Preliminary W91312N

TONE/PULSE DIALER WITH REDIAL FUNCTION

Publication Release Date: May 2000

- 1 - Revision A1

GENERAL DESCRIPTION

The W91312N are monolithic ICs that provide the necessary signals for either pulse or tone dialing.
The W91312 N feature a redial memory.

FEATURES

DTMF/Pulse switchable dialer

32 digits for redial memory

Pulse-to-tone (P

T) keypad for long distance call operation

Break/Make ratio is selectable by pin option

Uses 4

4 keyboard

Easy operation with redial, flash, pause, and P

T keypads

Pause, P

T (pulse-to-tone) can be stored as a digit in memory

Minimum tone output duration: 93 mS

Minimum intertone pause: 93 mS

On-chip power-on reset

Uses 3.579545 MHz crystal or ceramic resonator

Packaged in 18-pin plastic DIP

The different dialers in the W91310 series are shown in the following table:

TYPE NO.

PULSE (ppS)

FLASH (mS)

FLASH PAUSE (S)

PAUSE (S)

W91312N

10/20

600/100/300/73

1.0

3.6/2.0

PIN CONFIGURATION

DTMF

T/P MUTE

MODE

B/M

HKS

Preliminary W91312N

- 2 -

PIN DESCRIPTION

SYMBOL

PIN

I/O

FUNCTION

Column-

Row Inputs

The keyboard input may be from either the standard 4

keyboard or an inexpensive single contact (form A) keyboard.
Electronic input from a

C can also be used. A valid key entry 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 pulse and tone
mode dialing sequence and flash break. 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). Leaving

mode pin floating places the dialer in pulse mode (20 ppS).

HKS

Hook switch input. HKS = 1: On-hook state. Chip in sleeping
mode, no operation. HKS = 0: Off-hook state. Chip enabled for
normal operation. The HKS pin is pulled to V

by an internal

resistor.

N-channel open drain dialing pulse output (Figure 1). Flash key will
cause DP to go active in both pulse mode and tone mode.

DTMF

In pulse mode, remains in 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.

B/M

The break make ratio is 60:40 if B/M = 1 and is 66.6:33.3 if B/M =
0. This pin has no function in DTMF mode.

Preliminary W91312N

Publication Release Date: May 2000

- 3 - Revision A1

BLOCK DIAGRAM

HKS

T/P MUTE

COLUMN

ROW

(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

MODE

B/M

FUNCTIONAL DESCRIPTION

Keyboard Operation

1 2

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, the flash break time of F1 = 600 mS, F2 = 100 mS, F3 = 300 mS, F4 = 73

R: One-key redial function

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

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

Fn: F1, ..., F4

Preliminary W91312N

- 4 -

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.

Redialing

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

BUSY, COME

ON HOOK , OFF HOOK , R/P

The R/P key can execute redial function only as the first key-in after off-hook; otherwise, it will

execute pause function.

Access Pause

OFF HOOK , D1 , D2 , R/P , D3 , ..., Dn

1. The pause function can be stored in memory.

2. The pause function is executed in normal dialing or memory dialing.

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

Pulse-to-tone (

/T)

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

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

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

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

(Pulse) (Tone)

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

D1, D2, ..., Dn,

(Tone)

(Pause) (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 P

T function timing diagram is shown in Figure 4.

Flash

OFF HOOK , F

1. Flash key can't be stored as a digit in memory.

2. The system will return to the initial state after the break time is finished.

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

Preliminary W91312N

Publication Release Date: May 2000

- 5 - Revision A1

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

Operating Temperature

OPR

-20 to +70

Storage Temperature

STG

-55 to +125

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

DC CHARACTERISTICS

-V

= 2.5V, Fosc. = 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

0.3

0.5

Pulse

0.15

0.3

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

, V

= 2.0 to 5.5V

-30

-23

DTMF Output DC Level

TDC

= 5 K

, V

= 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

= 0.5V

0.5

HKS I/P Pull-high
Resistor

300

Preliminary W91312N

- 6 -

DC Characteristics, continued

PARAMETER

SYMBOL

CONDITIONS

MIN. TYP. MAX.

UNIT

Keypad Input Drive Current

= 0V

Keypad Input Sink Current

= 2.5V

200

400

Keypad Resistance

5.0

AC CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN. TYP. MAX.

