ICM7226A ICM7226B 8-Digit Multi-Function Frequency Counter/Timers

Transcription

1 Dmr 99 SEMICONDUCTOR ICMA ICMB -Diit Multi-Funtion Frquny Countr/Timrs Fturs CMOS Dsin or Vry Low Powr Output Drivrs Dirtly Driv Both Diits n Smnts o Lr Diit LED Displys Msurs Frqunis rom DC to 0MHz; Prios rom 0.µs to 0s Stl Hih Frquny Osilltor uss ithr MHz or 0MHz Crystl Both Common Ano n Common Ctho Avill Control Sinls Avill or Extrnl Systms Intrin Multiplx BCD Outputs Applitions Frquny Countr Prio Countr Unit Countr Frquny Rtio Countr Tim Intrvl Countr Orrin Inormtion PART NUMBER TEMPERATURE RANGE PACKAGE ICMAlJL - o C to + o C 0 L Crmi DIP ICMBlPL - o C to + o C 0 L Plsti DIP Dsription Th ICM is ully intrt Univrsl Countr n LED isply rivr. It omins hih rquny osilltor, tims ountr, n - t ountr n lths, -smnt or, iit multiplxr n smnt n iit rivrs whih n irtly riv lr LED isplys. Th ountr inputs pt 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 ICM n untion s rquny ountr, prio ountr, rquny rtio ( A / B ) ountr, tim intrvl ountr or s totlizin ountr. Th vis rquir ithr 0MHz or MHz qurtz rystl tims, or i sir n xtrnl tims n lso us. 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. Thr is 0.s twn msurmnts in ll rns. Control sinls r provi to nl tin n storin o prslr t. Lin zro lnkin hs n inorport with rquny isply in khz n tim in µs. Th isply is multiplx t 00Hz rt with.% uty yl or h iit. Th ICMA is sin or ommon no isplys with typil pk smnt urrnts o ma, n th ICMB is sin or ommon tho isplys with typil smnt urrnts o ma. In th isply o mo, oth iit rivrs n smnt rivrs r turn o, llowin th isply to us or othr untions. CAUTION: Ths vis r snsitiv to ltrostti ishr. Usrs shoul ollow propr I.C. Hnlin Prours. Copyriht Hrris Corportion 99 - Fil Numr 9

2 Pinouts ICMA COMMON ANODE (CDIP) TOP VIEW CONTROL B MEASUREMENT IN PROGRESS STORE BCD BCD SEG SEG SEG V SS SEG SEG SEG SEG BCD BCD RST EXT IN A 9 HOLD BUF OSC OUT NC (NOTE ) OSC OUT OSC IN NC (NOTE ) EXT OSC IN RST OUT EXT RANGE 0 D 9 D D D D D D D RANGE ICMB COMMON CATHODE (PDIP) TOP VIEW CONTROL B MEASUREMENT IN PROGRESS STORE BCD BCD D D D D V SS D D D D BCD BCD RST EXT IN A 9 HOLD BUF OSC OUT NC (NOTE ) OSC OUT OSC IN NC (NOTE ) EXT OSC IN RST OUT EXT RANGE 0 OUT 9 SEG SEG SEG SEG SEG SEG SEG RANGE NOTE:. For mximum rquny stility, onnt to or V SS -

3 Funtionl Blok Dirm EXT OSC OSC OSC OUTPUT BUF OSC OUTPUT RESET OSC SELECT DECODER DIGIT DRIVERS REFERENCE COUNTER +0 RANGE CONTROL LOGIC STORE 0 RANGE OR 00Hz EXT RANGE AND RESET SELECT 0 LOGIC LOGIC CONTROL LOGIC DIGIT OUTPUTS () RANGE CONTROL A B CONTROL LOGIC MAIN RESET EN COUNTER CL 0 OVERFLOW LOGIC EXT DATA LATCHES OUTPUT MUX STORE CONTROL LOGIC D CL MAIN FF DECODER SEGMENT & LZB DRIVERS LOGIC SEGMENT OUTPUTS () R FN CONTROL LOGIC BCD OUTPUTS () MEAS IN PROGRESS OUTPUT HOLD RESET OUTPUT STORE OUTPUT -

