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National Semiconductor Electronic Components Datasheet

74LS20 Datasheet

Dual 4-Input NAND Gates

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June 1989
54LS20 DM54LS20 DM74LS20 Dual 4-Input NAND Gates
General Description
This device contains two independent gates each of which
performs the logic NAND function
Features
Y Alternate Military Aerospace device (54LS20) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
Function Table
Order Number 54LS20DMQB 54LS20FMQB 54LS20LMQB
DM54LS20J DM54LS20W DM74LS20M or DM74LS20N
See NS Package Number E20A J14A M14A N14A or W14B
TL F 6355 – 1
Y e ABCD
Inputs
A B CD
X X XL
X X LX
X L XX
L X XX
H H HH
H e High Logic Level
L e Low Logic Level
X e Either Low or High Logic Level
Output
Y
H
H
H
H
L
C1995 National Semiconductor Corporation TL F 6355
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

74LS20 Datasheet

Dual 4-Input NAND Gates

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
7V
Operating Free Air Temperature Range
DM54LS and 54LS
b55 C to a125 C
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
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
Min
45
2
b55
DM54LS20
Nom
5
Max
55
07
b0 4
4
125
Min
4 75
2
0
DM74LS20
Nom
5
Max
5 25
08
b0 4
8
70
Units
V
V
V
mA
mA
C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol
VI
VOH
VOL
II
IIH
IIL
IOS
ICCH
ICCL
Parameter
Input Clamp Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Current Max
Input Voltage
High Level Input Current
Low Level Input Current
Short Circuit
Output Current
Supply Current with
Outputs High
Supply Current with
Outputs Low
Conditions
VCC e Min II e b18 mA
VCC e Min IOH e Max
VIL e Max
VCC e Min IOL e Max
VIH e Min
IOL e 4 mA VCC e Min
VCC e Max VI e 7V
DM54
DM74
DM54
DM74
DM74
VCC e Max VI e 2 7V
VCC e Max VI e 0 4V
VCC e Max
(Note 2)
VCC e Max
DM54
DM74
VCC e Max
Min
25
27
b20
b20
Typ
(Note 1)
34
34
0 25
0 35
0 25
04
12
Max
b1 5
04
05
04
01
20
b0 36
b100
b100
08
22
Units
V
V
V
mA
mA
mA
mA
mA
mA
Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
RL e 2 kX
CL e 15 pF
CL e 50 pF
Min Max Min Max
Units
tPLH
Propagation Delay Time
Low to High Level Output
3
10
4
15 ns
tPHL
Propagation Delay Time
High to Low Level Output
3
10
4
15 ns
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 and the duration should not exceed one second
2


Part Number 74LS20
Description Dual 4-Input NAND Gates
Maker National Semiconductor
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74LS20 Datasheet PDF






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