Dmr 99 SEMICONDUCTOR ICMA, ICMB ICMD -Diit Multi-Funtion Frquny Countr/Timr Fturs All Vrsions Funtions s Frquny Countr (DC to 0MHz) Four Intrnl Gt Tims: 0.0s, 0.s, s, 0s in Frquny Countr Mo Dirtly Drivs Diits n Smnts o Lr Multiplx LED Displys (Common Ano n Common Ctho Vrsions) Sinl Nominl V Supply Rquir Hihly Stl Osilltor, Uss MHz or 0MHz Crystl Intrnlly Gnrt Diml Points, Intriit Blnkin, Lin Zro Blnkin n Ovrlow Inition Disply O Mo Turns O Disply n Puts Chip Into Low Powr Mo Hol n Rst Inputs or Aitionl Flxiility Fturs ICMA n ICMB Funtions Also s Prio Countr, Unit Countr, Frquny Rtio Countr or Tim Intrvl Countr Cyl, 0 Cyls, 00 Cyls, 000 Cyls in Prio, Frquny Rtio n Tim Intrvl Mos Msurs Prio From 0.µs to 0s Fturs ICMD Diml Point n Lin Zro Bnkin My B Extrnlly Slt Orrin Inormtion PART NUMBER TEMPERATURE PACKAGE Th ICMA n ICMB r ully intrt Timr Countrs with LED isply rivrs. Thy omin hih rquny osilltor, tims ountr, n - t ountr n lths, -smnt or, iit multiplxrs n smnt n iit rivrs whih irtly riv lr multiplx LED isplys. Th ountr inputs hv mximum rquny o 0MHz in rquny n unit ountr mos n MHz in th othr mos. Both inputs r iitl inputs. In mny pplitions, mpliition n lvl shitin will rquir to otin propr iitl sinls or ths inputs. Th ICMA n ICMB n untion s rquny ountr, prio ountr, rquny rtio ( A / B ) ountr, tim intrvl ountr or s totlizin ountr. Th ountr uss ithr 0MHz or MHz qurtz rystl tims. For prio n tim intrvl, th 0MHz tims ivs 0.µs rsolution. In prio vr n tim intrvl vr, th rsolution n in th nnoson rn. In th rquny mo, th usr n slt umultion tims o 0.0s, 0.s, s n 0s. With 0s umultion tim, th rquny n isply to rsolution o 0.Hz in th lst siniint iit. Thr is 0.s twn msurmnts in ll rns. Th ICMD untions s rquny ountr only, s sri ov. All vrsions o th ICM inorport lin zro lnkin. Frquny is isply in khz. In th ICMA n ICMB, tim is isply in µs. Th isply is multiplx t 00Hz with.% uty yl or h iit. Th ICMA is sin or ommon no isplys with typil pk smnt urrnts o ma. Th ICMB n ICMD r sin or ommon tho isplys with typil pk smnt urrnts o ma. In th isply o mo, oth iit n smnt rivrs r turn o, nlin th isply to us or othr untions. ICMAlJl - o C to + o C L Crmi DIP ICMBlPl - o C to + o C L Plsti DIP ICMDlPl - o C to + o C L Plsti DIP CAUTION: Ths vis r snsitiv to ltrostti ishr. Usrs shoul ollow propr I.C. Hnlin Prours. Copyriht Hrris Corportion 99 - Fil Numr
Pinouts ICMA COMMON ANODE (CDIP) TOP VIEW ICMB COMMON CATHODE (PDIP) TOP VIEW CONTROL CONTROL HOLD HOLD FUNCTION DECIMAL POINT OUTPUT SEG OUTPUT SEG OUTPUT SEG OUTPUT OUTPUT EXT DIGIT OUTPUT DIGIT OUTPUT FUNCTION DIGIT OUTPUT DIGIT OUTPUT DIGIT OUTPUT DIGIT OUTPUT OUTPUT EXT DECIMAL POINT OUTPUT SEG OUTPUT V SS DIGIT OUTPUT V SS SEG OUTPUT SEG OUTPUT 9 0 DIGIT OUTPUT DIGIT OUTPUT 9 0 SEG OUTPUT SEG OUTPUT 0 9 DIGIT OUTPUT DIGIT OUTPUT 0 9 SEG OUTPUT SEG OUTPUT DIGIT OUTPUT SEG OUTPUT DIGIT OUTPUT DIGIT OUTPUT SEG OUTPUT RESET DIGIT OUTPUT RESET SEG OUTPUT DIGIT OUTPUT SEG OUTPUT ICMD COMMON CATHODE (PDIP) TOP VIEW CONTROL MEASUREMENT IN PROGRESS DIGIT OUTPUT DIGIT OUTPUT DIGIT OUTPUT DIGIT OUTPUT V SS DIGIT OUTPUT DIGIT OUTPUT 9 DIGIT OUTPUT 0 DIGIT OUTPUT RESET EX. DECIMAL POINT 0 9 HOLD OUTPUT EXT DECIMAL POINT OUTPUT SEG OUTPUT SEG OUTPUT SEG OUTPUT SEG OUTPUT SEG OUTPUT SEG OUTPUT SEG OUTPUT -
