Datasheet W91541LN, W91541ALN, W91540N, W91540AN, W91544AN Datasheet (Winbond Electronics)

W91540N SERIES

DP

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

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 (

• 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

remains low for 300 mS while off-hook)

Publication Release Date: May 1997

- 1 - Revision A2

W91540N SERIES

DP/C5

C1

• 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

W91540N W91540 10 600/300/73/100 Pin Yes - - 18

W91541

W91540AN W91540A 10 600/300/73/100 Pin Yes Yes - 20

W91541A
W91541LN W91541L 10 600/300/73/100 Pin - - Yes 18
W91541ALN W91541AL 10 600/300/73/100 Pin - Yes Yes 20
W91542N W91542 20 600/300/73/100 Pin Yes - - 18
W91542AN W91542A 20 600/300/73/100 Pin Yes Yes - 20
W91544AN New type 10 600/300/73/100 Pin Yes Yes - 20

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

PIN CONFIGURATIONS

20
19

18
17
16

15
14
13
12
11

R4
R3

R2

R1

V

DD

MODE

DTMF

DP/C5

HKS
HFO

C1
C2

C3

C4
KT

V

SS

XT

XT

T/P MUTE

1

18

16

15
14
13
12
11
10

17

R4

R3

R2
R1

V

DD

MODE

DTMF

HKS

1
2
3
4
5

6

7

8

9

C2
C3
C4

KT

V

SS

XT
XT

T/P MUTE

HFI

2
3

4
5
6
7
8

9

10

(PINS)

W91540N/542N

W91540AN/542AN/544AN

- 2 -

Pin Configurations, continued

XT

MUTE

MUTE

T/P MUTE

C1
C2
C3
C4

LOCK

V

SS

XT
XT

1
2
3
4
5
6

7

8

9 10

18
17
16
15
14
13

12
11

R4
R3
R2
R1

V

DD

MODE
DTMF
DP/C5
HKS

C1
C2
C3
C4

LOCK

VSS

XT
XT

T/P MUTE

HFI

W91540N SERIES

1

20

R4
19
18
17
16
15
14
13
12

11

R3

R2

R1

V

DD

MODE
DTMF

DP/C5
HKS

HFO

2
3
4

5
6
7

8

9

10

W91541LN

W91541ALN

PIN DESCRIPTION

SYMBOL 18-PIN 20-PIN I/O FUNCTION

Column-Row
Inputs

1−4

&

15−18

1−4

&

17−20

XT 7 7 I A built-in inverter provides oscillation with an

8 8 O Crystal oscillator output pin.

T/P

9 9 O

I 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.

inexpensive 3.579545 MHz crystal. The oscillator
ceases when a keypad input is not sensed. The
crystal frequency deviation is 0.02%.

The T/P

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.

Publication Release Date: May 1997

- 3 - Revision A2

W91540N SERIES

HKS

HKS

HKS

HKS

HKS

LOCK

LOCK

DP/C5

Pin Description, continued

SYMBOL 18-PIN 20-PIN I/O FUNCTION

MODE 13 15 I Pulling mode pin to VSS places dialer in tone

mode.
Pulling mode pin to VDD 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).

10 12 I

The

(hook switch) input is used to sense

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

KT 5

(except for

W91541LN)

(only for

W91541LN)

11 13 O N-channel open drain dialing pulse output.

On-hook state,

= 1: chip is in sleeping

mode, no operation.
Off-hook state,

= 0: chip is enabled for

normal operation.

pin is pulled to VDD by an internal resistor.

5

(except for

W91541ALN)

O 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.

5

5

(only for

W91541ALN)

I 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

V

DD

Floating

V

SS

"0", "9" dialing inhibited

Normal dialing
"0" dialing inhibited

pin is shown below:

FUNCTION

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).

- 4 -

W91540N SERIES

HFI

HFI

HFI

HFI

Pin Description, continued

SYMBOL 18-PIN 20-PIN I/O FUNCTION

DTMF 12 14 O 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)

OUTPUT FREQUENCY

R1
R2
R3
R4
C1
C2
C3

Specified

697
770
852

941
1209
1336
1477

Actual

699
766
848

948
1216
1332
1472

Error %

+0.28

-0.52

-0.47

+0.74

+0.57

-0.30

-0.34

VDD, VSS 14, 6 16, 6 I Power input pins for the dialer chip. VDD is the main

power and VSS is the ground.

