W91210 SERIES

TONE/PULSE DIALER WITH REDIAL FUNCTION

Publication Release Date: May 1995

- 1 -

Revision A3

GENERAL DESCRIPTION

The W91210 series are Si-gate CMOS ICs that provide the necessary signals for either pulse or tone
dialing. The W91210 series features a redial function.

FEATURES

DTMF/Pulse switchable dialer

One by 32 digits for redial memory

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

Uses 4

4 keyboard

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

Pause, P

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

Minimum tone output duration: 87 mS

Minimum intertone pause: 87 mS

Flash time (100 mS, 300 mS or 600 mS) selectable by keypad

Pause time 3.6 sec or 2.0 sec

On-chip power-on reset

Uses 3.579545 MHz crystal or ceramic resonator

Packaged in 16-pin plastic DIP

The different dialers in the W91210 series are described in the following table:

TYPE NO.

PULSE

(ppS)

FLASH (mS)

PAUSE

TIME (S)

M/B

PULSE-TO-TONE

PAUSE TIME

W91212

100/300/600

3.6

Yes

W91214/A

100/300/600

3.6/2.0

W91216

100/300/600

3.6

Yes

Note: W91214 designed for use in France, W91216 for Germany.

W91210 SERIES

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PIN CONFIGURATION

DTMF

HKS

MODE

T/P MUTE

DP/C4

W91212/W91214/W91214A/W91216

PIN DESCRIPTION

SYMBOL

16-PIN

I/O

FUNCTION

Column-

Row Inputs

The keyboard input may be from either the standard 4

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 by a

single row being connected to a single column.

XT, XT

6, 7

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 sequences 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, M/B = 2:3).
If the mode pin is left floating, the dialer is in pulse mode
(10 ppS, M/B = 1:2).

W91210 SERIES

Publication Release Date: May 1995

- 3 -

Revision A3

Pin Description, continued

SYMBOL

16-PIN

I/O

FUNCTION

HKS

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

by internal resistor.

DP /C4

N-channel open drain dialing pulse output (Figure 1). Flash key will
cause DP to be active in either tone mode or pulse mode.

DTMF

In pulse mode, remains in low state. 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

Error %

697

770

852

941

1209

1336

1477

Actual

699

766

848

948

1216

1332

1472

+0.28

-0.52

-0.47

+0.74

+0.57

-0.30

-0.34

, V

12, 5

Power input pins.

W91210 SERIES

- 4 -

BLOCK DIAGRAM

HKS

MODE

T/P MUTE

COLUMN

ROW

XT XT

DP/C4

(R1 to R4)

DTMF

SYSTEM CLOCK
GENERATION

READ/WRITE
COUNTER

RAM

LOCATION
LATCH

ROW & COLUMN
PROGRAMMABLE
COUNTER

DATA LATCH
& DECODER

KEYBOARD
INTERFACE

(C1 to C3)

D/A

CONVERTER

PULSE
CONTROL
LOGIC

CONTROL

LOGIC

FUNCTIONAL DESCRIPTION

Keyboard Operation

DP /C4

*/T

R/P

*/T: * and P

T key

R/P: Redial and pause function key

F1, F2, F3: Flash keys

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.

W91210 SERIES

Publication Release Date: May 1995

- 5 -

Revision A3

Redialing

OFF HOOK

, ...,

BUSY, Come

ON HOOK

OFF HOOK

R/P

The R/P

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

ecutes the pause function.

Access Pause

OFF HOOK

R/P

, ...,

1. The pause function can be stored in memory.

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

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

Pulse-to-tone (*/ T)

OFF HOOK

, ...,

*/T

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, * , D1', D2', ..., Dn'
(Tone)

(Tone) (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(a, b).

Flash

OFF HOOK

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

keyboard functions.

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

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

OFF HOOK

, ...,

LNB = D1, D2, D3, ..., Dn

OFF HOOK

, ...,

LNB = D3, ..., Dn

W91210 SERIES

- 6 -

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

0.30

1.0

Pulse

0.15

0.5

Standby Current

HKS = 0, No load & No key
enry

Memory Retention Current

HKS = 1, V

= 1.0V

0.2

DTMF Output Voltage

Row group, R

= 5 K

130

150

170

mVrm

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

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

500

Keypad Input Drive Current

= 0V

Keypad Input Sink Current

= 2.5V

200

400

Keypad Resistance

5.0

W91210 SERIES

Publication Release Date: May 1995

- 7 -

Revision A3

AC CHARACTERISTICS

PARAMETER

SYM.

CONDITIONS

MIN.

TYP.

MAX .

UNIT

Keypad Active in Debounce

KID

Key Release Debounce

KRD

Pre-digit Pause

PDP

Mode Pin = V

10 ppS

Mode Pin = Floating

33.3

Interdigit Pause (Auto dialing)

IDP

10 ppS

800

Make/Break Ratio

M/B

Mode Pin = V

40:60

Mode Pin = Floating

33:67

DTMF Output Duration

Auto Dialing

Intertone Pause

ITP

Auto Dialing

Flash Break Time

100

300

600

Flash Pause Time

1.0

Pause Time

W91212/214/216

3.6

W91214A

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

W91210 SERIES

- 8 -

TIMING WAVEFORMS

HKS

KEY IN

IDP

PDP

KID

R/P

PDP

T/P MUTE

PDP

OSCILLATION

OSC.

NORMAL DIALING

AUTO DIALING

T/P MUTE

LOW

DTMF

IDP

Figure 1. Pulse Mode Timing Diagram

Note: The dashed line is for W91216 only in pulse mode.

HKS

ITP

DTMF

ITP

KRD

KID

KRD

KEY IN

KID

T/P MUTE

HIGH

OSCILLATION

OSC.

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

W91210 SERIES

- 10 -

Timing Waveforms, continued

KID

PDP

IDP

*/T

KEY IN

HKS

T/P MUTE

OSCILLATION

OSC.

DTMF

T/P MUTE

Figure 4(a). P

T Operation Timing Diagram in Normal Dialing (W91212, W91216)

Note: The dashed line is for W91216 only.

KID

IDP

KEY IN

HKS

KID

*/T

T/P MUTE

PDP

DTMF

OSC.

OSCILLATION

Tone

Figure 4(b). P

T Operation Timing Diagram in Normal Dialing (for W91214/W91214A)

W91210 SERIES

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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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