Preliminary W91F820N SERIES

13-FLASH MEMORY TON/PULSE DIALER WITH

HANDFREE, LOCK AND HOLD FUNCTIONS

Publication Release Date: January 1999

- 1 -

Revision A1

GENERAL DESCRIPTION

The W91F820N is a series of tone/pulse switchable telephone dialers with 13-flash memory, keytone,
hold, lock, and handfree dialing control features. These chips are fabricated using Winbond's high-
performance CMOS technology and thus offer good performance in low-voltage, low-power
operations.

FEATURES

Tone/pulse switchable dialer

Two by 32 digits redial and save memory

Three by 32 digits one-touch direct repertory flash memory

Ten by 32 digits one-touch direct or two-touch indirect repertory flash memory

The read-write times: 10

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

Chain 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

Dialing rate:10 ppS or 20 pps by mask option

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 1.0 S

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

Mute key for speech network mute

No key will be accepted except the "HOLD" key when in the Hold mode

Key tone output for valid keypad entry recognition

On-chip power-on reset

Uses 3.579545 MHz crystal or ceramic resonator

20-pin 300 mil, or 22-pin 400 mil dual-in-line plastic package

The different dialers in the W91F820N series are shown in the following table:

TYPE NO.

PULSE

(PPS)

LOCK

KEY

TONE

HANDFREE

DIALING

PACKAGE

(PINS)

W91F820N

W91F820AN

W91F820LN

W91F820ALN

W91F822N

W91F822AN

Preliminary W91F820N SERIES

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PIN CONFIGURATIONS

W91F820LN

MODE

DTMF

HKS

T/P MUTE

LOCK

H/P MUTE

W91F820ALN

MODE

DTMF

HKS

T/P MUTE

LOCK

H/P MUTE

HFI

HFO

W91F820N/822N

MODE

DTMF

HKS

T/P MUTE

H/P MUTE

W91F820AN/822AN

MODE

DTMF

HKS

T/P MUTE

H/P MUTE

HFI

HFO

N.C.

Preliminary W91F820N SERIES

Publication Release Date: January 1999

- 3 -

Revision A1

PIN DESCRIPTION

SYMBOL 20-PIN 22-PIN I/O

FUNCTION

Column-

Row Inputs

The keyboard input is compatible with a standard 5

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 functions. Activation of two or
more buttons will result in no response except for a single
tone.

A built-in inverter together with an inexpensive 3.579545 MHz
crystal supplies the oscillator. The oscillator stops when there
is no keypad input. 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 turns on with a low level during a dialing
sequence (both pulse and tone mode). Otherwise, it is off.

N.C.

No connect

MODE

Connecting the mode pin to V

places the dialer in tone mode.

Connecting the mode pin to V

places the dialer in pulse

mode with an M/B ratio of 40:60.
Leaving the mode pin floating places the dialer in pulse mode
with an M/B ratio of 33.3:66.7.

HKS

The HKS (hook switch) 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.

(W91F820N/
F820AN/
F822N)

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

(W91F820LN/
820ALN only)

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 Mode

"0" dialing inhibited

Preliminary W91F820N SERIES

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Pin Description, continued

SYM.

20-PIN 22-PIN I/O

FUNCTION

H/P MUTE

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

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).

DTMF

During pulse dialing, this pin remains in a low state regardless of
the 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).

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

15, 7

17, 7

Power input pins for the dialer chip. V

is the power and V

the ground.

HFI, HFO

11, 12

I, O Handfree control pins.

A low pulse on the HFI input pin toggles the handfree control
state. The 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

The HFI pin is pulled to V

by an internal resistor.

A detailed timing diagram is shown in Figure 3.

Preliminary W91F820N SERIES

Publication Release Date: January 1999

- 5 -

Revision A1

BLOCK DIAGRAM

DTMF

HKS

MODE

RAM

COUNTER

SYSTEM CLOCK

GENERATOR

LOCATION

LATCH

D/A

ROW & COLUMN

PROGRAMMABLE

COUNTER

DATA LATCH

& DECODER

READ/WRITE

HFI

ROW

(R1 ~ R4,Vx/R5)

COLUMN

(C1 ~ C4,Vss)

T/P MUTE

HFO

CONTROL

LOGIC

PULSE

CONTROL

LOGIC

KEYBOARD

INTERFACE

CONVERTER

LOCK

H/P MUTE

FUNCTIONAL DESCRIPTION

Keyboard Operation

EM1

EM2

EM3

R/P

SAVE

Vx/R5

S: Store function key

A: Indirect repertory memory dialing function key

H: Hold 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

M9: One touch memory. The dialing number can be stored in M0

M9 locations by the S key.

