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NT91214/15 series tone/pulse dialer 1v1.0 features ? one touch redial operation ? tone/pulse switchable ? 32 digit capacity for redialing ? automatic mixed redialing (last number redial) of pulse to dtmf with multiple automatic access pauses ? pabx auto-pause is 2.2 seconds ? dtmf timing: manual dialing: minimum duration for bursts and pauses redialing: calibrated timing ? hands-free control function ? wide operating voltage range: 2v to 5.5v ? key-in beep tone output ? digits dialed manually after redialing are cascadable and stored as additional digits for the next redialing ? uses inexpensive ceramic resonator (3.58 mhz) ? two versions for different telephone systems ? built-in power up reset circuit ? four extra function keys: flash, pause, redial and dp or dtmf mixed dialing ? 4 x 4 (or 2 x 8) keyboard can be used ? low standby current general description the NT91214/15 is a single-chip, s ilicon gate, cmos integrated circuit with an on-chip oscillator for a 3.58mhz crystal or ceramic resonator. it provides a dialing pulse (dp) or dual tone multi-frequency (dtmf) dialing. a standard 4 x 4 matrix keyboard can be used to support either dp or dtmf modes. up to 32 digits can be saved in the on-chip ram for redialing. in the dtmf mode, a short minimum tone duration and minimum intertone pause allows rapid dialing. maximum tone duration depends on the key depression time during manual dialing. pin configurations a. 16-pin package b. 18-pin packages c. 20-pin package (i) key tone output (ii) hands-free control
NT91214/15 series v1.0 2 keyboard assignments 123 f1 r1 456 f2 r2 789 p r3 */t 0 # rd r4 c1 c2 c3 gnd 1. */t -- in pulse mode this key works as pulse ? dtmf key (t key). in dtmf mode the key works as * key. */t key will occupy one memory digit in either use. 2. f1 -- flash key. the break time is 297 ms or 96 ms (NT91214/15 respectively) 3. f2 -- flash key for break time 640 ms 4. p -- pause key (2.2 seconds) 5. rd -- one key redial key 6. # -- in pulse mode this key input is neglected. in dtmf mode this key works as # key. block diagram
NT91214/15 series v1.0 3 absolute maximum ratings* supply voltage (vdd). . . . . . . . . . . . . . . . . . . . 6.0v input voltage (v in ) . . . . . . .vss - 0.3v to vdd + 0.3v output voltage (v out ) . . . . vss - 0.3v to vdd + 0.3v output voltage (v out )( dp , xmit mute ) . . . . 1.2v tone output current (i tone ) . . . . . . . . . . . . . . 50ma power dissipation (p d ) . . . . . . . . . . . . . . . . . 500mw operating temperature (top). . . . . . . -20 c to +70 c storage temperature (tstg). . . . . . . -40 c to +150 c *comments stresses above those listed under "absolute maximum ratings" may cause permanent damage to this device. these are stress ratings only. functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied or intended. exposure to the absolute maximum rating conditions for extended periods may affect device reliability. dc electrical characteristics (vdd = 3.5v, vss = 0v, fosc = 3.579mhz, top = 25 c) parameter symbol min. typ. max. unit conditions test kt. operating voltage vdd 2.0 5.5 v pulse mode a 2.0 5.5 tone mode memory retention voltage v mr 1v - memory retention current i mr 0.05 0.4 m a vdd = 1.0v, hk = vdd all outputs unloaded - operating current i ddp 0.32 1.0 ma pulse mode all outputs a i ddt 0.6 2.0 tone mode unloaded standby current iso 0.03 0.05 m a hk = vdd = 1.5v all outputs unloaded, a 0.5 10 hk = vss no key selected input current v ih 0.8 1 vdd v il 00.2 r1 - r4 input current i r 115 m a c tone out voltage v oc 584 730 876 mvp-p column vdd = 3.5v d v or 456 570 684 row r l = 5k hfi pull low current i hfi 5 m a vdd = 3.5v (note 1) hfi pin connected to 0v b