, HFO

- 10, 11 I, O

Handfree control pins. A low pulse on the

input pin

toggles the handfree control state.
Status of the handfree control is listed in the following

table:

Input

HFI
HFI

NEXT STATE

HFO

High
Low
Low Yes

Low Yes

Dialing

Yes

No

Yes

CURRENT STATE

Hook SW.

On Hook High
Off Hook
On Hook Off Hook
Off Hook
Off Hook High On Hook High

HFO

Low

High

Low On Hook Low No

pin is pulled to VDD by an internal resistor.

Detailed timing diagram is shown in Figure 3.

Publication Release Date: May 1997

- 5 - Revision A2

BLOCK DIAGRAM

DP/C5

W91540N SERIES

XT XT

ROW

(R1 to R4, Vx)

KEYBOARD
INTERFACE

COLUMN

(C1 to C4)

DTMF

D/A

CONVERTER

FUNCTIONAL DESCRIPTION

C1 C2 C3 C4

LOCATION

LATCH

ROW & COLUMN

PROGRAMMABLE

COUNTER

HKS

HFI

READ/WRITE

COUNTER

RAM

DATA LATCH

& DECODER

SYSTEM CLOCK

GENERATOR

CONTROL

LOGIC

PULSE

CONTROL

LOGIC

LOCK

MODE

T/P MUTE

KT

DP/C5
HFO

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 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.

- 6 -

Normal Dialing

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

W91540N SERIES

OFF HOOK , (or ON HOOK

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.

&

), D1 , D2 , ..., Dn

Redialing Dialing

OFF HOOK , (or ON HOOK

Come ON HOOK , OFF HOOK , (or ON HOOK

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.

&

), D1 , D2 , ..., Dn , Busy

&

), R/P

Number Store

OFF HOOK , (or ON HOOK

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

2. D1, D2, ..., Dn will be dialed out and stored in memory location Ln.
OFF HOOK , (or ON HOOK &

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

&

), D1 , D2 , ..., Dn , S , S , Ln

S will be ignored.

), S , D1 , D2 , ..., Dn , S , Ln

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

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

2. If the dialing of D1 to Dn is finished, pressing SAVE will cause D1 to Dn to be

duplicated to save memory.

OFF HOOK , (or ON HOOK

3. D1 to Dn will be dialed out after SAVE key is pressed.

, (or ON HOOK

&

&

), D1 , D2 , ..., Dn , SAVE

), SAVE

Publication Release Date: May 1997

- 7 - Revision A2

Repertory Dialing

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

W91540N SERIES

OFF HOOK , (or ON HOOK

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

OFF HOOK , (or ON HOOK

2. The content of memory location Ln will be dialed out.

&

&

), SAVE

), A , Ln

Access Pause

OFF HOOK , (or ON HOOK

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.

&

), D1 , D2 , R/P , D3 , ..., Dn

Pulse-to-tone (*/T)

OFF HOOK , (or ON HOOK

, 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)

&

), D1 , D2 , ..., Dn , */T , D1'

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(a, b).

Flash

OFF HOOK , (or ON HOOK

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

2. If Fn 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.

&

), Fn

- 8 -

W91540N SERIES

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

1. Normal Dialing + Repertory Dialing + Normal Dialing

(1st sequence) (2nd sequence)

2. Repertory Dialing + Normal Dialing + Repertory Dialing

(1st sequence) (2nd sequence)

3. 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 VDD−VSS -0.3 to +7.0 V

VIL VSS -0.3 V

Input/Output Voltage VIH VDD +0.3 V

VOL VSS -0.3 V

VOH VDD +0.3 V
Power dissipation PD 120 mW
Operating temperature TOPR -20 to +70
Storage temperature TSIG -55 to +150

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

of the device.