Funtionl Blok Dirm EXT OUTPUT SELECT REFERENCE COUNTER 0 DIGIT DECODER DRIVERS DIGIT OUTPUTS () 0 OR 0 00Hz SELECT LOGIC CONTROL LOGIC RESET STORE AND RESET LOGIC CONTROL LOGIC CONTROL (NOTE ) CONTROL LOGIC EN CL MAIN 0 COUNTER DATA LATCHES AND OUTPUT MUX OVERFLOW STORE LOGIC EXT (NOTE ) DECODER SEGMENT LOGIC DRIVER Q SEGMENT OUTPUTS () CONTROL LOGIC D CL MAIN FF MEASUREMENT IN PROGRESS OUTPUT (NOTE ) FUNCTION (NOTE ) FN CONTROL LOGIC HOLD NOTES:. Funtion input n input B vill on ICMA/B only.. Ext input n MEASUREMENT IN PROGRESS output vill on ICMD only. -
Asolut Mximum Rtins Spiitions Mximum Supply Volt ( - V SS ).....................V Mximum Diit Output Currnt........................ 00mA Mximum Smnt Output Currnt..................... 0mA Volt On Any Input or Output Trminl (Not )............ ( +0.V) to (V SS -0.V) Stor Tmprtur Rn................. - o C to +0 o C L Tmprtur (Solrin 0s).................... +00 o C Thrml Inormtion Thrml Rsistn θ JA θ JC Crmi DIP Pk............... o C/W 0 o C/W Plsti DIP Pk................ o C/W - Juntion Tmprtur Crmi Pks.............................. + o C Plsti Pks................................ +0 o C Oprtin Tmprtur Rn................. - o C to + o C CAUTION: Strsss ov thos list in Asolut Mximum Rtins my us prmnnt m to th vi. This is strss only rtin n oprtion o th vi t ths or ny othr onitions ov thos init in th oprtionl stions o this spiition is not impli. Eltril Spiitions =.0V, V SS = 0V, T A = + o C, Unlss Othrwis Spii PARAMETER TEST CONDITIONS MIN TYP MAX UNITS ICMA/B Oprtin Supply Currnt, I DD Disply O, Unus Inputs to V SS - ma Supply Volt Rn ( -V SS ), V SUPPLY, Frquny t MAX. -.0 V Mximum Frquny, Pin, A(MAX) Fiur 9, Funtion = Frquny, Rtio, Unit Countr 0 - - MHz Funtion = Prio, Tim Intrvl. - - MHz Mximum Frquny, Pin, B(MAX) Fiur 0. - - MHz Minimum Sprtion to Tim Intrvl Funtion Fiur 0 - - ns Mximum Osilltor Frquny n Extrnl Osilltor 0 - - MHz Frquny, Minimum Extrnl Osilltor Frquny, - - 00 khz Osilltor Trnsonutn, M =.V, T A = + o C 000 - - µs Multiplx Frquny, MUX = 0MHz - 00 - Hz Tim Btwn Msurmnts = 0MHz - 00 - ms Input Volts: Pins,,,, Input Low Volt, V INL - -.0 V Input Hih Volt, V lnh. - - V Input Rsistn to Pins,, R IN V IN = -.0V 00 00 - kω Input Lk Pin,,, I ILK - - 0 µa Input Rn o Chn, V ln /t Supplis Wll Bypss - - mv/µs ICMA Diit Drivr: Pins,,, 9, 0,,, Hih Output Currnt, I OH V OUT = -.0V -0-0 - ma Low Output Currnt, I OL V OUT = V SS +.0V - 0. - ma Smnt Drivr: Pins,,,, 9,0,, Low Output Currnt, I OL V OUT = V SS +.V 0 - ma Hih Output Currnt, I OH V OUT = -.V -00 - µa Multiplx Inputs: Pins,, Input Low Volt, V INL - - 0. V Input Hih Volt, V INH.0 - - V Input Rsistn to V SS,R IN V IN = V SS +.0V 0 00 - kω -
Spiitions Eltril Spiitions =.0V, V SS = 0V, T A = + o C, Unlss Othrwis Spii (Continu) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS ICMB Diit Drivr: Pins,,,, 9, 0,, Low Output Currnt, I OL V OUT = V SS +.V 0 - ma Hih Output Currnt, I OH V OUT = -.V - -00 - µa Smnt Drivr: Pins,,, 9, 0,,, Hih Output Currnt, I OH V OUT = -.0V -0 - - ma Lk Currnt, I SLK V OUT = -.V - - 0 µa Multiplx Inputs: Pins,, Input Low Volt, V INL - - -.0 V Input Hih Volt, V lnh -0. - - V Input Rsistn to,r IN V ln = -.V 00 0 - kω