Datasheet W91521N, W91521AN, W91520N, W91520AN Datasheet (Winbond Electronics)

Page 1

W91520N SERIES

TONE/PULSE DIALER WITH HANDFREE

AND HOLD FUNCTIONS

GENERAL DESCRIPTION

The W91520N series are Si-gate CMOS ICs that provide the necessary signals for tone or pulse dialing. The W91520N series provide one-key redial, handfree dialing, hold, save, and redial functions.

FEATURES

•

DTMF/pulse switchable dialer

•

Two by 32-digit redial and save memory

•

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

•

Uses 5 × 5 keyboard

•

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

•

Pause, pulse-to-tone (*/T) can be stored as a digit in memory

• On-hook debounce time: 150 mS

•

Dialing rate (10 ppS, or 20 ppS) selectable by bonding option

•

Minimum tone output duration: 93 msec.

•

Minimum intertone pause: 93 msec.

•

Flash break time (73, 100, 300, 600 msec.) selectable by keypad; pause time is 1.0 sec.

•

On-chip power-on reset

•

Uses 3.579545 MHz crystal or ceramic resonator

•

Packaged in 18 or 20-pin plastic DIP

• The different dialers in the W91520N series are shown in the following table:

TYPE NO. REPLACEMENT

TYPE NO.

W91520N W91520 10 600/100/300/73 Pin - 18 W91521N W91521 20 600/100/300/73 Pin - 18 W91520AN W91520A 10 600/100/300/73 Pin Yes 20 W91521AN W91521A 20 600/100/300/73 Pin Yes 20

PULSE

(ppS)

FLASH

(mS)

M/B HANDFREE

DIALING

Publication Release Date: May 1997

- 1 - Revision A3

PACKAGE

(PINS)

Page 2

PIN CONFIGURATIONS

MUTE

C2 C3 C4

H/P MUTE

SSV

T/P MUTE

W91520N SERIES

R4 R3

MODE

15 14

DTMF

DP/C5

HKS

HFO

H/P MUTE

T/P MUTE

HFI

C3 C4

4 5 6

2 3 4 5 6

R4 R3

15 14

MODE

DTMF

DP/C5

HKS

W91520N/W91521N

W91520AN/W91521AN

PIN DESCRIPTION

SYMBOL 18-PIN 20-PIN I/O FUNCTION

ColumnRow Inputs

XT,

T/P

1−4

15−18

1−4

17−20

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

9 9 O

MODE 13 15 I Pulling mode pin to VSS places the dialer in tone

The keyboard inputs may be used with either a standard 5 × 5 keyboard or an inexpensive single

contact (Form A) keyboard. Electronic input from a µC can also be used. A valid key-in is defined as a single row being connected to a single column.

inexpensive 3.579545 MHz crystal or ceramic resonator.

The T/P

is a conventional CMOS N-channel

open drain output. The output transistor is switched on during dialing

sequence, one-key redial break, and flash break time. Otherwise, it is switched off.

mode. Pulling mode pin to VDD places the dialer in pulse

mode (10 ppS; 20 ppS for W91521N/521AN, M/B = 40:60).

Floating mode pin places the dialer in pulse mode (10 ppS; 20 ppS for W91521N/521AN, M/B =

33.3:66.7).

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Page 3

W91520N SERIES

HKS

DP/C5

R1R2R3

Pin Description, continued

SYMBOL 18-PIN 20-PIN I/O FUNCTION

10 12 I Hook switch input.

= VDD: On-hook state. Chip in sleeping mode, no

operation.

= VSS: Off-hook state. Chip is enabled for normal

operation.

pin is pulled to VDD by internal resistor.

11 13 O 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, c).

VDD, VSS 14, 6 16, 6 I Power input pins.

H/P MUTE 5 5 O The H/P MUTE is a conventional inverter output.

During pulse dialing, flash break, one-key redial break, and hold period, this output is active high; otherwise, it remains in low state.

DTMF 12 14 O In pulse mode, this pin remains in low state at all times.

In the tone mode, it will output a dual or single tone. Detailed timing diagram for tone mode is shown in

Figure 2(a, b, c).

