Datasheet W91473L, W91473DL, W91473D, W91473CL, W91473C Datasheet (Winbond Electronics)

W91473 SERIES

14-MEMORY TONE/PULSE SWITCHABLE DIALER

WITH HANDFREE AND LOCK FUNCTIONS

GENERAL DESCRIPTION

The W91473 series are Si-gate CMOS IC tone/pulse switchable dialers containing a 14-channel automatic dialing memory, including a 16-digit × 3 emergency dialing memory and a 16-digit × 10 channel repertory memory that provides a 32-digit mercury memory. These dialers also provide flash, clear, hold, lock, and one-key redial functions.

FEATURES

• DTMF/Pulse switchable dialer

• 32-digit LNB (last number buffer) memory

• 32-digit mercury memory

• 16-digit × 3 one-touch direct repertory memory

• 16-digit × 10 direct repertory memory

• Uses 7 × 5 keyboard

• Flash time: 98 mS, 305 mS, or 600 mS (selectable by keypad option)

• 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 22, 24, or 28-pin plastic DIP

• The different dialers in the W91473 series are shown in the following table:

TYPE NO. PULSE

(ppS)

W91473 10 14 Yes Yes - - 22 W91473L 10 14 - - - Yes 22 W91473A 10 14 Yes Yes Yes - 24 W91473AL 10 14 - - Yes Yes 24 W91473B 10/20 14 Yes Yes Yes - 28 W91473BL 10/20 14 Yes Yes Yes Yes 28 W91473C 10/20 14 Save Memory Yes Yes - 28 W91473CL 10/20 14 Save Memory Yes Yes Yes 28 W91473D 10 14 Save Memory - - - 22 W91473DL 10 14 Save Memory - - Yes 22

MEMORY MERCURY

MEMORY

HOLD HANDFREE LOCK PACKAGE

Publication Release Date: February 1995

- 1 - Revision A3

PIN CONFIGURATIONS

W91473 SERIES

T/P MUTE

1

2

C2

3

C3

4

C4

5 18

C5

C6

6

C7

7

V

8

SS

9 14

XT

10

XT

11

W91473/D

1

C1

2

C2

C3

3

4

C4

5 18

C5

C6C76

7

V

8

SS

9 14

XT

10

XT

11 12

W91473L/DL

22C1

21

20

19

17

16

15

13

12

22

21

20

19

17

16

15

13

R5

R4

R3

R2

R1

HPM MUTE

V

DD

MODE

DTMF

DP

HKS

R5

R4

R3

R2

R1

LOCK

V

DD

MODE

DTMF

DP

HKS

T/P MUTE

1

2

C2

3

V

T/P MUTE

HFI

V

T/P MUTE

HFI

C3

C4

4

5 24

C5

C6C76

7

8

NC

9

KT

10

SS

11

XT

12

XT

13

14 1516HFO

W91473B/C

1

C2

2

C3

3

4

C4

5 24

C5

C6C76

7

NC

8

KT

9 20

SS

10

11

XT

12 17

XT

13

14

1

2

C2

3

C3

4

C4

5 20

C5

C6C76

7

V

SS

8

XT

9

10

XT

11

12

HFI

W91473A

1

2

C2

3

C3

4

C4

5 20

C5

C6

C767

V

8

SS

9 16

XT

10

XT

11

12

HFI

R5

24C1

R4

23

22

R3

21

R2

R1

19

HPM MUTE

V

18

DD

MODE

17

16

DTMF

15

DP

14

HKS

13

HFO

24C1

R5

R4

23

R3

22

R2

21

R1

19

LOCK

V

18

DD

17

MODE

DTMF

15

DP

14

HKS

13

HFO

W91473AL W91473BL/CL

28C1

27

26

25

2223NC

21

20

19

18

17

28C1

27

26

25

23

22

21

19

18

16

15

R5

R4

R3

R2

R1

HPM MUTE

DRS

V

DD

MODE

DTMF

DP

HKS

R5

R4

R3

R2

R1

HPM MUTE

LOCK

DRS

V

DD

MODE

DTMF

DP

HKS

HFO

- 2 -

W91473 SERIES

XT

MUTE

DP

HKS

PIN DESCRIPTION

SYMBOL 22-PIN 24-PIN 28-PIN I/O FUNCTION

Column-

Row

Inputs

XT,

T/P

MODE 15 17 19 I Pulling mode pin to VSS places the dialer

1−7

&

18−22

9, 10 9, 10 11, 12 I, O A built-in inverter provides oscillation with

11 11 13 O

13 15 17 O N-channel open drain dialing pulse output

1−7

&

20−24

1−8

&

24−28

I The keyboard input may be used with

either the standard 7 × 5 keyboard or an inexpensive single contact (form A) keyboard. Electronic input with µC can also be used. A valid key entry is defined by a single row being connected to a single column.

an inexpensive 3.579545 MHz crystal or ceramic resonator.