ICMD Oprtin Supply Currnt, I DD Disply O, Unus Inputs to V SS - ma Supply Volt Rn ( -V SS ), V SUPPLY Frquny t MAX. -.0 V Mximum Frquny, Pin, A(MAX) Fiur 9 0 - - MHz Mximum Osilltor Frquny n Extrnl Osilltor 0 - - MHz Frquny, Minimum Extrnl Osilltor Frquny, - - 00 khz Osilltor Trnsonutn, M =.V, T A = + o C 000 - - µs Multiplx Frquny, MUX = 0MHz - 00 - Hz Tim Btwn Msurmnts = 0MHz - 00 - ms Input Volts: Pins,, Input Low Volt, V INL - -.0 V Input Hih Volt, V INH. - - V Input Rsistn to Pins,, R IN V IN = -.0V 00 00 - kω Input Lk, Pins,, I ILK - - 0 µa Output Currnt, Pin, I OL V OL = +0.V 0. - - ma Output Currnt, Pin, I OH V OH = -0.V - - µa Input Rt o Chn, V ln /t Supplis Wll Bypss - - mv/µs Diit Drivr: Pins,,,,, 9, 0, Low Output Currnt, I OL V OUT = +.V 0 - ma Hih Output Currnt, I OH V OUT = -.V - 00 - µa Smnt Drivr: Pins,,, 9, 0,,, Hih Output Currnt, I OH V OUT = -.0V 0 ma Lk Currnt, I SLK V OUT = -.V - - 0 µa Multiplx Inputs: Pins,, Input Low Volt, V lnl - - -.0 V Input Hih Volt, V INH -0. - - V Input Rsistn to,r ln V IN = -.0V 00 0 - kω NOTE:. Th ICM my trir into strutiv lthup mo i ithr input sinls r ppli or th powr supply is ppli or i input or outputs r or to volts xin to V SS y mor thn 0.V. -
Timin Dirm INTERNAL STORE 0ms 0ms TO 0ms INTERNAL RESET 0ms FUNCTION: TIME INTERVAL 0ms UPDATE 90ms TO 00ms PRIMING MEASUREMENT INTERVAL UPDATE MEASUREMENT IN PROGRESS (INTERNAL ON A/B) PRIMING EDGES 0ns MIN MEASURED INTERVAL (FIRST) MEASURED INTERVAL (LAST) NOTE:. I rn is st to vnt, irst n lst msur intrvl will oini. FIGURE. WAVEFORMS FOR TIME INTERVAL MEASUREMENT (OTHERS ARE SIMILAR, BUT WITHOUT PRIMING PHASE) Typil Prormn Curvs 0 A (MAX) FREQUENCY UNIT COUNTER, FREQUENCY RATIO MODES 00..0V FREQUENCY (MHz) 0 A (MAX) B (MAX) PERIOD, TIME INTERVAL MODES I DIG (ma) 00 00 + o C + o C T A = + o C 0 -V SS (V) FIGURE. A (MAX), B (MAX) AS A FUNCTION OF SUPPLY -0 o C 0 0 -V OUT (V) FIGURE. ICMA TYPICAL I DIG vs -V OUT -
Typil Prormn Curvs (Continu) 0..0V -0 o C 0 T A = + o C =.V 0 + o C 0 =.0V I SEG (ma) + o C I SEG (ma) 0 =.V 0 0 0 0 -V OUT (V) 0 0 V OUT (V) FIGURE. ICMB & ICMD TYPICAL I SEG vs -V OUT FIGURE. ICMA TYPICAL I SEG vs V OUT 00 =.0V -0 o C 0 =.0V -0 o C 0 + o C 0 + o C I DIGIT (ma) 00 + o C I SEG (ma) 0 + o C 0 0 0 0 V OUT (V) 0 0 V OUT (V) FIGURE. ICMB & ICMD TYPICAL I DIGIT vs V OUT FIGURE. ICMA TYPICAL I SEG vs V OUT 00 T A = + o C =.V 0 =.0V =.V I DIGIT (ma) 00 0 0 0 V OUT (V) FIGURE. ICMB & ICMD TYPICAL I DIGIT vs V OUT -
Dsription S A n B S A n B r iitl inputs with typil swithin thrshol o.0v t =.0V. For optimum prormn th pk-to-pk input sinl shoul t lst 0% o th supply volt n ntr out th swithin volt. Whn ths inputs r in rivn rom TTL loi, it is sirl to us pullup rsistor. Th iruit ounts hih to low trnsitions t oth inputs. ( is vill only on lcma n lcmb). Not tht th mplitu o th input shoul not x th vi supply (ov th n low th V SS ) y mor thn 0.V, othrwis th vi my m. Multiplx Inputs Th FUNCTION,, CONTROL n EXTERNAL DECIMAL POINT inputs r tim multiplx to slt th untion sir. This is hiv y onntin th pproprit Diit rivr output to th inputs. Th untion, rn n ontrol inputs must stl urin th lst hl o h iit output, (typilly µs). Th multiplx inputs r tiv hih or th ommon no lcma n tiv low or th