W91520N SERIES

TONE/PULSE DIALER WITH HANDFREE

AND HOLD FUNCTIONS

Publication Release Date: May 1997

- 1 -

Revision A3

GENERAL DESCRIPTION

The W91520N series are Si-gate CMOS ICs that provide the necessary signals for tone or pulse
dialing. The W91520N series provide one-key redial, handfree dialing, hold, save, and redial
functions.

FEATURES

DTMF/pulse switchable dialer

Two by 32-digit redial and save memory

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

Uses 5

5 keyboard

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

Pause, pulse-to-tone (*/T) can be stored as a digit in memory

On-hook debounce time: 150 mS

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

Minimum tone output duration: 93 msec.

Minimum intertone pause: 93 msec.

Flash break time (73, 100, 300, 600 msec.) selectable by keypad; pause time is 1.0 sec.

On-chip power-on reset

Uses 3.579545 MHz crystal or ceramic resonator

Packaged in 18 or 20-pin plastic DIP

The different dialers in the W91520N series are shown in the following table:

TYPE NO.

REPLACEMENT

TYPE NO.

PULSE

(ppS)

FLASH

(mS)

M/B

HANDFREE

DIALING

PACKAGE

(PINS)

W91520N

W91520

600/100/300/73

W91521N

W91521

600/100/300/73

W91520AN

W91520A

600/100/300/73

Yes

W91521AN

W91521A

600/100/300/73

Yes

W91520N SERIES

- 2 -

PIN CONFIGURATIONS

HKS

DTMF

MODE

HFO

W91520AN/W91521AN

T/P MUTE

HFI

H/P MUTE

DP/C5

W91520N/W91521N

HKS

DTMF

MODE

T/P MUTE

H/P MUTE

DP/C5

PIN DESCRIPTION

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

Column-

Row

Inputs

The keyboard inputs may be used with either a
standard 5

5 keyboard or an inexpensive single

contact (Form A) keyboard. Electronic input from a

can also be used. A valid key-in is defined as a single
row being connected to a single column.

XT, XT

7, 8

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 dialing
sequence, one-key redial break, and flash break time.
Otherwise, it is switched off.

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; 20 ppS for W91521N/521AN, M/B =
40:60).

Floating mode pin places the dialer in pulse mode
(10 ppS; 20 ppS for W91521N/521AN, M/B =
33.3:66.7).

W91520N SERIES

Publication Release Date: May 1997

- 3 -

Revision A3

Pin Description, continued

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

HKS

Hook switch input.

HKS = V

: On-hook state. Chip in sleeping mode, no

operation.

HKS = V

: Off-hook state. Chip is enabled for normal

operation.

HKS pin is pulled to V

by internal resistor.

DP / C5

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).

, V

14, 6

16, 6

Power input pins.

H/P MUTE

The H/P MUTE is a conventional inverter output.
During pulse dialing, flash break, one-key redial break,
and hold period, this output is active high; otherwise, it
remains in low state.

DTMF

In pulse mode, this pin remains in low state at all times.

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).

Specified

Actual

Error %

Output Frequency

697

770

852

941

1209

1336

1477

699

766

848

948

1216

1332

1472

+0.28

-0.52

-0.47

+0.74

+0.57

-0.30

-0.34

W91520N SERIES

- 4 -

Pin Description, continued

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

HFI, HFO

10, 11

I, O

Handfree control pins. The handfree control state is

toggled on by a low pulse on the HFI input pin. The
status of the handfree control state is described 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

HFI pin is pulled to V

by an internal resistor.

Detailed timing diagrams are shown in Figure 3.

