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 × 6 or 7 × 7 keyboard Easy operation with redial, flash, pause, and */T keypads Pause, P→T (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 W91F843AN 20 FLASH-MEMORY LOCK KEY TONE 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 - √ HANDFREE DIALING - √ √ √ √ - - √ √ - √ √ √ - √ √ √ - PACKAGE (PINS) 22 24 22 24 28 28 22 24 - √ √ √ 28 -1- - - VOLUME CONTROL √ √ Publication Release Date: July 1999 Revision A2 W91F840N SERIES PIN CONFIGURATIONS C1 1 C2 C3 C1 1 C2 2 24 R6 23 R4 22 R6 2 21 R4 C3 3 22 R3 3 20 R3 C4 4 21 R2 C4 4 19 R2 C5 5 20 R1 C5 5 18 R1 KT 6 19 K MUTE KT 6 17 K MUTE H/P MUTE 7 18 V DD H/P MUTE 7 16 V DD VSS 8 17 MODE 8 15 MODE XT 9 16 DTMF 9 14 DTMF XT 10 15 T/P MUTE 11 14 HKS HFI 12 13 HFO VSS XT XT T/P MUTE 10 13 DP 11 12 HKS C1 1 C1 1 22 R6 C2 2 C2 2 21 R4 C3 C3 3 20 R3 C4 4 19 C5 5 18 R6 R4 3 22 R3 C4 4 21 R2 R2 C5 5 20 R1 R1 LOCK 6 H/P MUTE K MUTE 7 18 VDD 8 17 MODE MODE XT 9 16 DTMF DTMF XT 10 15 DP 11 14 HKS 12 13 17 K MUTE 7 16 VDD VSS 8 15 XT 9 14 10 13 W91F840LN 19 VSS 6 12 R7 27 R6 C3 3 26 R4 C4 4 25 R3 C5 5 24 R2 C6 6 23 R1 KT 7 22 K MUTE H/P MUTE 8 21 VDD VSS 9 20 MODE DTMF XT 10 19 XT 11 18 DP T/P MUTE 12 17 HKS HFI V1 13 16 HFO 14 15 V2 W91F841AN/F843AN 23 LOCK 11 28 DP 24 H/P MUTE XT 1 2 W91F840AN/F842AN W91F840N/F842N T/P MUTE C1 C2 DP HKS T/P MUTE HFI W91F840ALN -2- HFO C1 1 28 R7 C2 2 27 R6 C3 3 26 R4 C4 4 25 R3 C5 5 24 R2 C6 6 23 R1 LOCK 7 22 K MUTE H/P MUTE 8 21 VDD VSS 9 20 MODE XT 10 19 DTMF XT 11 18 DP T/P MUTE 12 17 HKS HFI 13 16 HFO V1 14 15 V2 W91F841ALN W91F840N SERIES PIN DESCRIPTION SYMBOL 22-PIN 24-PIN 28-PIN I/O FUNCTION ColumnRow Inputs 1−5 & 18−22 1−5 & 20−24 1−6 & 23−28 I The keyboard input is compatible with a standard 6 × 6 or 7 × 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%. XT 10 10 11 O Crystal oscillator output pin. T/P MUTE 11 11 12 O 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 MODE 17 15 19 17 22 20 O I 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) 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. -3- Publication Release Date: July 1999 Revision A2 W91F840N SERIES Pin Description, continued SYMBOL LOCK 22-PIN 24-PIN 28-PIN I/O FUNCTION 6 6 7 I 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. (W91F840LN/ F840ALN/ F841ALN only) The function of the LOCK pin is shown below: FUNCTION LOCK PIN VDD Floating VSS "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. DP 13 15 18 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). 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 VDD, VSS 16, 8 18, 8 21, 9 I Specified Actual R1 697 699 +0.28 R2 770 766 -0.52 R3 852 848 -0.47 R4 941 948 +0.74 C1 1209 1216 +0.57 C2 1336 1332 -0.30 C3 1477 1472 -0.34 Error % Power input pins for the dialer chip. VDD is the power and VSS is the ground. -4- W91F840N SERIES Pin Description, continued SYMBOL 22-PIN 24-PIN 28-PIN I/O V1, V2 - - 14, 15 O HFI , HFO - 12, 13 13, 16 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. I, O Handfree control pins. 