°C
°C

Publication Release Date: May 1997

- 9 - Revision A2

W91540N SERIES

HKS

HKS

DP

MUTE

DC CHARACTERISTICS

(VDD−VSS = 2.5V, Fosc. = 3.58 MHZ, TA = 25° C; all outputs unloaded)

PARAMETER SYM. CONDITIONS MIN. TYP. MAX. UNIT

Operating Voltage VDD - 2.0 - 5.5 V
Operating Current IOP Tone - 0.4 0.6 mA

Pulse - 0.2 0.4 mA

Standby Current ISB

Memory Retention Current IMR

Tone Output Voltage VTO Row group,

Pre-emphasis Col/Row

DTMF Distortion THD

DTMF Output DC Level VTDC

DTMF Output Sink Current ITL VTO = 0.5V 0.2 - - mA

Output Sink Current

T/P
Current

KT Drive/Sink Current IKTH VKTH = 2.0V 0.5 - - mA

HFO Drive/Sink Current IHFH VHFH = 2.0V 0.5 - - mA

Output Sink

IPL VPO = 0.5V 0.5 - - mA
IML VMO = 0.5V 0.5 - - mA

IKTL VKTL = 0.5V 0.5 - - mA

= 0, No load &

No key entry

= 1,

VDD = 1.0V

RL = 5 KΩ

VDD = 2.0−5.5V
RL = 5 KΩ

VDD = 2.0−5.5V
RL = 5 KΩ

VDD = 2.0−5.5V

- - 15

- - 0.2

130 150 170 mVrm

1 2 3 dB

- -30 -23 dB

1.0 - 3.0 V

µA

µA

s

IHFL VHFL = 0.5V 0.5 - - mA

Keypad Input Drive
Current

Keypad Input Sink Current IKS VI = 2.5V 200 400 ­Keypad Resistance - - 5.0

IKD VI = 0V 4 - -

- 10 -

µA

µA

KΩ

W91540N SERIES

AC CHARACTERISTICS

PARAMETER SYM. CONDITIONS MIN. TYP. MAX. UNIT

Key-in Debounce TKID - - 20 - mS
Key Release Debounce TKRD - - 20 - mS
On-hook Debounce TOHD Lock Mode - 20 - mS

Unlock Mode - 150 - mS

Pre-digit Pause

Pre-digit Pause

Inter-digit Pause TIDP 10 ppS - 800 - mS
(Auto Dialing) 20 ppS - 500 - mS
Make/Break Ratio M:B Mode Pin = VDD - 40:60 - %

Tone Output Duration TTD Except for

Intertone Pause TITP Except for

Tone Output Duration TTD W91544AN Only - 87 - mS
Intertone Pause TITP W91544AN Only - 87 - mS

Flash Break Time TFB F2 - 300 - mS

Flash Pause Time TFP - - 1.0 - S
Pause Time TP - - 3.6 - S
Key Tone Frequency FKT - - 1.2 - KHz
Key Tone Duration TKTD - - 35 - mS
One-key Redialing Pause

Time
One-key Redialing Break

Time
Off-hook Delay TOFD Lock Only - 300 - mS
First Key-in Delay TFKD Lock Only - 300 - mS

Notes:

1

2

TPDP1 Mode Pin = VDD - 40 - mS

10 ppS Mode Pin =

Floating

TPDP2 Mode Pin = VDD - 20 - mS

20 ppS Mode Pin =

Floating

Mode Pin =
Floating

W91544AN

W91544AN

F1 - 600 -

F3 - 73 ­F4 - 100 -

TRP - - 600 - mS

TRB - - 2.2 - S

- 33.3 - mS

- 16.7 - mS

- 33.3:66.7 - %

- 93 - mS

- 93 - mS

Publication Release Date: May 1997

- 11 - Revision A2

W91540N SERIES

OSCILLATION

OSCILLATION

OSCILLATION

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

HKS

KEY IN

DP

T/P MUTE

KT

DTMF

OSC.

HKS

KEY IN

DP

T/P MUTE

KT

< 600mS

< 300mS

3

T

KID

4

BM

T

IDP

T

PDP

2

M B

T

IDP

T

IDP

2

T

KID

T

PDP

Low

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

< 600mS

< 300mS

4

T

KID

BM

T

PDP

T

FKD

2

M B

T

IDP

T

IDP

2

T

KID

T

PDP

T

3

OFD

T

T

KRD

T

KRD

T

IDP

IDP

DTMF

Low

OSC.

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

- 12 -

OSCILLATION

Timing Waveforms, continued

M

M

W91540N SERIES

HKS

KEY IN

DP

T/P MUTE

KT

DTMF

OSC.