4 Asolut Mximum Rtins Mximum Supply Volt ( - V SS ) V Mximum Diit Output Currnt mA Mximum Smnt Output Currnt mA 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) o C Spiitions Thrml Inormtion Thrml Rsistn θ JA θ JC Crmi DIP Pk o C/W o C/W Plsti DIP Pk o C/W - Juntion Tmprtur Crmi DIP Pk o C Plsti DIP Pk 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, T A = + o C, Unlss Othrwis Spii PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Oprtin Supply Currnt, I DD Disply O, Unus Inputs to V SS - ma Supply Volt Rn ( -V SS ), V SUPPLY - o C < T A < + o C, A, B Frquny t MAX. -.0 V Mximum Frquny A, Pin 0, A(MAX) Mximum Frquny B, Pin, B(MAX) Minimum Sprtion A to B, Tim Intrvl Funtion Osilltor Frquny n Extrnl Osilltor Frquny, OSC - o C < T A < + o C.V < <.0V, Fiur 9 Funtion = Frquny, Rtio, Unit Countr 0 - MHz Funtion = Prio, Tim Intrvl. - - MHz - o C < T A < + o C.V < <.0V, Fiur 0 - o C < T A < + o C.V < <.0V, Fiur - o C < T A < + o C.V < <.0V. - - MHz ns MHz Osilltor Trnsonutn, M -.V, T A = + o C µs Multiplx Frquny, MUX OSC = 0MHz Hz Tim Btwn Msurmnts OSC = 0MHz ms Input Rt o Chr, V IN /t Inputs A, B - - mv/µs Input Volts: Pins, 9,, 9, 0, Input Low Volt, V IL - o C < T A < + o C V Input Hih Volt, V lh. - - V Pins, 9, 0, Input Lk, A, B, I ILK µa Input Rsistn to Pins 9,, R IN V IN = -.0V kω Input Rsistn to V SS Pin, R IN V IN = +.0V kω Output Currnt Low Output Currnt, Pins, -,,,,, I OL V OL = +0.V µa Hih Output Currnt, Pins -,,,, H OL V OH = +.V µa Hih Output Currnt, Pins,, H OL V OH = -0.V - - µa ICMA Smnt Drivr: Pins -, - Low Output Currnt, I OL V O = +.V - ma Hih Output Currnt, I OH V O = -.0V µa Multiplx Inputs: Pins,, 0, Input Low Volt, V IL V Input Hih Volt, V IH V Input Rsistn to V SS,R IN V IN = +.0V kω -

5 Spiitions Eltril Spiitions =.0V, T A = + o C, Unlss Othrwis Spii (Continu) Diit Drivr: Pins -, -0 Low Output Currnt, I OL V O = +.0V ma Hih Output Currnt, I OH V O = -.0V ma ICMB Smnt Drivr: Pins -, -0 Lk Currnt, I L V O = V SS µa Hih Output Currnt, I OH V O = -.0V 0 - ma Multiplx Inputs: Pins,, 0, Input Low Volt, V IL V Input Hih Volt, V IH V Input Rsistn to V SS,R IN V IN = -.0V kω Diit Drivr: Pins -, - PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Low Output Currnt, I OL V O = +.0V 0 - ma Hih Output Currnt, I OH V O = -.V µa NOTES:. Dstrutiv lthup my our i input sinls r ppli or th powr supply is stlish or i inputs or outputs r or to volts xin or V SS y 0.V.. Assums ll ls solr or wl to PC or n r ir low.. Typil vlus r not tst. Timin Wvorm STORE 0ms 0ms TO 0ms RESET 0ms : TIME INTERVAL 0ms UPDATE 90ms TO 00ms PRIMING MEASUREMENT INTERVAL UPDATE MEASUREMENT IN PROGRESS A PRIMING EDGES B 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) -

6 Typil Prormn Curvs 00 T A = + o C =.V 00..0V 0 =.0V =.V 00 I DIGIT (ma) 00 0 I DIG (ma) 00 + o C + o C -0 o C 0 0 V OUT (V) FIGURE. ICMB TYPICAL I DIGIT vs V OUT 0 0 -V OUT (V) FIGURE. ICMA TYPICAL I DIG vs -V OUT 0..0V -0 o C 0 T A = + o C =.V I SEG (ma) 0 + o C + o C I SEG (ma) 0 0 =.0V =.V V OUT (V) 0 0 V OUT (V) FIGURE. ICMB 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 V OUT (V) 0 0 V OUT (V) FIGURE. ICMB TYPICAL I DIGIT vs V OUT FIGURE. ICMA TYPICAL I SEG vs V OUT -9