BLOCK DIAGRAM

ROW

COLUMN

DTMF

RAM

COUNTER

SYSTEM CLOCK

GENERATOR

LOCATION

LATCH

D/A

ROW & COLUMN

PROGRAMMABLE

COUNTER

DATA LATCH

& DECODER

READ/WRITE

(R1 to R4, Vx)

(C1 to C4)

T/P MUTE

HFO

CONTROL

LOGIC

PULSE

CONTROL

LOGIC

KEYBOARD

INTERFACE

CONVERTER

MODE

HKS

HFI

DP/C5

H/P MUTE

W91520N SERIES

Publication Release Date: May 1997

- 5 -

Revision A3

FUNCTIONAL DESCRIPTION

Keyboard Operation

DP C5

SAVE

R/P1

R/P2

R/P1, R/P2: Redial and pause function key; P1 is 3.6 sec. and P2 is 2.0 sec.

/T:

in tone mode and P

T in pulse mode

F1, ..., F4: Flash keys, flash break time of F1 = 600 mS, F2 = 100 mS, F3 = 300 mS, F4 = 73 mS

H: Hold function key

SAVE: Save function key

R: One-key redial function

Notes:

D1, ..., Dn, D1', ..., Dn': 0, ..., 9, */T, #

R/P: R/P1 or R/P2.

Fn: F1, ..., F4

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

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

, Busy, Come

ON
HOOK

OFF HOOK

(or

ON
HOOK

HFI

¡õ

R/P

a. The redial memory content will be dialed out.

b. The

R/P

key can execute the redial function only as the first key-in after off-hook; otherwise, it

executes pause function.

c. If redialing length exceeds 32 digits, the redialing function will be inhibited.

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

, Busy,

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

W91520N SERIES

- 6 -

b. If the dialing
of

is finished, pressing the

key will cause the pulse output pin
to

go low for 2.2 seconds break time and 0.6 seconds pause time will automatically be added.

c. If the pulses of the dialed digits

have not finished,

will be ignored.

d. The redial function by

key has no break time (2.2 sec.) if it is the first key-in after off-hook.

e. The

key uses the same redial buffer as the redial function by
the

R/P1

R/P2

key,

and it is active during normal dialing or repertory dialing.

Access Pause

OFF HOOK

(or

ON HOOK

HFI

¡õ

R/P

, ...,

1. The pause function is executed in normal dialing, redial dialing, or memory dialing.

2. The pause duration of 2.0 or 3.6 seconds per pause is selected by keypad, but only one pause time

can be stored in memory

3. A detailed timing diagram for the pause function is shown in Figure 5.

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 (2.0 sec. or 3.6 sec.), 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)

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 pulse-to-tone function timing diagram is shown in Figure 6.

Save

OFF HOOK

(or

ON HOOK

HFI

¡õ

, ...,

SAVE

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

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

SAVE

will be ignored;

W91520N SERIES

Publication Release Date: May 1997

- 7 -

Revision A3

finished,

otherwise, D1, D2, ..., Dn will be duplicated to the save memory.

Flash

OFF HOOK

(or

ON HOOK

HFI

¡õ

1. Fn = F1, ..., F4

2. The dialer will execute a flash break time of 600 mS (F1), 100 mS (F2), 300 mS (F3), or 73 mS

(F4). In each case the flash pause time is 1.0 sec. before the next digit is dialed out.

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

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 7.

HOLD

OFF HOOK

(or

ON HOOK

HFI

¡õ

The HOLD is switched on and off by hold key. The other keypads will be disabled when in hold mode.

The function timing diagram is shown in Figure 3(a, b, c).

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

Operation 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.

W91520N SERIES

- 8 -

DC CHARACTERISTICS

= 2.5V, F

OSC.

= 3.579545 MHz, T

= 25

C, all outputs unloaded)