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 NEXT STATE INPUT HFO DIALING - Low HFI High On Hook High HFI Low No Off Hook High HFI Low Yes On Hook - Off Hook Low Yes Off Hook Low On Hook Low No Off Hook High On Hook High Yes 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 ROW (R1 ~ R7) SYSTEM CLOCK GENERATOR READ/WRITE COUNTER CONTROL LOGIC LOCK MODE KEYBOARD INTERFACE T/P MUTE KT COLUMN (C1 ~ C6) PULSE CONTROL LOGIC RAM LOCATION LATCH DP HFO H/P MUTE K MUTE V1 V2 DTMF D/A CONVERTER ROW & COLUMN PROGRAMMABLE COUNTER -5- DATA LATCH & DECODER Publication Release Date: July 1999 Revision A2 W91F840N SERIES FUNCTIONAL DESCRIPTION Keyboard Operation C1 1 4 7 */T F1 M5 C2 2 5 8 0 F2 M6 C3 3 6 9 # S2 M7 C4 S1 F4 Page R/P H M8 C5 VSS M0 M1 M2 M3 M4 M9 EM1 EM2 EM3 SAVE MUTE C1 1 4 7 */T F1 M5 M15 C2 2 5 8 0 F2 M6 M16 C3 3 6 9 # S2 M7 M17 C4 S1 F4 Page R/P H M8 M18 C5 M0 M1 M2 M3 M4 M9 M19 C6 M10 M11 M12 M13 M14 R Vup R1 R2 R3 R4 Vx/R5 R6 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 P→T 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 -6- 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 Come The (or ON HOOK ON HOOK , & OFF HOOK , HFI (or D1 ON HOOK , & , …, D2 Dn ), HFI , BUSY R/P 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 R key will cause the pulse output pin to 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 OFF HOOK , OKR & D1 to ), HFI (or Dn R/P have not finished, D1 , D2 , ..., R will be ignored. Dn , Busy ON HOOK ) 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 ON HOOK Ln or EMp ), & HFI or SAVE D1 , D2 , ..., Dn , S1 , S1 , , D2 , ..., Dn , S2 , S2 , ) Note: Mn: M0, ..., M19; Mm: M0, ..., M9; Emp: EM1, ..., EM3; Mo: M10−M19 or OFF HOOK Emp or Mo or (or ON HOOK SAVE or & PAGE ), HFI , Ln D1 ) -7- 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 (or PAGE ON HOOK Ln or HFI WR ), & EMp or SAVE S1 , D1 , D2 , ..., Dn , S1 , ) or OFF HOOK Mo or (or EMp ON HOOK or & SAVE HFI or PAGE ), S2 , Ln , D1 , D2 , ..., Dn , S2 , ) 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 first digit. In store mode, R/P R/P key cannot be the is the pause function key. 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 D1 to Dn is finished, pressing SAVE will duplicate D1 to Dn to the save memory. OFF HOOK come on (or ON HOOK OFF HOOK (or & ), HFI ON HOOK c. D1 to Dn will be dialed out after the & HFI SAVE ), SAVE key is pressed. Repertory Dialing Procedure One-touch direct repertory dialing: OFF HOOK (or ON HOOK & HFI ), -8- Mn (or EMn or SAVE ) W91F840N SERIES Two-touch direct repertory dialing: OFF HOOK (or ON HOOK & HFI ), Page ON HOOK & HFI ), D1 , Ln (or Mn ) , D3 Access Pause OFF HOOK (or , D2 , R/P , ..., 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 (or , Dn' D2' , ..., 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. -9- Publication Release Date: July 1999 Revision A2 W91F840N SERIES Cascaded Dialing OFF HOOK 1. (or ON HOOK Normal Dialing + Repertory Dialing Redialing + Normal Dialing + Repertory Dialing (2nd sequence) + (1st sequence) 3. ) HFI Repertory Dialing (1st sequence) 2. & Normal Dialing (2nd sequence) + Normal Dialing (1st sequence) + Repertory Dialing (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 Power Dissipation SYMBOL RATING UNIT VDD-VSS -0.3 to +7.0 V