Winbond Electronics W91443N, W91442N Datasheet

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, 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

Publication Release Date: May 1997

- 1 - Revision A3

PIN CONFIGURATION

XT

XT1234

7

8

9

HKS

DTMF

MODE

R4

R3

R2

R1

12

18

16

15

14

101113

XT

MUTE

MUTE

W91440N SERIES

C1
C2
C3
C4

C5

V

SS

T/P MUTE

5
6

17

V

DP

DD

PIN DESCRIPTION

SYMBOL PIN I/O FUNCTION

Column-

Row

Inputs

1−5

&

15−18

The keyboard inputs may be used with either a standard 5 × 5
keyboard or an inexpensive single contact (Form A) keyboard.

I

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,

7, 8 I, O A built-in inverter provides oscillation with an inexpensive 3.579545

MHz crystal or ceramic resonator.

T/P

9 O

The T/P

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 -

W91440N SERIES

HKS

HKS

HKS

HKS

DP

R1R2R3

R4

C1

C2

C3

Pin Description, continued

SYMBOL PIN I/O FUNCTION

10 I Hook switch input.

= VDD: On-hook state. Chip in sleeping mode, no operation.
= VSS: Off-hook state. Chip is enabled for normal operation.
pin is pulled to VDD by internal resistor.

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).

VDD, VSS 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).

Output Frequency

Specified Actual Error %

697
770

699
766

+0.28

-0.52

852

941
1209
1336
1477

848
948

1216
1332
1472

-0.47

+0.74

+0.57

-0.30

-0.34

Publication Release Date: May 1997

- 3 - Revision A3

BLOCK DIAGRAM

W91440N SERIES

XT XT

ROW

(R1 to R4, Vx)

COLUMN

(C1 to C5)

DTMF

KEYBOARD

INTERFACE

D/A

CONVERTER

FUNCTIONAL DESCRIPTION

Keyboard Operation

C1 C2 C3 C4 C5

LOCATION
LATCH

ROW & COLUMN
PROGRAMMABLE
COUNTER

READ/WRITE

COUNTER

RAM

DATA LATCH

& DECODER

SYSTEM CLOCK
GENERATOR

CONTROL
LOGIC

PULSE
CONTROL
LOGIC

HKS

MODE

T/P MUTE

DP

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

- 4 -

W91440N SERIES

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,

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.

S will be ignored.

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.

Publication Release Date: May 1997

- 5 - Revision A3