The T/P 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.

(Figure 1). Flash key causes DP to go active when in

pulse mode and tone mode.

in tone mode. Pulling mode pin to VDD places the dialer in pulse mode (10 ppS, M/B = 2:3). Leaving mode pin floating places the dialer in pulse mode (10 ppS, M/B = 1:2).

is a conventional CMOS

12 14 16 I Hook switch input.

= 1: On-hook state. Chip in sleep

mode, no operation.

= 0: Off-hook state. Chip enabled for

normal operation.

pin is pulled to VDD by internal

resistor.

Publication Release Date: February 1995

- 3 - Revision A3

W91473 SERIES

LOCK

Pin Description, continued

SYMBOL 22-PIN 24-PIN 28-PIN I/O FUNCTION

HPM

MUTE

17

(only for

W91473/D

)

19

(only for

W91473A)

23 O The HPM MUTE is a conventional

inverter output. During pulse dialing, flash, hold, and mercury mute functions, this pin will output an active high. It remains in a low state at all other times.

NC - - 8, 22

(W91473

B/C)

17

(W91473L

/DL)

19

(W91473

AL)

22

(W91473

BL/CL)

- No connection.

I

The function of the below:

LOCK PIN

V

DD

Floating

V

SS

pin is shown

FUNCTION

"0," " 9" dialing inhibited Normal dialing

"0" dialing inhibited

DTMF 14 16 18 O 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.

OUTPUT FREQUENCY

Specified

R1 R2 R3 R4 941 948

C1 C2 C3 1477

697 770 766 852

1209 1336 1332 -0.30

Actual

699 848

1216

1472

Error %

+0.28

-0.52

-0.47 +0.74 +0.57

-0.34

VDD, VSS 16, 8 1, 8 20, 10 I Power input pins.

- 4 -

W91473 SERIES

HFI

Pin Description, continued

SYMBOL 22-PIN 24-PIN 28-PIN I/O FUNCTION

, HFO

- 12, 13 14, 15 I, O Handfree control pins. A low pulse on the input pin toggles the handfree control

state. Status of the handfree control state is listed in the following table:

CURRENT STATE

Hook Sw. HFO

- Low On Hook Off Hook

Off Hook Off Hook

The

High Low No

High Low

- YesOff HookOn Hook Low High

pin is pulled to VDD by an

NEXT STATE

Input

¡õ

HFI

¡õ

HFI

¡õ

HFI

On Hook On Hook

Dialing

HFO High

Low Low High Yes

Yes

No

internal resistor.

KT - - 9 O Keytone signal output. The keytone will

be generated in all valid keys are pressed in tone mode. Frequency is 600 Hz and duration is 35 mS.

DRS - - 21 I Dial rate selection. This pin is pulled to

VDD by an internal resistor.

DRS

1

0

MODE

VDD

Floating

V

SS

V

DD

Floating

V

SS

TONE/PULSE

Pulse Pulse Tone Pulse Pulse Tone

DIAL

RATE

10 ppS 10 ppS

10 ppS 20 ppS

-

M/B

2:3 1:2

1:2 1:2

-

Publication Release Date: February 1995

- 5 - Revision A3

BLOCK DIAGRAM

XT

W91473 SERIES

XT

ROW

(R1 to R5)

COLUMN

(C1 to C7)

DTMF

K E Y B O A R D

I N T E R F A C E

D/A CONVERTER

HKS

LOCK

MODE

READ/WRITE COUNTER

RAM

LOCATION LATCH

ROW & COLUMN PROGRAMMABLE COUNTER

SYSTEM CLOCK GENERATOR

HFI

C O N T R O L

L O G I C

DRS

P U L S E

C O N T R O L

L O G I C

DATA LATCH & DECODER

KT T/P MUTE

HPM MUTE

HFO

DP

FUNCTIONAL DESCRIPTION

Keyboard Operation

C1 C2 C3 C4 C5 C6 C7

1 2 3 S M00 M05 EM1 R1 4 5 6 M01 M06 EM2 R2

7 8 9 CLR M02 M07 EM3 R3 */T 0 # R/P M03 M08 H R4 F1 F2 F3 R M04 M09 *MER R5

Note: *MER location in W91473C/CL or W91473D/DL is SAVE memory.

