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National Semiconductor Electronic Components Datasheet


7493

Decade and Binary Counters


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7493 pdf
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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 QA 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 QD output to the A input and applying the
input count to the B input which gives a divide-by-ten square
wave at output QA
Features
Y Typical power dissipation
90A 145 mW
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
Order Number DM7493AN
See NS Package Number N14A
TL F 6533 – 2
C1995 National Semiconductor Corporation TL F 6533
RRD-B30M105 Printed in U S A



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7493 pdf
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
Input Voltage
5 5V
Operating Free Air Temperature Range
DM54
b55 C to a125 C
DM74
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Recommended Operating Conditions
Symbol
Parameter
VCC
VIH
VIL
IOH
IOL
fCLK
tW
tREL
TA
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Clock Frequency
(Note 5)
A
B
Pulse Width
(Note 5)
A
B
Reset
Reset Release Time (Note 5)
Free Air Operating Temperature
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed 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
Min
45
2
0
0
15
30
15
25
b55
DM5490
Nom
5
Max
55
08
b0 8
16
32
16
125
DM7490A
Min Nom Max
4 75 5
5 25
2
08
b0 8
16
0 32
0 16
15
30
15
25
0 70
Units
V
V
V
mA
mA
MHz
ns
ns
C
’90A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
(Note 1)
Max
Units
VI
VOH
VOL
II
Input Clamp Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Current Max
Input Voltage
VCC e Min II e b12 mA
VCC e Min IOH e Max
VIL e Max VIH e Min
VCC e Min IOL e Max
VIH e Min VIL e Max (Note 4)
VCC e Max VI e 5 5V
b1 5
V
24 34
V
02 04 V
1 mA
IIH
High Level Input
VCC e Max
Current
VI e 2 7V
A
Reset
80
40 mA
B 120
IIL
Low Level Input
VCC e Max
Current
VI e 0 4V
A
Reset
b3 2
b1 6
mA
B b4 8
IOS Short Circuit
Output Current
VCC e Max
(Note 2)
DM54
DM74
b20
b18
b57
b57
mA
ICC Supply Current
VCC e Max (Note 3)
29 42 mA
Note 1 All typicals are at VCC e 5V TA 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 RO 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 TA e 25 C and VCC e 5V
2



Part Number 7493
Description Decade and Binary Counters
Maker National Semiconductor - National Semiconductor
Total Page 10 Pages
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