W91473 SERIES

14-MEMORY TONE/PULSE SWITCHABLE DIALER

WITH HANDFREE AND LOCK FUNCTIONS

Publication Release Date: February 1995

- 1 -

Revision A3

GENERAL DESCRIPTION

The W91473 series are Si-gate CMOS IC tone/pulse switchable dialers containing a 14-channel
automatic dialing memory, including a 16-digit

3 emergency dialing memory and a 16-digit

channel repertory memory that provides a 32-digit mercury memory. These dialers also provide flash,
clear, hold, lock, and one-key redial functions.

FEATURES

DTMF/Pulse switchable dialer

32-digit LNB (last number buffer) memory

32-digit mercury memory

16-digit

3 one-touch direct repertory memory

16-digit

10 direct repertory memory

Uses 7

5 keyboard

Flash time: 98 mS, 305 mS, or 600 mS (selectable by keypad option)

Minimum tone output duration: 93 mS

Minimum intertone pause: 93 mS

On-chip power-on reset

Uses 3.579545 MHz crystal or ceramic resonator

Packaged in 22, 24, or 28-pin plastic DIP

The different dialers in the W91473 series are shown in the following table:

TYPE NO.

PULSE

(ppS)

MEMORY

MERCURY

MEMORY

HOLD

HANDFREE

LOCK

PACKAGE

W91473

Yes

W91473L

Yes

W91473A

Yes

W91473AL

Yes

W91473B

10/20

Yes

W91473BL

10/20

Yes

W91473C

10/20

Save Memory

Yes

W91473CL

10/20

Save Memory

Yes

W91473D

Save Memory

W91473DL

Save Memory

Yes

W91473 SERIES

- 2 -

PIN CONFIGURATIONS

HPM MUTE

MODE

DTMF

HKS

T/P MUTE

HPM MUTE

MODE

DTMF

HKS

HFO

HFI

MODE

DTMF

HKS

HFO

HFI

DRS

HPM MUTE

LOCK

MODE

DTMF

HKS

T/P MUTE

LOCK

MODE

DTMF

HKS

T/P MUTE

HFO

HFI

LOCK

MODE

DTMF

HKS

T/P MUTE

HFO

HFI

DRS

HPM MUTE

W91473/D

T/P MUTE

W91473A

T/P MUTE

W91473B/C

W91473L/DL

W91473AL

W91473BL/CL

W91473 SERIES

Publication Release Date: February 1995

- 3 -

Revision A3

PIN DESCRIPTION

SYMBOL

22-PIN

24-PIN

28-PIN

I/O

FUNCTION

Column-

Row

Inputs

The keyboard input may be used with
either the standard 7

5 keyboard or an

inexpensive single contact (form A)
keyboard. Electronic input with

C can

also be used.
A valid key entry is defined by a single
row being connected to a single column.

XT, XT

9, 10

11, 12

I, O

A built-in inverter provides oscillation with
an inexpensive 3.579545 MHz crystal or
ceramic resonator.

T/P

MUTE

The T/P MUTE is a conventional CMOS
N-channel open drain output. The output
transistor is switched on during pulse and
tone mode dialing sequence and flash
break. Otherwise, it is switched off.

N-channel open drain dialing pulse output
(Figure 1).

Flash key causes DP to go active when in
pulse mode and tone mode.

MODE

Pulling mode pin to V

places the dialer

in tone mode.
Pulling mode pin to V

places the dialer

in pulse mode (10 ppS, M/B = 2:3).
Leaving mode pin floating places the
dialer in pulse mode (10 ppS, M/B = 1:2).

HKS

Hook switch input.

HKS = 1: On-hook state. Chip in sleep
mode, no operation.

HKS = 0: Off-hook state. Chip enabled for
normal operation.

HKS pin is pulled to V

by internal

resistor.

W91473 SERIES

- 4 -

Pin Description, continued

SYMBOL

22-PIN

24-PIN

28-PIN

I/O

FUNCTION

HPM

MUTE

(only for

W91473/D

)

(only for

W91473A)

The HPM MUTE is a conventional
inverter output.
During pulse dialing, flash, hold, and
mercury mute functions, this pin will
output an active high.
It remains in a low state at all other times.

8, 22

(W91473

B/C)

No connection.

LOCK

(W91473L

/DL)

(W91473

AL)

(W91473

BL/CL)

The function of the LOCK pin is shown
below:

LOCK PIN

FUNCTION

Floating

"0," " 9" dialing inhibited

Normal dialing

"0" dialing inhibited

DTMF

In pulse mode, remains in low state at all
times. In tone mode, outputs a dual or
single tone.
Detailed timing diagram for tone mode is
shown in Figure 2.

