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W91F840N SERIES 23-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS
GENERAL DESCRIPTION
The W91F840N is a series of tone/pulse switchable telephone dialers with 23-flash memory, keytone, two store key function, hold, lock, mute, volume control and handfree dialing control features. These chips are fabricated using Winbond's high-performance CMOS technology and thus offer good performance in low-voltage, low-power operations.
FEATURES
* * * * * * * * * * * * * * * * * * * * * * * * *
Tone/pulse switchable dialer Two by 32 digits redial and save memory Three by 32 digits one-touch direct repertory flash-memory Twenty by 32 digits one-touch direct or two-touch indirect repertory flash-memory 4 The read-write times: 10 Pulse-to-tone (*/T) keypad for long distance call operation Chain dialing Uses 6 x 6 or 7 x 7 keyboard Easy operation with redial, flash, pause, and */T keypads Pause, PT (pulse-to-tone) can be stored as a digit in memory Dialing rate: 10 or 20 ppS by mask option Minimum tone output duration: 93 mS Minimum intertone pause: 93 mS Pause time: 3.6 sec. Two store key function. (S1 and S2) Flash break time (100 mS, 300 mS, or 600 mS) selectable by keypad; pause time is 1.0 S Make/break ratio (2:3 or 1:2) selectable by MODE pin Mute key for speech network mute No key will be accepted except the "HOLD" key when in the Hold mode 4-level volume control by V1 and V2 pin - default value is zero Key tone output for valid keypad entry recognition On-chip power-on reset Uses 3.579545 MHz crystal or ceramic resonator 22-pin 400 mil, 24-pin 600 mil or 28-pin 600 mil dual-in-line plastic package The different dialers in the W91F840N series are shown in the following table:
TYPE NO. W91F840N W91F840AN W91F840LN W91F840ALN W91F841AN W91F841ALN W91F842N W91F842AN PULSE (ppS) 10 10 10 10 10 10 20 20 FLASH-MEMORY 13 one touch, 10 two touch 13 one touch, 10 two touch 13 one touch, 10 two touch 13 one touch, 10 two touch 23 one touch 23 one touch 13 one touch, 10 two touch 13 one touch, 10 two touch 23 one touch LOCK
KEY TONE

HANDFREE DIALING

VOLUME CONTROL

-
-
PACKAGE (PINS) 22 24 22 24 28 28 22 24
W91F843AN
20
-
28
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
PIN CONFIGURATIONS
C1 C2 C1 C1 C2 C3 C4 C5 KT H/P MUTE VSS XT XT T/P MUTE 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 R6 R4 R3 R2 R1 K MUTE V DD MODE DTMF DP HKS C2 C3 C4 C5 KT H/P MUTE VSS XT XT T/P MUTE HFI 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 R6 R4 R3 R2 R1 K MUTE V DD MODE DTMF XT DP T/P MUTE HKS HFO HFI V1 C3 C4 C5 C6 KT H/P MUTE VSS XT
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
R7 R6 R4 R3 R2 R1 K MUTE VDD MODE DTMF DP HKS HFO V2
W91F840N/F842N
W91F840AN/F842AN
W91F841AN/F843AN
C1 C2 C1 C1 C2 C3 C4 C5 LOCK H/P MUTE VSS XT XT T/P MUTE 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 R6 R4 R3 R2 R1 K MUTE VDD MODE DTMF DP HKS C2 C3 C4 C5 LOCK H/P MUTE VSS XT XT T/P MUTE HFI 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 R6 R4 R3 R2 R1 K MUTE VDD MODE DTMF XT DP T/P MUTE HKS HFI HFO V1 C3 C4 C5 C6 LOCK H/P MUTE VSS XT
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
R7 R6 R4 R3 R2 R1 K MUTE VDD MODE DTMF DP HKS HFO V2
W91F840LN
W91F840ALN
W91F841ALN
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W91F840N SERIES
PIN DESCRIPTION