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

Publication Release Date: May 1997

- 3 - Revision A3

Page 4

W91520N SERIES

HFI

HFO

HFI

Pin Description, continued

SYMBOL 18-PIN 20-PIN I/O FUNCTION

, HFO

- 10, 11 I, O Handfree control pins. The handfree control state is toggled on by a low pulse on the

status of the handfree control state is described in the following table:

input pin. The

BLOCK DIAGRAM

CURRENT STATE

Hook SW. HFO

On Hook Off Hook

Low High

High

NEXT STATE

Input

HFI HFI HFI

High Low No Low Yes

Dialing

Yes

On Hook Off Hook Low Yes Off Hook

Off Hook

Low High

On Hook On Hook

Low

High Yes

pin is pulled to VDD by an internal resistor.

Detailed timing diagrams are shown in Figure 3.

XT XT

SYSTEM CLOCK

GENERATOR

HKS HFI

ROW

(R1 to R4, Vx)

COLUMN

(C1 to C4)

DTMF

KEYBOARD

INTERFACE

D/A

CONVERTER

LOCATION

LATCH

ROW & COLUMN

PROGRAMMABLE

COUNTER

- 4 -

READ/WRITE

COUNTER

RAM

DATA LATCH

& DECODER

CONTROL

LOGIC

PULSE

CONTROL

LOGIC

MODE

H/P MUTE T/P MUTE

DP/C5 HFO

Page 5

FUNCTIONAL DESCRIPTION

DPC5/

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

Keyboard Operation

C1 C2 C3 C4

1 2 3 SAVE R1 4 5 6 F1 R2 7 8 9 F2 H R3

W91520N SERIES

∗/T

0 # R/P1 R R4

R/P2 R F3 F4 VX

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

• H: Hold function key

• SAVE: Save function key

• R: One-key redial function

Notes: D1, ..., Dn, D1', ..., Dn': 0, ..., 9, */T, # R/P: R/P1 or R/P2. Fn: F1, ..., F4

Normal Dialing

OFF HOOK (or ON HOOK &

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

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

), D1 , D2 , ..., Dn

Redialing

1. OFF HOOK (or ON HOOK &

, OFF HOOK (or ON

HOOK

), D1 , D2 , ..., Dn , Busy, Come

), R/P

a. The redial memory content will be dialed out. b. The R/P key can execute the redial function only as the first key-in after off-hook; otherwise, it

executes pause function.

c. If redialing length exceeds 32 digits, the redialing function will be inhibited.

2. OFF HOOK (or ON HOOK &

), D1 , D2 , ..., Dn , Busy, R

a. The one-key redialing function timing diagram is shown in Figure 4.

Publication Release Date: May 1997

- 5 - Revision A3

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W91520N SERIES

HFI

¡õ

HFI

¡õ

HFI

¡õ

b. If the dialingofD1 to Dn is finished, pressing the R key will cause the pulse output pin

go low for 2.2 seconds break time and 0.6 seconds pause time will automatically be added.

c. If the pulses of the dialed digits D1 to Dn have not finished, R will be ignored.

d. The redial function by R key has no break time (2.2 sec.) if it is the first key-in after off-hook.

e. The R key uses the same redial buffer as the redial function by

the

and it is active during normal dialing or repertory dialing.

R/P1 or R/P2 key,

Access Pause

OFF HOOK (or ON HOOK &

1. The pause function is executed in normal dialing, redial dialing, or memory dialing.

2. The pause duration of 2.0 or 3.6 seconds per pause is selected by keypad, but only one pause time can be stored in memory

3. A detailed timing diagram for the pause function is shown in Figure 5.

), D1 , D2 , R/P , D3 , ..., Dn

Pulse-to-tone (*/T)

OFF HOOK (or ON HOOK &

, D2' , ..., Dn'

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

D1, D2, ..., Dn, Pause (2.0 sec. or 3.6 sec.), D1', D2', ..., Dn' (Pulse) (Tone )

), D1 , D2 , ..., Dn , */T , D1'

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

D1, D2, ..., Dn, *, D1', D2', ..., Dn' (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 pulse-to-tone function timing diagram is shown in Figure 6.

