W91620 SERIES

10-MEMORY TONE/PULSE DIALER WITH

TWO-STAGE REDIAL FUNCTION

Publication Release Date: December 1994

- 1 -

Revision A3

GENERAL DESCRIPTION

The W91620 series are Si-gate CMOS ICs that provide the signals needed for either pulse or tone
dialing. The W91620 series features a ten-channel, 32-digit automatic dialing memory.

FEATURES

DTMF/Pulse switchable dialer

32-digit redial memory

Two-stage redial function

Ten by 32 digit two-touch indirect repertory memory

Mixed dialing, cascade dialing allowed

Pulse-to-tone (P

T) keypad for long distance call operation

Easy operation with redial, flash, pause and P

T keypads

Pause, pulse-to-tone (P

T) can be stored as a digit in memory

Tone output duration: as long as key is depressed or 90 mS minimum

Minimum intertone pause: 90 mS

Flash time: 100 mS

Uses 4

5 keyboard

On-chip power-on reset

Uses 3.579545 MHz crystal or ceramic resonator

Packaged in 18-pin DIP

The different dialers in the W91620 series are shown in the following table

TYPE NO.

DIALING RATE

PAUSE

B:M

FLASH

W91620

10 ppS

4 sec

2:1

100 mS

W91621

3:2

W91620 SERIES

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PIN CONFIGURATION

MODE

DTMF

DP/C5

HKS

T/P MUTE

P MUTE

PIN DESCRIPTION

SYMBOL

PIN NO.

I/O

FUNCTION

Column-

Row Inputs

Keyboard inputs are designed for use with either a standard 4

keyboard or an inexpensive single contact (Form A) keyboard.

Electronic input from a

C can also be used.

Valid key entry is defined by a connection between a single row and
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 inverter output. It is low
during pulse and tone mode dialing sequence and flash break;
otherwise, it remains high.

MODE

Mode pin.

Pull to V

: Tone mode

Pull to V

or leave floating: Pulse mode (10 ppS, M/B = 2:3 or 1:2)

W91620 SERIES

Publication Release Date: December 1994

- 3 -

Revision A3

Pin Description, Continued

SYMBOL

PIN NO.

I/O

FUNCTION

HKS

Hook switch input. Conventional CMOS input with an internal
protection diode and a pull-high resistor to V

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

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

During dialing, this input ignores HKS = 1 for durations of less than
150 mS (i.e., dialing is not terminated).

DP /C5

Open drain dialing pulse output (Figure 1).

Flash key causes DP /C5 to be active in both tone mode and pulse
mode.

DTMF

During pulse dialing, maintains 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(a, b).

OUTPUT FREQUENCY

Specified

Actual

Error %

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

, V

14, 6

Power input pins.

P MUTE

The P MUTE is a conventional CMOS inverter output. It is high
during pulse dialing sequence and flash break. Otherwise, it
remains low.

W91620 SERIES

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BLOCK DIAGRAM

HKS

MODE

T/P MUTE

COLUMN

ROW

P MUTE

DP/C5

(R1 to R4)

DTMF

SYSTEM CLOCK
GENERATION

READ/WRITE
COUNTER

RAM

LOCATION
LATCH

ROW & COLUMN
PROGRAMMABLE
COUNTER

DATA LATCH
& DECODER

KEYBOARD
INTERFACE

(C1 to C4)

D/A

CONVERTER

PULSE
CONTROL
LOGIC

CONTROL

LOGIC

FUNCTIONAL DESCRIPTION

Keyboard Operation

DP / C5

S: Store function key

F: Flash key

T: In pulse mode, this key works as Pulse

Tone key

R: Redial function key

A: Indirect repertory dialing key

P: Pause key

W91620 SERIES

Publication Release Date: December 1994

- 5 -

Revision A3

Normal Dialing

OFF HOOK

, ...,

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.

3. Dialing mode is determined at the on/off hook transition.

Redialing

OFF HOOK

, ...,

, Busy,
Come

ON HOOK

OFF HOOK

The

key executes the redialing
function.

2. Redial content = D1, D2, ..., Dn

OFF HOOK

D1'

D2'

D3'

D4'

a. D1, D2, ..., Dn, D1', D2', P

T, D3', D4' will be dialed out.

b. Redial register is changed to D1, D2, ..., Dn, D1', D2', P

T, D3', D4'.

OFF HOOK

(1st)

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

(2 nd)

T, D3', D4' will be dialed out.

3. Ln content = D1, D2, P

T, D3, D4

OFF HOOK

, will dial out D1, D2, P

T, D3,

then

ON HOOK

OFF HOOK

will dial out D1,
D2.