NT91214/15 series 4v1.0 dc electrical characteristics (continued) parameter symbol min. typ. max. unit conditions test kt. hfo drive current i oh1 0.4 2 ma vdd = 3.5v v oh = vdd - 0.4v b hfo, kt , modeout xmitmute sink current i ol1 0.9 5.3 ma vdd = 3.5v v ol = 0.4v b dp sink current i ol2 1.1 5.3 ma vdd = 3.5v , v ol = 0.4v b distortion dis% 1 5 % * see note below * note: dis% = 100 * (v v ... v ) (v v ) 22 2 22 1/ 2 1/ 2 12 n il ih +++ + 1. v 1 . . . . v n are the intermodulation or the harmonic frequencies in the 500hz to 3400hz band. 2. v il and v ih are the individual frequency components of the dtmfsignal. ac characteristics (vdd = 3.5v, vss = 0v, f osc = 3.579mhz, top = 25 c, unless otherwise specified.) parameter symbol min. typ. max. unit conditions 33.3 10pps m/b = 1/2 make time t m 40.0 ms m/b = 2/3 16.7 20pps m/b = 1/2 20.0 m/b = 2/3 66.6 10pps m/b = 1/2 break time t b 60.0 ms m/b = 2/3 33.3 20pps m/b = 1/2 30.0 m/b = 2/3 inter-digit pause time t idp 824 ms 10pps 458 20pps pause time t pau 2.2 sec
NT91214/15 series 5v1.0 ac characteristics (continued) parameter symbol min. typ. max. unit conditions auto-redial break time t aobk 2.2 sec * optional delay time key valid to signal out t d 0ms key-in debounce t kd 21 ms key release debounce time t kld 5.2 ms key-in tone duration t ktd 23 ms key-in tone frequency f kt 437 h z minimum tone duration time t mfd 94 ms min. tone inter-digit pause t tidp 96 ms redial tone duration t mfdr 94 ms redial tone inter-digit duration t tidpr 96 ms comparisons of specified vs. actual tone frequencies r/c spec. actual error (%) unit conditions r1 697 699.1 +0.31 hz r2 770 771.5 +0.19 hz r3 852 852.3 +0.03 hz r4 941 942.0 +0.10 hz fosc = 3.579mhz c1 1,209 1,215.7 +0.57 hz c2 1,336 1,331.7 -0.32 hz c3 1,477 1,471.9 -0.35 hz
NT91214/15 series 6v1.0 pin descriptions pin no. nt91215a NT91214a nt91215b NT91214b nt91215c NT91214c nt91215d NT91214d designation i/o description 3 4 3 4 4 5 4 5 osci osco i oscillator i nput and output pins the time base for the NT91214/15 is a crystal controlled on-chip oscillator, which is completed by connecting a 3.58mhz crystal or ceramic resonator between the osci and osco pins. 2233mode ini, ztri-state mode select pin there are two versions of the NT91214/15 as follows: a. nt91215 series is for european and american systems. mode in tone/ pulse dial rate m/b ratio vdd pulse 10pps 2/3 vss tone - - floating pulse 10pps 1/2 b. the NT91214 series is for the japanese system. mode in tone/ pulse dial rate m/b ratio vdd pulse 10pps 1/2 vss tone - - floating pulse 20pps 1/2 the mode selection pin is checked for tone/pulse dialing as each digit key entery. in the pulse mode, the dialing rate is checked, along with the make/break ratio, at first key entry.
NT91214/15 series 7v1.0 pin descriptions (continued) pin no. nt91215a NT91214a nt91215b NT91214b nt91215c NT91214c nt91215d NT91214d designation i/o description 1122 hk i hook switch input this inverter input pin detects the state of the hook switch contact. " off hook" is represented by a vss condition. "on hook" is represented by a vdd condition. (n.a.) 10 (n.a.) 11 kt o key-in tone output this n-channel open drain pin sends out a "beep" tone for each pulse mode key entry, along with entries of accepted function keys (rd, t, f1 f2, and p keys). the tone output frequency is 437hz and tone duration is 23 ms. 9 111012 dp o dialing pulse output this is an n-channel open drain output. the normal output will be "on" during break and "off" during make in the pulse dialing mode.
NT91214/15 series 8v1.0 pin descriptions (continued) pin no. nt91215a NT91214a nt91215b NT91214b nt91215c NT91214c nt91215d NT91214d designation i/o description 1 1 hfo o hands-free control i/o pins these pins enable and disable the hands- free control function. when input pin hfi goes low, the hands-free control state is toggled on. the status of the hands-free control state is listed in the following table: (n.a.) (n.a.) current state next state hook sw. hfo input hfo dialing? - low hfi high yes 18 20 hfi ion 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 7788toneotone dialing output when a valid keypress is detected in the dtmf mode, appropriate low group and high group, frequencies are generated which hybridizes the dual tone output. tone output is in the "off" state in pulse mode.
