DM74LS293 4-Bit Binary Counter

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DM74LS293 4-Bit Binary Counter

DM74LS293 4-Bit Binary CounterGeneral DescriptionThe ’LS293 counter is electrically and functionally identicalto the ’LS93 Only the arrangement of the terminals hasbeen changed for the ’LS293Each of these monolithic counters contains four masterslaveflip-flops and additional gating to provide a divide-bytwocounter and a three-stage binary counter for which thecount cycle length is divide-by-eightAll of these counters have a gated zero resetConnection DiagramJune 1989To use the maximum count length (four-bit binary) of thesecounters the B input is connected to the Q A output Theinput count pulses are applied to input A and the outputs areas described in the appropriate function tableFeaturesY GND and VCC on Corner Pins (Pins 7 and 14respectively)Y Typical power dissipation 45 mWY Count frequency 42 MHzDM74LS293 4-Bit Binary CounterDual-In-Line PackageOrder Number DM74LS293M or DM74LS293NSee NS Package Number M14A or N14ATLF6423–1C1995 National Semiconductor CorporationTLF6423RRD-B30M105Printed in U S A


Absolute Maximum Ratings (Note)If MilitaryAerospace specified devices are requiredplease contact the National Semiconductor SalesOfficeDistributors for availability and specificationsSupply VoltageInput VoltageOperating Free Air Temperature RangeDM74LSStorage Temperature Range7V7V0Ctoa70Cb65Ctoa150CRecommended Operating ConditionsSymbolParameterNote The ‘‘Absolute Maximum Ratings’’ are those valuesbeyond which the safety of the device cannot be guaranteedThe device should not be operated at these limits Theparametric values defined in the ‘‘Electrical Characteristics’’table are not guaranteed at the absolute maximum ratingsThe ‘‘Recommended Operating Conditions’’ table will definethe conditions for actual device operationDM74LS293Min Nom MaxV CC Supply Voltage 475 5 525 VV IH High Level Input Voltage 2 VV IL Low Level Input Voltage 08 VI OH High Level Output Current b04 mAI OL Low Level Output Current 8 mAf CLK Clock Frequency A to Q A 0 32(Note 1)BtoQ B 0 16f CLK Clock Frequency A to Q A 0 20(Note 2)BtoQ B 0 10t W Pulse Width A 15(Note 6)B 30 nsReset 15t REL Reset Release Time (Note 6) 25 nsT A Free Air Operating Temperature 0 70 CElectrical Characteristics over recommended operating free air temperature range (unless otherwise noted)Symbol Parameter Conditions MinTyp(Note 3)V I Input Clamp Voltage V CC e Min I I eb18 mA b15 VV OH High Level Output V CC e Min I OH e MaxVoltageV IL e Max V IH e MinV OL Low Level Output V CC e Min I OL e MaxVoltageV IL e Max V IH e MinMaxUnitsMHzMHzUnits27 34 V035 05 VI OL e 4 mA V CC e Min 025 04I I Input Current Max V CC e Max Reset 01Input VoltageV I e 7VA 02 mAI IH High Level Input V CC e Max Reset 20CurrentV I e 27VA 40 mAB02B 40I IL Low Level Input V CC e Max Reset b04CurrentV I e 04VA b24 mAI OS Short Circuit V CC e MaxOutput Current (Note 4)Bb16b20 b100 mAI CC Supply Current V CC e Max (Note 5) 9 15 mA2


Switching Characteristics at V CC e 5V and T A e 25C (See Section 1 for Test Waveforms and Output Load)From (Input)R L e 2kXSymbolParameterTo (Output)C L e 15 pF C L e 50 pF UnitsMin Max Min Maxt MAX Maximum Clock A to Q A 32 20FrequencyBtoQ B 16 10MHzt PLH Propagation Delay TimeLow to High Level OutputAtoQ A 16 23 nst PHL Propagation Delay TimeHigh to Low Level OutputAtoQ A 18 30 nst PLH Propagation Delay TimeLow to High Level OutputAtoQ D 70 87 nst PHL Propagation Delay TimeHigh to Low Level OutputAtoQ D 70 93 nst PLH Propagation Delay TimeLow to High Level OutputBtoQ B 16 23 nst PHL Propagation Delay TimeHigh to Low Level OutputBtoQ B 21 35 nst PLH Propagation Delay TimeLow to High Level OutputBtoQ C 32 48 nst PHL Propagation Delay TimeHigh to Low Level OutputBtoQ C 35 53 nst PLH Propagation Delay TimeLow to High Level OutputBtoQ D 51 71 nst PHL Propagation Delay TimeHigh to Low Level OutputBtoQ D 51 71 nst PHL Propagation Delay Time SET-0 toHigh to Low Level Output Any Q40 53 nsNote 1 C L e 15 pF R L e 2kXT A e25C and V CC e 5VNote 2 C L e 50 pF R L e 2kXT A e25C and V CC e 5VNote 3 All typicals are at V CC e 5V T A e 25CNote 4 Not more than one output should be shorted at a time and the duration should not exceed one secondNote 5 I CC is measured with all outputs open both RO inputs grounded following momentary connection to 45V and all other inputs groundedNote 6 T A e 25C and V CC e 5V3


Function TablesCountCount Sequence (See Note C)OutputsQ D Q C Q B Q A0 L L L L1 L L L H2 L L H L3 L L H H4 L H L L5 L H L H6 L H H L7 L H H H8 H L L L9 H L L H10 H L H L11 H L H H12 H H L L13 H H L H14 H H H L15 H H H HReset InputsResetCount Truth TableOutputsR0(1) R0(2) Q D Q C Q B Q AH H L L L LL X COUNTX L COUNTH e High Level L e Low Level X e Don’t CareNote C Output Q A is connected to input BLogic DiagramLS293TLF6423–2Note The J and K inputs shown without connection are for reference only and are functionally at a high level4


Physical Dimensions inches (millimeters)14-Lead Small Outline Molded Package (M)Order Number DM74LS293MNS Package Number M14A5


DM74LS293 4-Bit Binary CounterPhysical Dimensions inches (millimeters) (Continued)14-Lead Molded Dual-In-Line Package (N)Order Number DM74LS293NNS Package Number N14ALIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORTDEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONALSEMICONDUCTOR CORPORATION As used herein1 Life support devices or systems are devices or 2 A critical component is any component of a lifesystems which (a) are intended for surgical implant support device or system whose failure to perform caninto the body or (b) support or sustain life and whose be reasonably expected to cause the failure of the lifefailure to perform when properly used in accordance support device or system or to affect its safety orwith instructions for use provided in the labeling can effectivenessbe reasonably expected to result in a significant injuryto the userNational Semiconductor National Semiconductor National Semiconductor National SemiconductorCorporation Europe Hong Kong Ltd Japan Ltd1111 West Bardin Road Fax (a49) 0-180-530 85 86 13th Floor Straight Block Tel 81-043-299-2309Arlington TX 76017 Email cnjwge tevm2nsccom Ocean Centre 5 Canton Rd Fax 81-043-299-2408Tel 1(800) 272-9959 Deutsch Tel (a49) 0-180-530 85 85 Tsimshatsui KowloonFax 1(800) 737-7018 English Tel (a49) 0-180-532 78 32 Hong KongFranais Tel (a49) 0-180-532 93 58 Tel (852) 2737-1600Italiano Tel (a49) 0-180-534 16 80 Fax (852) 2736-9960National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications

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