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National Semiconductor Electronic Components Datasheet

7493 Datasheet

Decade and Binary Counters

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June 1989
DM74LS90 DM74LS93
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 ’LS90 and divide-
by-eight for the ’LS93
All of these counters have a gated zero reset and the LS90
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 ’LS90 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 45 mW
Y Count frequency 42 MHz
Connection Diagrams (Dual-In-Line Packages)
TL F 6381 – 1
Order Number DM74LS90M or DM74LS90N
See NS Package Number M14A or N14A
TL F 6381 – 2
Order Number DM74LS93M or DM74LS93N
See NS Package Number M14A or N14A
C1995 National Semiconductor Corporation TL F 6381
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

7493 Datasheet

Decade and Binary Counters

No Preview Available !

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 (Reset)
7V
Input Voltage (A or B)
5 5V
Operating Free Air Temperature Range
DM74LS
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
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
Recommended Operating Conditions
Symbol
Parameter
VCC Supply Voltage
VIH High Level Input Voltage
VIL Low Level Input Voltage
IOH High Level Output Current
IOL Low Level Output Current
fCLK
Clock Frequency (Note 1)
fCLK
Clock Frequency (Note 2)
tW Pulse Width (Note 1)
tW Pulse Width (Note 2)
tREL
Reset Release Time (Note 1)
tREL
Reset Release Time (Note 2)
TA Free Air Operating Temperature
Note 1 CL e 15 pF RL e 2 kX TA e 25 C and VCC e 5V
Note 2 CL e 50 pF RL e 2 kX TA e 25 C and VCC e 5V
A to QA
B to QB
A to QA
B to QB
A
B
Reset
A
B
Reset
DM74LS90
Min Nom Max
4 75 5
5 25
2
08
b0 4
8
0 32
0 16
0 20
0 10
15
30
15
25
50
25
25
35
0 70
’LS90 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
(Note 1)
Max
VI
VOH
VOL
Input Clamp Voltage
High Level Output
Voltage
Low Level Output
Voltage
VCC e Min II e b18 mA
VCC e Min IOH e Max
VIL e Max VIH e Min
VCC e Min IOL e Max
VIL e Max VIH e Min
(Note 4)
b1 5
27 34
0 35 0 5
IOL e 4 mA VCC e Min
II
Input Current Max
VCC e Max VI e 7V
Reset
Input Voltage
VCC e Max
A
VI e 5 5V
B
0 25 0 4
01
02
04
Units
V
V
V
mA
mA
MHz
MHz
ns
ns
ns
ns
C
Units
V
V
V
mA
2


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