NT91214/15 series 9v1.0 pin descriptions (continued) pin no. nt91215a NT91214a nt91215b NT91214b nt91215c NT91214c nt91215d NT91214d designation i/o description 8899 xmitmute o dialing transmission mute output this is an n-channel open drain output the xmitmute is normally "off" during pulse of dtmf dialing this output is "on". (n.a.) 9 (n.a.) 10 mode out o mode output pin this is an n-channel, open drain output it is "on" during tone output and "off" during pulse output. 13 15 14 16 r1 keyboard pins 14 16 15 17 r2 this input serves as the interface to an xy matrix keyboard. on a 4 x 4 matrix 15 17 16 18 r3 keyboard, the input from the fourth column, c4 , should be connected to 16 18 17 19 r4 vss. 10 12 11 13 c1 11 13 12 14 c2 12 14 13 15 c3 6677vdd power supply pins 5566vss these devices are designed to operate from 2.0v to 5.5v.
NT91214/15 series 10 v1.0 operating procedures symbol definitions: in the description below, signals are defined in terms of the key or switch which is activated. off hook means the phone is off the hook. on hook means that the phone is on the hook. d1 represents for the first digit dialed in a string of digits. dn ( dk ) represents for the last digit dialed in a string of digits. dn+1 represents for the beginning of a new string of digits. dn+m represents for the last digit in a new string of digits. hfi represents for the switch that activates the hands-free dialing mode going low */t is the pulse-to-dtmf key rd is the redial key. 0 is the zero key. p is the pause key. f is the flash key. recommended operation: 1. pulse mode operation a. off hook d1 . . . dn pulse mode is defined as the initial mode, provided the first keyboard input is not the */t key following the off hook c ondition and the mode selection pin is floating (mode in = vdd or floating). b. on hook hfi d1 . . . dn pulse mode is defined as the initial mode, provided the key input d1 is not */t while the mode selection pin is vdd or floating. the chip will pause for 824 ms automatically after it detects an off hook condition or if the hfi key is depressed. it then proceeds with pulse or dtmf dialing if any keys have been depressed. the dialing rate or make/break ratio is decided at the first key entry by checking the mode in status and will not be altered. the mode in status can only switch the dialing mode from pulse to dtmf after the first key entry. 2. dtmf mode operation a. off hook d1 . . . dn or on hook hfi d1 . . . dn dtmf mode is defined as the initial mode if the mode selection pin mode in is vss. b. off hook */t d1 . . . dn or on hook hfi */t d1 . . . dn the initial mode is pulse mode if the mode selection pin, mode in, is vdd or floating. the */t key can switch the dialing mode to tone mode. unlike normal mode switching, the */t key entry,
NT91214/15 series 11 v1.0 as the first key pressed, will not pr oduce any pause time. there are only 31 digits of redial memory available in the buffer to be used for operations a and b, since the mode switching key, */t , will occupy one digit of space.
NT91214/15 series 12 v1.0 3. manual dialing with automatic access pause a. off hook o p d1 . . . dn pause key entries can be accepted and stored in the redial memory. each is stored as a digit. each key-in will provide a pause of 3.57 seconds, depending on which model is being used. 4. redial a. on hook rd or on hook hfi rd up to 32 digits (in pulse mode) or 31 digits (in tone mode) can be dialed using the rd key. the rd key is disabled while pulse or tone signals are being transmitted. redial w ill also be inhibited if the last number dialed exceeds 32 digits because the redial memory can only hold 32 digits. b. off hook rd d1 . . . dn or on hook hfi rd d1 . . . dn after pressing the rd key, digits may be added to the number in redial memory. when finished dialing, the redial memory will contain the original digits, plus the digits dialed after pressing rd . each time the redial key is pressed, the stored number will be dialed exactly the same as it was previously, regardless of the status of the mode in pin. 5. tone/pulse switching operation a. on hook d1 . . . dn mode in pin pulse mode switched to vss dn+1 . . . dn+m dtmf mode the mode selection pin is alwsys checked for tone or pulse mode key entry. dialing can be switched from pulse to tone mode, but not from tone to pulse mode. switching the mode in pin to the original digits plus the digits dialed after pressing will cause the chip to store a */t digit prior to the first tone digit in the redial memory and w ill automatically insert a 2.2 second pause before the tone digits are dialed out. after the mode bas been switched, the status of the mode selection pin will no l onger be checked. therefore, it will not be possible to switch from tone to pulse mode. b. off hook d1 . . . dn */t dn+1 pulse mode . . . dn+m dtmf mode pulse mode is initially defined with the mode selection pin, mode in, equal to vdd or floating. at this time, the mode can be switched to dtmf by pressing the */t key. dtmf mode will being as soon as the last pulse has been transmitted. in this mode, dn+1 through dn+m are sent through the tone out pin as dtmf signals. if a p key entry is contained in the series of digits before or after the */t entry, or the mode in switch is depressed, 2.2 second pause w ill be added to the automatically inserted pause time, which is also 3.57 seconds. both of the
NT91214/15 series 13 v1.0 above switching modes can store as many as 31 digits in the redial memory.
