HD74LS390 Datasheet, PDF (1/6 Pages) Hitachi Semiconductor – Dual Decade Counters

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 bi-
quinary 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
P
(DP-16FV)
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 2
1QA
Output
3
1B 4
1QB 5
Outputs 1QC ⁶
1QD 7
GND 8
CLR
1QA
1A
1B
1QB
1QC
1QD
CLR
2QA
2A
2B
2QB
2QC
2QD
16 V_CC
15 _2A
14 _2Clear
13
2QA
Output
12 _2B
11 _2QB
10 _{2QC Outputs}
9 2QD
(Top view)
Rev.4.00, May 10, 2006, page 1 of 5