OFF HOOK

Busy, then

ON HOOK

OFF HOOK

a. The digits stored in Lm, Ln, and Lp will be dialed out after
the

key is pressed.

b. If length oversteps 32 digits, redial is inhibited.

c. Redial register stores not only normal dialing digits but also repertory or mixed dialed numbers.

W91620 SERIES

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Number Store

OFF HOOK

, ...,

ON HOOK

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

b. Ln = 0 to 9; Dn = 0 to 9, * , # , Pause, P

c. The store mode is released to the initial state only when all store operations are finished. There

is no need to
perform

ON HOOK

OFF HOOK

to begin a second store
operation.

For
example

then

D1'

D2'

D3'

D4'

then

, ..., is still
available.

But the following sequence is not valid:

then

OFF HOOK

ON HOOK

a. Redial content is transferred to memory Ln.

b. When the last number was dialed from redial memory, the content of the redial memory cannot

be transferred to a memory location. For example, if the redial content is 1 2 3 4 5 + A 3, it
cannot be transferred to a memory location, and the content of Ln will not be modified.

Memory Clear

OFF HOOK

, ...

The Ln, Lp, etc., memories will be cleared.

Repertory Dialing

OFF HOOK

1. The digits stored in Ln will be dialed out.

2. The type of output signal is determined by the mode switch.

3. The redial register content is the content of location number Ln.

4. If the content of Ln is 1, 2, 3, P

T, 4, 5, 6, the redial function will execute the P

¡÷

T function and

the system will change to tone mode.

Access Pause

OFF HOOK

, ...,

W91620 SERIES

Publication Release Date: December 1994

- 7 -

Revision A3

1. The pause function can be stored in memory.

2. The pause function may be executed in normal dialing, redialing, or memory dialing (4.0
sec/pause).

3. The pause function can be stored as the first digit in memory.

4. The pause time depends on the number of times the P key is depressed. For example, if the

sequence 1, 2, P, P, 4, 5, 6 is keyed in, then the pause time is 8 seconds.

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

W91620 SERIES

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Pulse-to-tone (P

OFF HOOK

, ...,

D1'

D2'

, ...,

Dn'

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

D1, D2, ..., Dn, no pause, D1', D2', ..., Dn'
(Pulse)

(Tone)

In this case, the device can be reset to pulse mode only by going on-hook, because tone mode
remains enabled after the digits have been dialed out.

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

D1, D2, ..., Dn, no pause, D1', D2', ..., Dn'
(Tone)

(Tone)

c. The P

T key may be pressed before the first sequence is dialed out completely.

OFF HOOK

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

D1, D2, ..., Dn
(Pulse)

b. In the first redial operation, only the digits before the tone key are dialed out.

(2nd)

D1', D2', ..., Dn' are dialed out.
(Tone)

c. In the second redial operation, the digits after the tone key are dialed out.

OFF HOOK

a. The P

T key can be stored in memory as a digit. The digits after the P

T key are also sent in

repertory dialing.

b. The P

T key does not stop dialing (no pause).

c. The number stored in memory location Ln will be transferred to the redial register, but the P

function will not be executed during redialing if the P

T key has been stored in location Ln.

d. The P

T function timing diagram is shown in Figure 4.

W91620 SERIES

Publication Release Date: December 1994

- 9 -

Revision A3

Flash

OFF HOOK

1. The

key may be pressed before digits D1, D2, D3 are sent completely. Digits D4, D5, D6

may be pressed during the 100 mS. flash period.

2. The flash key cannot be stored as a digit in memory or in the redial register.

3. The content of the redial register is D1, D2, D3, D4, D5, D6.
The

key is not stored in the

redial register.

OFF HOOK

then

ON HOOK

OFF HOOK

D1, D2, D3, D4, D5, D6 will be dialed out.

5. The flash does not have first priority among the keyboard functions.

6. The flash pause time is 800 mS, so there is a pause of 800 mS between the flash and the next digit

dialed (see Figure 5).

7. The dialer will not return to the initial state after the flash break time has elapsed.

8. The flash function timing diagram is shown in Figure 5.

Cascaded & Mixed Dialing

Cascaded Dialing

1. Definition of cascaded dialing:

The next sequence may be pressed before the previous sequence is sent out completely.

Examples of cascaded dialing.

Example

Normal dialing

¡Ï

Repertory dialing 1

¡Ï

Repertory dialing 2

¡Ï

...

Example

Repertory dialing

¡Ï

Normal dialing

¡Ï

Repertory dialing 2

¡Ï

...

Example

Redialing

¡Ï

Normal dialing

¡Ï

Repertory dialing 1

¡Ï

...

2. The rectangles above represent one sequence of normal dialing, redialing, or repertory dialing.

3. At most 64 digits are allowed in cascaded dialing. There is no limitation on the number of

sequences.

4. The content of cascaded dialing may include a combination of normal dialing, redialing, and

repertory dialing. Redialing is valid only as the first key-in, however.

