W91540N SERIES

10-MEMORY TONE/PULSE DIALER WITH SAVE,
KEYTONE, LOCK, AND HANDFREE FUNCTIONS

Publication Release Date: May 1997

- 1 -

Revision A2

GENERAL DESCRIPTION

The W91540N series are tone/pulse switchable telephone dialers with 10 memories, keytone or lock
function, 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

Ten by 16 digit two-touch indirect repertory memory

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

Cascaded dialing

Uses 5

5 keyboard

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

Pause, P

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

0 or 9 dialing inhibition pin for PABX system or long distance dialing lock out

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

Minimum tone output duration: 93 mS (W91544AN: 87 mS)

Minimum intertone pause: 93 mS (W91544AN: 87 mS)

Pause time: 3.6 sec

300 mS off-hook delay in lock mode (

remains low for 300 mS while off-hook)

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

Make/break ratio (2:3 or 1:2) selectable by Mode pin

Key tone output for valid keypad entry recognition

On-chip power-on reset

Uses 3.579545 MHz crystal or ceramic resonator

Packaged in 18 or 20-pin DIP

W91540N SERIES

- 2 -

The different dialers in the W91540N series are shown in the following table:

TYPE NO.

REPLACEMENT

TYPE NO.

PULSE

(ppS)

FLASH

(mS)

M/B

KEY

TONE

HANDFREE

DIALING

LOCK

PACKAGE

(PINS)

W91540N

W91540

600/300/73/100

Yes

W91541

W91540AN

W91540A

600/300/73/100

Yes

W91541A

W91541LN

W91541L

600/300/73/100

Yes

W91541ALN

W91541AL

600/300/73/100

Yes

W91542N

W91542

600/300/73/100

Yes

W91542AN

W91542A

600/300/73/100

Yes

W91544AN

New type

600/300/73/100

Yes

Note: The W91544AN is designed specifically for use in France. The pause time is not added in pulse-to-tone mode.

PIN CONFIGURATIONS

T/P MUTE

MODE

DTMF

HKS

DP/C5

MODE

DTMF

HFO

T/P MUTE

HFI

HKS

DP/C5

W91540N/542N

W91540AN/542AN/544AN

W91540N SERIES

Publication Release Date: May 1997

- 3 -

Revision A2

Pin Configurations, continued

T/P MUTE

MODE

DTMF

HKS

DP/C5

LOCK

W91541LN

MODE

DTMF

HFO

T/P MUTE

HFI

HKS

DP/C5

LOCK

W91541ALN

PIN DESCRIPTION

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

Column-Row

Inputs

The keyboard input is compatible with a standard
5

5 keyboard, an inexpensive single contact

(Form A) keyboard, and electronic input.

In normal operation, any single button can be
pushed to produce a dual tone, pulses, or a
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.

W91540N SERIES

- 4 -

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
W91542N/542AN is 20 ppS).

Leaving mode pin floating places dialer in pulse
mode with M/B ratio of 33.3:66.7 (10 ppS, except
for W91542N/542AN is 20 ppS).

HKS

The

HKS

(hook switch) input is used to sense

whether the handset is on-hook or off-hook.

On-hook state,

HKS

= 1: chip is in sleeping

mode, no operation.

Off-hook state,

HKS

= 0: chip is enabled for

normal operation.

HKS

pin is pulled to V

by an internal resistor.

(except for

W91541LN)

(except for

W91541ALN)

The key tone output is a conventional CMOS
inverter. The key tone is generated when any
valid key is pressed; the KT pin generates a 1.2
KHz square wave at 35 mS. When no key is
pressed, the KT pin remains in low state.

LOCK

(only for

W91541LN)

(only for

W91541ALN)

The function of this terminal is to prevent "0"
dialing and "9" dialing under PABX system long
distance call control. When the first key input
after reset is 0 or 9, all key inputs, including the 0
or 9 key, become invalid and the chip generates
no output. The telephone is reinitialized by a
reset.

The function of the

LOCK

pin is shown below:

LOCK PIN

FUNCTION

Floating

"0", "9" dialing inhibited

Normal dialing

"0" dialing inhibited

N-channel open drain dialing pulse output.

Flash key will cause DP to be active in either
tone mode or pulse mode.

In lock mode, DP remains low for 300 mS during
off-hook delay time.

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

W91540N SERIES

Publication Release Date: May 1997

- 5 -

Revision A2

Pin Description, continued

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

DTMF

During pulse dialing, this pin remains in low state
regardless of keypad input. In 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.

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 is listed in the following
table:

CURRENT STATE

Input

HFO

Dialing

High

Yes

On Hook

High

Low

Off Hook

High

Low

Yes

On Hook

Off Hook

Low

Yes

Off Hook

Low

On Hook

Low

Off Hook

High

On Hook

High

Yes

Low

Hook SW.