NT91214/15 series 14 v1.0 6. one-key redialing off hook d1 . . . dn rd or on hook hfi d1 . . . dn rd if the dialing of d1 to dn is finished, pressing rd will cause the pulse dialing pin to go low for 1.67 seconds of break time and an 824 ms pause will automatically be added. if the pulses of the number dialed with d1 to dn have not finished, the pressing of the redial key will be i gnored. 7. flash dialing off hook f d1 . . . dn or on hook hfi f d1 . . . dn the flash keys emulate quick on-off hook operations. pressing the flash keys, f1 or f2 , will cause a break of 96 ms or 640 ms (or, 297 ms or 640 ms, depending on the model) on the dp output pin. then, it pauses for 824 ms and continues dialing the digits, d1 to dn . these digits are then stored in the redial memory. each time the flash key is pressed, the redial memory will be cleared to store a new entry. in addition, the mode in status will be checked again for the setting of the tone/pulse dialing mode. similarly, to make sure that the ic is working properly, new flash key inputs w ill be i gnored as long as the digits that were dialed have not finished. timing waveforms 1. timing waveform in pulse mode: key input 2 3 xmit mute hk or hfo 1 kt t kd : debouncing time 21 ms t ktd (23 ms), f = 437hz t d t idp t m t m 21ms t m t b dp td: delay time of key valid to dialing signal out, typically 0ms t idp : inter-digit pause time t kto : key-in tone duration t kd : debouncing time note: " hk " or "hfo" indicates chip works when hook switch " hk " goes low or hands-free control output hfo goes high.
NT91214/15 series 15 v1.0 timing waveforms (continued) 2. timing waveform in tone mode: (i) normal dialing key input 4 9 xmit mute hk or hfo * kt t kd t d tmfd:94ms 2.3ms 3 2.5ms 2.3ms 2.3ms tone t tidp :96ms mode out (ii) after (i), redialing ? ???? ? ?? ???? e ?e ? ? ? 3??? ?e?? e?? ?e?? ? ??? ? ???
NT91214/15 series 16 v1.0 timing waveforms (continued) 3. timing waveform for switching mode operation: (i) by mode selection pin switches key input 2 4 xmit mute hk or hfo */t kt t m 3 tone mode out 6 **** ******************* **** mode in dp t idp t m t idp t idp t idp t d t pau t mfd (ii) by */t key entry ? ???? 3 ?? ???? e ?e ?? ? ? ? ?e?? ?e?? e?? ?????????????????????????????????????????????????????????????????? ? ?e?? ? ?? ? ? ? ?? ? ?? ? ? ? ?a? ? ??? ? ?? 3??? 3??? t pau : pause time (2.2 secs)
NT91214/15 series 17 v1.0 timing waveforms(continued) 4. one key redial (dtmf mode used as example): key input 2 xmit mute hk or hfo rd t d 3 tone mode out dp 2.5ms t aobk t d 2.5ms t aobk : break time (2.2 secs) 5. flash dialing (dtmf mode used as example): key input f xmit mute hk or hfo tone mode out dp t fsh t pau 2.5ms // 64 3 // 2.5ms // // // // tfsh: flash time 96 or 640 ms (f1 or f2 respectively) for nt91215 flash time 297 or 640 ms (f1 or f2 respectively) for NT91214