ommon tho lcmb n lcmd. Nois on th multiplx inputs n us impropr oprtion. This is prtiulrly tru whn th unit ountr mo o oprtion is slt, sin hns in volt on th iit rivrs n pitivly oupl throuh th LED ios to th multiplx inputs. For mximum nois immunity, 0kΩ rsistor shoul pl in sris with th multiplx inputs s shown in th pplition iruits. Tl shows th untions slt y h iit or ths inputs. TABLE. MULTIPLEXED FUNCTIONS FUNCTION DIGIT FUNCTION (Pin Frquny D, lcma n B Prio D Only) Frquny Rtio D Tim Intrvl D Unit Countr D Osilltor Frquny D, Pin 0.0s/ Cyl D 0.s/0 Cyls D s/00 Cyls D 0s/K Cyls D CONTROL, Pin Extrnl (Pin, ICMD Only) Disply O Disply Tst MHz Slt Extrnl Osilltor Enl Extrnl Diml Point Enl D n Hol D D D D Diml point is output or sm iit tht is onnt to this input..v 0.V FIGURE 9. WAVEFORM FOR GUARANTEED MINIMUM A (MAX) FUNCTION = FREQUENCY, FREQUENCY RATIO, UNIT COUNTER OR.V 0.V FIGURE 0. WAVEFORM FOR GUARANTEED MINIMUM B (MAX) AND A (MAX) FOR FUNCTION = PERIOD AND TIME INTERVAL Funtion Input 0ns MIN 0ns MIN MEASURED INTERVAL 0ns MIN COUNTED TRANSITIONS 0ns MIN t R = t F = 0ns t R = t F = 0s Th six untions tht n slt r: Frquny, Prio, Tim Intrvl, Unit Countr, Frquny Rtio n Osilltor Frquny. This input is vill on th lcma n lcmb only. Th implmnttion o irnt untions is on y routin th irnt sinls to two ountrs, ll Min Countr n Rrn Countr. A simplii lok irm o th vi or untions rliztion is shown in Fiur. Tl shows whih sinls will rout to h ountr in irnt ss. Th output o th Min Countr is th inormtion whih os to th isply. Th Rrn Countr ivis its input y, 0, 00 n 000. On o ths outputs will slt throuh th rn sltor n riv th nl input o th Min Countr. This mns tht th Rrn Countr, lon with its' ssoit loks, irts th Min Countr to in ountin n trmins th lnth o th ountin prio. Not tht Fiur os not show th omplt untionl irm (S th Funtionl Blok Dirm). Atr th n o h ountin prio, th output o th Min Countr will lth n isply, thn th ountr will rst n nw msurmnt yl will in. Any hn in th FUNCTION will stop th prsnt msurmnt without uptin th isply n thn initit nw msurmnt. This prvnts n rronous irst rin tr th FUNCTION is hn. In ll ss, th -0 trnsitions r ount or tim. -9
INTERNAL CONTROL INTERNAL CONTROL 00Hz SELECTOR CLOCK REFERENCE COUNTER 0 00 000 INTERNAL CONTROL INTERNAL CONTROL SELECTOR INTERNAL OR EXTERNAL ILLATOR SELECTOR ENABLE CLOCK MAIN COUNTER FIGURE. SIMPLIFIED BLOCK DIAGRAM OF FUNCTIONS IMPLEMENTATION TABLE. A/B ROUTING FUNCTION MAIN COUNTER REFERENCE COUNTER Frquny ( A ) Input A 00Hz (Osilltor 0 or 0 ) Prio (t A ) Osilltor Input A Rtio ( A / B ) Input A Input B Tim Intrvl (A B) Unit Countr (Count A) Os. Frq. ( ) Osilltor Input A Input A Input B Not Applil Osilltor 00Hz (Osilltor 0 or 0 ) Frquny - In this mo input A is ount y th Min Countr or pris prio o tim. This tim is trmin y th tim s osilltor n th slt rn. For th 0MHz (or MHz) tim s, th rsolutions r 00Hz, 0Hz, Hz n 0.Hz. Th iml point on th isply is st or khz rin. Prio - In this mo, th tims osilltor is ount y th Min Countr or th urtion o,0,00 or 000 (rn slt) prios o th sinl t input A. A 0MHz tims ivs rsolutions o 0.