7 Typil Prormn Curvs (Continu) 0 A (MAX) FREUENCY UNIT COUNTER, FREUENCY RATIO MODES FREUENCY (MHz) 0 A (MAX) B (MAX) PERIOD TIME INTERVAL MODES T A = + o C 0 -V SS (V) FIGURE. A (MAX), B (MAX) AS A OF SUPPLY Dsription S A n B Th sinl to msur is ppli to A in rquny prio, unit ountr, rquny rtio n tim intrvl mos. Th othr input sinl to msur is ppli to B in rquny rtio n tim intrvl. A shoul hihr thn B urin rquny rtio. COUNTED TRANSITIONS Both inputs r iitl inputs with typil swithin thrshol o.0v t =.0V n input impn o 0kΩ. 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 A.V 0.V 0ns MIN 0ns MIN t R = t F = 0ns 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 FIGURE 9. WAVEFORM FOR GUARANTEED MINIMUM A (MAX) = FREUENCY, FREUENCY RATIO, UNIT COUNTER A OR B.V 0.V 0ns MIN MEASURED INTERVAL 0ns MIN t R = t F = 0s FIGURE 0. WAVEFORM FOR GUARANTEED MINIMUM B (MAX) AND A (MAX) FOR = PERIOD AND TIME INTERVAL Th, RANGE, 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. 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. -0

8 Tl shows th untions slt y h iit or ths inputs. TABLE. MULTIPLEXED S Pin RANGE Pin CONTROL Pin Extrnl Pin 0 Funtion Input Frquny Prio Frquny Rtio Tim Intrvl Unit Countr Osilltor Frquny DIGIT D D D D D D 0.0s/ Cyl D 0.s/0 Cyls D s/00 Cyls D 0s/K Cyls D Enl Extrnl Rn Input D Disply O Disply Tst MHz Slt Extrnl Osilltor Enl Extrnl Diml Point Enl D n Hol D D D Th six untions tht n slt r: Frquny, Prio, Tim Intrvl, Unit Countr, Frquny Rtio n Osilltor Frquny. D Diml point is output or sm iit tht is onnt to this input. 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 to, 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 will stop th prsnt msurmnt without uptin th isply n thn initit nw msurmnt. This prvnts n rronous irst rin tr th is hn. In ll ss, th -0 trnsitions r ount or tim. TABLE. ROUTING MAIN COUNTER 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. ( OSC ) Osilltor Input A Input A Input B Not Applil Osilltor 00Hz (Osilltor 0 or 0 ) INTERNAL CONTROL INTERNAL CONTROL 00Hz A B SELECTOR CLOCK REFERENCE COUNTER INTERNAL CONTROL INTERNAL CONTROL RANGE SELECTOR INTERNAL OR EXTERNAL OSCILLATOR A SELECTOR ENABLE CLOCK MAIN COUNTER FIGURE. SIMPLIFIED BLOCK DIAGRAM OF S IMPLEMENTATION -

9 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 msurin 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 , , n Ovrlow in irnt rns. Rn Input Th RANGE slts whthr th msurmnt prio is m or,0,00 or 000 ounts o th Rrn Countr or it is ontroll y EXT RANGE input. 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 RANGE will stop th prsnt msurmnt without uptin th isply n thn initit nw msurmnt. This prvnts n rronous irst rin tr th RANGE 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 9). 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 9). 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 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 lso 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 OSC is us s tims inst o th on-or rystl osilltor (uilt roun th OSC, OSC OUTPUT 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 on-or osilltor rquny is lss thn MHz or only th xtrnl osilltor is us, THE OSC MUST BE CONNECTED TO THE EXT OSC proviin th tims hs nouh volt swin or OSC (S Eltril Spiitions). I th xtrnl tims is TTL lvl pullup rsistor must us or OSC. Th othr wy is to put MΩ rsistor twn OSC n OSC OUTPUT n pitivly oupl th EXT OSC to OSC. This will is th OSC 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. 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. -

