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DM74LS390

Part Number	DM74LS390
Manufacturer	Fairchild Semiconductor
Description	Dual 4-Bit Decade Counter
Published	Nov 18, 2005
Detailed Description	DM74LS390 Dual 4-Bit Decade Counter August 1986 Revised March 2000 DM74LS390 Dual 4-Bit Decade Counter General Descrip...
Datasheet	DM74LS390 PDF File

Overview

DM74LS390 Dual 4-Bit Decade Counter August 1986 Revised March 2000 DM74LS390 Dual 4-Bit Decade Counter General Description Each of these monolithic circuits contains eight masterslave flip-flops and additional gating to implement two individual four-bit counters in a single package.
The DM74LS390 incorporates dual divide-by-two and divideby-five counters, which can be used to implement cycle lengths equal to any whole and/or cumulative multiples of 2 and/or 5 up to divide-by-100.
When connected as a bi-quinary counter, the separate divide-by-two circuit can be used to provide symmetry (a square wave) at the final output stage.
The DM74LS390 has parallel outputs from each counter stage so t...

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