µs to 0.000µs or 000 prios vrin. Not tht th mximum input rquny or prio msurmnt is.mhz. Frquny Rtio - In this mo, th input A is ount y th Min Countr or th urtion o,0,00 or 000 (rn slt) prios o th sinl t input B. Th rquny t input A shoul hihr thn input B or mninul rsult. Th rsult in this s is unitlss n its rsolution n o up to iits tr iml point. Tim Intrvl - In this mo, th tims osilltor is ount y th Min Countr or th urtion o -0 trnsition o input A until -0 trnsition o input B. This mns input A strts th ountin n input B stops it. I othr rns, xpt 0.0s/ yl r slt th squn o input A n B trnsitions must hppn 0,00 or 000 tims until th isply oms upt; not this whn msur- in lon tim intrvls to iv nouh tim or msurmnt ompltion. Th rsolution in this mo is th sm s or prio msurmnt. S th Tim Intrvl Msurmnt stion lso. Unit Countr - In this mo, th Min Countr is lwys nl. Th input A is ount y th Min Countr n isply ontinuously. Osilltor Frquny - In this mo, th vi mks rquny msurmnt on its tims. This is sl tst mo or vi untionlity hk. For 0MHz tims th isply will show 0000.0, 0000.00, 0000.000 n Ovrlow in irnt rns. Rn Input Th slts whthr th msurmnt prio is m or,0,00 or 000 ounts o th Rrn Countr. As it is shown in Tl, this ivs irnt ountin winows or rquny msurmnt n vrious yls or othr mos o msurmnt. In ll untionl mos xpt Unit Countr, ny hn in th will stop th prsnt msurmnt without uptin th isply n thn initit nw msurmnt. This prvnts n rronous irst rin tr th is hn. Control Input Unlik th othr multiplx inputs, to whih only on o th iit outputs n onnt t tim, this input n ti to irnt iit lins to slt omintion o ontrols. In this s, isoltion ios must us in iit lins to voi rosstlk twn thm (s Fiur ). Th irtion o ios pns on th vi vrsion, ommon no or ommon tho. For mximum nois immunity t this input, in ition to th 0K rsistor whih ws mntion or, 9pF to 00pF pitor shoul lso pl twn this input n th or V SS (S Fiur ). Disply O - To isl th isply rivrs, it is nssry to ti th D lin to th CONTROL n hv th HOLD input t. Whil in Disply O mo, th smnts n -0
iit rivrs r ll o, lvin th isply lins lotin, so th isply n shr with othr vis. In this mo, th osilltor ontinus to run with typil supply urrnt o.ma with 0MHz rystl, ut no msurmnts r m n multiplx inputs r intiv. A nw msurmnt yl will initit whn th HOLD input is swith to V SS. Disply Tst - Disply will turn on with ll th iits showin s n ll iml points on. Th isply will lnk i Disply O is slt t th sm tim. MHz Slt - Th MHz slt mo llows us o MHz rystl with th sm iit multiplx rt n tim twn msurmnt s with 0MHz rystl. This is on y iviin th osilltor rquny y 0 rthr thn 0. Th iml point is lso shit on iit to th riht in prio n tim intrvl, sin th lst siniint iit will in µs inrmnt rthr thn 0.µs inrmnt. Extrnl Osilltor Enl - In this mo, th sinl t EXT is us s tims inst o th on-or rystl osilltor (uilt roun th, OUT- PUT inputs). This input n us or n xtrnl stl tmprtur ompnst rystl osilltor or or spil msurmnts with ny xtrnl sour. Th on-or rystl osilltor ontinus to work whn th xtrnl osilltor is slt. This is nssry to voi hn-up prolms, n hs no t on th hip's untionl oprtion. I th onor osilltor rquny is lss thn MHz or only th xtrnl osilltor is us, THE MUST BE CONNECTED TO THE EXT proviin th tims hs nouh volt swin or (S Eltril Spiitions). I th xtrnl tims is TTL lvl pullup rsistor must us or. Th othr wy is to put MΩ rsistor twn n OUTPUT n pitivly oupl th EXT to. This will