Save

OFF HOOK (or ON HOOK &

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

2. If the sequence of the dialed digits D1, D2, ..., Dn has not SAVE will be ignored;

), D1 , D2 , ..., Dn , SAVE

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Page 7

finished,

HFI

¡õ

HFI

¡õ

otherwise, D1, D2, ..., Dn will be duplicated to the save memory.

Flash

W91520N SERIES

OFF HOOK (or ON HOOK &

1. Fn = F1, ..., F4

2. The dialer will execute a flash break time of 600 mS (F1), 100 mS (F2), 300 mS (F3), or 73 mS

(F4). In each case the flash pause time is 1.0 sec. before the next digit is dialed out.

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

keyboard functions.

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

5. The flash function timing diagram is shown in Figure 7.

), Fn

HOLD

OFF HOOK (or ON HOOK &

The HOLD is switched on and off by hold key. The other keypads will be disabled when in hold mode. The function timing diagram is shown in Figure 3(a, b, c).

), H

ABSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL RATING UNIT

DC Supply Voltage VDD−VSS -0.3 to +7.0 V Input/Output Voltage VIL VSS -0.3 V

VIH VDD +0.3 V VOL VSS -0.3 V VOH VDD +0.3 V

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

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

- 7 - Revision A3

°C °C

Publication Release Date: May 1997

Page 8

DC CHARACTERISTICS

HKS

MUTE

HKS

(VDD−VSS = 2.5V, FOSC. = 3.579545 MHz, TA = 25° C, all outputs unloaded)

W91520N SERIES

PARAMETER SYMBOL CONDITIONS MIN.

TYP.

Operating Voltage VDD - 2.0 - 5.5 V Operating Current IOP Tone, Unloaded - 0.4 0.6 mA

Pulse, Unloaded - 0.2 0.4

Standby Current ISB

Memory Retention Current

DTMF Output Voltage VTO Row group,

Pre-emphasis Col/Row,

DTMF Distortion THD

DTMF Output DC Level VTDC

DTMF Output Sink Current

Output Sink Current

IMR

ITL VTO = 0.5V 0.2 - - mA

IPL VPO = 0.5V 0.5 - - mA

= VSS, No load

& No key entry

= VDD,

VDD = 1.0V

RL = 5 KΩ

VDD = 2.0 to 5.5V RL = 5 KΩ,

VDD = 2.0 to 5.5V

- - 15

- - 0.2

130 150 170 mVrms

1 2 3 dB

- -30 -23 dB

1.0 - 3.0 V

MAX. UNIT

µA

T/P Current

H/P MUTE Output IHPH VHPH = 2.0V 0.5 - - mA Drive/Sink Current

HFO Drive/Sink Current IHFH VHFH = 2.0V 0.5 - - mA

Keypad Input Drive Current

Keypad Input Sink Current

Resistor Keypad Resistance RK - - - 5

Output Sink

I/P Pull-high

ITML VTMO = 0.5V 0.5 - - mA

IHPL VHPL = 0.5V 0.5 - - mA

IHFL VHFL = 0.5V 0.5 - - mA

IKD VI = 0.0V 30 - -

IKS VI = 2.5V 200 400 -

RHK - - 300 -

- 8 -

µA

KΩ

Page 9

W91520N SERIES

AC CHARACTERISTICS

(VDD−VSS = 2.5V, FOSC. = 3.579545 MHz, TA = 25° C, all outputs unloaded)

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

Key-in Debounce TKID - - 20 - mS Key Release Debounce TKRD - - 20 - mS On-hook Debounce TOHD - - 150 - mS Pre-digit Pause

Pre-digit Pause

Interdigit Pause TIDP 10 ppS - 800 - mS (Auto Dialing) 20 ppS - 500 Make/Break Ratio M:B Mode = VDD - 40:60 - %

