technical data 1 10 memory tone/pulse dialer high-performance silicon-gate cmos the in91260c is tone/pulse switchable dialer with ten 16-digit number memories and 32-digit redial memory. pulse to tone mode switching is performed via a slide switch. ? 32-digit redial memory (31 digits in tone mode) ? ten indirect memories, 16 digits in pulse mode, 15 digits in tone mode ? tone/pulse mode switching via slide switch (4.1 second pause inserted automatically) ? wide operating voltage: 1.8 v 5.5 v ? uses 480 khz ceramic resonator ? low memory retention current ? selectable make/break ratio ? dial pulse rate: 10 pps keyboard assignments* 123 s r1 456 a/l r2 789 p r3 *0# r r4 c1 c2 c3 c4 in91260c ordering information IN91260CN t a = -20 to 70 c pin assignment logic diagram pin 11 = gnd pin 10 = v cc s: store a/l : auto/location p: pause r: redial
in91260c 2 pin description pin no. designation description 1r1 2r2 3r3 4r4 5 hk hook switch input. when hk = v cc , an on-hook state exists. when hk = gnd, an off-hook state exists. 6 m/b dial pulse make/break ratio select input. if m/b = v cc , the make/break ratio is 1/2. if m/b = gnd, the make/break ratio is 2/3. 7 mode select pulse/dtmf mode select input. if mode select = v cc , pulse mode is in effect. if mode select = gnd, dtmf mode is in effect. 8 9 osci osc0 oscillator i/o. a 480 khz ceramic resonator and two 100 pf serial loading capacitors form a complete oscillator circuit. the circuit is activated when hk is low. oscillator start-up time is typically 10 ms. 10 v cc 11 gnd 12 tone dtmf signal output. pull-down load resistance is 10,000 ? . the minimum tone and idp durations are built-in for both normal dialing and redialing. 13 xmute transmit mute output. this is an n-channel open drain output. the output transistor is switched on while a sequence of digits is being dialed (for both pulse and tone modes). otherwise, it is switched off. 14 dp dial pulse output. this pin is an n-channel open drain output. when dp output is low (switched on), it serves as a break signal in pulse dialing. for other operations, dp output is normally high impedance (switched off). 15 c1 16 c2 17 c3 18 c4 keyinputs. when a row and a column are connected, a key operation is activated. scanning signals are present on both the row and column pins during a valid key-in condition. keyinputs. when a row and a column are connected, a key operation is activated. scanning signals are present on both the row and column pins during a valid key-in condition. positive power supply. negative power supply.
in91260c 3 operation procedures symbol definitions: a. d p : pulse digit, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 b. d t : tone digit, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, *, # c. loci : i = 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 d. zizizi : conversation mode e. 0 - 0 : off-hook f. 0 - 0 : on-hook g. : input level from low to high h. : input level from high to low recommended dialing, redialing, mixed dialing and storing operations: 1. normal dialing in pulse mode 0 - 0 , d p . . . d p , zizizi 0 - 0 2. normal dialing in tone mode 0 - 0 , d t . . . d t , zizizi 0 - 0 3. mixed dialing in pulse-to-tone mode 0 - 0 , d p . . . d p , mode select , d t . . . d t , zizizi 0 - 0 4. redialing 0 - 0 , d p . . . d p 0 - 0 , 0 - 0 , r, zizizi, 0 - 0 0 - 0 , d t . . . d t 0 - 0 , 0 - 0 , r, zizizi, 0 - 0 5. storing numbers to repertory memory (i) off-hook store 0 - 0 , s , d p . . . d p or d t . . . d t , a/l , loci, 0 - 0 (ii) on/off-hook store: 0 - 0 , s , d p . . . d p or d t . . . d t , a/l , loci 6. dialing from repertory memory 0 - 0 , a/l , loci, zizizi 0 - 0 functional description 1. n-channel open drain output - dp, xmute f igure 1. 2. dtmf generator the digitally synthesized sinewave of the in91260 series is well designed, with a 6 level, 12 segment, 1/2 v cc reference voltage. the thd (total harmonic distortion) of the dtmf output is typically 1%, when v cc = 2.5 v to 5.5 v and frequency is in the 500 hz to 3400 hz band. maximum ratings * symbol parameter value unit v cc dc supply voltage (referenced to gnd) -0.3 to +6.0 v v in dc input voltage (referenced to gnd) -0.3 to v cc +0.3 v v out dc output voltage (referenced to gnd) -0.3 to v cc +0.3 v v out dc output voltage (dp, xmute) -0.3 to 1.2 v i tone dc output current(tone) 50 ma p d power dissipation in still air, plastic dip ** 500 mw tstg storage temperature -40 to +125 c * maximum ratings are those values beyond which damage to the device may occur. functional operation should be restricted to the recommended operating conditions. ** durating: -10 mw / c from 65 c to 70 c.
