Datasheet W91621, W91620 Datasheet (Winbond Electronics)

W91620 SERIES

10-MEMORY TONE/PULSE DIALER WITH

TWO-STAGE REDIAL FUNCTION

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

W91621 3:2

100 mS

Publication Release Date: December 1994

- 1 - Revision A3

PIN CONFIGURATION

XT

MUTE

MUTE

W91620 SERIES

1 18 R4C1

C2

C3

C4

P MUTE

V

XT

XT

T/P MUTE

2

3

4

5

SS

6

7

8

9

R3

17

16

R2

15

R1

14

13

12 DTMF

11

10

DD

V

MODE

DP/C5

HKS

PIN DESCRIPTION

SYMBOL PIN NO. I/O FUNCTION

Column-

Row Inputs

1−4

&

15−18

I

Keyboard inputs are designed for use with either a standard 4 × 5
keyboard or an inexpensive single contact (Form A) keyboard.

Electronic input from a µC can also be used.
Valid key entry is defined by a connection between a single row and

a single column.

XT,

7, 8 I, O A built-in inverter provides oscillation with an inexpensive

3.579545 MHz crystal or ceramic resonator.

T/P

9 O

The T/P
during pulse and tone mode dialing sequence and flash break;
otherwise, it remains high.

MODE 13 I Mode pin.

Pull to VSS: Tone mode
Pull to VDD or leave floating: Pulse mode (10 ppS, M/B = 2:3 or 1:2)

is a conventional CMOS inverter output. It is low

- 2 -

Pin Description, Continued

HKS

HKS

HKS

HKS

DP/C5

SYMBOL PIN NO. I/O FUNCTION

10 I Hook switch input. Conventional CMOS input with an internal

protection diode and a pull-high resistor to VDD.

= 1: On-hook state. Chip in sleep mode, no operation.
= 0: Off-hook state. Chip enabled for normal operation.

W91620 SERIES

During dialing, this input ignores

= 1 for durations of less than

150 mS (i.e., dialing is not terminated).

11 O Open drain dialing pulse output (Figure 1).

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

DTMF 12 O 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 %

R1
R2
R3
R4

C1
C2
C3

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

VDD, VSS 14, 6 I Power input pins.

P MUTE 5 O The P MUTE is a conventional CMOS inverter output. It is high

during pulse dialing sequence and flash break. Otherwise, it
remains low.

Publication Release Date: December 1994

- 3 - Revision A3

BLOCK DIAGRAM

C1C2C3

C4

DP/C5

W91620 SERIES

XT

XT

ROW

(R1 to R4)

COLUMN

(C1 to C4)

DTMF

KEYBOARD
INTERFACE

D/A

CONVERTER

FUNCTIONAL DESCRIPTION

Keyboard Operation

HKS

MODE

READ/WRITE
COUNTER

RAM

LOCATION
LATCH

ROW & COLUMN
PROGRAMMABLE
COUNTER

SYSTEM CLOCK
GENERATION

CONTROL

LOGIC

PULSE
CONTROL
LOGIC

DATA LATCH
& DECODER

T/P MUTE

P MUTE

DP/C5

1 2 3 S

P→T
4 5 6 F P R2
7 8 9 A R3

* 0 # R R4

• S: Store function key

• F: Flash key

• P→T: In pulse mode, this key works as Pulse→Tone key

• R: Redial function key

• A: Indirect repertory dialing key

• P: Pause key

- 4 -

R1

W91620 SERIES

Normal Dialing

OFF HOOK , D1 , D2 , ..., Dn

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

1. OFF HOOK , D1 , D2 , ..., Dn , Busy,
Come

, R
The R key executes the redialing

function.

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

OFF HOOK , R , D1' , D2' ,

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'.

c. OFF HOOK , R (1st)

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

P→T, D3', D4' will be dialed out.