OUTPUT FREQUENCY

Specified

Actual

Error %

697

699

+0.28

770

766

-0.52

852

848

-0.47

941

948

+0.74

1209

1216

+0.57

1336

1332

-0.30

1477

1472

-0.34

, V

16, 8

1, 8

20, 10

Power input pins.

W91473 SERIES

Publication Release Date: February 1995

- 5 -

Revision A3

Pin Description, continued

SYMBOL

22-PIN

24-PIN

28-PIN

I/O

FUNCTION

HFI, HFO

12, 13

14, 15

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:

CURRENT STATE

NEXT STATE

Hook Sw.

HFO

Input

HFO

Dialing

High

Yes

Low

HFI

¡õ

Low

Yes

Off Hook

On Hook

Low

On Hook

Off Hook

High

Yes

On Hook

Off Hook

On Hook

High

Low

HFI

¡õ

High

Low

Yes

Off Hook

HFI

¡õ

The HFI pin is pulled to V

by an

internal resistor.

Keytone signal output. The keytone will
be generated in all valid keys are pressed
in tone mode. Frequency is 600 Hz and
duration is 35 mS.

DRS

Dial rate selection. This pin is pulled to
V

by an internal resistor.

DRS MODE

PIN

TONE/PULSE

Floating

Pulse

Tone

Floating

DIAL

RATE M/B

10 ppS

20 ppS

2:3

1:2

W91473 SERIES

- 6 -

BLOCK DIAGRAM

HKS

COLUMN

ROW

DTMF

READ/WRITE
COUNTER

RAM

LOCATION
LATCH

D/A CONVERTER

T/P MUTE

MODE

HFO

LOCK

HFI

DRS

(R1 to R5)

K
E
Y
B
O
A
R
D

I
N
T
E
R
F
A
C
E

(C1 to C7)

ROW & COLUMN
PROGRAMMABLE
COUNTER

DATA LATCH
& DECODER

C
O
N
T
R
O
L

L
O
G
I
C

P
U
L
S
E

C
O
N
T
R
O
L

L
O
G
I
C

XT XT

SYSTEM CLOCK
GENERATOR

HPM MUTE

FUNCTIONAL DESCRIPTION

Keyboard Operation

M00

M05

EM1

M01

M06

EM2

CLR

M02

M07

EM3

*/T

R/P

M03

M08

M04

M09

*MER

Note:

*MER

location in W91473C/CL or W91473D/DL is SAVE memory.

S: Store function key

W91473 SERIES

Publication Release Date: February 1995

- 7 -

Revision A3

F1, F2, F3: Flash keys

R: One-key redial

H: Hold function key

M0j: Direct repertory memory

EMi: One-touch memory for emergency call

*/T: * & P

CLR: Clear key

R/P: Redial and pause function key

MER: One-touch memory for mercury code dialing

Note: Dn = 0 to 9, *, #, M0j = M00 to M09 (j = 0 to 9).

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 oversteps 32 digits.

Redialing

OFF HOOK

, ...,

BUSY, Come

ON HOOK

OFF HOOK

(or

ON HOOK

HFI

¡õ

R/P

ON HOOK

HFI

¡õ

, ...,

BUSY,

HFI

¡õ

Come

HFI

¡õ

R/P

The

R/P

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

execute pause function.

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

a. The one-key redial function timing diagram is shown in Figure 4.

b. If dialing
of

is completed, pressing the

key will cause the pulse output pin

to go low for 2.2 seconds. Break time and a 600 mS pause will automatically be added.

c. If the

key is pressed before the pulses for the number dialed out are completed, it will be

ignored.

W91473 SERIES

- 8 -

Number Store

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

Moj

(or

EMi

MER

)

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

R/P

and

*/T

keys can be stored as a digit in memory. In store mode,

R/P

is the pause

function key.

The store mode can be released after the store function is executed or the state of the hook switch
is changed.

, ...,

D1, D2, ..., Dn will be stored in memory location M0j and will not be dialed out.

OFFHOOK

(or

ON HOOK

HFI

¡õ

, ...,

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

b. The

key must be pressed after completion of the dialing sequence.

, ...,

D1, D2, ..., Dn will be stored in memory location M0j and will be dialed out.

Repertory Dialing

OFF HOOK

(or

ON HOOK

HFI

¡õ

Moj

(or

EMi

MER

)

Access Pause

OFF HOOK

(or

ON HOOK

HFI

¡õ

R/P

, ...,

1. The pause function can be stored in memory.

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

3. The pause function timing diagram is shown in Figure 5.

W91473 SERIES

Publication Release Date: February 1995

- 9 -

Revision A3

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 (3.6s), 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) (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 P

T function timing diagram is shown in Figure 6.

5. */ T key cannot be stored as a digit in memory.

