Dual Decade Counters
HD74LS390
Dual Decade Counters
REJ03D0485-0400 Rev.4.00
May 10, 2006
This circuit contains eight master-slave flip-fl...
Description
HD74LS390
Dual Decade Counters
REJ03D0485-0400 Rev.4.00
May 10, 2006
This circuit contains eight master-slave flip-flops and additional gating to implement two individual four-bit counters. The HD74LS390 incorporates dual divide-by-two and divide-by-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 biquinary counter, the separate divide-by-two circuit can be used to provide symmetry (a square wave) at the final output stage.
Features
Ordering Information
Part Name
Package Type
Package Code (Previous Code)
Package Abbreviation
HD74LS390P
DILP-16 pin
PRDP0016AE-B (DP-16FV)
P
HD74LS390FPEL SOP-16 pin (JEITA)
PRSP0016DH-B (FP-16DAV)
FP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation (Quantity) —
EL (2,000 pcs/reel)
Pin Arrangement
1A 1
1Clear
1QA Output
1B
2 3 4
1QB 5
Outputs 1QC 6
1QD 7
GND 8
CLR 1...
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