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DM5490/DM7490A, DM7493A Decade and Binary Counters
July 1992
DM5490/DM7490A, DM7493A
Decade and Binary Counters
General Description
Each of these monolithic counters contains four master-
slave flip-flops and additional gating to provide a divide-by-
two counter and a three-stage binary counter for which the
count cycle length is divide-by-five for the 90A and divide-
by-eight for the 93A.
All of these counters have a gated zero reset and the 90A
also has gated set-to-nine inputs for use in BCD nine's com-
plement applications.
To use their maximum count length (decade or four-bit bina-
ry), the B input is connected to the Q A output. The input
count pulses are applied to input A and the outputs are as
described in the appropriate truth table. A symmetrical di-
vide-by-ten count can be obtained from the 90A counters by
connecting the Q D output to the A input and applying the
input count to the B input which gives a divide-by-ten square
wave at output Q A .
Features
Y Typical power dissipation
Ð 90A 145 mW
Ð 93A 130 mW
Y Count frequency 42 MHz
Connection Diagrams
Dual-In-Line Package
TL/F/6533±1
Order Number DM5490J, DM5490W or DM7490AN
See NS Package Number J14A, N14A or W14B
Dual-In-Line Package
TL/F/6533±2
Order Number DM7493AN
See NS Package Number N14A
C 1995 National Semiconductor Corporation
TL/F/6533
RRD-B30M105/Printed in U. S. A.
337930515.002.png
Absolute Maximum Ratings (Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage
7V
Note: The ``AbsoluteMaximumRatings'' are those values
beyondwhich the safety of thedevice cannot be guaran-
teed.Thedeviceshouldnotbeoperatedattheselimits.The
parametricvaluesdefinedinthe``ElectricalCharacteristics''
tablearenotguaranteedattheabsolutemaximumratings.
The``RecommendedOperatingConditions''tablewilldefine
theconditionsforactualdeviceoperation.
Input Voltage
5.5V
Operating Free Air Temperature Range
DM54
b 55 § Cto a 125 § C
DM74
0 § Cto a 70 § C
Storage Temperature Range
b 65 § Cto a 150 § C
Recommended Operating Conditions
Symbol
Parameter
DM5490
DM7490A
Units
Min Nom Max Min Nom Max
V CC
Supply Voltage
4.5
5
5.5 4.75
5
5.25 V
V IH
High Level Input Voltage
2
2
V
V IL
Low Level Input Voltage
0.8
0.8
V
I OH
High Level Output Current
b 0.8
b 0.8 mA
I OL
Low Level Output Current
16
16 mA
f CLK
Clock Frequency
A
0
32
0
32
MHz
(Note 5)
B
0
16
0
16
t W
Pulse Width
A
15
15
(Note 5)
B
30
30
ns
Reset
15
15
t REL
Reset Release Time (Note 5)
25
25
ns
T A
Free Air Operating Temperature
b 55
125
0
70
§ C
'90A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max Units
(Note 1)
V I
Input Clamp Voltage V CC e Min, I I eb 12 mA
b 1.5
V
V OH
High Level Output
V CC e Min, I OH e Max
2.4
3.4
V
Voltage
V IL e Max, V IH e Min
V OL
Low Level Output
V CC e Min, I OL e Max
0.2
0.4
V
Voltage
V IH e Min, V IL e Max (Note 4)
I I
Input Current @ Max V CC e Max, V I e 5.5V
1
mA
I IH
High Level Input
V CC e Max
A
80
Current
V I e 2.7V
Reset
40
m A
B
120
I IL
Low Level Input
V CC e Max
A
b 3.2
Current
V I e 0.4V
Reset
b 1.6 mA
B
b 4.8
I OS
Short Circuit
V CC e Max
DM54 b 20
b 57
mA
Output Current
(Note 2)
DM74 b 18
b 57
I CC
Supply Current
V CC e Max (Note 3)
29
42
mA
Note 1: All typicals are at V CC e 5V, T A e 25 § C.
Note 2: Not more than one output should be shorted at a time.
Note 3: I CC is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V, and all other inputs grounded.
Note 4: Q A outputs are tested at I OL e Max plus the limit value of I IL for the B input. This permits driving the B input while maintaining full fan-out capability.
Note 5: T A e 25 § C and V CC e 5V.