ON HOOK

OFF HOOK

: The cascaded dialing sequences described in the above

W91620 SERIES

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above examples will be dialed out only if they do not exceed a total of 32 digits. If the length of the
combined sequences oversteps 32 digits then redialing is inhibited.

Mixed Dialing

1. Definition of mixed dialing:

Mixed dialing is a combination of sequences of normal dialing, repertory dialing, and redialing. The
three examples given for cascaded dialing are also examples of mixed dialing, provided each
sequence is dialed out completely before the next sequence is entered.

2. There is no limitation on the number of digits and sequences in mixed dialing.

3. If a mixed dialing sequence includes redialing, the redialing is valid only as the first key-in.

ON HOOK

OFF HOOK

: The mixed dialing sequences described in the above

examples will be dialed out only if the total number of digits does not exceed 32. If the total
oversteps 32 digits, then redialing is inhibited.

Combination of Cascaded and Mixed Dialing

1. Cascaded dialing and mixed dialing can be combined; each follows the rules described above.

2. To apply redialing to combinations of cascaded and mixed dialing:

ON HOOK

OFF HOOK

: Redialing will be executed only if the total number of
digits

does not exceed 32. If the total oversteps 32 digits, then redialing is inhibited.

3. If n cascaded sequences with a total of 60 digits have been dialed, then for the (n+1)th cascaded

sequence, either one 4-digit normal dialing sequence or one complete repertory dialing sequence
(length up to 30 digits) may be dialed. The (n+2)th sequence is not accepted for cascaded dialing.

4. After a total of 64 digits of cascaded dialing, mixed dialing can be added.

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

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.

W91620 SERIES

Publication Release Date: December 1994

- 11 -

Revision A3

DC CHARACTERISTICS

OSC.

= 3.58 MHz, T

= 25

C, all outputs unloaded)

PARAMETER

SYM.

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Operating Voltage

2.0

5.5

Operating Current

Tone, V

= 2.5V

0.30

0.50

Pulse, V

= 2.5V

0.15

0.30

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

mVrms

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

= 2.5V

0.2

DP /C5 Output Sink
Current

= 0.5V

= 2.5V

0.5

P MUTE & T/P MUTE
Output Drive Current

= 2.0V

= 2.5V

0.2

P MUTE & T/P MUTE
Output Sink Current

= 0.5V, V

2.5V

0.5

Keypad Input Drive
Current

= 0V, V

= 2.5V

Keypad Input Sink
Current

= 2.5V, V

= 2.5V

200

400

Keypad Resistance

5.0

HKS I/P Pull High
Resistance

300

Input Voltage Low Level

Pins 1, 2, 3, 4, 10, 13,

0.2

Input Voltage High Level

15, 16, 17, 18

0.8

W91620 SERIES

Publication Release Date: December 1994

- 12 -

Revision A3

AC CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Keypad Active in Debounce

KID

Key Release Debounce

KRD

Pre-digit Pause

PDP1

Mode Pin =

Floating

33.3

10 ppS

Mode Pin = 1

Interdigit Pause (Auto Dialing)

IDP

10 ppS

800

Make/Break Ratio

M/B

M/B = 1:2

33:67

M/B = 2:3

40:60

DTMF Output Duration

Auto Dialing

Intertone Pause

ITP

Flash Break Time

100

Flash Pause

800

Pause Time

4.0

Pre-tone Mute

PTM

Notes

1. Crystal parameters suggested for proper operation are R

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.

W91620 SERIES

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TIMING WAVEFORMS

PDP

IDP

KID

PDP

KID

HKS

KEY IN

DP/C5

T/P MUTE

P MUTE

DTMF

OSC.

LOW

OSCILLATION

NORMAL DIALING

AUTO DIALING

Figure 1. Pulse Mode Timing Diagram

KID

KRD

ITP

KRD

ITP

PTM

HKS

KEY IN

DTMF

T/P MUTE

DP/C5

P MUTE

OSC.

HIGH

LOW

OSCILLATION

KID

ITP

Figure 2(a). Tone Mode Normal Dialing Timing Diagram

W91620 SERIES

Publication Release Date: December 1994

- 14 -

Revision A3

Timing Waveforms, continued

OSCILLATION

ITP

KID

PTM

HKS

KEY IN

DTMF

T/P MUTE

DP/C5

P MUTE

OSC.

LOW

HIGH

Figure 2(b). Tone Mode Auto Dialing Timing Diagram

B M

KID

PDP

IDP

PDP

IDP

LOW

OSCILLATION

HKS

KEY IN

DP/C5

T/P MUTE

DTMF

P MUTE

OSC.

Figure 3. Pause Function Timing Diagram

W91620 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: 852-27516023
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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