Dual 4Bit Decade CountersEach of these monolithic circuits contains eight masterslave FlipFlops and additional gating to implement two individual fourbit Counters in a single package. The '390 and 'LS390 incorporate dual dividebytwo and dividebyfive Counters which CAN be used to implement cycle lengths equal to any whole and/or cumulative multiples of 2 and/or 5 up to divideby100. When connected as a biquinary Counter the separate dividebytwo circuit CAN be used to provide symmetry (a square wave) at the final output stage. The '393 and 'LS393 each comprise two independent fourbit binary Counters each having a clear and a Clock input. Nbit binary Counters CAN be implemented with each package providing the capability of divideby256. The '390, 'LS390, '393, and 'LS393 have parallel outputs from each Counter stage so that any submultiple of the input count frequency is available for systemtiming signals. Series 54 and Series 54LS circuits are characterized for operation over the full military temperature range of 55C to 125C; Series 74 and Series 74LS circuits are characterized for operation from 0C to 70C.
By Texas Instruments 
Part  Manufacturer  Description  Datasheet  Samples  

SN74LS390DE4  Texas Instruments  Dual 4Bit Decade Counters 16SOIC 0 to 70  
SN74LS390NSRG4  Texas Instruments  LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 3BIT UP DECADE COUNTER, PDSO16, GREEN, PLASTIC, SOP16  
SN74LS390D  Texas Instruments  Dual 4Bit Decade Counters 16SOIC 0 to 70  
SN74LS390NSRE4  Texas Instruments  LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 3BIT UP DECADE COUNTER, PDSO16, GREEN, PLASTIC, SOP16  
SN74LS390DRG4  Texas Instruments  LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 3BIT UP DECADE COUNTER, PDSO16, GREEN, PLASTIC, MS012AC, SOIC16  
SN74LS390N  Texas Instruments  Dual 4Bit Decade Counters 16PDIP 0 to 70  
SN74LS390N3  Texas Instruments  Dual 4Bit Decade Counters 16PDIP 0 to 70  
SN74LS390NSR  Texas Instruments  Dual 4Bit Decade Counters 16SO 0 to 70  
SN74LS390NE4  Texas Instruments  Dual 4Bit Decade Counters 16PDIP 0 to 70  
SN74LS390DG4  Texas Instruments  Dual 4Bit Decade Counters 16SOIC 0 to 70 

SN74LS390 PbFree  SN74LS390 Cross Reference  SN74LS390 Schematic  SN74LS390 Distributor 
SN74LS390 Application Notes  SN74LS390 RoHS  SN74LS390 Circuits  SN74LS390 footprint 