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w91472n series 6-memory tone/pulse dialer with save and handfree functions publication release date: may 1997 - 1 - revision a2 general description the w91472n series are tone/pulse switchable telephone dialers with five memories, save memory, and handfree dialing control. these chips are fabricated using winbond's high-performance cmos technology and thus offer good performance in low-voltage and low-power operations. features dtmf/pulse switchable dialer two by 32 digit redial and save memory five by 16 digit one-touch direct repertory memory pulse-to-tone (*/t) keypad for long distance call operation cascaded dialing uses 5 6 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 pps or 20 pps) selectable by bonding option on-hook debounce time: 150 ms minimum tone output duration: 93 ms minimum intertone pause: 93 ms pause time: 3.6 sec. flash break time (73 ms, 100 ms, 300 ms, or 600 ms) selectable by keypad; pause time is 1.0s make/break ratio (40:60 or 33.3:66.7) selectable by mode pin on-chip power-on reset uses 3.579545 mhz crystal or ceramic resonator 18 or 20-pin dual-in-line plastic package the different dialers in the w91472n series are shown in the following table: type no. replacement type no. pulse ( pp s) flash ( m s) m/b key tone handfree dialing package (pins) w91472n w91472 10 600/300/73/100 pin - - 18 w91472an w91472a 10 600/300/73/100 pin yes yes 20 W91472BN w91472b 20 600/300/73/100 pin - - 18 w91472cn w91472c 20 600/300/73/100 pin yes yes 20
w91472n series - 2 - pin configurations 1 2 3 4 5 6 7 8 9 16 11 12 13 14 15 10 17 18 c2 c3 c4 v t/p mute xt c1 ss xt c5 r3 r1 r2 dd dtmf v r4 dp/c6 mode hks w91472n/472bn 1 2 3 4 5 6 7 8 9 10 18 13 14 15 16 17 11 12 19 20 c1 c2 c3 c4 ss v xt t/p mute hfi c5 xt w91472an/472cn r4 r1 r2 r3 dd mode v dtmf hks hfo dp/c6 pin description symbol 18-pin 20-pin i/o function column- row inputs 1 - 5 & 15 - 18 1 - 5 & 17 - 20 i the keyboard input is compatible with a standard 5 x 6 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 function. activation of two or more buttons will result in no response except for single tone. xt 7 7 i a built-in inverter provides oscillation with an inexpensive 3.579545 mhz crystal. the oscillator ceases when a keypad input is not sensed. the crystal frequency deviation is 0.02%. xt 8 8 o crystal oscillator output pin. t/p mute 9 9 o the t/p mute is a conventional cmos n-channel open drain output. the output transistor is switched on low level during dialing sequence (both pulse and tone mode). otherwise, it is switched off.
w91472n series publication release date: may 1997 - 3 - revision a2 pin description, continued symbol 18-pin 20-pin i/o function mode 13 15 i pulling mode pin to v ss places dialer in tone mode. pulling mode pin to v dd places dialer in pulse mode with m/b ratio of 40:60 (10 pps, except for 91472bn/472cn = 20 pps). leaving mode pin floating places dialer in pulse mode with m/b ratio of 33.3:66.7 (10 pps, except for W91472BN/472cn = 20 pps). hks 10 12 i the hks 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 v dd by internal resistor. dp / c6 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, d). dtmf 12 14 o during pulse dialing, this pin remains in low state regardless of keypad input. in the tone mode, it will output a dual or single tone. a detailed timing diagram for tone mode is shown in figure 2 (a, b, c, d). r1 r2 r3 r4 c1 c2 c3 specified 697 770 852 941 1209 1336 1477 699 766 848 948 1216 1332 1472 actual +0.28 -0.52 -0.47 +0.74 +0.57 -0.30 -0.34 error % output frequency v dd , v ss 14, 6 16, 6 i power input pins for the dialer chip. v dd is the main power and v ss is the ground.
