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PDF DM74ALS390 Data sheet ( Hoja de datos )
| Número de pieza | DM74ALS390 | |
| Descripción | Dual 4-Bit Decade Counters | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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PRELIMINARY
April 1987
DM54ALS390 DM74ALS390 Dual 4-Bit Decade Counters
General Description
Each of these monolithic counters contains eight master-
slave flip-flops and additional gating to implement two inde-
pendent four bit counters in a single package
To use their maximum count length the B input is connect-
ed to the QA output The input count pulses are applied to
input A and the outputs are as described in the appropriate
truth table A symmetrical divide-by-ten count can be ob-
tained by connecting the QD output to the A input and ap-
plying the input count to the B input
Features
Y Switching specifications at 50 pF
Y Switching specifications guaranteed over full tempera-
ture and VCC range
Y Advanced oxide-isolated ion-implanted Schottky TTL
process
Y Individual clocks for A and B flip-flops provide dual di-
vide-by-2 and divide-by-5 counters
Y Direct clear for each 4-bit counter
Connection Diagram
TL F 9169 – 1
Order Number DM54ALS390J DM74ALS390M or
DM74ALS390N
See NS Package Number J16A M16A or N16A
Function Tables
BCD Count Sequence
(See Note 2)
Count
Output
QD QC QB
0 LLL
1 LLL
2 LLH
3 LLH
4 LHL
5 LHL
6 LHH
7 LHH
8 HLL
9 HLL
QA
L
H
L
H
L
H
L
H
L
H
Bi-Quinary (5-2)
(See Note 3)
Count
Output
QA QD QC QB
0 LLLL
1 LLLH
2 LLHL
3 L LHH
4 LHLL
5 HLLL
6 HLLH
7 HLHL
8 HLHH
9 HHL L
Note 2 Output QA is connected to input B for BCD count
Note 3 Output QD is connected to input A for bi-quinary count
H e High Logic Level L e Low Logic Level
This document contains information on a product under development NSC reserves the right to change or discontinue this product without notice
C1995 National Semiconductor Corporation TL F 9169
RRD-B30M105 Printed in U S A
Free Datasheet http://www.datasheet4u.net/
1 page  
Physical Dimensions inches (millimeters)
Ceramic Dual-In-Line Package (J)
Order Number DM54ALS390J
NS Package Number J16A
S O Package (M)
Order Number DM74ALS390M
NS Package Number M16A
5
Free Datasheet http://www.datasheet4u.net/
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet DM74ALS390.PDF ] | |
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