PARAMETER

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Operating Voltage

2.0

5.5

Operating Current

Tone, Unloaded

0.4

0.6

Pulse, Unloaded

0.2

0.4

Standby Current

HKS = V

, No load

& No key entry

Memory Retention
Current

HKS = V

= 1.0V

0.2

DTMF Output Voltage

Row group,
R

= 5 K

130

150

170

mVrms

Pre-emphasis

Col/Row,
V

= 2.0 to 5.5V

DTMF Distortion

THD

= 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

DP Output Sink Current

= 0.5V

0.5

T/P MUTE Output Sink
Current

TML

TMO

= 0.5V

0.5

H/P MUTE Output

HPH

= 2.0V

0.5

Drive/Sink Current

HPL

= 0.5V

0.5

HFO Drive/Sink Current

HFH

= 2.0V

0.5

HFL

= 0.5V

0.5

Keypad Input Drive
Current

= 0.0V

Keypad Input Sink
Current

= 2.5V

200

400

HKS I/P Pull-high
Resistor

300

Keypad Resistance

W91520N SERIES

Publication Release Date: May 1997

- 9 -

Revision A3

AC CHARACTERISTICS

= 2.5V, F

OSC.

= 3.579545 MHz, T

= 25

C, all outputs unloaded)

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 = V

10 ppS

Mode = Floating

33.3

Pre-digit Pause

PDP2

Mode = V

20 ppS

Mode = Floating

16.7

Interdigit Pause

IDP

10 ppS

800

(Auto Dialing)

20 ppS

500

Make/Break Ratio

M:B

Mode = V

40:60

Mode = Floating

33.3:66.7

Tone Output Duration

Auto dialing

Intertone Pause

ITP

Auto dialing

Flash Break Time

600

100

300

Flash Pause Time

F1, F2, F3, F4

1.0

Pause Time

R/P1

3.6

R/P2

2.0

One-key Redial Break
Time

2.2

One-key Redial Pause
Time

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.

W91520N SERIES

- 10 -

TIMING WAVEFORMS

IDP

HKS

KEY IN

H/P MUTE

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

H/P MUTE

T< T

OHD

Figure 1(b) Pulse Mode Auto Dialing Timing Diagram

W91520N SERIES

Publication Release Date: May 1997

- 11 -

Revision A3

Timing Waveforms, continued

HKS

KEY IN

H/P MUTE

R/P

KID

IDP

PDP

M B

DTMF

OSC.

Low

OSCILLATION

KRD

T = T

OHD

T/P MUTE

Figure 1(c) Pulse Mode Auto Dialing Timing Diagram

HKS

KEY IN

T/P MUTE

DTMF

OSC.

OSCILLATION

ITP

KID

High

ITP

OSCILLATION

KRD

H/P MUTE

Figure 2(a) Tone Mode Normal Dialing Timing Diagram

W91520N SERIES

- 12 -

Timing Waveforms, continued

HKS

KEY IN

T/P MUTE

DTMF

R/P

KRD

OSC.

OSCILLATION

ITP

KID

High

H/P MUTE

T < T

OHD

Figure 2(b) Tone Mode Auto Dialing Timing Diagram

HKS

KEY IN

T/P MUTE

DTMF

R/P

KRD

OSC.

OSCILLATION

ITP

KID

High

H/P MUTE

T = T

OHD

Figure 2(c) Tone Mode Auto Dialing Timing Diagram

W91520N SERIES

- 14 -

Timing Waveforms, continued

HKS

KEY IN

H/P MUTE

DTMF

OSC.

Low

OSCILLATION

KID

PDP

IDP

HFI

HFO

KID

PDP

T/P MUTE

Figure 4. One-key Redial Timing Diagram

HKS

KEY IN

T/P MUTE

DTMF

OSC.

Low

OSC

KID

R/P

PDP

IDP

PDP

H/P MUTE

Figure 5. Pause Function Timing Diagram

W91520N SERIES

Publication Release Date: May 1997

- 15 -

Revision A3

Timing Waveforms, continued

HKS

KEY IN

T/P MUTE

DTMF

OSC.

OSCILLATION

KID

*/T

PDP

IDP

H/P MUTE

Figure 6. Pulse-to-tone Timing Diagram

H/P MUTE

T/P MUTE

HKS

KID

DTMF

OSC.

KEY IN

Low

KID

ITP

OSCILLATION

HFI

HFO

Figure 7. Flash Timing Diagram

W91520N SERIES

- 16 -

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: 852-27513100
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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