UNIT

Keypad Active in Debounce

KID

Key Release Debounce

KRD

Pre-digit Pause

PDP

B/M = 1

10 ppS

B/M = 0

33.3

Pre-digit Pause

PDP

2 B/M = 1

20 ppS

B/M = 0

16.7

Interdigit Pause (Auto
dialing)

IDP

10 ppS

800

20 ppS

500

Make/Break Ratio

M/B

B/M = 1

40:60

B/M = 0

33:67

DTMF Output Duration

Auto Dialing

100

Intertone Pause

ITP

Auto Dialing

100

Flash Break Time

600

100

300

Flash Pause Time

1.0

Pause Time

Pause 1

3.6

Pause 2

2.0

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.

Preliminary W91312N

Publication Release Date: May 2000

- 7 - Revision A1

TIMING WAVEFORMS

HKS

KEY IN

T/P MUTE

PDP

IDP

OSCILLATION

NORMAL DIALING

DTMF

OSC.

LOW

OSCILLATION

KID

Figure 1(a). Pulse Mode Timing Diagram

HKS

KEY IN

R/P

T/P MUTE

PDP

IDP

OSCILLATION

AUTO DIALING

DTMF

OSC.

ON HOOK

LOW

Figure 1(b). Pulse Mode Timing Diagram

Preliminary W91312N

Publication Release Date: May 2000

- 9 - Revision A1

TIming Waveforms, continued

HKS

KEY IN

T/P MUTE

KID

PDP

IDP

OSCILLATION

DTMF

OSC.

R/P

IDP

LOW

Figure 3. Pause Function Timing Dragram

HKS

KEY IN

T/P MUTE

KID

PDP

IDP

OSCILLATION

DTMF

OSC.

*/T

Figure 4. Pulse-to-tone Function Timing Dragram

Preliminary W91312N

- 10 -

TIming Waveforms, continued

T/P MUTE

HKS

KID

DTMF

OSC.

KEY IN

Low

KID

ITP

OSCILLATION

Figure 5. Flash Function Timing Diagram

Headquarters

No. 4, Creation Rd. III,
Science-Based Industrial Park,
Hsinchu, Taiwan
TEL: 886-3-5770066
FAX: 886-3-5792766
http://www.winbond.com.tw/
Voice & Fax-on-demand: 886-2-27197006

Taipei Office

11F, No. 115, Sec. 3, Min-Sheng East Rd.,
Taipei, Taiwan
TEL: 886-2-27190505
FAX: 886-2-27197502

Winbond Electronics (H.K.) Ltd.

Unit 9-15, 22F, Millennium City,
No. 378 Kwun Tong Rd;
Kowloon, Hong Kong
TEL: 852-27513100
FAX: 852-27552064

Winbond Electronics North America Corp.
Winbond Memory Lab.
Winbond Microelectronics Corp.
Winbond Systems Lab.

2727 N. First Street, San Jose,
CA 95134, U.S.A.
TEL: 408-9436666
FAX: 408-5441798

Note: All data and specifications are subject to change withou t notice.

Headquarters

No. 4, Creation Rd. III,
Science-Based Industrial Park,
Hsinchu, Taiwan
TEL: 886-3-5770066
FAX: 886-3-5792766
http://www.winbond.com.tw/
Voice & Fax-on-demand: 886-2-27197006

Taipei Office

11F, No. 115, Sec. 3, Min-Sheng East Rd.,
Taipei, Taiwan
TEL: 886-2-27190505
FAX: 886-2-27197502

Winbond Electronics (H.K.) Ltd.

Unit 9-15, 22F, Millennium City,
No. 378 Kwun Tong Rd;
Kowloon, Hong Kong
TEL: 852-27513100
FAX: 852-27552064

Winbond Electronics North America Corp.
Winbond Memory Lab.
Winbond Microelectronics Corp.
Winbond Systems Lab.

2727 N. First Street, San Jose,
CA 95134, U.S.A.
TEL: 408-9436666
FAX: 408-5441798

Note: All data and specifications are subject to change withou t notice.

TYPICAL APPLICATION CIRCUIT

R5 10M

TIP

VR1

250V

D1-D4
1N4004

RING

ON HOOK

OFF HOOK

Q1
A94

33K

R4
3K3

R6
3K

D7
1N4148

SPEECH

D8
5V1

C1
100uF

Q2
A42

1N4148

200K

R9
470K

Q3
9013

Q4
C1815

R11
75

R10

NETWORK

300K

C10
0.1uF

VDD

R18
22K

VSS

XT T/P MUTE

W91312N

*/T

R/P1

3.58MHz

C5
30P

C6
30P

Q7
9013

4u7

10K

VDD

PULSE

TONE

B/M

R4 R3 R2

R1 VDD

HKS

DP DTMF

MODE

R/P2

VxR5

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