SYMBOL ColumnRow Inputs 22-PIN 1-5 & 18-22 24-PIN 1-5 & 20-24 28-PIN 1-6 & 23-28 I/O I FUNCTION The keyboard input is compatible with a standard 6 x 6 or 7 x 7 keyboard, an inexpensive single contact (Form A) keyboard, and electronic input. In normal operation, any single button can be pushed to produce dual tone, pulses, or functions. Activation of two or more buttons will result in no response except for a single tone. XT 9 9 10 I A built-in inverter together with an inexpensive 3.579545 MHz crystal supplies the oscillator. The oscillator stops when there is no keypad input. The crystal frequency deviation is 0.02%. Crystal oscillator output pin. The T/P MUTE is a conventional CMOS N-channel open drain output. The output transistor turns on with a low level during a dialing sequence (both pulse and tone mode). Otherwise, it is off. K MUTE 17 19 22 O The K MUTE is a conventional CMOS N-channel open drain output. Toggle action speech mute control pin by MUTE key. Connecting the mode pin to VSS places the dialer in tone mode. Connecting the mode pin to VDD places the dialer in pulse mode with an M/B ratio of 40:60. Leaving the mode pin floating places the dialer in pulse mode with an M/B ratio of 33.3:66.7. HKS 12 14 17 I The HKS (hook switch) input is used to sense whether the handset is on-hook or off-hook. In on-hook state, HKS = 1: chip is in sleeping mode, no operation. In off-hook state, HKS = 0: chip is enabled for normal operation. HKS pin is pulled to VDD by internal resistor. KT
(W91F840N/F8 40AN/F842N/F 842AN/F841AN /F843AN only)
XT
10 11
10 11
11 12
O O
T/P MUTE
MODE
15
17
20
I
6
6
7
O
The key tone output is a conventional CMOS inverter. The key tone is generated when any valid key is pressed; the KT pin generates a 1.2 KHz square wave at 35 mS. When no key is pressed, the KT pin remains in low state.
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
Pin Description, continued
SYMBOL LOCK
(W91F840LN/ F840ALN/ F841ALN only)
22-PIN 6
24-PIN 6
28-PIN 7
I/O I
FUNCTION The function of this terminal is to prevent "0" dialing and "9" dialing under PABX system long distance call control. When the first key input after reset is 0 or 9, all key inputs, including the 0 or 9 key, become invalid and the chip generates no output. The telephone is reinitialized by a reset. The function of the LOCK pin is shown below:
LOCK PIN VDD Floating VSS FUNCTION "0", "9" dialing inhibited Normal dialing Mode "0" dialing inhibited
H/P MUTE
7
7
8
I
The H/P MUTE is a conventional inverter output. During pulse dialing, flash break or hold period, this output is active high; otherwise, it remains in low state. 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).
DP
13
15
18
O
DTMF
14
16
19
O
During pulse dialing, this pin remains in a low state regardless of the keypad input. In tone mode, it will output a dual or single tone. A detailed timing diagram for tone mode is shown in Figure 2(a, b).
OUTPUT FREQUENCY Specified R1 R2 R3 R4 C1 C2 C3 697 770 852 941 1209 1336 1477 Actual 699 766 848 948 1216 1332 1472 Error % +0.28 -0.52 -0.47 +0.74 +0.57 -0.30 -0.34
VDD, VSS
16, 8
18, 8
21, 9
I
Power input pins for the dialer chip. VDD is the power and VSS is the ground.
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W91F840N SERIES
Pin Description, continued
SYMBOL V1, V2
22-PIN -
24-PIN -
28-PIN 14, 15
I/O O
FUNCTION Volume control output pins. These two pins can be toggled by the volume control keys (Vup, Vdown). These two pins output is a conventional CMOS Nchannel open drain output. A low pulse on the HFI input pin toggles the handfree control state. The status of the handfree control state is listed in the following table:
CURRENT STATE
HOOK SW. HFO INPUT
HFI , HFO
-
12, 13
13, 16
I, O Handfree control pins.
