W91472N SERIES

6-MEMORY TONE/PULSE DIALER WITH

SAVE AND HANDFREE FUNCTIONS

Publication Release Date: May 1997

- 1 -

Revision A2

GENERAL DESCRIPTION

The W91472N series are tone/pulse switchable telephone dialers with five memories, save memory,
and handfree dialing control. These chips are fabricated using Winbond's high-performance CMOS
technology and thus offer good performance in low-voltage and low-power operations.

FEATURES

DTMF/pulse switchable dialer

Two by 32 digit redial and save memory

Five by 16 digit one-touch direct repertory memory

Pulse-to-tone (*/T) keypad for long distance call operation

Cascaded dialing

Uses 5

6 keyboard

Easy operation with redial, flash, pause, and */T keypads

Pause, P

T (pulse-to-tone) can be stored as a digit in memory

Dialing rate (10 ppS or 20 ppS) selectable by bonding option

On-hook debounce time: 150 mS

Minimum tone output duration: 93 mS

Minimum intertone pause: 93 mS

Pause time: 3.6 sec.

Flash break time (73 mS, 100 mS, 300 mS, or 600 mS) selectable by keypad; pause time is 1.0S

Make/break ratio (40:60 or 33.3:66.7) selectable by MODE pin

On-chip power-on reset

Uses 3.579545 MHz crystal or ceramic resonator

18 or 20-pin dual-in-line plastic package

The different dialers in the W91472N series are shown in the following table:

TYPE NO.

REPLACEMENT

TYPE NO.

PULSE

(ppS)

FLASH

(mS)

M/B

KEY

TONE

HANDFREE

DIALING

PACKAGE

(PINS)

W91472N

W91472

600/300/73/100

W91472AN

W91472A

600/300/73/100

Yes

W91472BN

W91472B

600/300/73/100

W91472CN

W91472C

600/300/73/100

Yes

W91472N SERIES

- 2 -

PIN CONFIGURATIONS

T/P MUTE

DTMF

DP/C6

MODE

HKS

W91472N/472BN

T/P MUTE

HFI

W91472AN/472CN

MODE

DTMF

HKS

HFO

DP/C6

PIN DESCRIPTION

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

Column-

Row Inputs

The keyboard input is compatible with a standard 5 x 6
keyboard, an inexpensive single contact (Form A)
keyboard, and electronic input.

In normal operation, any single button can be pushed to
produce dual tone, pulses, or function. Activation of two
or more buttons will result in no response except for
single tone.

A built-in inverter provides oscillation with an
inexpensive 3.579545 MHz crystal. The oscillator
ceases when a keypad input is not sensed. The crystal
frequency deviation is 0.02%.

Crystal oscillator output pin.

T/P MUTE

The T/P MUTE is a conventional CMOS N-channel
open drain output.

The output transistor is switched on low level during
dialing sequence (both pulse and tone mode).
Otherwise, it is switched off.

W91472N SERIES

Publication Release Date: May 1997

- 3 -

Revision A2

Pin Description, continued

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

MODE

Pulling mode pin to V

places dialer in tone mode.

Pulling mode pin to V

places dialer in pulse mode

with M/B ratio of 40:60 (10 ppS, except for
91472BN/472CN = 20 ppS).

Leaving mode pin floating places dialer in pulse mode
with M/B ratio of 33.3:66.7 (10 ppS, except for
W91472BN/472CN = 20 ppS).

HKS

The HKS input is used to sense whether the handset is
on-hook or off-hook.

In on-hook state, HKS = 1: chip is in sleeping mode, no
operation.

In off-hook state, HKS = 0: chip is enabled for normal
operation.

HKS pin is pulled to V

by internal resistor.

DP / C6

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 for pulse mode is shown in Figure 1
(a, b, c, d).

DTMF

During pulse dialing, this pin remains in low state
regardless of keypad input. In the tone mode, it will
output a dual or single tone.
A detailed timing diagram for tone mode is shown in
Figure 2 (a, b, c, d).

Specified

697

770

852

941

1209

1336

1477

699

766

848

948

1216

1332

1472

Actual

+0.28

-0.52

-0.47

+0.74

+0.57

-0.30

-0.34

Error %

OUTPUT FREQUENCY

, V

14, 6

16, 6

Power input pins for the dialer chip. V

is the main

power and V

is the ground.

W91472N SERIES

- 4 -

Pin Description, continued

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

HFI,

HFO

10, 11

I, O

Handfree control pins.

A low pulse on the HFI input pin toggles the handfree
control state.
Status of the handfree control state is listed in the
following table:

HOOK SW.

