Freelance Electronics Components Distributor
Closed Dec 25th-26th
800-300-1968
We Stock Hard to Find Parts

DM74LS90N

Part # DM74LS90N
Description IC COUNTER BINARY DECADE 14-DIP
Category IC
Availability In Stock
Qty 1
Qty Price
1 + $2.95298
Manufacturer Available Qty
Fairchild Semiconductor
Date Code: 0006
  • Shipping Freelance Stock: 1
    Ships Immediately



Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

© 2000 Fairchild Semiconductor Corporation DS006381 www.fairchildsemi.com
August 1986
Revised March 2000
DM74LS90 Decade and Binary Counters
DM74LS90
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 DM74LS90.
All of these counters have a gated zero reset and the
DM74LS90 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
binary), 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 symmetri-
cal divide-by-ten count can be obtained from the
DM74LS90 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
Typical power dissipation 45 mW
Count frequency 42 MHz
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Reset/Count Truth Table
Order Number Package Number Package Description
DM74LS90M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
DM74LS90N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Reset Inputs Output
R0(1) R0(2) R9(1) R9(2) Q
D
Q
C
Q
B
Q
A
H H L X LLLL
H H X L LLLL
XXHHHLLH
X L X L COUNT
L X L X COUNT
L X X L COUNT
X L L X COUNT
www.fairchildsemi.com 2
DM74LS90
Function Tables
BCD Count Sequence (Note 1)
Bi-Quinary (5-2) (Note 2)
H = HIGH Level
L = LOW Level
X = Don’t Care
Note 1: Output Q
A
is connected to input B for BCD count.
Note 2: Output Q
D
is connected to input A for bi-quinary count.
Note 3: Output Q
A
is connected to input B.
Logic Diagram
The J and K inputs shown without connection are for reference only and
are functionally at a high level.
Count Output
Q
D
Q
C
Q
B
Q
A
0 LLLL
1LLLH
2LLHL
3LLHH
4LHLL
5LHLH
6LHHL
7 LHHH
8 HLLL
9HLLH
Count Output
Q
A
Q
D
Q
C
Q
B
0 LLLL
1LLLH
2LLHL
3LLHH
4LHLL
5 HLLL
6HLLH
7HLHL
8HLHH
9HHLL
3 www.fairchildsemi.com
DM74LS90
Absolute Maximum Ratings(Note 4)
Note 4: 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.
Recommended Operating Conditions
Note 5: C
L
= 15 pF, R
L
= 2 k, T
A
= 25°C and V
CC
= 5V.
Note 6: C
L
= 50 pF, R
L
= 2 k, T
A
= 25°C and V
CC
= 5V.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 7: All typicals are at V
CC
= 5V, T
A
= 25°C.
Supply Voltage 7V
Input Voltage (Reset) 7V
Input Voltage (A or B) 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range 65°C to +150°C
Symbol Parameter Min Nom Max Units
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 0.4 mA
I
OL
LOW Level Output Current 8 mA
f
CLK
Clock Frequency (Note 5) A to Q
A
032MHz
B to Q
B
016
f
CLK
Clock Frequency (Note 6) A to Q
A
020MHz
B to Q
B
010
t
W
Pulse Width (Note 5) A 15
B30 ns
Reset 15
t
W
Pulse Width (Note 6) A 25
B50 ns
Reset 25
t
REL
Reset Release Time (Note 5) 25 ns
t
REL
Reset Release Time (Note 6) 35 ns
T
A
Free Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min
Typ
Max Units
(Note 7)
V
I
Input Clamp Voltage V
CC
= Min, I
I
= 18 mA 1.5 V
V
OH
HIGH Level V
CC
= Min, I
OH
= Max
2.7 3.4 V
Output Voltage V
IL
= Max, V
IH
= Min
V
OL
LOW Level V
CC
= Min, I
OL
= Max
(Note 8)
VOutput Voltage V
IL
= Max, V
IH
= Min 0.35 0.5
I
OL
= 4 mA, V
CC
= Min 0.25 0.4
I
I
Input Current @ Max V
CC
= Max, V
I
= 7V Reset 0.1
mAInput Voltage V
CC
= Max A 0.2
V
I
= 5.5V B 0.4
I
IH
HIGH Level V
CC
= Max, V
I
= 2.7V Reset 20
µAInput Current A 40
B80
I
IL
LOW Level V
CC
= Max, V
I
= 0.4V Reset 0.4
mAInput Current A 2.4
B 3.2
I
OS
Short Circuit Output Current V
CC
= Max (Note 9) 20 100 mA
I
CC
Supply Current V
CC
= Max (Note 7) 9 15 mA
12NEXT