NEXT STATE
HFO DIALING
On Hook Off Hook On Hook Off Hook Off Hook
Low High High Low High
HFI HFI HFI Off Hook On Hook On Hook
High Low Low Low Low High
Yes No Yes Yes No Yes
The HFI pin is pulled to VDD by an internal resistor. A detailed timing diagram is shown in Figure 3.
BLOCK DIAGRAM
XT XT
HKS HFI SYSTEM CLOCK GENERATOR
ROW (R1 ~ R7) KEYBOARD INTERFACE COLUMN (C1 ~ C6) LOCATION LATCH
READ/WRITE COUNTER
CONTROL LOGIC
LOCK MODE
T/P MUTE KT RAM PULSE CONTROL LOGIC DP HFO H/P MUTE K MUTE V1 V2
DTMF
D/A CONVERTER
ROW & COLUMN PROGRAMMABLE COUNTER
DATA LATCH & DECODER
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
FUNCTIONAL DESCRIPTION
Keyboard Operation
C1 1 4 7 */T F1 M5 C1 1 4 7 */T F1 M5 M15 C2 2 5 8 0 F2 M6 C2 2 5 8 0 F2 M6 M16 C3 3 6 9 # S2 M7 C3 3 6 9 # S2 M7 M17 C4 S1 F4 Page R/P H M8 C4 S1 F4 Page R/P H M8 M18 C5
M0 M1 M2 M3 M4 M9
VSS
EM1 EM2 EM3 SAVE MUTE R1 R2 R3 R4 Vx/R5 R6
C5 M0 M1 M2 M3 M4 M9 M19
C6 M10 M11 M12 M13 M14 R Vup
VSS EM1 EM2 EM3 SAVE
MUTE Vdown
R1 R2 R3 R4 Vx/R5 R6 R7
* S1,S2: Store function key * Page: Indirect repertory memory dialing function key * H: Hold function key * R: One key redial function key * R/P: Redial and pause function key * */T: * in tone mode and PT key in pulse mode * SAVE: Save function key for one-touch 32-digit memory * MUTE: Mute function key for speech mute * M0-M9: One touch memory. The dialing number can be stored in M0-M9 locations by the S key.
Note that the two touch memory (Page+ 0... Page+9) share the same memory buffer with M10-M19, respectively
* M10, ..., M19: One touch or two touch memory keys. If there are no M10-M19 keys,push the key
Page + (Mm = M0-M9) can be used to simulate M10-M19.
* EM1, ..., EM3: Emergency one-touch memory key * Page: Indiect repertory dialing function key * F1, ..., F4: Flash function keys: F1 = 600 mS, F2 = 300 mS, F4 = 100 mS; all flash pause time is 1.0
S
Note: D1, ..., Dn, D1, ..., Dn, */T, #, Mm: M0, ..., M9, Mn: M0, ..., M19, Ln: 0-9 PAGE + LN = PAGE + Mm = M10-M19
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W91F840N SERIES
Normal Dialing
OFF HOOK (or ON HOOK &
HFI
),
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.
Redialing Dialing
1. OFF HOOK (or , ON HOOK OFF HOOK & (or
HFI
,
D1 &
,
D2 HFI
, ..., ),
Dn R/P
, BUSY
Come The
ON HOOK
ON HOOK
R/P key can execute redial function only as first key-in after off-hook. Otherwise, it will invoke
the pause function. 2. OFF HOOK (or ON HOOK &
HFI
),
D1
,
D2
, ...,
Dn
,
R
a. The one-key redial function timing diagram is shown in Figure 5. b. If dialing of D1 to Dn is finished, pressing D1
HFI
R
key will cause the pulse output pin to R will be ignored. , Busy ON HOOK
go low for 2.2 seconds break time and a 600ms pause will automatically be added. c. If the pulses of the dialed number 3. OFF HOOK come, If (or ON HOOK , OKR & (or to Dn ), ) D1 have not finished, , D2 , ...,
Dn
OFF HOOK
R/P
R is the first key after OFF HOOK, it only can execute the redialing function but will not cause
the pulse output pin to go low for the break time of 2.2 seconds.