VIL VSS -0.3 V VIH VDD +0.3 V VOL VSS -0.3 V VOH VDD +0.3 V PD 120 mW Operation Temperature TOPR -20 to +70 °C Storage Temperature TSTG -55 to +150 °C Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device. - 10 - W91F840N SERIES DC CHARACTERISTICS (VDD−VSS = 2.5V, Fosc. = 3.58 MHz, TA = 25° C, all outputs unloaded) PARAMETER SYM. CONDITIONS MIN. TYP. MAX. UNIT Operating Voltage VDD - 2.4 - 5.5 V Operating Current IOP Tone - 0.4 0.6 mA Pulse - 0.2 0.4 mA Standby Current ISB HKS = 0, No load & No key entry - - 15 µA Memory Retention Current IMR HKS = 1, VDD = 1.0V - - 1 µA Tone Output Voltage VTO Row group, RL = 5 KΩ 130 150 170 mVrms Col/Row, VDD = 2.0−5.5V 1 2 3 dB Pre-emphasis DTMF Distortion THD RL = 5 KΩ, VDD = 2.0−5.5V - -30 -23 dB DTMF Output DC Level VTDC RL = 5 KΩ, VDD = 2.0−5.5V 1.0 - 3.0 V DTMF Output Sink Current ITL VTO = 0.5V 0.2 - - mA DP Output Sink Current IPL VPO = 0.5V 0.5 - - mA T/P MUTE Output Sink Current IML VMO = 0.5V 0.5 - - mA KT Drive/Sink Current IKTH VKTH = 2.0V 0.5 - - mA IKTL VKTL = 0.5V 0.5 - - mA IHFH VHFH = 2.0V 0.5 - - mA IHFL VHFL = 0.5V 0.5 - - mA K MUTE Sink Current IKML VKML = 0.5V 0.5 - - mA H/P MUTE IHPH VHPH = 2.0V 0.5 - - mA Drive/Sink Current IHPL VHPL = 0.5V 0.5 - - mA Keypad Input Drive Current IKD VI = 0V 4 - - µA 300 500 - KΩ 200 400 - µA - - 5.0 KΩ HFO Drive/Sink Current HKS Pull High Resister Keypad Input Sink Current RHKS IKS VI = 2.5V Keypad Resistance - 11 - Publication Release Date: July 1999 Revision A2 W91F840N SERIES AC CHARACTERISTICS PARAMETER SYM. CONDITIONS MIN. TYP. MAX. UNIT Key-in Debounce TKID - - 20 - mS Key Release Debounce TKRD - - 20 - mS On-hook Debounce TOHD Pre-digit Pause1 Pre-digit Pause2 Lock Mode - 20 - mS Unlock Mode - 150 - mS Mode Pin = VDD - 40 - mS 10 ppS Mode Pin = Floating - 33.3 - mS TPDP2 Mode Pin = VDD - 20 - mS Mode Pin = Floating - 16.7 - mS 10 ppS - 800 - mS - 500 - mS - 800 - mS TPDP1 20 ppS Inter Digit Pause (Auto Dialing) TIDP (Unless 91F840N/W91F840AN/ 840LN/F840ALN/F841AN/ F841ALN only) 20 ppS (W91F842N/F842AN/F843AN only) Interdigit Pause TIDP 10 ppS 20 ppS - 500 - mS Make/Break Ratio M:B Mode Pin = VDD - 40:60 - % Mode Pin = Floating - 33.3:66.7 - % Tone Output Duration TTD - 93 - mS Intertone Pause TITP - 93 - mS Flash Break Time TFB F1 - 600 - mS F2 - 300 - F4 - 100 - - - 1.0 - (Auto dialing) Flash Pause Time TFP S Pause Time TP - - 3.6 - S Key Tone Frequency FKT - - 1.2 - KHz Key Tone Duration TKTD - - 35 - mS One-key Redialing Pause Time TRP - - 600 - mS One-key Redialing Break Time TRB - - 2.2 - S First Key-in Delay TFKD - 300 - mS Lock only 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. - 12 - W91F840N SERIES VOLUME CONTROL FLOW CHART Volume initial data: V1 = 0, V2 = 0 On line In handfree mode Yes Off-hook ? In handset mode No Volume set Vol-set1: V1 = 0, V2 = 0 In hold mode No Hold release by handfree ? Yes Volume set Volume data can't be changed , and will out handfree data In hold mode In handset mode Vol-set2: V1 = 0, V2 = 0 In handfree mode - 13 - 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 Hand-free ? No Press Vup or Vdown keys In handset mode Volume setting OK ? Yes Yes Yes In hand-free