DM74LS20
Dual 4-Input NAND Gates
General Description
This device contains two independent gates each of which
performs the logic NAND function.
Features
n
Alternate Military/Aerospace device (54LS20) is
available. Contact a Fairchild Semiconductor Sales
Office/Distributor for specifications
Connection Diagram
Function Table
Y = ABCD
Inputs
Output
A
B
C
D
Y
X
X
X
L
H
X
X
L
X
H
X
L
X
X
H
L
X
X
X
H
H
H
H
H
L
H = High Logic Level
L = Low Logic Level
X = Either Low or High Logic Level
Dual-In-Line Package
DS006355-1
Order Number 54LS20DMQB, 54LS20FMQB, 54LS20LMQB,
DM54LS20J, DM54LS20W, DM74LS20M or DM74LS20N
See Package Number E20A, J14A, M14A, N14A or W14B
March 1998
DM74LS20
Dual
4-Input
NAND
Gates
© 1998 Fairchild Semiconductor Corporation
DS006355
www.fairchildsemi.com
Absolute Maximum Ratings
(Note 1)
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
DM54LS and 54LS
−55˚C to +125˚C
DM74LS
0˚C to +70˚C
Storage Temperature Range
−65˚C to +150˚C
Recommended Operating Conditions
Symbol
Parameter
DM54LS20
DM74LS20
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
0.7
0.8
V
I
OH
High Level Output Current
−0.4
−0.4
mA
I
OL
Low Level Output Current
4
8
mA
T
A
Free Air Operating Temperature
−55
125
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.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 2)
V
I
Input Clamp Voltage
V
CC
= Min, I
I
= −18 mA
−1.5
V
V
OH
High Level Output
V
CC
= Min, I
OH
= Max,
DM54
2.5
3.4
V
Voltage
V
IL
= Max
DM74
2.7
3.4
V
OL
Low Level Output
V
CC
= Min, I
OL
= Max,
DM54
0.25
0.4
Voltage
V
IH
= Min
DM74
0.35
0.5
V
I
OL
= 4 mA, V
CC
= Min
DM74
0.25
0.4
I
I
Input Current
@
Max
V
CC
= Max, V
I
= 7V
0.1
mA
Input Voltage
I
IH
High Level Input Current
V
CC
= Max, V
I
= 2.7V
20
µA
I
IL
Low Level Input Current
V
CC
= Max, V
I
= 0.4V
−0.36
mA
I
OS
Short Circuit
V
CC
= Max
DM54
−20
−100
mA
Output Current
(Note 3)
DM74
−20
−100
I
CCH
Supply Current with
V
CC
= Max
0.4
0.8
mA
Outputs High
I
CCL
Supply Current with
V
CC
= Max
1.2
2.2
mA
Outputs Low
Switching Characteristics
at V
CC
= 5V and T
A
= 25˚C
R
L
= 2 k
Ω
Symbol
Parameter
C
L
= 15 pF
C
L
= 50 pF
Units
Min
Max
Min
Max
t
PLH
Propagation Delay Time
3
10
4
15
ns
Low to High Level Output
t
PHL
Propagation Delay Time
3
10
4
15
ns
High to Low Level Output
Note 2: All typicals are at V
CC
= 5V, T
A
= 25˚C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
www.fairchildsemi.com
2
3
Physical Dimensions
inches (millimeters) unless otherwise noted
Ceramic Leadless Chip Carrier Package (E)
Order Number 54LS20LMQB
Package Number E20A
14-Lead Ceramic Dual-In-Line Package (J)
Order Number 54LS20DMQB or DM54LS20J
Package Number J14A
www.fairchildsemi.com
4
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
14-Lead Small Outline Molded Package (M)
Order Number DM74LS20M
Package Number M14A
14-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS20N
Package Number N14A
5
www.fairchildsemi.com
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE-
VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMI-
CONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or sys-
tems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, and (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
Fairchild Semiconductor
Corporation
Americas
Customer Response Center
Tel: 1-888-522-5372
www.fairchildsemi.com
Fairchild Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 8 141-35-0
English
Tel: +44 (0) 1 793-85-68-56
Italy
Tel: +39 (0) 2 57 5631
Fairchild Semiconductor
Hong Kong Ltd.
13th Floor, Straight Block,
Ocean Centre, 5 Canton Rd.
Tsimshatsui, Kowloon
Hong Kong
Tel: +852 2737-7200
Fax: +852 2314-0061
National Semiconductor
Japan Ltd.
Tel: 81-3-5620-6175
Fax: 81-3-5620-6179
14-Lead Ceramic Flat Package (W)
Order Number 54LS20FMQB or DM54LS20W
Package Number W14B
DM74LS20
Dual
4-Input
NAND
Gates
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.