Number Store
1. OFF HOOK Mn (or page (or Ln ON HOOK or EMp & or HFI SAVE ) ), D1 , D2 , ..., Dn , S1 , S1 ,
Note: Mn: M0, ..., M19; Mm: M0, ..., M9; Emp: EM1, ..., EM3; Mo: M10-M19
or OFF HOOK Emp or Mo or (or ON HOOK or & HFI , Ln ), ) D1 , D2 , ..., Dn , S2 , S2 ,
SAVE
PAGE
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
a. The dialing out of D1 to Dn must first be finished before the S1 or S2 key is pressed.
b. D1, D2, ..., Dn will be stored in memory location Mn or saved and then dialed out. c. D1, D2, ..., Dn will be stored in memory location Mo or saved and then dialed out. 2. OFF HOOK Mn or OFF HOOK Mo or (or ON HOOK or SAVE & or HFI PAGE ), , S2 Ln , ) D1 , D2 , ..., Dn , S2 , (or Ln ON HOOK or EMp & or HFI WR ), SAVE ) S1 , D1 , D2 , ..., Dn , S1 ,
(or PAGE
EMp
D1, D2, ..., Dn will be stored in memory location, Mn (S1), (Mo (S2), or saved), but will not be dialed out. 3. a. R/P and */T keys can be stored as a digit in memory, but the R/P is the pause function key. R/P key cannot be the
first digit. In store mode,
b. The store mode is released after the store function is executed or when the state of the hook switch changes or the flash function is executed.
Notes a. S1: store 1 key can access the memory 0 to 19. b. S2: store 2 key can access the memory 10 to 19. c. Save, EM1 ~ EM3 can be accessed by S1 and S2 key.
Save
OFF HOOK (or ON HOOK & HFI ), D1 , D2 , ..., Dn , SAVE
a. D1, D2, ..., Dn will be dialed out. b. If the dialing of memory. OFF HOOK come on (or ON HOOK (or & HFI & ), HFI ), SAVE D1 to Dn is finished, pressing SAVE will duplicate D1 to Dn to the save
OFF HOOK
ON HOOK
c. D1 to Dn will be dialed out after the
SAVE
key is pressed.
Repertory Dialing Procedure
One-touch direct repertory dialing: OFF HOOK (or ON HOOK &
HFI
),
Mn
(or
EMn
or
SAVE
)
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W91F840N SERIES
Two-touch direct repertory dialing: OFF HOOK (or ON HOOK &
HFI
),
Page
,
Ln
(or
Mn
)
Access Pause
OFF HOOK (or ON HOOK & HFI ), D1 , D2 , R/P , D3 , ..., Dn
1. The pause function can be stored in memory. 2. The pause function is executed with normal dialing, redialing or memory dialing. 3. The pause function timing diagram is shown in Figure 6.
Pulse-to-tone (*/T)
OFF HOOK , D2' , ..., (or Dn' ON HOOK & HFI ), D1 , D2 , ..., Dn , */T , D1' ,
1. If the mode switch is set in pulse mode, then it will perform D1, D2, ---, Dn, Pause, (3.6 sec), D1', D2', ---, Dn' (Pulse) (Tone) 2. If the mode switch is set in tone mode, then the output signal will be: D1, D2, ---, Dn, * , D1', D2', ---, Dn' (Tone) (Tone) 3. It can be reset to pulse mode only if ON HOOK is active. This is because it remains in tone mode when the digits have been dialed out. 4. The function timing diagram is shown in Figure 7.
Flash
OFF HOOK (or ON HOOK & HFI ), Fn
1. Fn = F1, F2, F4. If Fn is pressed, the dialer will execute a flash break time of 600 mS (F1), 300 (F2), 100 mS (F4) and a pause time of 1.0 second before the next digit is dialed out. 2. The flash key has the first priority of the keyboard function only one flash key will be released to the user. 3. When the flash key is key in, the system will return to the initial state after the flash pause time is finished. 4. The flash function timing diagram is shown in Figure 8.
