National Products Inverter User Manual
54LS14/DM74LS14 Hex Inverters
with Schmitt Trigger Inputs
General Description
This device contains six independent gates each of which
performs the logic INVERT function. Each input has hysteresis which increases the noise immunity and transforms a
slowly changing input signal to a fast changing, jitter free
output.
Connection Diagram
Dual-In-Line Package
54LS14/DM74LS14 Hex Inverters with Schmitt Trigger Inputs
June 1989
Order Number 54LS14DMQB, 54LS14FMQB,
54LS14LMQB, DM74LS14M or DM74LS14N
See NS Package Number E20A, J14A, M14A, N14A or W14B
TL/F/6353– 1
Function Table
YeA
Input Output
AY
LH
HL
e
H
High Logic Level
e
L
Low Logic Level
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
TL/F/6353
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
54LS
DM74LS 0
Storage Temperature Range
b
55§Ctoa125§C
Ctoa70§C
§
b
65§Ctoa150§C
Note:
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
Symbol Parameter
Min Nom Max Min Nom Max
V
CC
V
a
T
V
b
T
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
Positive-Going Input
Threshold Voltage (Note 1)
Negative-Going Input
Threshold Voltage (Note 1)
HYS Input Hysteresis (Note 1) 0.4 0.8 0.4 0.8 V
I
OH
I
OL
T
A
High Level Output Current
Low Level Output Current 4 8 mA
Free Air Operating Temperature
b
54LS14 DM74LS14
Units
1.5 1.6 2.0 1.4 1.6 1.9 V
0.6 0.8 1.1 0.5 0.8 1 V
b
0.4
b
0.4 mA
55 125 0 70
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
e
V
I
V
OH
V
OL
I
a
T
I
b
T
I
I
I
IH
I
IL
I
OS
I
CCH
I
CCL
Note 1: V
Note 2: All typicals are at V
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Input Clamp Voltage V
High Level Output V
Voltage V
Low Level Output V
Voltage V
Input Current at V
Positive-Going Threshold
Input Current at V
Negative-Going Threshold
Input Current@Max V
Input Voltage
High Level Input Current V
Low Level Input Current V
Short Circuit V
Output Current (Note 3)
Supply Current with V
Outputs High
Supply Current with V
Outputs Low
e
5V.
CC
e
e
5V, T
CC
25§C.
A
CC
CC
e
IL
CC
e
IH
V
CC
CC
CC
CC
V
CC
CC
CC
CC
CC
CC
eb
Min, I
e
Min, I
Max
e
Min, I
Min
e
Min, I
e
5V, V
e
5V, V
e
Max, V
e
Max, V
e
Max, V
e
Max, V
e
Max 54LS
e
Max
e
Max
18 mA
I
e
Max 54LS 2.5 3.4
OH
e
Max 54LS 0.25 0.4
OL
e
4 mA DM74 0.25 0.4
OL
e
V
a
I
T
e
V
b
I
T
e
7V DM74
I
e
10.0V 54LS
I
e
2.7V 20 m A
I
e
0.4V
I
DM74 2.7 3.4
DM74 0.35 0.5 V
DM74
DM74
b
DM74
b
2
20
20
Typ
(Note 2)
b
0.14 mA
b
0.18 mA
Max Units
b
1.5 V
0.1 mA
b
0.4 mA
b
100
b
100
8.6 16 mA
12 21 mA
C
§
V
mA
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