Note that the two touch memory (A+ 0

A+9) share the same memory buffer with M0

M9,

respectively

Preliminary W91F820N SERIES

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EM1, ..., EM3: Emergency one-touch memory key

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

Note: D1, ..., Dn, D1`, ..., Dn`,

/T, #, Mn: EM1, ..., EM3, Ln: 0

Normal Dialing

OFF HOOK

(or

ON HOOK

HFI

...

1. D1, D2,

...

, Dn will be dialed out.

2. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits in normal dialing.

Redialing Dialing

OFF HOOK

(or

ON HOOK

HFI

...

, BUSY

Come

ON HOOK

OFF HOOK

(or

ON HOOK

HFI

R/P

The

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

the pause function.

Number Store

OFF HOOK

(or

ON HOOK

HFI

, ...,

(or

SAVE

)

a. The dialing out of

must first be finished before the

key is pressed.

b. D1, D2,

...

, Dn will be stored in memory location Mn or saved and then dialed out.

OFF HOOK

(or

ON HOOK

HFI

, ...,

(or

SAVE

)

a. D1, D2,

...

, Dn will be stored in memory location, Mn (or saved), but will not be dialed out.

R/P

and

*/T

keys can be stored as a digit in memory, but the

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

, ...,

Save

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

b. If the dialing of

is finished, pressing

SAVE

will duplicate D1 to Dn to the

save memory.

Preliminary W91F820N SERIES

Publication Release Date: January 1999

- 7 -

Revision A1

OFF HOOK

(or

ON HOOK

HFI

come on

OFF HOOK

(or

ON HOOK

HFI

SAVE

c. D1 to Dn will be dialed out after the

SAVE

key is pressed.

Repertory Dialing Procedure

One-touch direct repertory dialing:

OFF HOOK

(or

ON HOOK

HFI

(or

SAVE

)

Two-touch direct repertory dialing:

OFF HOOK

(or

ON HOOK

HFI

(or

)

Access Pause

OFF HOOK

(or

ON HOOK

HFI

R/P

, ...,

1. The pause function can be stored in memory.

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

3. The pause function timing diagram is shown in Figure 6.

Pulse to Tone (*/T)

OFF HOOK

(or

ON HOOK

HFI

, ...,

*/T

D1'

D2'

, ...,

Dn'

1. If the mode switch is set in pulse mode, then it will perform

D1, D2, ---, Dn, Pause (3.6 sec), D1', D2', ---, Dn'

(Pulse)

(Tone)

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

D1, D2, ---, Dn, * , D1', D2', ---, Dn'

(Tone)

3. It can be reset to pulse mode only if ON HOOK is active. This is because it remains in tone mode

when the digits have been dialed out.

4. The function timing diagram is shown in Figure 7.

Flash

OFF HOOK

(or

ON HOOK

HFI

1. Fn = F1

F4. If

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

Preliminary W91F820N SERIES

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(F2), 73 mS (F3) or 100 mS (F4) and a pause time of 1.0 second, after which the next digit is dialed
out.

2. The flash key has the first priority of the keyboard function only one flash key will be released to

the user.

3. When the flash key is key in, the system will return to the initial state after the flash pause time is

finished.

4. The flash function timing diagram is shown in Figure 8.

Cascaded Dialing

OFF HOOK

(or

ON HOOK

HFI

)

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 is valid only for the first key-in.

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

Mute

OFF HOOK

MUTE

MUTE has an on/off toggle function. The functional timing diagram is shown in Figure 8 .

ABSOLUTE MAXIMUM RATING

PARAMETER

SYMBOL

RATING

UNIT

DC Supply Voltage

-V

-0.3 to +7.0

-0.3

Input/Output Voltage

+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.

Preliminary W91F820N SERIES

Publication Release Date: January 1999

- 9 -

Revision A1

DC CHARACTERISTICS

= 2.5V, Fosc. = 3.58 MHz, T

= 25

C, all outputs unloaded)

PARAMETER

SYM.

CONDITIONS

MIN. TYP. MAX.

UNIT

Operating Voltage

2.4

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, V

= 1.0V

Tone Output Voltage

Row group, R

= 5 K

130

150

170

mVrms

Pre-emphasis

Col/Row, V

= 2.0

5.5V

DTMF Distortion

THD

= 5 K

, V

= 2.0

5.5V

-30

-23

DTMF Output DC Level

TDC

= 5 K

, V

= 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

H/P MUTE

HPH

= 2.0V

0.5

Drive/Sink Current

HPL

= 0.5V

0.5

Keypad Input Drive Current

= 0V

HKS Pull High Resister

RHKS

300

500

Keypad Input Sink Current

= 2.5V

200

400

Keypad Resistance

5.0

Preliminary W91F820N SERIES

- 10 -

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

(Auto Dialing)

IDP

10 ppS

(W91F820N/W91F820AN/

F820LN/F820ALN

800

20 ppS

(W91F822N/F822AN only)

500

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

Key Tone Frequency

1.2

KHz

Key Tone Duration

KTD

One-key Redialing
Pause Time

600

One-key Redialing
Break Time

2.2

First Key-in Delay

FKD

Lock only

300

Notes:
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.