2
Input Voltage
337930515.003.png
'90A Switching Characteristics
at V CC e 5V and T A e 25 § C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
R L e 400 X
Units
To (Output)
Min
Max
f MAX
Maximum Clock
A to Q A
32
MHz
Frequency
BtoQ B
16
t PLH
Propagation Delay Time
AtoQ A
16
ns
Low to High Level Output
t PHL
Propagation Delay Time
AtoQ A
18
ns
High to Low Level Output
t PLH
Propagation Delay Time
AtoQ D
48
ns
Low to High Level Output
t PHL
Propagation Delay Time
AtoQ D
50
ns
High to Low Level Output
t PLH
Propagation Delay Time
BtoQ B
16
ns
Low to High Level Output
t PHL
Propagation Delay Time
BtoQ B
21
ns
High to Low Level Output
t PLH
Propagation Delay Time
BtoQ C
32
ns
Low to High Level Output
t PHL
Propagation Delay Time
BtoQ C
35
ns
High to Low Level Output
t PLH
Propagation Delay Time
BtoQ D
32
ns
Low to High Level Output
t PHL
Propagation Delay Time
BtoQ D
35
ns
High to Low Level Output
t PLH
Propagation Delay Time
SET-9 to
30
ns
Low to High Level Output
Q A ,Q D
t PHL
Propagation Delay Time
SET-9 to
40
ns
High to Low Level Output
Q B ,Q C
t PHL
Propagation Delay Time
SET-0
40
ns
High to Low Level Output
Any Q
3
C L e 15 pF
337930515.004.png
Recommended Operating Conditions
Symbol
Parameter
DM7493A
Units
Min
Nom Max
V CC
Supply Voltage
4.75
5
5.25
V
V IH
High Level Input Voltage
2
V
V IL
Low Level Input Voltage
0.8
V
I OH
High Level Output Current
b 0.8
mA
I OL
Low Level Output Current
16
mA
f CLK
Clock Frequency
A
0
32
MHz
(Note 5)
B
0
16
t W
Pulse Width
A
15
(Note 5)
B
30
ns
Reset
15
t REL
Reset Release Time (Note 5)
25
ns
T A
Free Air Operating Temperature
0
70
§ C
'93A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max Units
(Note 1)
V I
Input Clamp Voltage V CC e Min, I I eb 12 mA
b 1.5
V
V OH
High Level Output
V CC e Min, I OH e Max
2.4
3.4
V
Voltage
V IL e Max, V IH e Min
V OL
Low Level Output
V CC e Min, I OL e Max
0.2
0.4
V
Voltage
V IH e Min, V IL e Max (Note 4)
I I
Input Current @ Max V CC e Max, V I e 5.5V
1
mA
I IH
High Level Input
V CC e Max
Reset
40
Current
V I e 2.4V
A
80
m A
B
80
I IL
Low Level Input
V CC e Max
Reset
b 1.6
Current
V I e 0.4V
A
b 3.2 mA
B
b 3.2
I OS
Short Circuit
V CC e Max
b 18
b 57 mA
Output Current
(Note 2)
I CC
Supply Current
V CC e Max (Note 3)
26
39
mA
Note 1: All typicals are at V CC e 5V, T A e 25 § C.
Note 2: Not more than one output should be shorted at a time.
Note 3: ICC is measured with all outputs open, both R0 inputs grounded following momentary connection to 4.5V and all other inputs grounded.
Note 4: QA outputs are tested at IOL e Max plus the limit value of IIL for the B input. This permits driving the B input while maintaining full fan-out capability.
Note 5: T A e 25 § C and V CC e 5V.
4
Input Voltage
337930515.005.png
'93A Switching Characteristics
at V CC e 5V and T A e 25 § C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
R L e 400 X
Units
To (Output)
Min
Max
f MAX
Maximum Clock
A to Q A
32
MHz
Frequency
BtoQ B
16
t PLH
Propagation Delay Time
A to
16
ns
Low to High Level Output
Q A
t PHL
Propagation Delay Time
A to
18
ns
High to Low Level Output
Q A
t PLH
Propagation Delay Time
A to
70
ns
Low to High Level Output
Q D
t PHL
Propagation Delay Time
A to
70
ns
High to Low Level Output
Q D
t PLH
Propagation Delay Time
B to
16
ns
Low to High Level Output
Q B
t PHL
Propagation Delay Time
B to
21
ns
High to Low Level Output
Q B
t PLH
Propagation Delay Time
B to
32
ns
Low to High Level Output
Q C
t PHL
Propagation Delay Time
B to
35
ns
High to Low Level Output
Q C
t PLH
Propagation Delay Time
B to
51
ns
Low to High Level Output
Q D
t PHL
Propagation Delay Time
B to
51
ns
High to Low Level Output
Q D
t PHL
Propagation Delay Time
SET-0
High to Low Level Output
to
40
ns
Any Q
5
C L e 15 pF
337930515.001.png

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