w91472n series - 4 - pin description, continued symbol 18-pin 20-pin i/o function hfi , hfo - 10, 11 i, o handfree control pins. a low pulse on the hfi input pin toggles the handfree control state. status of the handfree control state is listed in the following table: hook sw. - on hook off hook on hook off hook off hook current state next state hfo low high high - low high input hfi hfi hfi off hook on hook on hook hfo high low low low low high dialing yes no yes yes no yes hfi pin is pulled to v dd by an internal resistor. detailed timing diagram is shown in figure 3. block diagram row column dtmf xt xt hks mode ram counter system clock generator location latch d/a row & column programmable counter data latch & decoder read/write hfi (r1 to r4, vx) (c1 to c5) t/p mute hfo control logic pulse control logic keyboard interface converter dp/c6
w91472n series publication release date: may 1997 - 5 - revision a2 functional description c1 c2 c3 c4 dp / c6 c5 1 2 3 s m1 m4 r1 4 5 6 f4 m2 m5 r2 7 8 9 m3 r3 */t 0 # r/p save r4 f1 f2 f3 vx s: store 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 m1, ..., m5: one-touch memory f1, ..., f4: flash function keys: f1 = 600 ms, f2 = 300 ms, f3 = 73 ms, f4 = 100 ms, and all flash pause time is 1.0 ms note: mn = m1 , ..., m5; dn = 0, ..., 9, */t, #, pause. 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 exceeds 32 digits in nomal dialing. redialing off hook (or on hook & hfi ?? ), d1 , d2 , ..., dn busy, come on hook , off hook (or on hook & hfi ?? ), r/p 1. the redial memory content will be d1, d2, ..., dn. 2. the r/p key can execute the redial function only as first key-in after off-hook. otherwise, it will execute the pause function.
w91472n series - 6 - number store 1. off hook (or on hook & hfi ?? ), d1 , d2 , ..., dn , s , s , mn a. if the sequence of the dialed digits d1, d2, ..., dn has not finished, s will be ignored. b. d1, d2, ..., dn will be dialed out and stored in memory location mn. 2. off hook (or on hook & hfi ?? ), s , d1 , d2 , ..., dn , s , mn a. d1, d2, ..., dn will be stored in memory location mn but will not be dialed out. b. r/p and */t keys can be stored as a digit in memory, but r/p key cannot be the first digit. in store mode, r/p is the pause function key. c. 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. save 1. 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 cause d1 to dn to be duplicated to save memory. 2. on hook , off hook (or hfi ?? ), save d1 to dn will be dialed out after the save key is pressed. repertory dialing off hook (or on hook & hfi ?? ), mn (or save ) the content of memory location mn (or save) will be dialed out. access pause off hook (or on hook & hfi ?? ), d1 , d2 , r/p , d3 , ..., dn 1. the pause function can be stored as a digit in memory. 2. the pause function is executed in normal dialing or redialing or memory dialing. 3. the pause function timing diagram is shown in figure 4.
w91472n series publication release date: may 1997 - 7 - revision a2 pulse-to-tone (*/t) off hook (or on hook & hfi ?? ), d1 , d2 , ..., dn , */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) 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 function timing diagram is shown in figure 5. flash off hook (or on hook & hfi ?? ), fn 1. fn = f1, ..., f4. 2. if fn is pressed, the dialer will execute flash break time of 600 ms (f1), 300 ms (f2), 73 ms (f3), or 100 ms (f4). the pause time is 1.0 second. 3. flash key cannot be stored as a digit in memory. the flash key has first priority among 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 6. cascaded dialing off hook (or on hook & hfi ?? ), 1. normal dialing + repertory dialing + normal dialing (1st sequence) (2nd sequence) 2. repertory dialing + normal dialing + repertory dialing (1st sequence) (2nd sequence) 3. redialing + normal dialing + repertory dialing (1st sequence) (2nd sequence) redialing and save dialing is valid only as the first key-in.