TPDP1 Mode = VDD - 40 - mS

10 ppS Mode = Floating - 33.3 -

TPDP2 Mode = VDD - 20 - mS

20 ppS Mode = Floating - 16.7 -

Mode = Floating - 33.3:66.7 Tone Output Duration TTD Auto dialing - 93 - mS Intertone Pause TITP Auto dialing - 93 - mS Flash Break Time TFB F1 - 600 -

F2 - 100 - mS

F3 300

F4 - 73 Flash Pause Time TFP F1, F2, F3, F4 - 1.0 - S Pause Time TP R/P1 - 3.6 - S

R/P2 - 2.0 One-key Redial Break

TRB - - 2.2 - S

Time One-key Redial Pause

TRP - - 600 - mS

Time

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: May 1997

- 9 - Revision A3

Page 10

TIMING WAVEFORMS

OSCILLATION

HKS

KEY IN

T/P MUTE

H/P MUTE

W91520N SERIES

KID

IDP

PDP

M B

IDP

KRD

KID

IDP

PDP

DTMF

OSC.

HKS

KEY IN

T/P MUTE

H/P MUTE

DTMF

Low

OSCILLATION

Figure 1(a) Normal Dialing Timing Diagram

KID

PDP

KRD

Low

IDP

M B

IDP

R/P

T< T

OHD

IDP

OSC.

OSCILLATION

Figure 1(b) Pulse Mode Auto Dialing Timing Diagram

- 10 -

Page 11

Timing Waveforms, continued

OSCILLATION

W91520N SERIES

HKS

KEY IN

T/P MUTE

H/P MUTE

DTMF

OSC.

HKS

KEY IN

DTMF

T/P MUTE

KRD

KID

IDP

PDP

R/P

Low

OSCILLATION

Figure 1(c) Pulse Mode Auto Dialing Timing Diagram

KID

ITP

T = T

OHD

KRD

ITP

H/P MUTE

OSC.

High

Figure 2(a) Tone Mode Normal Dialing Timing Diagram

Publication Release Date: May 1997

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Page 12

Timing Waveforms, continued

OSCILLATION

W91520N SERIES

HKS

KEY IN

DTMF

T/P MUTE

H/P MUTE

OSC.

HKS

KEY IN

DTMF

T/P MUTE

< T

KRD

OHD

R/P

KID

ITP

High

Figure 2(b) Tone Mode Auto Dialing Timing Diagram

T = T

OHD

R/P

KRD

KID

ITP

H/P MUTE

OSC.

High

OSCILLATION

Figure 2(c) Tone Mode Auto Dialing Timing Diagram

- 12 -

Page 13

Timing Waveforms, continued

HKS

W91520N SERIES

KEY IN

MODE

DTMF

MUTE

T/P

H/P MUTE

HFI

HFO

OSC

1 2

H H

Figure 3. Handfree Function Timing Diagram

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Publication Release Date: May 1997

Page 14

Timing Waveforms, continued

OSCILLATION

HKS

W91520N SERIES

KEY IN

HFI

HFO

T/P MUTE

H/P MUTE

DTMF

OSC.

KID

PDP

KID

IDP

Low

Figure 4. One-key Redial Timing Diagram

IDP

PDPT

HKS

KEY IN

T/P MUTE

H/P MUTE

DTMF

OSC.

R/P

KID

PDP

Low

OSC

Figure 5. Pause Function Timing Diagram

- 14 -

IDP

PDP

Page 15

Timing Waveforms, continued

HKS

KEY IN

T/P MUTE

H/P MUTE

DTMF

OSC. OSCILLATION

W91520N SERIES

*/T 3

KID

PDP

IDP

HKS

KEY IN

HFI

HFO

T/P MUTE

H/P MUTE

DTMF

OSC.

Figure 6. Pulse-to-tone Timing Diagram

Low

KID

OSCILLATION

KID

ITP

Figure 7. Flash Timing Diagram

- 15 - Revision A3

Publication Release Date: May 1997

Page 16

W91520N SERIES

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

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

Taipei Office

11F, No. 115, Sec. 3, Min-Sheng East Rd., Taipei, Taiwan TEL: 886-2-7190505 FAX: 886-2-7197502

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: 1-408-9436666

FAX: 1-408-9436668