HKS

< 600mS

T

R/P

KRD

T

KID

BM

T

PDP

OSCILLATION

T

Low

IDP

M B

T

IDP

T

IDP

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

< 600mS

KEY IN

DP

T/P MUTE

KT

DTMF

OSC.

T

FKD

R/P

T

KID

B

T

PDP

T

IDP

B

T

IDP

300mS

T

OFD

Low

OSCILLATION

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

Publication Release Date: May 1997

- 13 - Revision A2

T

IDP

Timing Waveforms, continued

W91540N SERIES

HKS

KEY IN

DTMF

T/P MUTE

KT

DP

OSC.

HKS

KEY IN

DTMF

T/P MUTE

OSC.

< 600 mS

< 300 mS

3

T

KID

T

TD

4

2

T

ITP

T

ITP

T

KRD

5

T

ITP

High

OSCILLATION

OSCILLATION

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

< 600 mS

< 300 mS

4

T

FKD

2

T

TD

OSCILLATION OSCILLATION

5

T

ITP

T

ITP

KT

DP

T

3

OFD

T

2

T

KID

T

ITP

OSCILLATION

T

2

T

KID

T

ITP

KRD

KRD

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

- 14 -

Timing Waveforms, continued

W91540N SERIES

HKS

KEY IN

DTMF

T/P MUTE

KT

DP

OSC.

< 600mS

T

KRD

R/P

T

KID

T

TD

T

ITP

High

OSCILLATION

T

ITP

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

HKS

KEY IN

DTMF

T/P MUTE

KT

DP

OSC.

< 600mS

T

KRD

R/P

300mS

T

OFD

T

TD

T

FKD

OSCILLATION

T

ITP

T

ITP

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

Publication Release Date: May 1997

- 15 - Revision A2

Timing Waveforms, continued

W91540N SERIES

HKS

HFI

HFO

T/P MUTE

CHIP ENBLE

HKS

KEY IN

DP

T/P MUTE

< 600mS

300mS

T

OFD

ON HOOK

High

Figure 3. Handfree Timing Diagram

2

R/P

T

KID

BM

T

PDP

3

T

P

T

IDP

M

B

T

PDP

KT

DTMF

OSC.

T

FKD

OSCILLATION

Low

OSCILLATION

Figure 4. Pause Function Timing Diagram

- 16 -

Timing Waveforms, continued

W91540N SERIES

HKS

KEY IN

T/P MUTE

DTMF

OSC.

HKS

KEY IN

DP

T/P MUTE

< 600mS

2

DP

300mS

T

OFD

*/T

T

KID

BM

T

PDP

T

IDP

3

T

P

KT

T

FKD

OSCILLATION

OSCILLATION

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

4

T

KID

BM

T

PDP

*/T

T

IDP

T

ITP

T

KRD

2

T

KID

KT

DTMF

OSC.

T

ITP

OSCILLATION

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

Publication Release Date: May 1997

- 17 - Revision A2

T

ITP

OSCILLATION

Timing Waveforms, continued

W91540N SERIES

HKS

KEY IN

DP

HFI

HFO

T/P MUTE

KT

DTMF

OSC.

Low

F

T

KID

F

T

FB

T

KID

F

T

FB

OSCILLATION

3

T

FP

T

KID

T

ITP

Figure 6. Flash Timing Diagram

- 18 -

W91540N SERIES

Headquarters

No. 4, Creation Rd. III,
Science-Based Industrial Park,
Hsinchu, Taiwan
TEL: [phone]
FAX: [phone]
http://www.winbond.com.tw/
Voice & Fax-on-demand: 886-2-7197006

Winbond Electronics (H.K.) Ltd.

Rm. 803, World Trade Square, Tower II,
123 Hoi Bun Rd., Kwun Tong,
Kowloon, Hong Kong
TEL: [phone]
FAX: [phone]

Taipei Office

11F, No. 115, Sec. 3, Min-Sheng East Rd.,
Taipei, Taiwan
TEL: [phone]
FAX: [phone]

Note: All data and specifications are subject to change without notice.

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: [phone]

FAX: [phone]

Publication Release Date: May 1997

- 19 - Revision A2