NT91214/15 series 18 v1.0 application circuit (for reference only) ??o232?2? ?2 3 2 ?3 ? o ? 1 ? ? 2 3 ? ?3 ?2 ?? ? 3 ?e?? ?? ???? 23 ?? ?? ?? ? ?? 33 2 m ? ? ? ? ? ? 3? 2 3? ? 2 e? ee e?? ee 2 2 2 ao3 ao3 a3 3 m ? ? ? ?o ? 33 ? ? ? 1? 33? ? ? m ? 2 a??? ??? ?2 e? ee e?? ee ee ???? 2 3 m ? 1? e?? ????e a???? ????e ?? ? e??2 e?? ?? ?e?? ? ?? ? 23 ?? ???? ?e?? 3? 3? ??1 ?? ??a?? ??e?a?e ?e?? e?? ?? 2 ?? ? 1? ?? 2 ???e 2
NT91214/15 series 19 v1.0 test circuits (a) (b) (c) (d) oscilloscope: tektroni x 468 specturm analyzer: hp3585a
NT91214/15 series 20 v1.0 ordering information part no. key tone hands-free dial rate m/b ratio flash package control f1 f2 NT91214a n.a. n.a. 16l dip NT91214b a n.a. 10/20pps 1/2 297 ms 640 ms 18l dip NT91214c n.a. a 18l dip NT91214d a a 20l dip nt91215a n.a. n.a. 16l dip nt91215b a n.a. 10pps 1/2 96 ms 640 ms 18l dip nt91215c n.a. a 2/3 selectable 18l dip nt91215d a a 20l dip
NT91214/15 series 21 v1.0 package information dip 16l outline dimensions unit: inches/mm 18 16 d e 1 s a 2 a l c e e a a 9 b 1 b e 1 base plane a 1 seating plane symbol dimensions in inches dimensions in mm a 0.175 max. 4.45 max. a 1 0.010 min. 0.25 min. a 2 0.1300.010 3.300.25 b 0.018 +0.004 0.46 +0.10 -0.002 -0.05 b 1 0.060 +0.004 1.52 +0.10 -0.002 -0.05 c 0.010 +0.004 0.25 +0.10 -0.002 -0.05 d 0.750 typ. (0.770 max.) 19.05 typ. (19.56 max.) e 0.3000.010 7.620.25 e 1 0.250 typ. (0.262 max.) 6.35 typ. (6.65 max.) e 1 0.1000.010 2.540.25 l 0.1300.010 3.300.25 a 0 ~ 15 0 ~ 15 e a 0.3450.035 8.760.89 s 0.040 max. 1.02 max. notes: 1. the maximum value of dimension d includes end flash. 2. dimension e 1 does not include resin fins. 3. dimension s includes end flash.
NT91214/15 series 22 v1.0 package information dip 18l outline dimensions unit: inches/mm 19 10 18 d e 1 s a 2 a l c e e a a base plane a 1 seating plane e 1 b 1 b symbol dimensions in inches dimension in mm a 0.175 max. 4.45 max. a 1 0.010 min. 0.25 min. a 2 0.1300.010 3.300.25 b 0.018 +0.004 0.46 +0.10 -0.002 -0.05 b 1 0.060 +0.004 1.52 +0.10 -0.002 -0.05 c 0.010 +0.004 0.25 +0.10 -0.002 -0.05 d 0.900 typ. (0.920 max.) 22.86 typ. (23.37 max.) e 0.3000.010 7.620.25 e 1 0.250 typ. (0.262 max.) 6.35 typ. (6.65 max.) e 1 0.1000.010 2.540.25 l 0.1300.010 3.300.25 a 0 ~ 15 0 ~ 15 e a 0.3450.035 8.760.89 s 0.055 max. 1.40 max. notes: 1. the maximum value of dimension d includes end flash. 2. dimension e 1 does not include resin fins. 3. dimension s includes end flash.
NT91214/15 series 23 v1.0 package information dip 20l outline dimensions unit: inches/mm 110 11 20 d e 1 s a 2 a l c e e a a b 1 b e 1 base plane a 1 seating plane symbol dimensions in inches dimensions in mm a 0.175 max. 4.45 max. a 1 0.010 min. 0.25 min. a 2 0.1300.010 3.300.25 b 0.018 +0.004 0.46 +0.10 -0.002 -0.05 b 1 0.060 +0.004 1.52 +0.10 -0.002 -0.05 c 0.010 +0.004 0.25 +0.10 -0.002 -0.05 d 1.026 typ. (1.046 max.) 26.06 typ. (26.57 max.) e 0.3000.010 7.620.25 e 1 0.250 typ. (0.262 max.) 6.35 typ. (6.65 max.) e 1 0.1000.010 2.540.25 l 0.1300.010 3.300.25 a 0 ~ 15 0 ~ 15 e a 0.3450.035 8.760.89 s 0.078 max. 1.98 max. notes: 1. the maximum value of dimension d includes end flash. 2. dimension e 1 does not include resin fins. 3. dimension s includes end flash.

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