National Semiconductor DM7427 Technical data
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DM7427 Triple 3-Input NOR Gates
General Description
This device contains three independent gates each of which
performs the logic NOR function.
Connection Diagram
DM7427 Triple 3-Input NOR Gates
June 1989
Dual-In-Line Package
Order Number DM7427N
See NS Package Number N14A
TL/F/6509– 1
Function Table
YeAaBaC
Inputs Output
ABC Y
LLL H
XXH L
XHX L
HXX L
e
H
High Logic Level
e
L
Low Logic Level
e
X
Either High or Low Logic Level
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
TL/F/6509
Absolute Maximum Ratings (Note)
Supply Voltage 7V
Input Voltage 5.5V
Operating Free Air Temperature Range
DM74 0
Storage Temperature Range
Ctoa70§C
§
b
65§Ctoa150§C
The ‘‘Absolute Maximum Ratings’’ are those values
Note:
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
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage 4.75 5 5.25 V
High Level Input Voltage 2 V
Low Level Input Voltage 0.8 V
High Level Output Current
Low Level Output Current 16 mA
Free Air Operating Temperature 0 70
Min Nom Max
DM7427
b
0.8 mA
Units
C
§
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
e
V
V
V
I
I
I
IH
I
IL
I
OS
I
CCH
I
CCL
I
OH
OL
Input Clamp Voltage V
High Level Output V
Voltage V
Low Level Output V
Voltage V
Input Current@Max V
Input Voltage
High Level Input Current V
Low Level Input Current V
Short Circuit V
Output Current
Supply Current with V
Outputs High
Supply Current with V
Outputs Low
CC
CC
IL
CC
IH
CC
CC
CC
CC
CC
CC
e
e
Min, I
e
Min, I
Max
e
Min, I
Min
e
Max, V
e
Max, V
e
Max, V
e
Max (Note 2)
e
Max
e
Max
eb
12 mA
I
e
Max
OH
e
Max
OL
e
5.5V
I
e
2.4V 40 mA
I
e
0.4V
I
2.4 3.4 V
b
18
Typ
(Note 1)
Max Units
b
1.5 V
0.2 0.4 V
1mA
b
1.6 mA
b
57 mA
10 16 mA
16 26 mA
Switching Characteristics at V
CC
e
5V and T
e
25§C (See Section 1 for Test Waveforms and Output Load)
A
Symbol Parameter Conditions Min Max Units
t
PLH
t
PHL
Note 1: All typicals are at V
Note 2: Not more than one output should be shorted at a time.
Propagation Delay Time C
Low to High Level Output R
Propagation Delay Time
High to Low Level Output
e
e
5V, T
CC
25§C.
A
e
15 pF
L
e
400X
L
11 ns
15 ns
2
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