is th t its thrshol n th riv volt will n to only V P-P. Th xtrnl tims rquny must rtr thn 00kHz or th hip will rst itsl to nl th on-or osilltor. Extrnl Diml Point Enl - In this mo, th EX is nl (lcmd only). A iml point will isply or th iit tht its output lin is onnt to this input (EX ). Diit shoul not us sin it will ovrri th ovrlow output. Lin zro lnkin is tiv or th iits to th lt o slt iml point. Hol Input Expt in th unit ountr mo, whn th HOLD input is t, ny msurmnt in prorss (or STORE os low) is stopp, th min ountr is rst n th hip is hl ry to initit nw msurmnt s soon s HOLD os low. Th lths whih hol th min ountr t r not upt, so th lst omplt msurmnt is isply. In unit ountr mo whn HOLD input is t, th ountr is not stopp or rst, ut th isply is rozn t tht instntnous vlu. Whn HOLD os low th ount ontinus rom th nw vlu in th nw ountr. RESET Input Th RESET input rsts th min ountr, stops ny msurmnt in prorss, n nls th min ountr lths, rsultin in n ll zro output. A pitor to roun will prvnt ny hn-ups on powr-up. MEASUREMENT IN PROGRESS This output is provi in lcmd. It stys low urin msurmnts n os hih or intrvls twn msurmnts. It is provi or systm intrin n n riv low powr Shottky TTL or on ECL lo i th ECL vi is powr rom th sm supply s lcmd. Diml Point Position Tl shows th iml point position or irnt mos o lcm oprtion. Not tht th iit is th lst siniint iit. Tl is or 0MHz tims rquny. Ovrlow Inition Whn ovrlow hppns in ny msurmnt it will init on th iml point o th iit. A sprt LED initor n us. Fiur shows how to onnt this initor. FIGURE. SEGMENT IDENTIFICATION AND DISPLAY FONT Ovrlow will init on th iml point output o iit. A sprt LED ovrlow initor n onnt s ollows: DEVICE CATHODE ANODE ICMA Diml Point D ICMB/D D Diml Point TABLE. DECIMAL POINT POSITIONS FREQUENCY PERIOD FREQUENCY RATIO TIME INTERVAL UNIT COUNTER ILLATOR FREQUENCY 0.0s/ Cyl D D D D D D 0.s/0 Cyl D D D D D D s/00 Cyl D D D D D D 0s/K Cyl D D D D D D -
Tim Intrvl Msurmnt Whn in th tim intrvl mo n msurin sinl vnt, th lcma n lcmb must irst prim prior to msurin th vnt o intrst. This is on y irst nrtin ntiv oin on Chnnl A ollow y ntiv oin on Chnnl B to strt th msurmnt intrvl. Th inputs r thn prim ry or th msurmnt. Positiv oin s on A n B, or or tr th primin, will n to rstor th oriinl onition. Primin n sily omplish usin th iruit in Fiur. SIGNAL A SIGNAL B C O = Crystl Stti Cpitn R S = Crystl Sris Rsistn C IN = Input Cpitn C OUT = Output Cpitn ω = π Th rquir M shoul not x 0% o th M spii or th lcm to insur rlil strtup. Th illtor n OUTPUT pins h ontriut out pf to C IN n C OUT. For mximum stility o rquny, C IN n C OUT shoul pproximtly twi th spii rystl stti pitn. In ss whr non prslrs r us it my sirl to us rystl whih is nithr 0MHz or MHz. In tht s oth th multiplx rt n tim twn msurmnts will irnt. Th multiplx rt is N.O. PRIME N9 00K 0K 0K 0.