mode Press Vup or Vdown keys No Yes Volume setting OK ? Yes No Switch to handset ? - 14 - No Press hand-free key ? W91F840N SERIES TIMING WAVEFORMS HKS 4 KEY IN 2 TKID DP 2 TKID M B TIDP M B TIDP TIDP TPDP TPDP 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 2 TKID DP B 2 TKID M TIDP M TPDP B TIDP TIDP TPDP T/P MUTE H/ P MUTE DTMF LOW OSC. OSC. OSC. Figure 1(b) Pulse Mode Timing Diagram (Normal dialing with lock function) - 15 - Publication Release Date: July 1999 Revision A2 W91F840N SERIES Timing Waveforms, continued HKS R/P KEY IN M DP B TIDP M B TIDP TIDP TPDP TPDP T/P MUTE H/P MUTE KT LOW DTMF OSC. OSC. ON HOOK Figure 1(c) Pulse Mode Timing Diagram (Auto dialing without lock) HKS KEY IN 300 mS TFKD R/P M DP B TIDP M B TPDP TIDP TIDP TPDP T/P MUTE H/P MUTE LOW DTMF OSC. OSC. ON HOOK Figure 1(d) Pulse Mode Timing Diagram (Auto dialing with lock function) - 16 - W91F840N SERIES Timing Waveforms, continued HKS 3 KEY IN 2 TKID DTMF 6 TKRD TKRD TTD TITP TKID 5 TKRD TITP TITP T/P MUTE LOW H/P MUTE KT DTMF HIGH OSC. OSC. OSC. Figure 2(a) Tone Mode Timing Diagram (Normal dialing without lock) HKS KEY IN 300 mS TFKD 3 2 TKID DTMF TTD 6 TKRD TKRD TITP TKID 5 TKRD TITP TITP T/P MUTE H/P MUTE DTMF OSC. LOW HIGH OSC. OSC. Figure 2(b) Tone Mode Timing Diagram (Normal dialing with lock function) - 17 - Publication Release Date: July 1999 Revision A2 W91F840N SERIES Timing Waveforms, continued HKS T T < TOHD R/P KEY IN TKID DTMF TTD TITP TITP T/P MUTE LOW H/P MUTE KT DP HIGH OSC. OSC. ON HOOK Figure 2(c) Tone Mode Timing Diagram (Auto dialing without lock) HKS T T < TOHD R/P KEY IN TKID DTMF TTD TITP TITP T/P MUTE LOW H/P MUTE DP HIGH OSC. OSC. TFKD Figure 2(d) Tone Mode Timing Diagram (Auto dialing with lock function) - 18 - W91F840N SERIES Timing Waveforms, continued HKS T T > TOHD R/P KEY IN TKID DTMF TTD TITP T/P MUTE (return to initial state) LOW H/P MUTE KT DP HIGH OSC. OSC. ON HOOK 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 H/P MUTE LOW CHIP ENABLE Note: The H KEY can not be enabled during chip dissable. Figure 3(a) - 19 - Publication Release Date: July 1999 Revision A2 W91F840N SERIES Timing Waveforms, continued OFF HOOK HKS HFI 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 HIGH T/P MUTE 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. - 20 - W91F840N SERIES Timing Waveforms, continued HKS T T<TOHD 4 KEY IN TKID M B DP TIDP TPDP T/P MUTE TOFD TFKD 300 mS H/P MUTE TOHD LOW DTMF OSC. OSC. OSC. CHIP ENABLE ON HOOK Figure 4 Lock Function Timing Diagram LOW HKS KEY IN OKR M TRB DP B TRP TKID TIDP TPDP TIDP TPDP T/P MUTE H/P MUTE KT DTMF LOW OSC. OSC. Figure 5 Pulse Mode One-key Dedialing Timing Diagram - 21 - Publication Release Date: July 1999 Revision A2 W91F840N SERIES Timing Waveforms, continued HKS 4 KEY IN 2 TKID DP R/P 2 M B TIDP M B TIDP TIDP TPDP TPDP T/P MUTE TP H/P MUTE KT DTMF LOW OSC. OSC. Figure 6 Pause Function Timing Diagram (without LOCK function) HKS KEY IN 4 2 TKID DP B TPDP */T 8 M TIDP M B TIDP T/P MUTE 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 LOW HKS Fn KEY IN TKID TFB DP T/P MUTE H/P MUTE KT LOW DTMF TFP OSC. 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