Save

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

SAVE

D1, D2, ..., Dn, will be stored in SAVE memory but will not be dialed out.

OFFHOOK

(or

ON HOOK

HFI

¡õ

, ...,

SAVE

D1, D2, ...,

, will be stored in SAVE memory and will be dialed out.

OFF HOOK

(or

ON HOOK

HFI

¡õ

SAVE

The content of SAVE memory will be dialed out.

Flash (F = F1, F2, F3)

OFF HOOK

(or

ON HOOK

HFI

¡õ

1. Flash key cannot be stored as a digit in memory and it has first priority among keyboard functions.

2. The system will return to the initial state after the break time is finished.

3. The flash function timing diagram is shown in Figure 7.

W91473 SERIES

- 10 -

Clear key

CLR

R/P

(or

)

Redial and one-key redial buffer will be cleared.

CLR

Moj

Location M0j buffer content will be cleared.

CLR

Location M0j buffer content will be cleared.

CHAIN DIALING

Relationship between the memory and the chain dialing buffer:

Memory

Digit

¡G
¡G

¡G

Location

M00

M01

¡G

M08

M09

EM1

EM2

EM3

Normal Dialing

Chain Dialing Buffer

Section 1

Section 2

Section 3

Section 4

The chain dialing buffer may be divided into four sections, allowing up to four numbers to be dialed
out in sequence. For example, if the user enters M01, M03, EM1, and normal dialing (manual dialing),
the content of sections 1 to 4 will be M01, M03, EM1, and normal dialing (manual dialing). When
numbers are entered into the chain dialing buffer, there is no need to wait until the previous dialing
sequence has been completed. Numbers may be entered directly, one after the other, even while
previous numbers are being dialed out.

Manual Dialing

¡Ï

Repertory Dialing

Redial buffer content = Manual dialing + Repertory dialing.

Repertory Dialing

¡Ï

Manual Dialing

Redial buffer content = Repertory dialing + Manual dialing.

Repertory Dialing

¡Ï

Repertory Dialing

Redial buffer content = Repertory dialing + Repertory dialing.

Redialing

¡Ï

Manual Dialing

Redial buffer content = Redialing + Manual dialing.

W91473 SERIES

Publication Release Date: February 1995

- 11 -

Revision A3

The primary redial content may not be manual dialing. Otherwise, the last redial content will be
overwritten.

Redialing

¡Ï

Repertory Dialing

Redial buffer content = Redialing + Repertory dialing.

Redialing is valid only as the first key-in after off-hook or after the handfree dialing function is
toggled on.

The second sequence should not be performed until the first sequence is completely dialed out.

Manual Dialing

¡Ï

One key Redialing

Redial buffer content = Manual dialing.

The one-key redial may only be used after dialing out of a manual dialing sequence is completed.

Repertory Dialing 1(M1)

¡Ï

One key Redialing

¡Ï

Repertory Dialing 2(M2)

¡Ï

One key Redialing

Repertory Dialing 1(M1)

¡Ï

One key Redialing

¡Ï

Repertory Dialing 2(M2)

ON HOOK

OFF HOOK

Redialing

M1 and M2 represent any of the repertory dialing memories.

The first redialing will dial out M1; the second will dial out M1, M2.

If dialing out of the repertory dialing memories has not been completed, the one-key redial key will
be ignored.

Dialing of the second repertory dialing memory (M2) should not be performed until the one-key
redialing operation is completed.

Notes:

Chain dialing (cascaded dialing) allows for memory or manual dialing while a previous dialing
sequence is still being dialed out.More than one sequence of manual dialing is not permitted. Entering
more than one manual dialing sequence will inhibit redialing. Chain dialing of more than four sections
is not permitted.

Manual Dialing

¡Ï

Manual Dialing

(two sections of manual dialing)

If more than four sections are entered, all sections after the fourth section will be ignored and
redialing will be inhibited.

Manual Dialing

¡Ï

(over 4 sections, ignore

and inhibit redial)

There is a 2.0 sec. inter-chain dialing pause for cascaded dialing.

W91473 SERIES

- 12 -

MERCURY DIALING

1. Up to 32 digits may be stored.

2. Mercury dialing is activated only as the first key-in after off-hook or handfree dialing is activated.

3. The timing diagram for the mercury memory function is given below.

IDP

DTMF

T/P MUTE

OSC.

KEY IN

MER

HPM MUTE

OSCILLATION

Mercury Function Timing Diagram

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 Temprature

STG

-55 to +125

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

of the device.