• S:Store function key

- 6 -

• F1, F2, F3: Flash keys

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

• R: One-key redial

• H: Hold function key

• M0j: Direct repertory memory

• EMi: One-touch memory for emergency call

• */T: * & P→T

• CLR: Clear key

• R/P: Redial and pause function key

• MER: One-touch memory for mercury code dialing

Note: Dn = 0 to 9, *, #, M0j = M00 to M09 (j = 0 to 9).

Normal Dialing

W91473 SERIES

OFF HOOK (or ON 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

1. OFF HOOK , D1 , D2 , ..., Dn BUSY, Come ON HOOK , OFF HOOK

(or ON HOOK &

or ON HOOK &

, R/P

The R/P key can execute redial function only as first key-in after off-hook. Otherwise, it will execute pause function.

2. OFF HOOK (or ON HOOK & a. The one-key redial function timing diagram is shown in Figure 4.

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

), R/P

, D1 , D2 , ..., Dn BUSY,

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

Come

to go low for 2.2 seconds. Break time and a 600 mS pause will automatically be added. c. If the R key is pressed before the pulses for the number dialed out are completed, it will be

ignored.

Publication Release Date: February 1995

- 7 - Revision A3

Number Store

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

W91473 SERIES

1. OFF HOOK (or ON HOOK &

S , Moj (or EMi or MER )

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

R/P and */T keys can be stored as a digit in memory. In store mode, R/P is the pause function key. The store mode can be released after the store function is executed or the state of the hook switch

is changed.

2. S , D1 , D2 , ..., Dn , S , 0 , j D1, D2, ..., Dn will be stored in memory location M0j and will not be dialed out.

3. OFFHOOK (or ON HOOK &

S , Mn a. D1, D2, ..., Dn will be stored in memory location and will be dialed out. b. The

4. D1 , D2 , ..., Dn , S , S , 0 , j

S

key must be pressed after completion of the dialing sequence.

), S , D1 , D2 , ..., Dn

), D1 , D2 , ..., Dn , S ,

D1, D2, ..., Dn will be stored in memory location M0j and will be dialed out.

Repertory Dialing

OFF HOOK (or ON HOOK &

), Moj (or EMi or MER )

Access Pause

OFF HOOK (or ON HOOK &

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 5.

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

- 8 -

Pulse-to-Tone (*/ T)

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

HFI

¡õ

W91473 SERIES

OFF HOOK (or ON HOOK &

*/T , D1' , D2'

1. If the mode switch is set to pulse mode, then the output signal will be: D1, D2, ..., Dn, Pause (3.6s), 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 6.

5. */ T key cannot be stored as a digit in memory.

, ...,

Dn'

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

Save

1. OFF HOOK (or ON HOOK &

S , SAVE

D1, D2, ..., Dn, will be stored in SAVE memory but will not be dialed out.

), S , D1 , D2 , ..., Dn

2. OFFHOOK (or ON HOOK &

S , SAVE

D1, D2, ..., Dn , will be stored in SAVE memory and will be dialed out.

3. OFF HOOK (or ON HOOK &

The content of SAVE memory will be dialed out.

), D1 , D2 , ..., Dn , S ,

), SAVE

Flash (F = F1, F2, F3)

OFF HOOK (or ON HOOK &

1. Flash key cannot be stored as a digit in memory and it has first priority among keyboard functions.

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 7.

), F

Publication Release Date: February 1995

- 9 - Revision A3

Clear key

Chain Dialing Buffer

1. CLR , R/P (or R )

Redial and one-key redial buffer will be cleared.

2. CLR , Moj

Location M0j buffer content will be cleared.

3. CLR , 0 , j

Location M0j buffer content will be cleared.

CHAIN DIALING

Relationship between the memory and the chain dialing buffer:

Memory

Digit

16 16

¡G ¡G

¡G

16

32

Location

M00

M01

¡G ¡G

M08 M09 EM1 EM2 EM3

Normal Dialing

Section 1

Section 2

Section 3

Section 4

W91473 SERIES

The chain dialing buffer may be divided into four sections, allowing up to four numbers to be dialed out in sequence. For example, if the user enters M01, M03, EM1, and normal dialing (manual dialing), the content of sections 1 to 4 will be M01, M03, EM1, and normal dialing (manual dialing). When numbers are entered into the chain dialing buffer, there is no need to wait until the previous dialing sequence has been completed. Numbers may be entered directly, one after the other, even while previous numbers are being dialed out.

1. Manual Dialing

Redial buffer content = Manual dialing + Repertory dialing.

2.