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
Cascaded Dialing
OFF HOOK 1. (or ON HOOK + & HFI ) + Normal Dialing
Normal Dialing (1st sequence)
Repertory Dialing (2nd sequence) + Normal Dialing (2nd sequence)
2.
Repertory Dialing (1st sequence)
+
Repertory Dialing
3.
Redialing
+
Normal Dialing
+
Repertory Dialing
(1st sequence)
(2nd sequence)
Redialing is valid only for the first key-in. The second sequence should not be operated until the first sequence is dialed out completely.
Mute
OFF HOOK , MUTE
MUTE has an on/off toggle function.
ABSOLUTE MAXIMUM RATING
PARAMETER DC Supply Voltage Input/Output Voltage SYMBOL VDD-VSS VIL VIH VOL VOH Power Dissipation Operation Temperature Storage Temperature PD TOPR TSTG RATING -0.3 to +7.0 VSS -0.3 VDD +0.3 VSS -0.3 VDD +0.3 120 -20 to +70 -55 to +150 UNIT V V V V V mW C C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device.
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W91F840N SERIES
DC CHARACTERISTICS
(VDD-VSS = 2.5V, Fosc. = 3.58 MHz, TA = 25 C, all outputs unloaded)
PARAMETER Operating Voltage Operating Current Standby Current Memory Retention Current Tone Output Voltage Pre-emphasis DTMF Distortion DTMF Output DC Level DTMF Output Sink Current DP Output Sink Current T/P MUTE Output Sink Current KT Drive/Sink Current HFO Drive/Sink Current
SYM. VDD IOP ISB IMR VTO Tone Pulse
CONDITIONS -
MIN. 2.4 130 1 1.0 0.2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 4 300
TYP. 0.4 0.2 150 2 -30 500 400 -
MAX. 5.5 0.6 0.4 15 1 170 3 -23 3.0 5.0
UNIT V mA mA A A
mVrms
HKS = 0, No load & No key entry
HKS = 1, VDD = 1.0V
Row group, RL = 5 K Col/Row, VDD = 2.0-5.5V
dB dB V mA mA mA mA mA mA mA mA mA mA A K A K
THD VTDC ITL IPL IML IKTH IKTL IHFH IHFL IKML IHPH IHPL IKD RHKS IKS
RL = 5 K, VDD = 2.0-5.5V RL = 5 K, VDD = 2.0-5.5V VTO = 0.5V VPO = 0.5V VMO = 0.5V VKTH = 2.0V VKTL = 0.5V VHFH = 2.0V VHFL = 0.5V VKML = 0.5V VHPH = 2.0V VHPL = 0.5V VI = 0V
K MUTE Sink Current H/P MUTE Drive/Sink Current Keypad Input Drive Current HKS Pull High Resister Keypad Input Sink Current Keypad Resistance
VI = 2.5V
200 -
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
AC CHARACTERISTICS
PARAMETER Key-in Debounce Key Release Debounce On-hook Debounce Pre-digit Pre-digit Pause1 Pause2 SYM. TKID TKRD TOHD TPDP1 10 ppS TPDP2 20 ppS Inter Digit Pause (Auto Dialing) TIDP Lock Mode Unlock Mode Mode Pin = VDD Mode Pin = Floating Mode Pin = VDD Mode Pin = Floating 10 ppS
(Unless 91F840N/W91F840AN/ 840LN/F840ALN/F841AN/ F841ALN only)
CONDITIONS -
MIN. -
TYP. 20 20 20 150 40 33.3 20 16.7 800
MAX. -
UNIT mS mS mS mS mS mS mS mS mS
20 ppS
(W91F842N/F842AN/F843AN only)
-
500
-
mS
Interdigit Pause (Auto dialing) Make/Break Ratio Tone Output Duration Intertone Pause Flash Break Time
TIDP M:B TTD TITP TFB
10 ppS 20 ppS Mode Pin = VDD Mode Pin = Floating
F1 F2 F4 -
800 500 40:60 33.3:66.7 93 93 600 300 100 1.0 3.6 1.2 35 600 2.2 300
-
mS mS % % mS mS mS
Flash Pause Time Pause Time Key Tone Frequency Key Tone Duration One-key Redialing Pause Time One-key Redialing Break Time First Key-in Delay
TFP TP FKT TKTD TRP TRB TFKD Lock only
-
S S KHz mS mS S mS
Notes: 1. Crystal parameters suggested for proper operation are Rs < 100 , 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.
