
DD
= 2.0 to 5.5V
1
2
3
dB
DTMF Distortion
THD
R
L
= 5 K
,
V
DD
= 2.0 to 5.5V
-
-30
-23
dB
DTMF Output DC Level
V
TDC
R
L
= 5 K
,
V
DD
= 2.0 to 5.5V
1.0
-
3.0
V
DTMF Output Sink
Current
I
TL
V
TO
= 0.5V
0.2
-
-
mA
W91440N SERIES
- 8 -
DC Characteristics, continued
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX.
UNIT
DP Output Sink Current
I
PL
V
PO
= 0.5V
0.5
-
-
mA
T/P MUTE Output Sink
Current
I
TML
V
TMO
= 0.5V
0.5
-
-
mA
Keypad Input Drive
Current
I
KD
V
I
= 0.0V
30
-
-
A
Keypad Input Sink
Current
I
KS
V
I
= 2.5V
200
400
-
A
HKS I/P Pull-High
Resistor
R
HK
-
-
300
-
K
Keypad Resistance
R
K
-
-
-
5.0
K
AC CHARACTERISTICS
(V
DD
-
V
SS
= 2.5V, F
OSC.
= 3.579545 MHz, T
A
= 25
C, all outputs unloaded)
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Key in Debounce
T
KID
-
-
20
-
mS
Key Release Debounce
T
KRD
-
-
20
-
mS
Pulse Mute Delay
T
MD
Mode = V
DD
-
40
-
mS
Mode = Floating
-
33.3
-
Pre-digit-pause
1
T
PDP1
Mode = V
DD
-
40
-
mS
10 ppS
Mode = Floating
-
33.3
-
Pre-digit-pause
2
T
PDP2
Mode = V
DD
-
20
-
mS
20 ppS
Mode = Floating
-
16.7
-
Interdigit Pause
T
IDP
10 ppS
-
800
-
mS
(Auto Dialing)
20 ppS
-
500
-
Make/Break Ratio
M:B
Mode = V
DD
-
40:60
-
%
Mode = Floating
-
33:67
-
Tone Output Duration
T
TD
Auto dialing
-
93
-
mS
Intertone Pause
T
ITP
Auto dialing
-
93
-
mS
Flash Break Time
T
FB
F1
-
600
-
F2
-
300
-
mS
F3
73
F4
-
100
-
W91440N SERIES
Publication Release Date: May 1997
- 9 -
Revision A3
AC Characteristics, continued
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Flash Pause Time
T
FP
F1, F2, F3, F4
-
1.0
-
S
Pause Time
T
P
-
3.6
-
S
On-hook Debounce
Time
T
OHD
-
150
-
S
Notes:
1. Crystal parameters suggested for proper operation are Rs < 100 ohms, Lm = 96 mH, Cm = 0.02 pF, Cn = 5 pF, Cl = 18 pF,
F
OSC
. = 3.579545 MHz
0.02%.
2. Crystal oscillator accuracy directly affects these times.
TIMING WAVEFORMS
T
IDP
HKS
KEY IN
DP
2
B
M
T
IDP
T
IDP
T
KID
T
IDP
T
PDP
2
M B
4
T
KRD
3
T
KID
DTMF
OSC.
Low
OSCILLATION
T
PDP
T/P MUTE
OSCILLATION
Figure 1(a) Normal Dialing Timing Diagram
W91440N SERIES
- 10 -
Timing Waveforms, continued
HKS
KEY IN
DP
T/P MUTE
R/P
T
KID
B
M
T
IDP
T
IDP
T
PDP
M B
DTMF
OSC.
Low
OSCILLATION
T
IDP
T
KRD
T<T
OHD
Figure 1(b) Pulse Mode Auto Dialing Timing Diagram
HKS
KEY IN
DP
T/P MUTE
R/P
T
KID
B
M
T
IDP
T
IDP
T
PDP
M B
DTMF
OSC.
Low
OSCILLATION
T
KRD
OHD
>
T
T
Figure 1(c) Pulse Mode Auto Dialing Timing Diagram
W91440N SERIES
Publication Release Date: May 1997
- 11 -
Revision A3
Timing Waveforms, continued
HKS
KEY IN
T/P MUTE
DTMF
5
4
3
T
TD
OSC.
OSCILLATION
2
T
ITP
T
ITP
T
KID
DP
High
T
ITP
OSCILLATION
T
KRD
Figure 2(a) Tone Mode Normal Dialing Timing Diagram
HKS
KEY IN
DTMF
R/P
T
KRD
OSC.
DP
OSCILLATION
T
TD
T
ITP
T
ITP
T
KID
High
T/P MUTE
T<T
OHD
Figure 2(b) Tone Mode Auto Dialing Timing Diagram
W91440N SERIES
- 12 -
Timing Waveforms, continued
HKS
KEY IN
DTMF
R/P
T
KRD
OSC.
DP
OSCILLATION
T
TD
T
ITP
T
KID
High
T/P MUTE
OHD
>
T
T
Figure 2(c) Tone Mode Auto Dialing Timing Diagram
HKS
KEY IN
DP
T/P MUTE
DTMF
OSC.
Low
OSCILLATION
2
T
KID
R/P
3
B
M
T
PDP
M
T
IDP
B
T
PDP
T
P
T
IDP
Figure 3. Pause Function Timing Diagram
W91440N SERIES
Publication Release Date: May 1997
- 13 -
Revision A3
Timing Waveforms, continued
HKS
KEY IN
DP
T/P MUTE
OSC.
OSCILLATION
2
T
KID
*/T
3
B
M
T
PDP
T
IDP
T
P
DTMF
T
ITP
Figure 4. Pulse-to-tone Timing Diagram
T/P MUTE
F
F
HKS
T
KID
DP
KEY IN
T
FP
T
FP
T
FB
3
Low
OSC.
OSCILLATION
DTMF
T
ITP
Figure 5. Flash Timing Diagram
W91440N SERIES
Publication Release Date: May 1997
- 15 -
Revision A3
Headquarters
No. 4, Creation Rd. III,
Science-Based Industrial Park,
Hsinchu, Taiwan
TEL: 886-3-5770066
FAX: 886-3-5792697
http://www.winbond.com.tw/
Voice & Fax-on-demand: 886-2-7197006
Taipei Office
11F, No. 115, Sec. 3, Min-Sheng East Rd.,
Taipei, Taiwan
TEL: 886-2-7190505
FAX: 886-2-7197502
Winbond Electronics (H.K.) Ltd.
Rm. 803, World Trade Square, Tower II,
123 Hoi Bun Rd., Kwun Tong,
Kowloon, Hong Kong
TEL: 852-27513100
FAX: 852-27552064
Winbond Electronics North America Corp.
Winbond Memory Lab.
Winbond Microelectronics Corp.
Winbond Systems Lab.
2730 Orchard Parkway, San Jose,
CA 95134, U.S.A.
TEL: 1-408-9436666
FAX: 1-408-9436668
Note: All data and specifications are subject to change without notice.
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