Repertory Dialing

Redial buffer content = Repertory dialing + Manual dialing.

3. Repertory Dialing

Redial buffer content = Repertory dialing + Repertory dialing.

4. Redialing

Redial buffer content = Redialing + Manual dialing.

¡Ï

Manual Dialing

Repertory Dialing

Manual Dialing

Repertory Dialing

- 10 -

W91473 SERIES

The primary redial content may not be manual dialing. Otherwise, the last redial content will be overwritten.

5. Redialing

Redial buffer content = Redialing + Repertory dialing. Redialing is valid only as the first key-in after off-hook or after the handfree dialing function is

toggled on. The second sequence should not be performed until the first sequence is completely dialed out.

¡Ï

Repertory Dialing

¡Ï

One key Redialing

¡Ï

M1

Manual Dialing (two sections of manual dialing)

One key Redialing

¡Ï

6. Manual Dialing

Redial buffer content = Manual dialing. The one-key redial may only be used after dialing out of a manual dialing sequence is completed.

7. Repertory Dialing 1(M1)

Repertory Dialing 2(M2)

or

Repertory Dialing 1(M1)

Repertory Dialing 2(M2) , ON HOOK , OFF HOOK , Redialing

M1 and M2 represent any of the repertory dialing memories. The first redialing will dial out M1; the second will dial out M1, M2. If dialing out of the repertory dialing memories has not been completed, the one-key redial key will

be ignored. Dialing of the second repertory dialing memory (M2) should not be performed until the one-key

redialing operation is completed. Notes: Chain dialing (cascaded dialing) allows for memory or manual dialing while a previous dialing

sequence is still being dialed out.More than one sequence of manual dialing is not permitted. Entering more than one manual dialing sequence will inhibit redialing. Chain dialing of more than four sections is not permitted.

Manual Dialing

If more than four sections are entered, all sections after the fourth section will be ignored and redialing will be inhibited.

Manual Dialing and inhibit redial) There is a 2.0 sec. inter-chain dialing pause for cascaded dialing.

¡Ï

M1

¡Ï

M2

¡Ï

M3

- 11 - Revision A3

M4 (over 4 sections, ignore M4

Publication Release Date: February 1995

W91473 SERIES

MERCURY DIALING

1. Up to 32 digits may be stored.

2. Mercury dialing is activated only as the first key-in after off-hook or handfree dialing is activated.

3. The timing diagram for the mercury memory function is given below.

KEY IN

DP

T/P MUTE

DTMF

HPM MUTE

OSC.

MER

T

IDP

OSCILLATION

Mercury Function Timing Diagram

T

P

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 Operating Temperature TOPR -20 to +70 Storage Temprature TSTG -55 to +125

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

of the device.

°C °C

- 12 -

W91473 SERIES

IOP

mA

ISR

HKS

--15µA

HKS

DP

MTUE

IMI

VMO = 0.5V

0.5--

mA

IHPMI

VTO = 0.5V

0.5--

mA

IHPMH

VTH = 2.0V

0.5--

mA

HKS

Key Tone Output Current

mA

HFO Drive/Sink Current

mA

DC CHARACTERISTICS

(VDD−VSS = 2.5V, Fosc. = 3.58 MHz, Ta = 25° C, all outputs unloaded)

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

Operating Voltage VDD 2.0 - 5.5 V Operating Current

Standby Current

Memory Retention Current IMR DTMF Output Voltage VTO

Pre-emphasis - Col/Row,

DTMF Distortion THD

DTMF Output DC Level VTDC

DTMF Output Sink Current ITL VTO = 0.5V 0.2 - - mA

Output Sink Current

IPL VPO = 0.5V 0.5 - - mA

Tone - 0.3 0.5 Pulse - 0.15 0.3

= 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

- - 0.2

130 150 170 VrmS

1 2 3 dB

- -30 -23 dB

1.0 - 3.0 V

µA

T/P Current

HPM MUTE Output Sink Current

HPM MUTE Output drive Current

Keypad Input Drive Current IKD VI = 0V 30 - Keypad Input Sink Current IKS VI = 2.5V 200 400 Keypad Resistance - - 5.0

Output Sink

I/P Pull-high Resistor

RKH - 300 IKTH VKTH = 2.0V 0.5 - -

IKTL VKTH = 0.5V 0.5 - IHFH VHFH = 2.0V 0.5 - IHFL VHFL = 0.5 0.5 - -

KΩ

µA µA

KΩ

Publication Release Date: February 1995

- 13 - Revision A3

W91473 SERIES

Pre-digit Pause

mS

Pre-digit Pause

mS

Interdigit Pause (Auto dialing)