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W91F840N SERIES
VOLUME CONTROL FLOW CHART
Volume initial data: V1 = 0, V2 = 0 On line In handfree mode In handset mode Volume set Vol-set1: V1 = 0, V2 = 0 In hold mode Volume data can't be changed , and will out handfree data In hold mode In handset mode Vol-set2: V1 = 0, V2 = 0
Yes Off-hook ? No
No Hold release by handfree ? Yes Volume set In handfree mode
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
Volume Control Flow Chart, continied
Volume initial data: V1 = 0, V2 = 0
No Chip Enable ? Yes No No Press Vup or Vdown keys
Hand-free ? Yes
In handset mode
Volume setting OK ? Yes Yes No Press hand-free key ?
In hand-free mode
Press Vup or Vdown keys
No Volume setting OK ? Yes
Yes
Switch to handset ?
No
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W91F840N SERIES
TIMING WAVEFORMS
HKS 4 TKID DP
B M
KEY IN
2
2 TKID
TIDP TPDP
M
B
TIDP TPDP
TIDP
T/P MUTE
H/ P MUTE KT DTMF LOW
OSC.
OSC.
OSC.
Figure 1(a) Pulse Mode Tming Diagram (Normal dialing without lock function)
HKS
300 mS
KEY IN
TFKD
4 TKID
M
2
2 TKID
DP
B
TIDP TPDP
M
B
TIDP TPDP
TIDP
T/P MUTE
H/ P MUTE
DTMF
LOW
OSC.
OSC.
OSC.
Figure 1(b) Pulse Mode Timing Diagram (Normal dialing with lock function)
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
Timing Waveforms, continued
HKS KEY IN DP R/P
M B
TIDP TPDP
MB
TIDP TPDP
TIDP
T/P MUTE
H/P MUTE
KT DTMF OSC.
ON HOOK
LOW
OSC.
Figure 1(c) Pulse Mode Timing Diagram (Auto dialing without lock)
HKS KEY IN
300 mS
TFKD
R/P
M
DP
B
TIDP TPDP
MB
TIDP TPDP
TIDP
T/P MUTE
H/P MUTE
DTMF OSC.
ON HOOK
LOW
OSC.
Figure 1(d) Pulse Mode Timing Diagram (Auto dialing with lock function)
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W91F840N SERIES
Timing Waveforms, continued
HKS 3 TKID DTMF T/P MUTE LOW TTD 2 TKRD 6 TKRD 5 TKRD
KEY IN
TKID
TITP
TITP
TITP
H/P MUTE KT DTMF
HIGH OSC. OSC.
OSC.
Figure 2(a) Tone Mode Timing Diagram (Normal dialing without lock)
HKS
300 mS
TFKD 3 TKID 2 TKRD 6 TKRD 5 TKRD
KEY IN
TKID
DTMF T/P MUTE
TTD
TITP
TITP
TITP
H/P MUTE
LOW
DTMF
HIGH OSC. OSC.
OSC.
Figure 2(b) Tone Mode Timing Diagram (Normal dialing with lock function)
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
Timing Waveforms, continued
HKS T KEY IN R/P TKID DTMF T/P MUTE LOW TTD T < TOHD
TITP
TITP
H/P MUTE KT DP
HIGH OSC.
ON HOOK
OSC.
