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Fairchild Semiconductor Electronic Components Datasheet

DM74LS90M Datasheet

Decade and Binary Counters

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March 1998
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
complement applications.
To use their maximum count length (decade or four bit bi-
nary), 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 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
n Typical power dissipation 45 mW
n Count frequency 42 MHz
Connection Diagrams (Dual-In-Line Packages)
DS006381-1
Order Number DM74LS90M or DM74LS90N
See Package Number M14A or N14A
DS006381-2
Order Number DM74LS93M or DM74LS93N
See Package Number M14A or N14A
© 1998 Fairchild Semiconductor Corporation DS006381
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

DM74LS90M Datasheet

Decade and Binary Counters

No Preview Available !

Absolute Maximum Ratings (Note 1)
Supply Voltage
Input Voltage (Reset)
Input Voltage (A or B)
7V
7V
5.5V
Operating Free Air Temperature Range
DM74LS
Storage Temperature Range
0˚C to +70˚C
−65˚C to +150˚C
Recommended Operating Conditions
Symbol
Parameter
DM74LS90
Units
Min
Nom
Max
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 2)
A to QA
B to QB
fCLK
Clock Frequency (Note 3)
A to QA
B to QB
tW
Pulse Width (Note 2)
A
B
4.75
5
5.25
V
2
V
0.8
V
−0.4
mA
8
mA
0
32
MHz
0
16
0
20
MHz
0
10
15
30
ns
Reset
15
tW
Pulse Width (Note 3)
A
25
B
50
ns
Reset
25
tREL
Reset Release Time (Note 2)
25
ns
tREL
Reset Release Time (Note 3)
35
ns
TA
Free Air Operating Temperature
0
70
˚C
Note 1: 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.
Note 2: CL = 15 pF, RL = 2 k, TA = 25˚C and VCC = 5V.
Note 3: CL = 50 pF, RL = 2 k, TA = 25˚C and VCC = 5V.
’LS90 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
Input Clamp Voltage
VCC = Min, II = −18 mA
VOH
High Level Output
VCC = Min, IOH = Max
2.7
Voltage
VIL = Max, VIH = Min
VOL
Low Level Output
VCC = Min, IOL = Max
Voltage
VIL = Max, VIH = Min
(Note 7)
IOL = 4 mA, VCC = Min
II
Input Current @ Max
VCC = Max, VI = 7V
Reset
Input Voltage
VCC = Max
A
VI = 5.5V
B
IIH
High Level Input
VCC = Max, VI = 2.7V
Reset
Current
A
B
Typ
(Note 4)
3.4
0.35
0.25
Max
Units
−1.5
V
V
0.5
V
0.4
0.1
0.2
mA
0.4
20
40
µA
80
www.fairchildsemi.com
2


Part Number DM74LS90M
Description Decade and Binary Counters
Maker Fairchild Semiconductor
PDF Download

DM74LS90M Datasheet PDF






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