10 RST IN Input Th RST IN is provi to rst th Min Countr, stop ny msurmnt in prorss, n nl th isply lths, rsultin in th ll zro isply. It is sust to hv pitor t this input to V SS to prvnt ny hnup prolm on powr up. S pplition iruits. EXT RANGE Input MEAS IN PROGRESS STORE RESET OUT 0ms TO 0ms 90ms TO 00ms 0ms 0ms 0ms This input is provi to slt rns othr thn thos provi in th hip. In ny mo o msurmnt th urtion o msurmnt is trmin y th EXT RANGE i this input is nl. This input is smpl t 0ms intrvls y th 00Hz rrn riv rom th tims. Fiur shows th rltionship twn this input, 00Hz rrn sinl n MEAS IN PROGRESS. EXT RANGE n hn stt nywhr urin th prio o 00Hz rrn y will smpl t th trilin o th prio to strt or stop msurmnt. REFERENCE COUNTER CLOCK MEAS IN PROGRESS EXT RANGE T R FIGURE. EXTERNAL RANGE TO END OF MEASURE- MENT IN PROGRESS This input shoul not us or short ritrry rns (us o its smplin prio), it is provi or vry lon tin purposs. A wy o usin th ICM or short ritrry rn is to th tin sinl into th B n run th vi in th Frquny Rtio mo. Not tht th tin prio will rom on positiv until th nxt positiv o B (0.0 s/ yl rn). MEAS IN PROGRESS, STORE, RST OUT Outputs Ths outputs r provi or xtrnl systm intrin. MEAS IN PROGRESS stys low urin msurmnts n os hih or intrvls twn msurmnts. Fiur shows th rltionship twn ths outputs or intrvls twn msurmnts. All ths outputs n riv low powr Shottky TTL. Th MEAS IN PROGRESS n riv on ECL lo i th ECL vi is powr rom th sm powr supply s th ICM. FIGURE. RESET OUT, STORE AND MEASUREMENT IN PROGRESS OUTPUTS BETWEEN MEASUREMENTS BCD Outputs Th BCD rprsnttion o h isply iit is vill t th BCD outputs in multiplx shion. S Tl or iits truth tl. Th BCD output o h iit is vill whn its orrsponin iit output is tivt. Not tht th iit outputs r multiplx rom D (MSD) to D (LSD). Th positiv oin (ICMA, ommon no) or th ntiv oin (ICMB, ommon tho) iit riv sinls l th BCD t y µs to µs. This strtin o h iit riv sinl shoul us to xtrnlly lth th BCD t. Eh BCD output rivs on low powr Shottky TTL lo. Lin zro lnkin hs no t on th BCD outputs. TABLE. TRUTH TABLE BCD OUTPUTS NUMBER BCD PIN BCD PIN BCD PIN BCD PIN BUF OSC OUT Output Th BUFFr OSCilltor OUTput is provi or us o th on-or osilltor sinl, without loin th osilltor itsl. This output n riv on low powr Shottky TTL lo. Cr shoul tkn to minimiz pitiv loin on this pin. 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 ivn or 0MHz tims rquny. TABLE. DECIMAL POINT POSITIONS RANGE FREUENCY PERIOD FREUENCY RATIO TIME INTERVAL UNIT COUNTER OSCILLATOR FREUENCY 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 Extrnl N/A N/A N/A N/A N/A N/A -

11 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. LED ovrlow initor onntions: Ovrlow ill init on th iml point output o iit. DEVICE CATHODE ANODE ICMA Diml Point D ICMB D Diml Point FIGURE. SEGMENT IDENTIFICATION AND FONT 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 A B 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 rquirs 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 omplmntry FET invrtr. An xtrnl rsistor o 0MΩ or MΩ shoul onnt twn th osilltor input 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. Amon suitl rystls is th 0MHz CTS KNIGHTS ISI-00 For spii rystl n lo pitn, th rquir M n lult s ollows: M ω C O = C IN C OUT R S + C L whrc L = C IN C OUT C IN + C OUT 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 OSCilltor 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 OSC OSC MUX = or 0MHz mo n or th 0 MUX = 0 0 MHz mo. Th tim twn msurmnts is in OSC 0 th 0MHz mo n in th MHz mo. OSC 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. Th ur osilltor output shoul us s n osilltor tst point or to riv itionl loi; this output will riv on low powr Shottky TTL lo. Whn th ur osilltor output is us to riv CMOS or th xtrnl osilltor input, 0kΩ rsistor shoul rom th ur osilltor output to. Th rystl n osilltor omponnts shoul lot s los to th hip s prtil to minimiz pikup rom othr sinls. Couplin rom th EXTERNAL OSClLLATOR to th OSClLLATOR OUTPUT or n us unsirl shits in osilltor rquny. -