Figure 2(c) Tone Mode Timing Diagram (Auto dialing without lock)
HKS T KEY IN R/P TKID DTMF T/P MUTE LOW TTD TITP T < TOHD
TITP
H/P MUTE
DP
HIGH OSC. TFKD Figure 2(d) Tone Mode Timing Diagram (Auto dialing with lock function)
OSC.
- 18 -
W91F840N SERIES
Timing Waveforms, continued
HKS T KEY IN R/P TKID DTMF T/P MUTE (return to initial state) H/P MUTE KT DP HIGH OSC.
ON HOOK
T > TOHD
TTD
TITP
LOW
OSC.
Figure 2(e) Tone Mode Timing Diagram with On-hook Debounce (Auto dialing)
HKS
OFF HOOK
ON HOOK
HFI
H KEY
HFO T/P MUTE HIGH LOW
H/P MUTE
CHIP ENABLE
Note: The H KEY can not be enabled during chip dissable.
Figure 3(a)
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
Timing Waveforms, continued
HKS HFI
OFF HOOK
H KEY
HFO T/P MUTE HIGH
H/P MUTE
CHIP ENABLE
Figure 3(b) Note: The H KEY and HFI inputs will toggle the HFO signal. The first time HFI or H KEY are activated, the HFO signal will go high and the previous active input will be neglected.
ON HOOK HKS HFI
H KEY
HFO T/P MUTE HIGH
H/P MUTE CHIP ENABLE
Figure 3(c) Note: The HKS signal change of state from high to low will initialize both the HFO and H/P MUTE signals.
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W91F840N SERIES
Timing Waveforms, continued
HKS
T TKEY IN DP T/P MUTE
4 TKID
B
M TIDP TPDP
TFKD
300 mS
TOFD
H/P MUTE
DTMF OSC. CHIP ENABLE
ON HOOK
LOW OSC. OSC.
TOHD
Figure 4 Lock Function Timing Diagram
HKS KEY IN OKR
LOW
M
DP TKID T/P MUTE
TRB
TRP
B
TIDP TPDP TPDP
TIDP
H/P MUTE
KT DTMF OSC. LOW
OSC.
Figure 5 Pulse Mode One-key Dedialing Timing Diagram
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Publication Release Date: July 1999 Revision A2
W91F840N SERIES
Timing Waveforms, continued
HKS 4 TKID 2
M
KEY IN DP T/P MUTE
R/P
2
B
TIDP TPDP
MB
TIDP TPDP TP
TIDP
H/P MUTE KT DTMF OSC.
LOW
OSC.
Figure 6 Pause Function Timing Diagram (without LOCK function)
HKS 4 TKID DP
B
KEY IN
2
M
*/T
8
TPDP T/P MUTE
TIDP
MB
TIDP
TP DTMF TITP H/P MUTE
KT OSC.
OSC.
Figure 7. Pulse to Tone Function Timing Diagram(without LOCK function)
- 22 -
W91F840N SERIES
Timing Waveforms, continued
HKS KEY IN TKID DP TFB Fn
LOW
T/P MUTE
H/P MUTE
KT DTMF OSC. LOW TFP OSC.
Figure 8 Flash Operation Timing Diagram
Headquarters
Winbond Electronics (H.K.) Ltd.
Rm. 803, World Trade Square, Tower II, No. 4, Creation Rd. III, 123 Hoi Bun Rd., Kwun Tong, Science-Based Industrial Park, Kowloon, Hong Kong Hsinchu, Taiwan TEL: 852-27513100 TEL: 886-3-5770066 FAX: 852-27552064 FAX: 886-3-5792766 http://www.winbond.com.tw/ Voice & Fax-on-demand: 886-2-27197006
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
Taipei Office
11F, No. 115, Sec. 3, Min-Sheng East Rd., Taipei, Taiwan TEL: 886-2-27190505 FAX: 886-2-27197502
Note: All data and specifications are subject to change without notice.
- 23 -
Publication Release Date: July 1999 Revision A2

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