HFO

NEXT STATE

HFI

pin is pulled to V

by an internal resistor.

Detailed timing diagram is shown in Figure 3.

W91540N SERIES

- 6 -

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 C4)

T/P MUTE

HFO

CONTROL

LOGIC

PULSE

CONTROL

LOGIC

KEYBOARD

INTERFACE

CONVERTER

LOCK

DP/C5

FUNCTIONAL DESCRIPTION

R/P

SAVE

S: Store function key

A: Indirect repertory memory dialing function key

R/P: Redial and pause function key

/T:

in tone mode and P

T in pulse mode

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

F1, ..., F4: Flash function keys; F1 = 600 mS, F2 = 300 mS, F3 = 73 mS, F4 = 100 mS, and flash
pause time for each key is 1.0 mS

Note: Ln = 0, ..., 9; Dn = 0, ..., 9, */T, #, Pause.

W91540N SERIES

Publication Release Date: May 1997

- 7 -

Revision A2

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 normal dialing.

Redialing Dialing

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 the first key-in after off-hook; otherwise,

it will execute pause function.

Number Store

OFF HOOK

, (or

ON HOOK

& HFI

¡õ

, ...,

, S

, Ln

1. If the sequence of the dialed digits D1, D2,

...

, Dn has not

finished,

will be ignored.

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

OFF HOOK

, (or

ON HOOK

& HFI

¡õ

, D1

, D2

, ...,

, S

, Ln

3. D1, D2,

...

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

4. 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.

5. 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

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

2. If the dialing of

is finished, pressing

SAVE

will cause D1 to Dn to be

duplicated to save memory.

OFF HOOK

, (or

ON HOOK

HFI

¡õ

SAVE

3. D1 to Dn will be dialed out after

SAVE

key is pressed.

W91540N SERIES

- 8 -

Repertory Dialing

OFF HOOK

, (or

ON HOOK

HFI

¡õ

SAVE

1. The content of save memory location will be dialed out.

OFF HOOK

, (or

ON HOOK

HFI

¡õ

2. The content of memory location Ln 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.

Pulse-to-tone (*/T)

OFF HOOK

, (or

ON HOOK

HFI

¡õ

, D2

, ...,

, */T

, D1'

, D2'

, ...,

Dn'

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

All versions except W91544AN:

D1, D2, ..., Dn, Pause, D1', D2', ..., Dn'

(Pulse) (Tone)

W91544AN:

D1, D2, ..., Dn, *, D1', D2', ..., Dn'

(Pulse) (Tone) (Tone)

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

D1, D2, ..., Dn, *, D1', D2', ..., Dn'

(Tone) (Tone)

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(a, b).

Flash

OFF HOOK

, (or

ON HOOK

HFI

¡õ

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

2. If

is pressed, the dialer will execute a flash break time of 600 mS (F1), 300 mS (F2), 73
mS

(F3), or 100 mS (F4). In each case the flash pause time is 1.0 second.

W91540N SERIES

Publication Release Date: May 1997

- 9 -

Revision A2

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

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)

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

ABSOLUTE MAXIMUM RATINGS

PARAMETER

SYMBOL

RATING

UNIT

DC supply voltage

-0.3 to +7.0

-0.3

Input/Output Voltage

+0.3

-0.3

+0.3

Power dissipation

120

Operating temperature

OPR

-20 to +70

Storage temperature

SIG

-55 to +150

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

of the device.

W91540N SERIES

- 10 -

DC CHARACTERISTICS

= 2.5V, Fosc. = 3.58 MH

, T

= 25

C; all outputs unloaded)

PARAMETER

SYM.

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Operating Voltage

2.0

5.5

Operating Current

Tone

0.4

0.6

Pulse

0.2

0.4

Standby Current

HKS

= 0, No load &

No key entry

Memory Retention Current

HKS

= 1,

= 1.0V

0.2

Tone Output Voltage

Row group,
R

= 5 K

130

150

170

mVrm

Pre-emphasis

Col/Row
V

= 2.0

5.5V

DTMF Distortion

THD

= 5 K

= 2.0

5.5V

-30

-23

DTMF Output DC Level

TDC

= 5 K

= 2.0

5.5V

1.0

3.0

DTMF Output Sink Current

= 0.5V

0.2

Output Sink Current

= 0.5V

0.5

T/P

MUTE

Output Sink

Current

= 0.5V

0.5

KT Drive/Sink Current

KTH

= 2.0V

0.5

KTL

= 0.5V

0.5

HFO Drive/Sink Current

HFH

= 2.0V

0.5

HFL

= 0.5V

0.5

Keypad Input Drive
Current

= 0V

Keypad Input Sink Current

= 2.5V

200

400

Keypad Resistance

5.0

W91540N SERIES

Publication Release Date: May 1997

- 11 -

Revision A2

AC CHARACTERISTICS

PARAMETER

SYM.

