Page 1
Semiconductor
Dual 4-Input NAND Gate
SL74HCT20
High-Performance Silicon-Gate CMOS
The SL74HCT20 is identical in pinout to the LS/ALS20. The
SL74HCT20 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
LOGIC DIAGRAM
ORDERING INFORMATION
SL74HCT20N Plastic
SL74HCT20D SOIC
TA = -55° to 125° C for all packages
PIN ASSIGNMENT
SLS
PINS 3,11 = NO CONNECTION
System Logic
PIN 14 =VCC
PIN 7 = GND
NC = NO CONNECTION
FUNCTION TABLE
Inputs Output
A B C D Y
L X X X H
X L X X H
X X L X H
X X X L H
H H H H L
X = don’t care
Page 2
SL74HCT20
Semiconductor
MAXIMUM RATINGS*
Symbol Parameter Value Unit
VCC DC Supply Voltage (Referenced to GND) -0.5 to +7.0 V
VIN DC Input Voltage (Referenced to GND) -1.5 to VCC +1.5 V
V
DC Output Voltage (Referenced to GND) -0.5 to VCC +0.5 V
OUT
IIN DC Input Current, per Pin ±20 mA
I
DC Output Current, per Pin ±25 mA
OUT
ICC DC Supply Current, VCC and GND Pins ±50 mA
PD Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
750
500
Tstg Storage Temperature -65 to +150 °C
TL Lead Temperature, 1 mm from Case for 10 Seconds
260 °C
(Plastic DIP or SOIC Package)
*
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 Parameter Min Max Unit
VCC DC Supply Voltage (Referenced to GND) 4.5 5.5 V
VIN, V
DC Input Voltage, Output Voltage (Referenced to GND) 0 VCC V
OUT
TA Operating Temperature, All Package Types -55 +125 °C
tr, tf Input Rise and Fall Time (Figure 1) 0 500 ns
mW
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, VIN and V
GND≤(VIN or V
OUT
)≤VCC.
should be constrained to the range
OUT
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC).
Unused outputs must be left open.
System Logic
SLS
Page 3
SL74HCT20
Semiconductor
DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND)
VCC Guaranteed Limit
Symbol Parameter Test Conditions V 25 °C
to
-55°C
VIH Minimum High-Level
Input Voltage
VIL Maximum Low -Level
Input Voltage
VOH Minimum High-Level
Output Voltage
VIN= VIH or VIL
VOL Maximum Low -Level
Output Voltage
VIN=VIH
IIN Maximum Input
V
=0.1 V or VCC-0.1 V
OUT
I
≤ 20 µA
OUT
V
=0.1 V or VCC-0.1 V
OUT
I
≤ 20 µA
OUT
VIN= VIH or VIL
I
≤ 20 µA
OUT
4.5
5.5
4.5
5.5
4.5
5.5
2.0
2.0
0.8
0.8
4.4
5.4
I
≤ 4.0 mA
OUT
VIN=VIH
I
≤ 20 µA
OUT
4.5 3.98 3.84 3.7
4.5
5.5
0.1
0.1
I
≤ 4.0 mA
OUT
4.5 0.26 0.33 0.4
VIN=VCC or GND 5.5 ±0.1 ±1.0 ±1.0 µA
Leakage Current
ICC Maximum Quiescent
Supply Current
VIN=VCC or GND
I
=0µA
OUT
5.5 2.0 20 40 µA
(per Package)
∆ICC Quiescent Additional
Supply Current
VIN=2.4 V,Any One Input
VIN=VCC or GND, Other
≥-55 °C 25 °C to
Inputs
≤85
°C
2.0
2.0
0.8
0.8
4.4
5.4
0.1
0.1
≤125
°C
2.0
2.0
0.8
0.8
4.4
5.4
0.1
0.1
125°C
Unit
V
V
V
V
mA
I
System Logic
SLS
=0µA 5.5 2.9 2.4
OUT
Page 4
SL74HCT20
Semiconductor
AC ELECTRICAL CHARACTERISTICS(V
=5.0 V ±10%,CL=50pF,Input tr=tf=6.0 ns)
CC
Guaranteed Limit
Symbol Parameter 25 °C to
≤85°C ≤125°C Unit
-55°C
t
, t
PLH
Maxim um Propagation Delay, Input A ,B,C or D to
PHL
28 35 42 ns
Output Y (Figures 1 and 2)
t
, t
TLH
Maximum Output Transition Time, Any Output
THL
15 19 22 ns
(Figures 1 and 2)
CIN Maximum Input Capacitance 10 10 10 pF
Power Dissipation Capacitance (Per Gate) Typical @25°C,VCC=5.0 V
CPD Used to determine the no-load dynamic power
consumption:
PD=CPDV
2
f+ICCVCC
CC
29 pF
Figure 1. Switching Waveforms Figure 2. Test Circuit
EXPANDED LOGIC DIAGRAM
(1/2 of the Device)
SLS
System Logic
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