3. Ln content = D1, D2, P→T, D3, D4

OFF HOOK , A , Ln

, will dial out D1, D2, P→T, D3,
D4

P→T

, D3' , D4'

R (2 nd)

ON HOOK , OFF HOOK

then ON HOOK , OFF HOOK , R will dial out D1,

D2.

4. OFF HOOK , A , Lm , A , Ln , A , Lp

Busy, then ON HOOK , OFF HOOK , R

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

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.

- 5 - Revision A3

R key is pressed.

Publication Release Date: December 1994

W91620 SERIES

Number Store

1. OFF HOOK , S , D1 , D2 , ..., Dn , A , Ln , 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→T.
c. The store mode is released to the initial state only when all store operations are finished. There

is no need to
perform

For
example

then S , D1' , D2' , D3' , D4' , A , Lp ,
then S , ..., is still

But the following sequence is not valid:

S , D1 , D2 , D3 , D4 , A , Ln ,

then S , R , A , Ln

2. OFF HOOK , S , R , A , Ln , 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.

S , D1 , D2 , D3 , D4 , A , Ln ,

available.

ON HOOK , OFF HOOK to begin a second store

operation.

Memory Clear

OFF HOOK , S , A , Ln , S , A , Lp , ...

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

Repertory Dialing

OFF HOOK , A , Ln

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 , D1 , D2 , P , D3 , ..., Dn

- 6 -

W91620 SERIES

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.

Publication Release Date: December 1994

- 7 - Revision A3

Pulse-to-tone (P→T)

W91620 SERIES

1. 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.

2. OFF HOOK , R

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.

R (2nd)

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

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

P→T

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

3. OFF HOOK , A , Ln

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→T

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.

- 8 -

W91620 SERIES

Flash

OFF HOOK , D1 , D2 , D3 , F , D4 , D5 , D6

1. The F 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

redial register.

4. OFF HOOK , S , D1 , D2 , D3 , F , D4 , D5 , D6 , A ,
Ln then ON HOOK , OFF HOOK , A , Ln

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.

F key is not stored in the

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.

Example1:Normal dialing

¡Ï

Repertory dialing 1

¡Ï

Repertory dialing 2

¡Ï

...

¡Ï

Example2:Repertory dialing

Example3:Redialing

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.

5. ON HOOK , OFF HOOK , R : The cascaded dialing sequences described in the above

¡Ï

¡Ï

Normal dialing

Normal dialing

¡Ï

- 9 - Revision A3

¡Ï

Repertory dialing 2

Repertory dialing 1

Publication Release Date: December 1994

¡Ï

...

...

W91620 SERIES

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.

4. ON HOOK , OFF HOOK , R : 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 , R : 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

Input/Output Voltage VIH V

Power Dissipation PD 120 mW
Operating Temperature TOPR -20 to +70
Storage Temperature TSTG -55 to +150

VDD−VSS

VIL VSS -0.3 V

VOL VSS -0.3 V

VOH VDD +0.3 V

-0.3 to +7.0 V

+0.3 V

DD

°C
°C

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

- 10 -

W91620 SERIES

HKS

HKS

DP/C5

MUTE

MUTE

HKS

DC CHARACTERISTICS

(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, VDD = 2.5V - 0.30 0.50 mA