On Hook

Off Hook

On Hook

Off Hook

CURRENT STATE

NEXT STATE

HFO

Low

High

Low

High

INPUT

HFI

Off Hook

On Hook

HFO

High

Low

High

DIALING

Yes

HFI pin is pulled to V

by an internal resistor.

Detailed timing diagram is shown in Figure 3.

BLOCK DIAGRAM

ROW

COLUMN

DTMF

HKS

MODE

RAM

COUNTER

SYSTEM CLOCK

GENERATOR

LOCATION

LATCH

D/A

ROW & COLUMN

PROGRAMMABLE
COUNTER

DATA LATCH
& DECODER

READ/WRITE

HFI

(R1 to R4, Vx)

(C1 to C5)

T/P MUTE

HFO

CONTROL

LOGIC

PULSE

CONTROL

LOGIC

KEYBOARD

INTERFACE

CONVERTER

DP/C6

W91472N SERIES

Publication Release Date: May 1997

- 5 -

Revision A2

FUNCTIONAL DESCRIPTION

DP /

*/T

R/P

SAVE

S: Store function key

R/P: Redial and pause function key

*/T: * in tone mode and P

T key in pulse mode

SAVE: Save function key for one-touch 32-digit memory

M1, ..., M5: One-touch memory

F1, ..., F4: Flash function keys: F1 = 600 mS, F2 = 300 mS, F3 = 73 mS, F4 = 100 mS, and all

flash

pause time is 1.0 mS

Note: Mn = M1 , ..., M5; Dn = 0, ..., 9, */T, #, Pause.

Normal Dialing

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

1. D1, D2, ..., Dn will be dialed out.

2. Dialing length is unlimited, but redial is inhibited if length exceeds 32 digits in nomal dialing.

Redialing

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

Busy, Come

ON HOOK

OFF HOOK

(or

ON HOOK

HFI

¡õ

R/P

1. The redial memory content will be D1, D2, ..., Dn.

2. The

R/P

key can execute the redial function only as first key-in after off-hook. Otherwise, it
will

execute the pause function.

W91472N SERIES

- 6 -

Number Store

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

a. If the sequence of the dialed digits D1, D2, ..., Dn has not
finished,

will be ignored.

b. D1, D2, ..., Dn will be dialed out and stored in memory location Mn.

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

a. D1, D2, ..., Dn will be stored in memory location Mn but will not be dialed out.

R/P

and

*/T

keys can be stored as a digit in memory, but

R/P

key cannot be the first

digit. In store
mode,

R/P

is the pause function key.

c. The store mode is released after the store function is executed or when the state of the hook switch

changes or the flash function is executed.

Save

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

SAVE

a. D1, D2, ..., Dn will be dialed out.

b. If the dialing
of

is finished, pressing

SAVE

will cause D1 to Dn to be

duplicated to save memory.

ON HOOK

OFF HOOK

(or

HFI

¡õ

SAVE

D1 to Dn will be dialed out after the

SAVE

key is pressed.

Repertory Dialing

OFF HOOK

(or

ON HOOK

HFI

¡õ

(or

SAVE

)

The content of memory location Mn (or save) will be dialed out.

Access Pause

OFF HOOK

(or

ON HOOK

HFI

¡õ

R/P

, ...,

1. The pause function can be stored as a digit in memory.

2. The pause function is executed in normal dialing or redialing or memory dialing.

3. The pause function timing diagram is shown in Figure 4.

W91472N SERIES

Publication Release Date: May 1997

- 7 -

Revision A2

Pulse-to-Tone (*/T)

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

*/T

D1'

D2'

, ...,

Dn'

1. If the mode switch is set to pulse mode, then the output signal will be:

D1, D2, ..., Dn, Pause, D1', D2', ..., Dn'
(Pulse)

(Tone)

2. If the mode switch is set to tone mode, then the output signal will be:

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 only by going on-hook.

4. The function timing diagram is shown in Figure 5.

Flash

OFF HOOK

(or

ON HOOK

HFI

¡õ

1. Fn = F1, ..., F4.

2. If

is pressed, the dialer will execute flash break time of 600 mS (F1), 300 mS (F2),

73 mS (F3), or 100 mS (F4). The pause time is 1.0 second.

3. Flash key cannot be stored as a digit in memory. The flash key has first priority among keyboard

functions.

4. The system will return to the initial state after the flash pause time is finished.

5. The flash function timing diagram is shown in Figure 6.

Cascaded Dialing

OFF HOOK

(or

ON HOOK

HFI

¡õ

Normal dialing

Repertory dialing

Normal dialing

(1st sequence)

(2nd sequence)

Repertory dialing

Normal dialing

Repertory dialing

(1st sequence)

(2nd sequence)

Redialing

Normal dialing

Repertory dialing

(1st sequence)

(2nd sequence)

Redialing and save dialing is valid only as the first key-in.