12 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 rtr thn ma unr ths onitions. Th lcmb is 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, i rquir. Th Typil Prormn Curvs show th iit n smnt urrnts s untion o output volt or ommon no n ommon tho rivrs. To inrs th liht output rom th isplys, my inrs to.0v. Howvr, r shoul tkn to s tht mximum powr n urrnt rtins r not x. Th SEGmnt n Diit outputs in oth th ICMA n ICMB r not irtly omptil with ithr TTL or CMOS loi. Thror, lvl shitin with isrt trnsistors my rquir to us ths outputs s loi sinls. Extrnl lthin shoul own on th lin o th iit sinl. Aury In Univrsl Countr, rystl rit n quntiztion rrors us rrors. In rquny, prio n tim intrvl mos, sinl riv rom th osilltor is us in ithr th Rrn Countr or Min Countr, n in ths mos, n rror in th osilltor rquny will us n intil rror in th msurmnt. For instn, n osilltor tmprtur oiint o 0ppm/ o C will us msurmnt rror o 0ppm/ 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 mximum ury is otin with hih rquny inputs n in prio mo mximum ury is otin with low rquny inputs. As 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 B s shown in Fiur. MAXIMUM NUMBER OF SIGNIFICANT DIGITS 0 0.0s 0.s s 0s CYCLE 0 CYCLES 0 0 CYCLES CYCLES FREUENCY MEASURE PERIOD MEASURE OSC = 0MHz FREUENCY (Hz) FIGURE. MAXIMUM ACCURACY OF FREUENCY AND PERIOD MEASUREMENTS DUE TO LIMITATIONS OF UANTIZATION ERRORS MAXIMUM NUMBER OF SIGNIFICANT DIGITS 0 MAXIMUM TIME INTERVAL FOR 0 INTERVALS 0 MAXIMUM TIME INTERVAL FOR 0 INTERVALS MAXIMUM TIME INTERVAL FOR 0 INTERVALS TIME INTERVAL (µs) FIGURE. MAXIMUM ACCURACY OF TIME INTERVAL MEASUREMENT DUE TO LIMITATIONS OF UANTIZATION ERRORS MAXIMUM NUMBER OF SIGNIFICANT DIGITS 0 RANGE CYCLE 0 CYCLES 0 CYCLES 0 CYCLES A / B FIGURE. MAXIMUM ACCURACY FOR FREUENCY RATIO MEASUREMENT DUE TO LIMITATION OF UANTIZATION ERRORS -

13 Tst Ciruit =.0V OFF TEST MHz EXT OSC EXT TEST GENERATOR GENERATOR B MEAS IN PROGRESS 0K D D D D D D RESET STORE BCD C BCD D BCD B BCD A 9pF A CONTROL ICMA EXT OSC IN V SS 0kΩ HOLD BUF OSC OUT RST OUT EXT RANGE D D D D D D D D GENERATOR 00kΩ 00kΩ 0pF MΩ 0MHz CRYSTAL D D 9pF D D D D D D D D D D D D N9s CRYSTAL SPECS. = F O 0.00MHz C O pf R S Ω DENOTES BU WITH CONDUCTORS D D D LED OVERFLOW D INDICATOR D D D D D D D D D D LED OVERFLOW INDICATOR CONNECTIONS DEVICE CATHODE ANODE ICMA D ICMB D NOTE: Ovrlow will init on th iml point output o iit. FIGURE 9. -

14 Typil Applitions Th ICM hs n sin s omplt stn lon Univrsl Countr, or us with prslrs n othr iruitry in vrity o pplitions. Sin A n B r iitl inputs, itionl iruitry will rquir in mny pplitions, or input urin, mpliition, hystrsis, n lvl shitin to otin th rquir iitl volts. For mny pplitions FET sour ollowr n us or input urin, n n ECL 0 lin rivr n us or mpliition n hystrsis to otin hih impn input, snsitivity n nwith. Howvr, ost n omplxity o this iruitry n vry wily, pnin upon th snsitivity n nwith rquir. Whn TTL prslrs or input urs r us, pull up rsistors to shoul us to otin optiml volt swin t S A n B. I prslrs rn t rquir, th ICM n us to implmnt minimum omponnt Univrsl Countr s shown in Fiur 0. For input rqunis up to 0MHz, th iruit shown in Fiur n us to implmnt rquny n prio ountr. To otin th orrt vlu whn msurin rquny n prio, it is nssry to ivi th 0MHz osilltor rquny own to.mhz. In oin this th tim twn msurmnts is lnthn to 00ms n th isply multiplx rt is rs to Hz. I th input rquny is prsl y tn, th osilltor rquny n rmin t ithr 0MHz or MHz, ut th iml point must mov. Fiur shows us o 0 prslr in rquny ountr mo. Aitionl loi hs n to nl th ICM to ount th input irtly in prio mo or mximum ury. 0kΩ BLANK TEST EXT OSC ENABLE 9pF A IN B IN kΩ HOLD D N9s D D 0kΩ V+ D D D D D D RESET 0.µF D D D D D D D ICMB 0 9 V+ EXT OSC IN 00kΩ 9pF V+ D MΩ D D V+ 0MHz CRYSTAL 9pF TYP TYPICAL CRYSTAL PARAMETERS C L pf R S Ω D D D D D D D D D D FIGURE 0. 0MHz UNIVERSAL COUNTER -

