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technical data 1 13 memory tone/pulse dialer with handfree and hold function the in91350a is a silicon cmos ic that provide necessary signal for either pulse or tone dialing. it features handfree dialing, hold, and 13 by 16 digits automatic dialing memory. ? dtmf/pulse switchable dialer ? 32 digits for redial memory ? three by 16 digits for one touch direct repertory ? ten by 16 digits for two touch indirect repertory ? mix dialing is allowable, and the dialing length is unlimited ? pulse to tone (*/t) keypad for long distance call operation ? easy operation with redial, flash, pause and */t keypads ? pause, p- - >t (pulse to tone) can be stored as a digit in memory ? flash time 600 ms ? 4 x 5 keyboard can be used ? power on reset on chip ? use 3.579545 mhz crystal or ceramic resonator ? dial pulse rate: 10 pps in91350a ordering information IN91350AN t a = -20 to 70 c pin assignment
in91350a 2 logic diagram pin 6= gnd pin 16 = v cc keyboard assignments 123stm1 r1 456fm2 r2 789am3 r3 */t 0 # r/p h r4 c1 c2 c3 c4 c5 notes: 1. m1 m3 - one touch memory. the dialing number can be stored in m1 m3 location by store key. 2. st - store function key. 3. h - hold function key. 4. f - flash key. flash key can not be stored in memory. 5. */t - in the pulse mode this key works as pulse - - >tone key, and it works as * key in the tone mode. */t key can be stored as a digit in pulse or tone mode. 6. r/p - redial and pause function key. the redial function can be executed only in first key-in after off hook, otherwise will be operated as pause function. 7. a - indirect repertory dialing function key.
in91350a 3 pin description pin no. designation description 1 - 4 17 - 20 column-row inputs the keyboard input may be used with the standard 4 x 5 keyboard. a valid key entry is defined by a single row being connected to a single column. 5 h/p mute the h/p mute is a conventional inverter output. in pulse dialing, flash and hold period, the output will be at active high, otherwise, it will keep at low state. 6 gnd 16 v cc 7 xt a built in inverter provides oscillation with an inexpensive 3.579545 mhz crystal or ceramic resonator. 8 xt the oscillator output pin. 9 t/p mute the t/p mute is a conventional cmos n-channel open drain output. the output transistor is switched on during pulse and tone mode dialing sequence and flash break. ohterwise, it is switched off. 10, 11 hfi, hf0 handfree control pins. when hfi input pin has a low pulse, the handfree control state is toggled on. status of the handfree control state is listed in the following table: current state next state hook sw. hfo input hfo dialing? xlowhfi highyes on hook high hfi low no off hook high hfi low yes on hook x off hook low yes off hook low on hook low no off hook high on hook high yes hfi pin is pulled to v cc by internal resistor. x = don?t care. 12 hks this pin is the hook switch input. hks = h, on hook state, chip in sleeping mode, no operation. hks = l, off hook state, enable chip on normal operation. this pin must combine to hfi, hfo to perform the above function. please refer to hfi, hfo pin. hks pin is pulled to v cc by internal resistor. 13 dp/c5 open drain dialing pulse output. flash key will cause dp active either in tone mode or pulse mode. 14 dtmf in pulse mode, it always keeps at low state. in tone mode, it will output a dual or single tone. 15 mode pull mode pin to gnd; the dialer is in tone mode. pull mode pin to v cc ; the dialer is in pulse mode - 10 pps, m/b=2/3. pull mode pin to floating; the dialer is in pulse mode - 10 pps, m/b=1/2. power supply pins. this device is designed to operate from 2.0 v to 5.5 v.
in91350a 4 operation 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 was taken off the hook. on hook means that the receiver is on the hook. d1 or l1 stands for the first digit dialed in a string of digits. dn or ln stands for the last digit dialed in a string of digits. dn+1 stands for the beginning of a new string of digits. dn+m stands for the last digit in a new string of digits. input level from high to low. mn=m1 m3; ln=0 9; dn=0 9,*,#,pause. 1. 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 the redial is inhibited if it oversteps 32 digits. 2. redialing off hook , d1 , d2 , .. , dn , busy, come on hook , off hook (or on hook & hfi ), r/p (or on hook & hfi , d1 , d2 , ... , dn ,busy, hfi ,come hfi , r/p the r/p key can execute redial function only in first key-in after off hook, otherwise it will be pause function. 3. number store 1. off hook (or on hook & hfi ), d1 , d2 ,..., dn , st , st , mn or ln on hook (or on hook & hfi ) a. the dialing of d1, d2, ... , dn must have finished, then st key may be pressed. b. d1, d2, ... , dn will be stored in mn or ln memory location and they will be dialed out. 2. off hook (or on hook & hfi ), st , d1 , d2 ,..., dn , st , mn or ln on hook (or on hook & hfi ) a. d1, d2, ... , dn will be stored in mn or ln memory location but they will not be dialed out. b. r/p and */t keys can be stored as a digit in memory. in store mode, r/p in the pause function key. c. the store mode can be release after the store function is executed or the present state of hook switch is changed. 4. repertory dialing 1. off hook (or on hook & hfi )mn 2. off hook (or on hook & hfi ) a, ln 5. 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 in normal dialing or redialing or memory dialing. 6. pulse to tone (*/t) off hook (or on hook & hfi ), d1 , d2 , ... , dn , */t , dn+1 , dn+2 , ... , dn+m 1. if the mode switch is set in pulse mode, then the output signal will be: d1, d2, ... , dn, pause (pulse) dn+1, dn+2, ... , dn+m (tone) 2. if the mode switch is set in tone mode, then the output signal will be: d1, d2, ... , dn, (tone) , * , dn+1, dn+2, ... , dn+m (tone) (tone) 3. it can be reset to pulse mode only in operation of on hook, because it?s still in tone mode when the digits have been dialed out.
