NSC DM54ALS390 Dual 4-bit decade counter Datasheet

April 1987
DM54ALS390/DM74ALS390 Dual 4-Bit Decade Counters
General Description
Features
Each of these monolithic counters contains eight masterslave flip-flops and additional gating to implement two independent four bit counters in a single package.
To use their maximum count length, the B input is connected 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 obtained by connecting the QD output to the A input and applying the input count to the B input.
Y
Connection Diagram
Function Tables
Y
Y
Y
Y
Switching specifications at 50 pF
Switching specifications guaranteed over full temperature and VCC range
Advanced oxide-isolated, ion-implanted Schottky TTL
process
Individual clocks for A and B flip-flops provide dual divide-by-2 and divide-by-5 counters
Direct clear for each 4-bit counter
BCD Count Sequence
(See Note 2)
Output
Count
TL/F/9169 – 1
Order Number DM54ALS390J, DM74ALS390M or
DM74ALS390N
See NS Package Number J16A, M16A or N16A
QD
QC
QB
0
L
L
L
QA
L
1
L
L
L
H
2
L
L
H
L
3
L
L
H
H
4
L
H
L
L
5
L
H
L
H
6
L
H
H
L
7
L
H
H
H
8
H
L
L
L
9
H
L
L
H
QB
Bi-Quinary (5-2)
(See Note 3)
Output
Count
QA
QD
QC
0
L
L
L
L
1
L
L
L
H
2
L
L
H
L
3
L
L
H
H
4
L
H
L
L
5
H
L
L
L
6
H
L
L
H
7
H
L
H
L
8
H
L
H
H
9
H
H
L
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.
DM54ALS390/DM74ALS390 Dual 4-Bit Decade Counters
PRELIMINARY
Absolute Maximum Rating
Note: The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation.
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
b 55§ C to a 125§ C
DM54ALS
DM74ALS
0§ C to a 70§ C
Storage Temperature Range
b 65§ C to a 150§ C
Recommended Operating Conditions
Symbol
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
IOH
High Level Output Current
IOL
Low Level Output Current
fCOUNT
Count Frequency
tW
DM54ALS390
Parameter
Pulse Width
DM74ALS390
Units
Min
Nom
Max
Min
Nom
Max
4.5
5
5.5
4.5
5
5.5
2
2
V
V
0.7
0.8
V
b 0.4
b 0.4
mA
8
mA
4
A Input
0
0
B Input
0
0
MHz
A Input High
A Input Low
ns
B Input High
Clear High
tSU
Clear Inactive-State Setup Time
TA
Free Air Operating Temperature
ns
b 55
125
0
70
§C
Electrical Characteristics over recommended free air temperature range
Symbol
VIC
Parameter
Test Conditions
Input Clamp Voltage
VCC e Min, II e b18 mA
VOH
High Level Output Voltage
VCC e 4.5V to 5.5V, IOH e b0.4 mA
VOL
Low Level Output
Voltage
VCC e Min
II
IIH
IIL
Input Current at Max, VI e 7V
Input Voltage
VCC e Max, VI e 7V
High Level Input
Current
VCC e Max, VI e 2.7V
Low Level Input
Current
VCC e Max, VI e 0.4V
IO
Output Drive Current
(B Bus Ports Only)
VCC e Max, VO e 2.25V
ICC
Supply Current
VCC e Max (Note 1)
2
Min
Typ
Max
Units
b 1.5
V
VCC b 2
V
54/74ALS
IOL e 4 mA
0.25
74ALS
IOL e 8 mA
0.35
0.4
V
0.5
Clear
100
Input A
200
Input B
300
Clear
20
Input A
40
Input B
60
Clear
b 100
Input A
b 200
Input B
b 300
b 30
b 112
mA
mA
mA
mA
mA
Switching Characteristics over recommended operating free air temperature range
Symbol
fmax
Parameter
Maximum Clock Frequency
tPLH
Propagation Delay Time
Low to High Level Output
tPHL
Conditions
From (Input)
To (Output)
VCC e 4.5 to 5.5V,
RL e 500,X
CL e 50 pF
TA e Min to Max
(Note 2)
DM54ALS390
DM74ALS390
Min
Min
Max
Units
Max
A to QA
MHz
B to QB
A to QA
ns
Propagation Delay Time
High to Low Level Output
A to QA
ns
tPLH
Propagation Delay Time
Low to High Level Output
A to QC
ns
tPHL
Propagation Delay Time
High to Low Level Output
A to QC
ns
tPLH
Propagation Delay Time
Low to High Level Output
B to QB
ns
tPHL
Propagation Delay Time
High to Low Level Output
B to QB
ns
tPLH
Propagation Delay Time
Low to High Level Output
B to QC
ns
tPHL
Propagation Delay Time
High to Low Level Output
B to QC
ns
tPLH
Propagation Delay Time
Low to High Level Output
B to QD
ns
tPHL
Propagation Delay Time
High to Low Level Output
B to QD
ns
tPHL
Propagation Delay Time
High to Low Level Output
Clear to
Any Q
ns
Note 1: ICC is measured with all outputs open, both clear inputs grounded following momentary connection to 4.5V and all other inputs grounded.
Note 2: See Section 5 for test waveforms and output load.
3
Logic Diagram
TL/F/9169 – 2
4
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
DM54ALS390/DM74ALS390 Dual 4-Bit Decade Counters
Physical Dimensions inches (millimeters) (Continued)
Molded Dual-In-Line Package (N)
Order Number DM74ALS390N
NS Package Number N16A
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