w91472n series - 8 - absolute maximum ratings parameter symbol rating unit dc supply voltage v dd - v ss -0.3 to +7.0 v input/output voltage v il v ss -0.3 v v ih v dd +0.3 v v ol v ss -0.3 v v oh v dd +0.3 v power dissipation p d 120 mw operating temperature t opr -20 to +70 c storage temperature t stg -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. dc characteristics (v dd -v ss = 2.5v, fosc. = 3.58 mhz, t a = 25 c, all outputs unloaded) parameter symbol conditions min. typ. max. unit operating voltage v dd - 2.0 - 5.5 v operating current i op tone - 0.40 0.60 ma pulse - 0.20 0.40 ma standby current i sb hks = 0, no load & no key entry - - 15 m a memory retention current i mr hks = 1, v dd = 1.0v - - 0.2 m a tone output voltage v to row group, r l = 5 k w 130 150 170 mvrm s pre-emphasis - col/row, v dd = 2.0 to 5.5v 1 2 3 db dtmf distortion thd r l = 5 k w , v dd = 2.0 to 5.5v - -30 -23 db dtmf output dc level v tdc r l = 5 k w , v dd = 2.0 to 5.5v 1.0 - 3.0 v dtmf output sink current i tl v to = 0.5v 0.2 - - ma dp output sink current i pl v po = 0.5v 0.5 - - ma
w91472n series publication release date: may 1997 - 9 - revision a2 dc characteristics, continued parameter symbol conditions min. typ. max. unit t/p mute output sink current i ml v mo = 0.5v 0.5 - - ma hfo drive/sink i hfh v hfh = 2.0v 0.5 - - ma current i hfl v hfl = 0.5v 0.5 - - keypad input drive current i kd v i = 0v 4 - - m a keypad input sink current i ks v i = 2.5v 200 400 - m a keypad resistance - - - - 5.0 k w ac characteristics parameter symbol conditions min. typ. max. unit key-in debounce t kid - - 20 - ms key release debounce t krd - - 20 - ms on-hook debounce t ohd - - 150 - ms pre-digit pause 1 t pdp1 mode pin = v dd - 40 - ms 10 pps mode pin = floating - 33.3 - ms pre-digit pause 2 t pdp2 mode pin = v dd - 20 - ms 20 pps mode pin = floating - 16.7 - ms interdigit pause t idp 10 pps - 800 - ms (auto dialing) 20 pps - 500 - ms make/break ratio m:b mode pin = v dd - 40:60 - % mode pin = floating - 33.3:66.7 - % tone output duration t td - 93 - ms intertone pause t itp - 93 - ms flash break time t fb f1 - 600 - ms f2 - 300 - f3 - 73 - f4 - 100 - flash pause time t fp - 1.0 - s pause time t p - 3.6 - s notes: 1. crystal parameters suggested for proper operation are rs < 100 w , lm = 96 mh, cm = 0.02 pf, cn = 5 pf, cl = 18 pf, f osc . = 3.579545 mhz 0.02%. 2. crystal oscillator accuracy directly affects these times.
w91472n series - 10 - timing waveforms t idp hks key in dp t/p mute 2 b m t idp t idp t kid t idp t pdp 2 m b 4 t krd 3 t kid dtmf osc. low oscillation oscillation t pdp figure 1(a). normal dialing timing diagram hks key in dp t/p mute r/p t kid b m t idp t idp t pdp m b dtmf osc. low oscillation t idp t krd t < t ohd figure 1(b). pulse mode auto dialing timing diagram
w91472n series publication release date: may 1997 - 11 - revision a2 timing waveforms, continued hks key in dp t/p mute r/p t kid b m t idp t pdp m b dtmf osc. low oscillation t krd t > t ohd figure 1(c). pulse mode auto dialing timing diagram hks key in t/p mute dtmf 5 4 3 t td osc. dp oscillation 2 t itp t itp t kid high t itp oscillation t krd figure 2(a). tone mode normal dialing timing diagram
w91472n series - 12 - timing waveforms, continued t/p mute hfi hks on hook hfo high chip enble figure 3. handfree timing diagram osc. low oscillation 2 t kid r/p 3 b m t pdp m t idp b t pdp t p hks key in t/p mute dtmf dp figure 4. pause function timing diagram
w91472n series publication release date: may 1997 - 13 - revision a2 timing waveforms, continued hks key in dp dtmf osc. oscillation 2 t kid */t 3 b m t pdp t idp t p t itp t/p mute figure 5. pulse-to-tone timing diagram f f hks t kid dtmf osc. dp key in low 3 t fb f t kid t kid t itp oscillation hfi hfo t fb t fp t/p mute t fp figure 6. flash timing diagram
w91472n series - 14 - 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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