µF 0nF = MUX or 0MHz mo n or 0 = MUX 0 th MHz mo. Th tim twn msurmnts is 0 0 in th 0MHz mo n in th MHz mo. V SS V SS V SS DEVICE TYPE CD09B Invrtin Bur CD00B Exlusiv - OR FIGURE. PRIMING CIRCUIT, SIGNALS A & B BOTH HIGH OR LOW Followin th primin prour (whn in sinl vnt or yl rn) th vi is ry to msur on (only) vnt. Whn timin rptitiv sinls, it is not nssry to prim th lcma n lcmb s th irst ltrntin sinl stts utomtilly prim th vi. S Fiur. Durin ny tim intrvl msurmnt yl, th ICMA n lcmb rquir 00ms ollowin B oin low to upt ll intrnl loi. A nw msurmnt yl will not tk pl until ompltion o this intrnl upt tim. Osilltor Consirtions Th osilltor is hih in CMOS invrtr. An xtrnl rsistor o 0MΩ to MΩ shoul onnt twn th illtor n OUTPUT to provi isin. Th osilltor is sin to work with prlll rsonnt 0MHz qurtz rystl with stti pitn o pf n sris rsistn o lss thn Ω. For spii rystl n lo pitn, th rquir M n lult s ollows: M ω C O = C C R + IN OUT S C L C C IN OUT whrc = L C + C IN OUT Th rystl n osilltor omponnts shoul lot s los to th hip s prtil to minimiz pikup rom othr sinls. Couplin rom th EXTERNAL lllator to th lllator OUTPUT or n us unsirl shits in osilltor rquny. Disply Consirtions Th isply is multiplx t 00Hz rt with iit tim o µs. An intriit lnkin tim o µs is us to prvnt isply hostin (int isply o t rom prvious iit suprimpos on th nxt iit). Lin zro lnkin is provi, whih lnks th lt hn zros tr iml point or ny non zro iits. Diits to th riht o th iml point r lwys isply. Th lin zro lnkin will isl whn th Min Countr ovrlows. Th lcma is sin to riv ommon no LED isplys t pk urrnt o ma/smnt, usin isplys with V F =.V t ma. Th vr DC urrnt will ovr ma unr ths onitions. Th lcmb n lcmd r sin to riv ommon tho isplys t pk urrnt o ma/smnt usin isplys with V F =.V t ma. Rsistors n in sris with th smnt rivrs to limit th isply urrnt in vry iint isplys, i rquir. Th Typil Prormn Curvs show th iit n smnt urrnts s untion o output volt. To t itionl rihtnss out o th isplys, my inrs up to.0v. Howvr, r shoul tkn to s tht mximum powr n urrnt rtins r not x. Th smnt n iit outputs in lcm's r not irtly omptil with ithr TTL or CMOS loi whn rivin LEDs. Thror, lvl shitin with isrt trnsistors my rquir to us ths outputs s loi sinls. -
Aury In Univrsl Countr rystl rit n quntiztion ts us rrors. In rquny, prio n tim intrvl mos, sinl riv rom th osilltor is us in ithr th Rrn Countr or Min Countr. Thror, in ths mos n rror in th osilltor rquny will us n intil rror in th msurmnt. For instn, n osilltor tmprtur oiint o 0 PPM / o C will us msurmnt rror o 0 PPM / o C. In ition, thr is quntiztion rror inhrnt in ny iitl msurmnt o ± ount. Clrly this rror is ru y isplyin mor iits. In th rquny mo th mximum ury is otin with hih rquny inputs n in prio mo mximum ury is otin with low rquny inputs (s n sn in Fiur ). In tim intrvl msurmnts thr n n rror o ount pr intrvl. As rsult thr is th sm inhrnt ury in ll rns s shown in Fiur. In rquny rtio msurmnt n mor urtly otin y vrin ovr mor yls o s shown in Fiur. 0 FREQUENCY MEASURE 0 MAXIMUM NUMBER OF SIGNIFICANT DIGITS 0.0s 0.s s 0s CYCLE 0 CYCLES 0 CYCLES 0 CYCLES PERIOD MEASURE = 0MHz 0 0 0 0 FREQUENCY (Hz) MAXIMUM NUMBER OF SIGNIFICANT DIGITS MAXIMUM TIME INTERVAL FOR 0 INTERVALS 0 0 MAXIMUM TIME INTERVAL FOR 0 INTERVALS MAXIMUM TIME INTERVAL FOR 0 INTERVALS 0 0 0 0 0 0 TIME INTERVAL (µs) FIGURE. MAXIMUM ACCURACY OF FREQUENCY AND PERIOD MEASUREMENTS DUE TO LIMITATIONS OF QUANTIZATION ERRORS FIGURE. MAXIMUM ACCURACY OF TIME INTERVAL MEASUREMENT DUE TO LIMITATIONS OF QUANTIZATION ERRORS MAXIMUM NUMBER OF SIGNIFICANT DIGITS 0 CYCLE 0 CYCLES 0 CYCLES 0 CYCLES 0 0 0 0 0 0 0 0 A / B FIGURE. MAXIMUM ACCURACY FOR FREQUENCY RATIO MEASUREMENT DUE TO LIMITATION OF QUANTIZATION ERRORS -