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Key-in Debounce

KID

Key Release Debounce

KRD

On-hook Debounce

OHD

Lock Mode

Unlock Mode

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

Inter-digit 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

Except for
W91544AN

Intertone Pause

ITP

Except for
W91544AN

Tone Output Duration

W91544AN Only

Intertone Pause

ITP

W91544AN Only

600

Flash Break Time

300

100

Flash Pause Time

1.0

Pause Time

3.6

Key Tone Frequency

1.2

KHz

Key Tone Duration

KTD

One-key Redialing Pause
Time

600

One-key Redialing Break
Time

2.2

Off-hook Delay

OFD

Lock Only

300

First Key-in Delay

FKD

Lock Only

300

Notes:

W91540N SERIES

- 12 -

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

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

Fosc. = 3.579545 MHz

0.02%.

2. Crystal oscillator accuracy directly affects these times.

TIMING WAVEFORMS

IDP

HKS

KEY IN

T/P MUTE

IDP

KID

IDP

PDP

M B

KRD

< 600mS

< 300mS

KID

DTMF

OSC.

Low

OSCILLATION

PDP

Figure 1(a). Normal Dialing Timing Diagram (Pulse Mode Without Lock Function)

HKS

KEY IN

T/P MUTE

OFD

IDP

PDP

KID

IDP

PDP

M B

KID

KRD

DTMF

OSC.

Low

OSCILLATION

FKD

< 600mS

< 300mS

Figure 1(b). Normal Dialing Timing Diagram (Pulse Mode with Lock Function)

W91540N SERIES

Publication Release Date: May 1997

- 13 -

Revision A2

Timing Waveforms, continued

HKS

KEY IN

T/P MUTE

R/P

KID

IDP

PDP

M B

DTMF

OSC.

Low

OSCILLATION

IDP

< 600mS

KRD

Figure 1(c). Auto Dialing Timing Diagram (Pulse Mode Without Lock Function)

HKS

KEY IN

T/P MUTE

OFD

IDP

PDP

M B

DTMF

OSC.

Low

OSCILLATION

R/P

KID

IDP

FKD

< 600mS

300mS

Figure 1(d). Auto Dialing Timing Diagram (Pulse Mode with Lock Function)

W91540N SERIES

- 14 -

Timing Waveforms, continued

HKS

KEY IN

T/P MUTE

DTMF

KID

KRD

< 600 mS

< 300 mS

OSC.

OSCILLATION

ITP

KID

High

ITP

OSCILLATION

KRD

Figure 2(a). Normal Dialing Timing Diagram (Tone Mode Without Lock Function)

HKS

KEY IN

T/P MUTE

DTMF

KID

KRD

< 600 mS

< 300 mS

OSC.

OFD

OSCILLATION

FKD

ITP

Figure 2(b). Normal Dialing Timing Diagram (Tone Mode with Lock Function)

W91540N SERIES

Publication Release Date: May 1997

- 15 -

Revision A2

Timing Waveforms, continued

HKS

KEY IN

T/P MUTE

DTMF

R/P

KRD

< 600mS

OSC.

OSCILLATION

ITP

KID

High

Figure 2(c). Auto Dialing Timing Diagram (Tone Mode Without Lock Function)

HKS

KEY IN

T/P MUTE

DTMF

R/P

KRD

< 600mS

300mS

OSC.

OFD

OSCILLATION

FKD

ITP

Figure 2(d) Auto Dialing Timing Diagram (Tone Mode with Lock Function)

W91540N SERIES

- 16 -

Timing Waveforms, continued

T/P MUTE

HFI

HKS

ON HOOK

HFO

High

CHIP ENBLE

Figure 3. Handfree Timing Diagram

HKS

KEY IN

T/P MUTE

DTMF

OSC.

Low

OSCILLATION

< 600mS

KID

R/P

OFD

300mS

PDP

IDP

PDP

FKD

OSCILLATION

Figure 4. Pause Function Timing Diagram

W91540N SERIES

Publication Release Date: May 1997

- 17 -

Revision A2

Timing Waveforms, continued

HKS

KEY IN

T/P MUTE

DTMF

OSC.

OSCILLATION

< 600mS

KID

*/T

OFD

300mS

PDP

IDP

FKD

OSCILLATION

ITP

Figure 5(a). Pulse-to-tone Timing Diagram (All Versions Except W91544AN)

HKS

KEY IN

T/P MUTE

*/T

IDP

PDP

KID

KRD

DTMF

OSC.

OSCILLATION

ITP

Figure 5(b). Pulse-to-tone Timing Diagram (W91544AN Only)

W91540N SERIES

Publication Release Date: May 1997

- 19 -

Revision A2

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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