W91472N SERIES

- 8 -

ABSOLUTE MAXIMUM RATINGS

PARAMETER

SYMBOL

RATING

UNIT

DC Supply Voltage

-0.3 to +7.0

Input/Output Voltage

-0.3

+0.3

-0.3

+0.3

Power Dissipation

120

Operating Temperature

OPR

-20 to +70

Storage Temperature

STG

-55 to +150

Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the
device.

DC CHARACTERISTICS

-V

= 2.5V, Fosc. = 3.58 MHz, T

= 25

C, All outputs unloaded)

PARAMETER

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Operating Voltage

2.0

5.5

Operating Current

Tone

0.40

0.60

Pulse

0.20

0.40

Standby Current

HKS = 0, No load &
No key entry

Memory Retention
Current

HKS = 1, V

= 1.0V

0.2

Tone Output Voltage

Row group, R

= 5 K

130

150

170

mVrm

Pre-emphasis

Col/Row, V

= 2.0 to

5.5V

DTMF Distortion

THD

= 5 K

, V

= 2.0 to

5.5V

-30

-23

DTMF Output DC
Level

TDC

= 5 K

, V

= 2.0 to

5.5V

1.0

3.0

DTMF Output Sink
Current

= 0.5V

0.2

DP Output Sink
Current

= 0.5V

0.5

W91472N SERIES

Publication Release Date: May 1997

- 9 -

Revision A2

DC Characteristics, continued

PARAMETER

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNIT

T/P MUTE Output
Sink Current

= 0.5V

0.5

HFO Drive/Sink

HFH

= 2.0V

0.5

Current

HFL

= 0.5V

0.5

Keypad Input Drive
Current

= 0V

Keypad Input Sink
Current

= 2.5V

200

400

Keypad Resistance

5.0

AC CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Key-in Debounce

KID

Key Release Debounce

KRD

On-hook Debounce

OHD

150

Pre-digit Pause

PDP1

Mode Pin = V

10 ppS

Mode Pin = Floating

33.3

Pre-digit Pause

PDP2

Mode Pin = V

20 ppS

Mode Pin = Floating

16.7

Interdigit Pause

IDP

10 ppS

800

(Auto dialing)

20 ppS

500

Make/Break Ratio

M:B

Mode Pin = V

40:60

Mode Pin = Floating

33.3:66.7

Tone Output Duration

Intertone Pause

ITP

Flash Break Time

600

300

100

Flash Pause Time

1.0

Pause Time

3.6

Notes:

1. Crystal parameters suggested for proper operation are Rs < 100

, Lm = 96 mH, Cm = 0.02 pF, Cn = 5 pF, Cl = 18 pF,

OSC

. = 3.579545 MHz

0.02%.

2. Crystal oscillator accuracy directly affects these times.

W91472N SERIES

- 10 -

TIMING WAVEFORMS

IDP

HKS

KEY IN

T/P MUTE

IDP

KID

IDP

PDP

M B

KRD

KID

DTMF

OSC.

Low

OSCILLATION

PDP

Figure 1(a). Normal Dialing Timing Diagram

HKS

KEY IN

T/P MUTE

R/P

KID

IDP

PDP

M B

DTMF

OSC.

Low

OSCILLATION

IDP

KRD

T < T

OHD

Figure 1(b). Pulse Mode Auto Dialing Timing Diagram

W91472N SERIES

Publication Release Date: May 1997

- 11 -

Revision A2

Timing Waveforms, continued

HKS

KEY IN

T/P MUTE

R/P

KID

IDP

PDP

M B

DTMF

OSC.

Low

OSCILLATION

KRD

T > T

OHD

Figure 1(c). Pulse Mode Auto Dialing Timing Diagram

HKS

KEY IN

T/P MUTE

DTMF

OSC.

OSCILLATION

ITP

KID

High

ITP

OSCILLATION

KRD

Figure 2(a). Tone Mode Normal Dialing Timing Diagram

W91472N SERIES

Publication Release Date: May 1997

- 13 -

Revision A2

Timing Waveforms, continued

HKS

KEY IN

DTMF

OSC.

OSCILLATION

KID

*/T

PDP

IDP

ITP

T/P MUTE

Figure 5. Pulse-to-Tone Timing Diagram

HKS

KID

DTMF

OSC.

KEY IN

Low

KID

ITP

OSCILLATION

HFI

HFO

T/P MUTE

Figure 6. Flash Timing Diagram

W91472N SERIES

- 14 -

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: 852-27516023
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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