TECHNICAL DATA
IN74HCT20A
Dual 4-Input NAND Gate
High-Performance Silicon-Gate CMOS
The IN74HCT20A is identical in pinout to the LS/ALS20. The
IN74HCT20A may be used as a level converter for interfacing TTL or
NMOS outputs to High-Speed CMOS inputs.
•
TTL/NMOS-Compatible Input Levels
•
Outputs Directly Interface to CMOS, NMOS, and TTL
•
Operating Voltage Range: 4.5 to 5.5 V
•
Low Input Current: 1.0
µA
•
High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
IN74HCT20AN Plastic
IN74HCT20AD SOIC
T
A
= -55° to 125° C for all packages
LOGIC DIAGRAM
PIN ASSIGNMENT
NC = NO CONNECTION
PIN 14 =V
CC
PIN 7 = GND
PINS 3,11 = NO CONNECTION
FUNCTION TABLE
Inputs
A
L
X
X
X
H
B
X
L
X
X
H
C
X
X
L
X
H
D
X
X
X
L
H
Output
Y
H
H
H
H
L
X = don’t care
1
IN74HCT20A
MAXIMUM RATINGS
*
Symbol
V
CC
V
IN
V
OUT
I
IN
I
OUT
I
CC
P
D
Tstg
T
L
*
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Current, per Pin
DC Supply Current, V
CC
and GND Pins
Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
Storage Temperature
Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
Value
-0.5 to +7.0
-1.5 to V
CC
+1.5
-0.5 to V
CC
+0.5
±20
±25
±50
750
500
-65 to +150
260
Unit
V
V
V
mA
mA
mA
mW
°C
°C
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
IN
, V
OUT
T
A
t
r
, t
f
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
Operating Temperature, All Package Types
Input Rise and Fall Time
(Figure 1)
Min
4.5
0
-55
0
Max
5.5
V
CC
+125
500
Unit
V
V
°C
ns
This device contains protection circuitry to guard against damage due to high static voltages or electric fields.
However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this
high-impedance circuit. For proper operation, V
IN
and V
OUT
should be constrained to the range GND≤(V
IN
or
V
OUT
)≤V
CC
.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
CC
). Unused
outputs must be left open.
2
IN74HCT20A
DC ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND)
V
CC
Symbol
Parameter
Test Conditions
V
Guaranteed Limit
25
°C
to
-55°C
2.0
2.0
0.8
0.8
4.4
5.4
3.98
0.1
0.1
0.26
±0.1
2.0
≤85
°C
2.0
2.0
0.8
0.8
4.4
5.4
3.84
0.1
0.1
0.33
±1.0
20
≤125
°C
2.0
2.0
0.8
0.8
4.4
5.4
3.7
0.1
0.1
0.4
±1.0
40
µA
µA
V
Unit
V
IH
V
IL
V
OH
Minimum High-
Level Input Voltage
Maximum Low -
Level Input Voltage
Minimum High-
Level Output Voltage
V
OUT
=0.1 V or V
CC
-0.1 V
⎢I
OUT
⎢≤
20
µA
V
OUT
=0.1 V or V
CC
-0.1 V
⎢I
OUT
⎢ ≤
20
µA
V
IN
= V
IH
or V
IL
⎢I
OUT
⎢ ≤
20
µA
V
IN
= V
IH
or V
IL
⎢I
OUT
⎢ ≤
4.0 mA
4.5
5.5
4.5
5.5
4.5
5.5
4.5
4.5
5.5
4.5
5.5
5.5
V
V
V
V
OL
Maximum Low-
Level Output Voltage
V
IN
=V
IH
⎢I
OUT
⎢ ≤
20
µA
V
IN
=V
IH
⎢I
OUT
⎢ ≤
4.0 mA
I
IN
I
CC
Maximum Input
Leakage Current
Maximum Quiescent
Supply Current
(per Package)
Quiescent Additional
Supply Current
V
IN
=V
CC
or GND
V
IN
=V
CC
or GND
I
OUT
=0µA
V
IN
=2.4 V,Any One Input
V
IN
=V
CC
or GND, Other
Inputs
I
OUT
=0µA
∆I
CC
≥-55 °C
25
°C
to
125°C
2.4
mA
5.5
2.9
3
IN74HCT20A
AC ELECTRICAL CHARACTERISTICS
(V
CC
=5.0 V
±10%,C
L
=50pF,Input t
r
=t
f
=6.0 ns)
Guaranteed Limit
Symbol
Parameter
25
°C
to
-55°C
28
15
10
≤85°C
≤125°C
Unit
t
PLH
, t
PHL
t
TLH
, t
THL
C
IN
Maximum Propagation Delay, Input A ,B,C or D
to Output Y (Figures 1 and 2)
Maximum Output Transition Time, Any Output
(Figures 1 and 2)
Maximum Input Capacitance
Power Dissipation Capacitance (Per Gate)
35
19
10
42
22
10
ns
ns
pF
Typical @25°C,V
CC
=5.0 V
29
pF
C
PD
Used to determine the no-load dynamic power
consumption:
P
D
=C
PD
V
CC2
f+I
CC
V
CC
Figure 1. Switching Waveforms
Figure 2. Test Circuit
EXPANDED LOGIC DIAGRAM
(1/2 of the Device)
4
IN74HCT20A
N SUFFIX PLASTIC DIP
(MS - 001AA)
A
14
8
B
1
7
Dimension, mm
Symbol
A
B
C
MIN
18.67
6.1
MAX
19.69
7.11
5.33
0.36
1.14
2.54
7.62
0°
2.92
7.62
0.2
0.38
10°
3.81
8.26
0.36
0.56
1.78
F
L
D
F
C
-T-
SEATING
N
G
D
0.25 (0.010) M T
K
PLANE
G
H
H
J
M
J
K
L
M
N
NOTES:
1. Dimensions “A”, “B” do not include mold flash or protrusions.
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
D SUFFIX SOIC
(MS - 012AB)
Dimension, mm
8
A
14
Symbol
A
MIN
8.55
3.8
1.35
0.33
0.4
1.27
5.27
0°
0.1
0.19
5.8
0.25
MAX
8.75
4
1.75
0.51
1.27
H
B
P
B
C
1
G
7
C
R x 45
D
F
G
-T-
D
0.25 (0.010) M T C M
K
SEATING
PLANE
H
J
F
M
J
K
M
P
R
8°
0.25
0.25
6.2
0.5
NOTES:
1. Dimensions A and B do not include mold flash or protrusion.
2. Maximum mold flash or protrusion 0.15 mm (0.006) per side
for A; for B
‑
0.25 mm (0.010) per side.
5
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