TIDP

mS

Make/Break Ratio

M/B

%

AC CHARACTERISTICS

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

Keypad Active in Debounce TKID - - 20 - mS Key Release Debounce TKRD - - 20 - mS

1

2

Tone Output Duration TTD Auto Dialing - 93 - mS Intertone Pause TITP Auto Dialing - 93 - mS

TPDP1 M/B = 2/3 - 40 -

10 ppS M/B = 1/2 - 33.3 -

TPDP2 M/B = 2/3 - 20 -

20 ppS M/B = 1/2 - 16.7 -

10 ppS - 800 -

20 ppS - 500 M/B = 2/3 - 40:60 M/B = 1/2 - 33:67 -

- 98 -

Flash Break Time TFB - - 305 - mS

- 600 Pause Time TP - - 3.6 - S Key Tone Frequency FKT - - 600 - Hz Key Tone Duration TKTD - - 35 - mS One-key Redialing Pause Time TPR - - 600 - mS One-key Redialing Break Time TRB - - 2.2 - S First key-in Pause Time TFKP - - 600 - mS

Notes:

1. Crystal parameters suggested for proper operation are Rs < 100Ω, 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.

TIMING WAVEFORMS

- 14 -

HKS

W91473 SERIES

KEY IN

T/P MUTE

HPM MUTE

DTMF

OSC.

KEY IN

DTMF

DP

KT

HKS

4

T

KID

B

T

PDP

2

M

T

IDP

T

IDP

2

T

KID

T

IDP

T

PDP

LOW

T

FKP

OSCILLATION

Figure 1. Pulse Mode Diagram (Normal Dialing)

T

KID

T

ITP

T

TD

KRD

T

ITP

T

KID

T

KRD

T

ITP

T/P MUTE

HPM MUTE

KT

DP

T

OSC.

Timing waveforms, continued

LOW

HIGH

FKP

OSCILLATION OSCILLATION

Figure 2. Tone Mode Diagram (Normal Dialing)

Publication Release Date: February 1995

- 15 - Revision A3

W91473 SERIES

HKS

OFF HOOK

HFI

H KEY

HFO

T/P MUTE

HPM MUTE

CHIP ENBLE

_____ Note: The H KEY cannot be enabled when chip is disabled.

HKS

ON HOOK

HIGH

LOW

Figure 3(a).

OFF HOOK

HFI

H KEY

HFO

T/P MUTE

HPM MUTE

CHIP ENBLE

HIGH

Figure 3(b).

___ _____ ___ _____ Note: The HFI and H KEY inputs will toggle the HFO signal; as soon as either HFI or H KEY is activated, the HFO signal will

go high and previous inputs will be ignored.

- 16 -

Timing waveforms, continued

HKS

W91473 SERIES

HKS

HFI

H KEY

HFO

T/P MUTE

HPM MUTE

CHIP ENBLE

Note: Changing the state of the

HKS

ON HOOK

HIGH

Figure 3(c).

signal from high to low will initialize the HFO and HPM MUTE signals.

LOW

KEY IN

DP

T/P MUTE

HPM MUTE

DTMF

OSC.

R

T

KID

T

RB

T

IDP

T

PDP

KT

LOW

T

FKP

OSCILLATION

Figure 4. Pulse Mode One-key Redialing Timing Diagram (when not first key)

Publication Release Date: February 1995

- 17 - Revision A3

T

IDP

Timing waveforms, continued

HKS

W91473 SERIES

KEY IN

DP

T/P MUTE

HPM MUTE

KT

DTMF

OSC.

HKS

4

2

R/P

KID

T

MB

BM

T TIDPIDP

T

PDP

2

IDP

T

PDP

P

T

LOW

T

FKP

OSCILLATION

Figure 5. Pause Function Timing Diagram

KEY IN

DP

T/P MUTE

HPM MUTE

KT

DTMF

OSC.

4

2

KID

T

MB

*/T

B

M

T T

T

PDP

T

FKP

8

IDPIDP

T

P

T

IDP

OSCILLATION

Figure 6. Pulse-to-Tone Function Timing Diagram

- 18 -

Timing waveforms, continued

W91473 SERIES

HKS

KEY IN

DP

T/P MUTE

HPM MUTE

KT

DTMF

OSC.

LOW

F

FB

T

LOW

FKP

T

OSC.

Figure 7. Flash Operation Timing Diagram

Publication Release Date: February 1995

- 19 - Revision A3

W91473 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: 852-27516023 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.

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

Publication Release Date: February 1995

- 21 - Revision A3