in91350a 2 7. flash off hook (or on hook & hfi ) f 1. flash key can not be stored as a digit in memory and it has the first priority of the keyboard function. 2. the system will return to the initial state after the break time is finished. 8. mix dialing off hook (or on hook & hfi ) 1. normal dialing + repertory dialing + normal dialing 2. repertory dialing + normal dialing + repertory dialing 3. redialing + normal dialing + repertory dialing a. redialing and save dialing are valid just for first key in. b. the second sequence should not be operated until the first sequence is dialed out completely. maximum ratings * symbol parameter value unit v cc dc supply voltage (referenced to gnd) -0.3 to +7.0 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 p d power dissipation in still air, plastic dip ** 500 mw tstg storage temperature -55 to +150 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. recommended operating conditions symbol parameter min max unit v cc dc supply voltage (referenced to gnd) 2.0 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.
in91350a 2 all outputs unloaded dc electrical characteristics (voltages referenced to gnd, v cc =2.5 v, t a =25 c*, f osc . = 3.58 mhz) guaranteed limits symbol parameter test conditions min typ max unit i cct tone mode - 0.50 i ccp pulse mode - 0.30 i sb maximum standby current hks = 0 no load & no key entry -15 a i mr maximum memory retention current hks = h v cc = 1.0 v -0.2 a v to dtmf output voltage row group, r l = 5 k ? 130 170 mvrms t wist pre-emphasis col/row, v cc = 2.0 5.5 v 13db t hd dtmf distortion r l = 5 k ? , v cc = 2.0 5.5 v - -23 db v tdc dtmf output dc level r l = 5 k ? , v cc = 2.0 5.5 v 1.1 2.8 v i tl minimum dtmf sink output current v to = 0.5 v 0.2 ma i pl minimum dp sink output current v po = 0.5 v 0.5 ma i ml minimum t/p mute sink output current v mo = 0.5 v 0.5 ma r kh hks i/p pull high resister 300 k ? i hfh v hfh = 2.0 v 0.5 - i hfl v hfl = 0.5 v 0.5 - i kd keypad input drive current v in = 0 v 4 30 a i ks minimum keypad input sink current v in = 2.5 v 200 - a maximum keypad resistance -5.0 k ? * - from -20 c to +70 c values of parameters are specifying. maximum operating current minimum hfo drive/sink current ma ma
in91350a 3 ac electrical characteristics (all voltages referenced to gnd. v cc = 2.0 v to 5.5 v, t a = 25 c*) guaranteed limits symbol parameter test conditions min typ max unit t kid keypad active in debounce (figures 1,2,4-6) -20 -ms t krd key release debounce (figure 2) - 20 - ms m/b = 2/3 - 40 - m/b = 1/2 - 33.3 - t idp inter digit pause time (auto dialing) (figures 1,2,4,5) - 800 - ms m/b = 2/3 - 40/60 - m/b = 1/2 - 33/67 - t td dtmf output duration (figure 2) - 100 - ms t itp inter tone pause (figure 2) - 100 - ms t fb flash break time (figure 6) - 600 - ms t p pause time (figure 5) - 3.6 - s * - from -20 c to +70 c values of parameters are specifying comparisons of specified vs. actual tone frequencies r/c spec. actual error(%) unit conditions r1 697 699 +0.28 hz r2 770 766 -0.52 hz r3 852 848 -0.47 hz r4 941 948 +0.74 hz f osc = 3.579 mhz c1 1209 1216 +0.57 hz c2 1336 1332 -0.30 hz c3 1477 1472 -0.34 hz t pdp m/b pre-digit-pause (figures 1,4,5) make/break ratio ms % auto dialing
in91350a 4 figure 1. pulse mode figure 2(a). tone mode normal dialing
in91350a 5 figure 2(b). tone mode auto dialing figure 3. control function and hold function relationship
in91350a 6 figure 4. pause function figure 5. p - - >t operation in normal dialing
in91350a 7 figure 6. flash operatio expanded logic diagram

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