in91260c 2 recommended operating conditions symbol parameter min max unit v cc dc supply voltage (referenced to gnd) 1.8 5.5 v v in dc input voltage (referenced to gnd) 0 v cc v v out dc output voltage (referenced to gnd) 0 v cc v t a operating temperature -20 +70 c this device contains protection circuitry to guard against damage due to high static voltages or electric fields. however, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high-impedance circuit. for proper operation, v in and v out should be constrained to the range gnd (v in or v out ) v cc . unused inputs must always be tied to an appropriate logic voltage level (e.g., either gnd or v cc ). unused outputs must be left open. dc electrical characteristics (voltages referenced to gnd, v cc =1.8 v to 5.5 v, t a = -20 to +70 c) guaranteed limits symbol parameter test conditions min max unit v ih high-level input voltage 0.8v cc v cc v v il low-level input voltage 0 0.2v cc v v mr minimum memory retention voltage v cc = 1.0 v 1.5 v r load = 10 k ? v cc = 2.5 v 540 640 r load = 10 k ? v cc = 5.5 v 100 1300 r load = 10 k ? v cc = 2.5 v 410 490 r load = 10 k ? v cc = 5.5 v 850 990 i c * column input current v in =3.5 v all outputs unloaded 0.6 2.0 ma i r * row input current v in = 0 v all outputs unloaded 5 50 a i ol1 v cc = 3.5 v, v ol = 0.4 v 0.7 ma i ol2 v cc = 2.0 v, v ol = 0.4 v 0.2 ma i mr maximum memory retention current v cc = 1.0 v, hk = v cc all outputs unloaded 0.6 a v cc =3.5 v 0.7 v cc =5.5 v 2.1 v cc =3.5 v 1.3 v cc =5.5 v 3.9 i sd maximum standby current v cc = 2.5 v, hk = gnd all outputs unloaded 7.0 a t wist pre.-emphasis v cc = 3.5 v 1 3 db v v valley of single tone v cc = 3.5 v 0.3 6.0 v dd dis% distortion *note 1, v cc = 3.5 v 6.0 % * @ 25 c single column tone output amplitude single row tone output amplitude maximum supply operation current mvp-p mvp-p v oc * v or * minimum sink output current dp, xmute oscillator running; all outputs unloaded, v il = 0, v ih = v cc i ccp i cct ma ma
in91260c 3 note 1: dis% = a. v 1 . . . v n are the intermodulation or the harmonic frequencies in the 500 hz to 3400 hz band. b. v oc and v or are the individual frequency components of the dtmf signal. ac electrical characteristics (all voltages referenced to gnd. v cc = 1.8 v to 5.5 v, t a = -20 to +70 c, f osk = 480 khz) guaranteed limits symbol parameter test conditions min max unit pulse m/b = 1/2 30 35 m/b = 2/3 38 42 m/b = 1/2 64 69 m/b = 2/3 57 63 m/b = 1/2 790 815 m/b = 2/3 790 815 m/b = 1/2 820 860 m/b = 2/3 820 860 m/b = 1/2 0 3 m/b = 2/3 0 3 tone t mfd minimum tone duration (figure 3) 100 120 ms t tidp minimum tone inter-digit pause (xmute) (figure 3) 100 120 ms t tpdp tone output pre-digit pause (figure 3) 115 145 ms t mdt xmute delay time (figure 3) 100 120 ms t ap auto pause time (figure 4) 3.9 4.3 s t start oscillator start-up time (figure 2) 4 13 ms t ms xmute start-up time (figure 2) 25 35 ms key-in t kd keypad debounce time (figure 2) 19 25 ms f ks key scan frequency c1 c4, r1 r4 365 390 hz t m t b t idp t pdp t mdp make time (figure 2) break time (figure 2) inter digit pause time (figure 2) pre-digit pause (figure 2) xmute, delay time (figure 2) ms ms ms ms ms 100.(v 1 2 + v 2 2 +. . . + v n 2 ) 1 / 2 (v oc 2 + v or 2 ) 1 / 2
in91260c 4 comparisons of specified vs. actual tone frequencies r/c spec. actual error(%) unit conditions r1 697 695.65 -0.19 hz r2 770 769.23 -0.1 hz r3 852 851.06 -0.11 hz r4 941 941.18 +0.02 hz f osc =480 khz c1 1,209 1,212.12 +0.26 hz c2 1,336 1,333.33 -0.2 hz c3 1,477 1,481.48 +0.3 hz figure 2. pulse mode figure 3. tone mode
in91260c 5 figure 4. normal pulse to tone mixed dialing via slide switch expanded logic diagram
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