15 P D P D CK C C CK A IN EXT OSC ENABLE B IN D OFF D D D TEST V+ P C P C N9 D V+ V+ V+ LS kω V+ 0kΩ 0kΩ D D D D D D D D 0. µf 9pF RESET ICMB kω HOLD 00kΩ 9pF 00kΩ LS MΩ D D D D 0MHz CRYSTAL 9pF TYP P D IC CK C P D IC CK C kω D D D P F R D D D D D D D D D OVERFLOW FIGURE. 0MHz FREUENCY, PERIOD COUNTER -

16 M CP ECLC90 TTL CE MS LS00 0kΩ OFF TEST EXT OSC EN MHz 9pF V+ 0kΩ V+ 0kΩ LS00 V+ 0kΩ M CP ECLC90 TTL CE MS D F D P D R D UC 0kΩ 9 0 ICMA D D D HOLD D 00kΩ EXT OSC IN 9pF D N9s MΩ D 0MHz CRYSTAL 9pF TYP D D 0 kω D D S 9 0 D D D RANGE D D D D D 0.µF 00kΩ OVERFLOW D D D D D D D D D FIGURE. 00MHz MULTI- COUNTER -9

17 M CP ECLC90 TTL CE MS 9pF 0kΩ OFF TEST 0kΩ N kω D D D 0kΩ SWITCH OPEN FRE CLOSED PERIOD F D IN CONT CD0 D IN CONT OUT OUT 0kΩ D D D D D D D 9 0 ICMB kΩ HOLD 9pF N9s MΩ 0MHz CRYSTAL 9pF TYP 0.µF N.O. RESET D 9 0 0kΩ D D D D D D D D D D D D D OVERFLOW FIGURE. 00MHz FREUENCY, PERIOD COUNTER -0

18 Fiur shows th us o CD0 nlo multiplxr to multiplx th iitl outputs k to th Input. Sin th CD0 is iitlly ontroll nlo trnsmission t, no lvl shitin o th iit output is rquir. CD0 s or CD0 s oul lso us to slt th propr inputs or th multiplx input on th ICM rom or it iitl inputs. Ths nlo multiplxrs my lso us in systms in whih th mo o oprtion is ontroll y miroprossor rthr thn irtly rom ront pnl swiths. TTL multiplxrs suh s th LS or LS my lso us, ut som itionl iruitry will rquir to onvrt th iit output to TTL omptil loi lvls. Th iruit shown in Fiur n us in ny o th iruit pplitions shown to implmnt sinl msurmnt mo o oprtion. This iruit uss th STORE output to put th ICM into hol mo. Th HOLD input n lso us to ru th tim twn msurmnts. Th iruit shown in Fiur puts short puls into th HOLD input short tim tr STORE os low. A nw msurmnt will initit t th n o th puls on th HOLD input. This iruit rus th tim twn msurmnts to out 0ms rom 00ms; us o th iruit shown in Fiur on th iruit shown in Fiur will ru th tim twn msurmnts rom 00ms to out 0ms. Usin LCD Disply Fiur shows th ICM in intr to LCD isplys, y usin its BCD outputs n iit lins to riv two ICM isply rivrs. STORE OUTPUT S 00kΩ S 00kΩ HOLD SWITCH S 00kΩ STORE OUTPUT 00kΩ 00pF 00pF 00kΩ HOLD S S Opn-Sinl Ms Mo Enl Clos-Initit Nw Msurmnt HOLD SWITCH N.O. S Clos-Hol Input FIGURE. SINGLE MEASUREMENT CIRCUIT FOR USE WITH ICM FIGURE. CIRCUIT FOR REDUCING TIME BETWEEN MEA- SUREMENTS +V SEGMENT LINES SEGMENT LINES +V ICM ICM D D D D ICMA FIGURE. 0MHz UNIVERSAL COUNTER SYSTEM WITH LCD -