TC372 ETC | Alldatasheet
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580 Pleasant Street LABS Counters
Watertown, MA 02172 e Decade (617) 924-9280 . © Hexadecimal EE Features General Descriptions @ DIRECT PRESET OR RESET TO ZERO The 371 is a master-slave decade counter that generates BCD @ TWO CLOCK LINES FACILITATE INPUT ENABLE outputs. It also provides two clock inputs to facilitate input @ NINTH COUNT (371) AND 15TH COUNT (372) OUTPUTS enable control, direct set and reset inputs, and a ninth count FOR CASCADING output (carry output) so 371 cascades can generate counts of . 109, 1,000, and so forth. Its outputs are ideal as inputs to the © 1MHz TYPICAL TOGGLE RATE 380, 381, or 382 BCD to decimal decoders. The 372 master-slave counter generates 4-bit binary outputs from 0 to 15 in the standard 1-2-4-8 binary code. It also provides two clock inputs to facilitate input enable control, direct set and reset inputs, and a 15th count output (carry Output) to allow cascading to N binary stages. Logic Diagrams 371 191, 372 tv o aN @ rae q 3 $ aa, _ 21 1s) So, & |S a. w ToS) LF Re o “ —=- >i pie =F ay HT, Pac= C8 coe" He DLE SED LF a 2 : © a f ry GRO-8 § 0 GRO -8 i>“ Veo 16 ¢ Veo-16 © 0 Equivalent Circuits TYPICAL INPUT TYPICAL OUTPUT Voc ‘e INPUT | Rin PT An CP CP2 | SKM TYP. RESET | 20KQ. TYP. ALL SETS | 20K TYP. ourrur 3-67
Counters 371, 372 Truth Tables 371 372 oye oF [efor] ec[ oe] co ] [S35 [o [ou] a] 09] co a oto,opto,o 3 ete; otoyo 1 o}olo;o ° 1 o]o Oo} o oO o|s}o}ojeo] o ao |sfelojo| o 1 }afolo|o|] o 1 |ijojolo] o o fols}o]o| 5 ojolrjojo| o 1 }olr{elol} o r+ }eolrlolo| o ofsfafolo] o eo |s}afolo|} o t+ ]rlipolo; e + }afrfofol] . olofolr}o] o oe fofojs;o} o sHRREES P1slstrisl s o |rfo}rjo} o oj ito ifs 0 r}sleolalol] o 1 {rfojrfo|] o t folr}a}o} o PHARULE| ° vfarftrio o |} ° ’ yp ats ° rfrjrt ato] e rfafafrpo] o o }olojoljs| o o fofololo| o t fofojoli| o 1 |ojojols} o o{s}olojr] 3 of} sfola}ts| o tirfejotr| + S| sfoyolry o s fofrfola] o ofsiijolr: o + fas +[ 0 ojolols}ry; o 1 |ojols ‘| ° o{sfoli|a| o rfrlofafil oe a yetrtip ry e rfpolalapal o ofrtafatay ys te tatrtrtod 3 Specifications [simae@isv.samaeiev | Note: Icc is tested at Voc + 1 Volt (+13V for C type and +16V 'oc (WORST-CASE) 41 mA © 13V, 63 mA @ 16V for A twee) and Is guarsnteed across the spplicable tenip range, wih vou ino in Sunt ae jith the output loaded with 5 unit loads. 1/0 FUNCTION FOR R+a- | C- -0- “ ie ee LES See page 12 for electrical summary data. TYPICAL TOGGLE RATE IS 1 MHz Switching Time Waveforms cxoee eT u h =| econ ' \\ ! ~f- cour f coun. ' i oe-os fe Loading Table [ PINS _|_FUNCTION LOADING cP Clock inputs 2UL R Direct reset input 1UL s Direct set input TUL co Carry output 2UL Qa Outputs SUL
Counters 371, 372 Typical Performance Characteristics werut CURRENT OUTPUT CURRENT VS OUTPUT VULTAGE nai VS. INPUT VOLTAGE OUTPUT HIGH ourTPuT LOW ee "es . mee Seine ae rl (SPS VEE gee ARES | | Lea | CSS oH wt ee <4} RS : aBE en ee A SU eee 39-08 we aN of {Lee Ee =n Dig = aa Ee won ee om Typical Applications ‘The 371 counts as the clock goes from high to low. Setting or resetting must be done only with the clock line low (either Clock), To set, OF to reset the device to zero, the desired set or reset line is switched nigh. The court operation is inhibited by grounding either clock input, allowing one clock input to be an enable contro’. All unused disect set and reset pins should be grounded. Except for ta different internal gating, to provide hexadecimal counting, the operation of the 372 is the same as the operation of the 371. COUNTER MODES 371 -——f) as Ba 7) 2 ah | Le Yor Yee ——d ee —- ‘ee - = ce we 2 , i " ‘S “ ry a wwe i z ate - oO i‘ EA “es “ ” we Yor ra Ves 3-69