W91473 SERIES

Publication Release Date: February 1995

- 13 -

Revision A3

DC CHARACTERISTICS

= 2.5V, Fosc. = 3.58 MHz, Ta = 25

C, all outputs unloaded)

PARAMETER

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Operating Voltage

2.0

5.5

Operating Current

Tone

0.3

0.5

Pulse

0.15

0.3

Standby Current

HKS

= 0, No load & No

key entry

Memory Retention Current

HKS

= 1, V

= 1.0V

0.2

DTMF Output Voltage

Row group, R

= 5 K

130

150

170

VrmS

Pre-emphasis

Col/Row,
V

= 2.0 to 5.5V

DTMF Distortion

= 5 K

= 2.0 to 5.5V

-30

-23

DTMF Output DC Level

TDC

= 5 K

= 2.0 to 5.5V

1.0

3.0

DTMF Output Sink Current

= 0.5V

0.2

Output Sink Current

= 0.5V

0.5

T/P

MTUE

Output Sink

Current

= 0.5V

0.5

HPM MUTE Output Sink
Current

HPMI

= 0.5V

0.5

HPM MUTE Output drive
Current

HPMH

= 2.0V

0.5

HKS

I/P Pull-high Resistor

300

Key Tone Output Current

KTH

= 2.0V

0.5

KTL

KTH

= 0.5V

0.5

HFO Drive/Sink Current

HFH

= 2.0V

0.5

HFL

= 0.5

0.5

Keypad Input Drive Current

= 0V

Keypad Input Sink Current

= 2.5V

200

400

Keypad Resistance

5.0

W91473 SERIES

- 14 -

AC CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Keypad Active in Debounce

KID

Key Release Debounce

KRD

Pre-digit Pause

PDP1

M/B = 2/3

10 ppS

M/B = 1/2

33.3

Pre-digit Pause

PDP2

M/B = 2/3

20 ppS

M/B = 1/2

16.7

Interdigit Pause (Auto dialing)

IDP

10 ppS

800

20 ppS

500

Make/Break Ratio

M/B

M/B = 2/3

40:60

M/B = 1/2

33:67

Tone Output Duration

Auto Dialing

Intertone Pause

ITP

Auto Dialing

Flash Break Time

305

600

Pause Time

3.6

Key Tone Frequency

600

Key Tone Duration

KTD

One-key Redialing Pause Time

600

One-key Redialing Break Time

2.2

First key-in Pause Time

FKP

600

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.

TIMING WAVEFORMS

W91473 SERIES

Publication Release Date: February 1995

- 15 -

Revision A3

HKS

KEY IN

T/P MUTE

KID

PDP

IDP

KID

IDP

PDP

LOW

HPM MUTE

DTMF

OSC.

OSCILLATION

FKP

Figure 1. Pulse Mode Diagram (Normal Dialing)

HKS

KEY IN

T/P MUTE

KID

ITP

DTMF

KRD

KID

ITP

KRD

LOW

HIGH

LOW

HPM MUTE

OSC.

OSCILLATION

FKP

Figure 2. Tone Mode Diagram (Normal Dialing)

Timing waveforms, continued

W91473 SERIES

- 16 -

ON HOOK

HKS

OFF HOOK

HFI

H KEY

HFO

LOW

HIGH

HPM MUTE

CHIP ENBLE

T/P MUTE

Figure 3(a).

_____
Note: The H KEY cannot be enabled when chip is disabled.

OFF HOOK

HKS

HFI

H KEY

HFO

HIGH

T/P MUTE

HPM MUTE

CHIP ENBLE

Figure 3(b).

___ _____ ___ _____
Note: The HFI and H KEY inputs will toggle the HFO signal; as soon as either HFI or H KEY is activated, the HFO signal will

go high and previous inputs will be ignored.

W91473 SERIES

Publication Release Date: February 1995

- 17 -

Revision A3

Timing waveforms, continued

ON HOOK

HKS

HFI

H KEY

HFO

HIGH

T/P MUTE

HPM MUTE

CHIP ENBLE

Figure 3(c).

Note: Changing the state of the HKS signal from high to low will initialize the HFO and HPM MUTE signals.

LOW

HKS

KEY IN

T/P MUTE

KID

PDP

IDP

LOW

HPM MUTE

DTMF

OSC.

OSCILLATION

FKP

Figure 4. Pulse Mode One-key Redialing Timing Diagram (when not first key)

W91473 SERIES

- 18 -

Timing waveforms, continued

R/P

HKS

KEY IN

T/P MUTE

KID

PDP

IDP

PDP

LOW

HPM MUTE

DTMF

OSC.

OSCILLATION

FKP

Figure 5. Pause Function Timing Diagram

*/T

HKS

KEY IN

T/P MUTE

KID

PDP

IDP

HPM MUTE

DTMF

OSC.

OSCILLATION

FKP

Figure 6. Pulse-to-Tone Function Timing Diagram

W91473 SERIES

Publication Release Date: February 1995

- 21 -

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: 852-27516023
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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