Pulse, VDD = 2.5V - 0.15 0.30

Standby Current ISB

Memory Retention
Current

DTMF Output Voltage VTO
Pre-emphasis Col/Row,

DTMF Distortion THD

DTMF Output DC Level VTDC

DTMF Output Sink
Current

Output Sink

Current
P MUTE & T/P

Output Drive Current
P MUTE & T/P

Output Sink Current
Keypad Input Drive

Current
Keypad Input Sink

Current
Keypad Resistance - - - 5.0

I/P Pull High

Resistance
Input Voltage Low Level VIL Pins 1, 2, 3, 4, 10, 13, 0 - 0.2

Input Voltage High Level VIH 15, 16, 17, 18 0.8

IMR

ITL VTO = 0.5V

IPL VPO = 0.5V

IMH VMO = 2.0V

IML VMO = 0.5V, VDD =

IKD VI = 0V, VDD = 2.5V 4 - -

IKS VI = 2.5V, VDD = 2.5V 200 400 -

= 0, No load & No

key entry

= 1, VDD = 1.0V

Row group, RL = 5 KΩ

VDD = 2.0 to 5.5V
RL = 5 KΩ

VDD = 2.0 to 5.5V
RL = 5 KΩ

VDD = 2.0 to 5.5V

VDD = 2.5V

VDD = 2.5V

VDD = 2.5V

2.5V

- - 300 -

- - 15

- - 0.2

130 150 170 mVrms

1 2 3 dB

- -30 -23 dB

1.0 - 3.0 V

0.2 - - mA

0.5 - - mA

0.2 - - mA

0.5 - - mA

VDD

- VDD V

VDD

µA

µA

µA

µA

KΩ
KΩ

V

Publication Release Date: December 1994

- 11 - Revision A3

W91620 SERIES

AC CHARACTERISTICS

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

Keypad Active in Debounce TKID - - 20 - mS
Key Release Debounce TKRD - - 20 - mS
Pre-digit Pause TPDP1 Mode Pin =

Floating

10 ppS Mode Pin = 1 - 40 ­Interdigit Pause (Auto Dialing) TIDP 10 ppS - 800 - mS
Make/Break Ratio M/B M/B = 1:2 - 33:67 - %

M/B = 2:3 - 40:60 ­DTMF Output Duration TTD Auto Dialing - 90 - mS
Intertone Pause TITP - 90 - mS
Flash Break Time TFB - - 100 - mS
Flash Pause TFP - - 800 - mS
Pause Time TP - - 4.0 - S
Pre-tone Mute TPTM - - 70 - mS

- 33.3 - mS

Notes:

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.

Publication Release Date: December 1994

- 12 - Revision A3

TIMING WAVEFORMS

HKS

W91620 SERIES

KEY IN

DP/C5

T/P MUTE

P MUTE

DTMF

OSC.

HKS

KEY IN

DTMF

3 2 R

T

KID

T

TPDP

IDP

PDPT

T

IDP

B

T

M

T

KID

T

PDP

T

LOW

OSCILLATION

OSCILLATION

NORMAL DIALING AUTO DIALING

Figure 1. Pulse Mode Timing Diagram

KRD

T

T

KID

PTM

T T

T

T

TD

KRD

ITP

T

KID

T

PTM

ITP

T

PDP

T

T

IDP

T

IDP

KRD

T

ITP

T

T/P MUTE

DP/C5

P MUTE

OSC.

HIGH

LOW

OSCILLATION OSCILLATION

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

- 13 -

Timing Waveforms, continued

W91620 SERIES

HKS

KEY IN

DTMF

T/P MUTE

DP/C5

P MUTE

OSC.

HKS

KEY IN

R

KID

T

PTM

T

ITP

T

T

TD

HIGH

LOW

OSCILLATION

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

2 P4

KID

T

2

ITP

T

DP/C5

T/P MUTE

DTMF

M

B

PDP

T

T

LOW

IDP

M

B

IDPT

T

P

IDPT

PDPT

P MUTE

OSC.

OSCILLATION

Figure 3. Pause Function Timing Diagram

Publication Release Date: December 1994 - 14 - Revision A3

Timing Waveforms, continued

KEY IN

DP/C5

HKS

4

B M

W91620 SERIES

P

2

T

KID

PDP

T

T

8

M B

IDP

IDP

T

T

T/P MUTE

DTMF

P MUTE

OSC.

HKS

KEY IN

DP/C5

T

ITP

OSCILLATION

Figure 4. P→T Operation Timing Diagram in Normal Dialing

LOW

F

KID

T

FB T

T

F

T

FP

3

TFP

IDP

T/P MUTE

P MUTE

DTMF

OSC.

LOW

OSCILLATION

Figure 5. Flash Operation Timing Diagram

W91620 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.

- 16 -

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]