Tst Ciruit FUNCTION GENERATOR DISPLAY BLANK DISPLAY TEST MHz EXT TEST F P FR TI. U.C. O.F. FUNCTION GENERATOR FUNCTION 0K D D D D D D RESET 9 0 ICMA 00pF 0 9 HOLD D D D D D D D D.0/./0 /00 0/K LED OVERFLOW INDICATOR D D D D D D D D D 0kΩ 0kΩ 0kΩ MΩ 9pF 0MHz CRYSTAL D D D D 9pF TYP D D D D D EXT TYPICAL CRYSTAL SPECS: F = 0MHz PARALLEL RESONANCE C L = pf R S = <Ω N9 s FIGURE. TEST CIRCUIT (ICMA SHOWN, OTHERS SIMILAR) Typil Applitions Th lcm hs n sin or us in wi rn o Univrsl n Frquny ountrs. In mny ss, prslrs will rquir to ru th input rqunis to unr 0MHz. Bus n r iitl inputs, itionl iruitry is otn rquir or input urin, mpliition, hystrsis, n lvl shitin to otin oo iitl sinl. Th lcma or lcmb n us s minimum omponnt omplt Univrsl Countr s shown in Fiur. This iruit n us input rqunis up to 0MHz t n MHz t. I th sinl t hs vry low uty yl it my nssry to us LS monostl multivirtor or similr iruit to strth th input puls with to l to urnt tht it is t lst 0ns in urtion. To msur rqunis up to 0MHz th iruit o Fiur 9 n us. To otin th orrt msur vlu, it is nssry to ivi th osilltor rquny y our s wll s th input rquny. In oin this th tim twn msurmnts is lso lnthn to 00ms n th isply multiplx rt is rs to Hz. I th input rquny is prsl y tn, thn th osilltor n rmin t 0MHz or MHz, ut th iml point must mov on iit to th riht. Fiur 0 shows rquny ountr with 0 prslr n n lcma. Sin thr is no xtrnl iml point ontrol with th lcma n lcmb, th iml point my ontroll xtrnlly with itionl rivrs s shown in Fiur 0. Altrntivly, i sprt nos r vill or th iml points, thy n wir up to th jnt iit nos. Not tht thr n on zro to th lt o th iml point sin th intrnl lin zro lnkin nnot hn. In Fiur itionl loi hs n to ount th input irtly in prio mo or mximum ury. In Fiurs 0 n, oms rom Q C o th prslr rthr thn Q D to otin n input uty yl o 0%. -
0kΩ DISPLAY BLANK DISPLAY TEST EXT ENABLE HOLD 00pF 9pF TYP CONTROL SWITCHES F P F.R. T.I. U.C. O.F. 0kΩ D D D D D D FUNCTION 0.µF RESET D D D D D D D D 9 0 ICMB 0 9 00kΩ 0kΩ MΩ D D D D 0MHz CRYSTAL 9pF SEGMENT DRIVERS IN9 S SEC CYCLES D 0.0.0 D 0. 0.0 D.0 00.0 D 0.0 K D D D EXT COMMON CATHODE LED DISPLAY DIGIT DRIVERS D D D D D D D D D LED OVERFLOW INDICATOR FIGURE. 0MHz UNIVERSAL COUNTER -
J CL K P / LS Q Q C V+ K CL J 0 / LS P Q Q 9 C kω EXT ENABLE DISPLAY OFF DISPLAY TEST 0kΩ HOLD 9pF 9pF 00pF 00kΩ 0.µF D D D D D D D 9 0 ICMD 0 9 MΩ.MHz CRYSTAL D D D IN9 S EXT RESET LED OVERFLOW INDICATOR D D 0kΩ COMMON CATHODE LED DISPLAY D D D D D D D D D D D D OVERFLOW INDICATOR FIGURE 9. 0MHz FREQUENCY COUNTER -
DISPLAY TEST CK CK QA QC LS90 OR C90 F P F.R. kω 0.µF RESET 0kΩ CK CK D D D QA OC C90 9 0 00pF ICMA kω 0 9 0kΩ D D D D D D D D LED OVERFLOW INDICATOR D D D D D D D D D HOLD COMMON CATHODE LED DISPLAY 0kΩ 0kΩ D D D D MΩ 9pF 0MHz CRYSTAL D D D D 0pF TYP N9 D kω kω N V SS 0Ω FIGURE 0. 00MHz MULTIFUNCTION COUNTER -
C90 CK CK QA OC LS00 kω kω 0kΩ 00pF HOLD 0kΩ 00kΩ 9pF 9pF TYP N 0kΩ 0kΩ FUNCTION SWITCH OPEN: FREQ. CLOSED: PERIOD 0kΩ RESET 0.µF CONT CD0 CONT D D LED OVERFLOW INDICATOR V + 9 0 ICMA 0 9 0kΩ D D D D D D D D COMMON CATHODE LED DISPLAY D D D D MΩ 0MHz CRYSTAL D D D D D D D D D D D D D N kω D V SS kω N kω V SS 0Ω FIGURE. 00MHz FREQUENCY, MHz PERIOD COUNTER -