Preliminary W91F820N SERIES

Publication Release Date: January 1999

- 11 -

Revision A1

TIMING WAVEFORMS

KID

IDP

PDP

KID

IDP

PDP

HKS

KEY IN

T/P MUTE

LOW

OSC.

H/ P MUTE

DTMF

OSC.

Figure 1(a) Pulse Mode Tming Diagram (Normal dialing without lock function)

IDP

KID

IDP

PDP

KEY IN

LOW

OSC.

H/P MUTE

DTMF

OSC.

(long mute)

FKD

HKS

T/P MUTE

<300 mS

Figure 1(b) Pulse Mode Timing Diagram (Normal dialing with lock function)

Preliminary W91F820N SERIES

- 12 -

Timing Waveforms, continued

R/P

IDP

PDP

IDP

PDP

LOW

OSC.

H/P MUTE

DTMF

OSC.

ON HOOK

M B

KEY IN

T/P MUTE

HKS

(long mute)

Figure 1(c) Pulse Mode Timing Diagram (Auto dialing without lock)

R/P

IDP

PDP

LOW

OSC.

H/P MUTE

DTMF

OSC.

<300 mS

FKD

HKS

KEY IN

T/P MUTE

(long mute)

Figure 1(d) Pulse Mode Timing Diagram (Auto dialing with lock function)

Preliminary W91F820N SERIES

Publication Release Date: January 1999

- 13 -

Revision A1

Timing Waveforms, continued

KID

HIGH

OSC.

DTMF

OSC.

ITP

KRD

ITP

KRD

KID

ITP

KRD

LOW

H/P MUTE

DTMF

HKS

KEY IN

T/P MUTE

Figure 2(a) Tone Mode Timing Diagram (Normal dialing without lock)

HIGH

OSC.

ITP

KRD

ITP

KRD

KID

ITP

KRD

LOW

< 300 mS

FKD

DTMF

OSC.

H/P MUTE

HKS

KEY IN

T/P MUTE

Figure 2(b) Tone Mode Timing Diagram (Normal dialing with lock function)

Preliminary W91F820N SERIES

Publication Release Date: January 1999

- 15 -

Revision A1

Timing Waveforms, continued

HIGH

OSC.

ITP

LOW

R/P

ON HOOK

KID

T > T

OHD

(return to initial state)

DTMF

OSC.

H/P MUTE

HKS

KEY IN

T/P MUTE

Figure 2(e) Tone Mode Timing Diagram with On-hook Debounce (Auto dialing without lock)

HIGH

CHIP ENABLE

T/P MUTE

H/P MUTE

LOW

HKS

H KEY

OFF HOOK

ON HOOK

Note: The H KEY can not be enabled during chip dissable.

HFI

HFO

Figure 3(a)

Preliminary W91F820N SERIES

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Timing Waveforms, continued

HIGH

OFF HOOK

CHIP ENABLE

T/P MUTE

H/P MUTE

HKS

H KEY

HFI

HFO

Figure 3(b)

Note: The H KEY and HFI inputs will toggle the HFO signal. The first time HFI or H KEY are activated, the HFO signal will go

high and the previous active input will be neglected.

HIGH

ON HOOK

CHIP ENABLE

T/P MUTE

H/P MUTE

HKS

H KEY

HFI

HFO

Figure 3(c)

Note: The HKS signal change of state from high to low will initialize both the HFO and H/P MUTE signals.

Preliminary W91F820N SERIES

Publication Release Date: January 1999

- 17 -

Revision A1

Timing Waveforms, continued

IDP

PDP

LOW

OSC.

CHIP ENABLE

DTMF

OSC.

ON HOOK

FKD

KID

OFD

T<T

OSC.

OFD

OHD

H/P MUTE

HKS

KEY IN

T/P MUTE

OHD

<300 mS

Figure 4 Lock Function Timing Diagram

OKR

IDP

KID

IDP

PDP

LOW

OSC.

HKS

KEY IN

T/P MUTE

H/P MUTE

DTMF

OSC.

LOW

PDP

Figure 5 Pulse Mode One-key Dedialing Timing Diagram (without lock)

Preliminary W91F820N SERIES

- 20 -

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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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: W91F820LN