June 1986
Revised March 2000
DM74LS20
Dual 4-Input NAND Gate
General Description
This device contains two independent gates each of which performs the logic NAND function.
Ordering Code:
Order Number |
Package Number |
Package Description |
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DM74LS20M |
M14A |
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow |
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DM74LS20N |
N14A |
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide |
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Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram |
Function Table |
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Y = |
ABCD |
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Inputs |
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Output |
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A |
B |
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C |
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D |
Y |
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X |
X |
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X |
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L |
H |
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X |
X |
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L |
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X |
H |
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X |
L |
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X |
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X |
H |
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L |
X |
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X |
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X |
H |
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H |
H |
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H |
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H |
L |
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H = HIGH Logic Level
L = LOW Logic Level
X = Either LOW or HIGH Logic Level
Gate NAND Input-4 Dual DM74LS20
© 2000 Fairchild Semiconductor Corporation |
DS006355 |
www.fairchildsemi.com |
DM74LS20
Absolute Maximum Ratings(Note 1)
Supply Voltage |
7V |
Note 1: The “Absolute Maximum Ratings” are those values beyond which |
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the safety of the device cannot be guaranteed. The device should not be |
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Input Voltage |
7V |
operated at these limits. The parametric values defined in the Electrical |
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Characteristics tables are not guaranteed at the absolute maximum ratings. |
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Operating Free Air Temperature Range |
0°C to +70°C |
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The “Recommended Operating Conditions” table will define the conditions |
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Storage Temperature Range |
−65°C to +150°C |
for actual device operation. |
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Recommended Operating Conditions
Symbol |
Parameter |
Min |
Nom |
Max |
Units |
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VCC |
Supply Voltage |
4.75 |
5 |
5.25 |
V |
VIH |
HIGH Level Input Voltage |
2 |
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V |
VIL |
LOW Level Input Voltage |
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0.8 |
V |
IOH |
HIGH Level Output Current |
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−0.4 |
mA |
IOL |
LOW Level Output Current |
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8 |
mA |
TA |
Free Air Operating Temperature |
0 |
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70 |
°C |
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol |
Parameter |
Conditions |
Min |
Typ |
Max |
Units |
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(Note 2) |
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VI |
Input Clamp Voltage |
VCC = Min, II = −18 mA |
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−1.5 |
V |
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VOH |
HIGH Level |
VCC = Min, IOH = Max, |
2.7 |
3.4 |
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V |
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Output Voltage |
VIL = Max |
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VOL |
LOW Level |
VCC = Min, IOL = Max, |
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0.35 |
0.5 |
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Output Voltage |
VIH = Min |
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V |
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IOL = 4 mA, VCC = Min |
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0.25 |
0.4 |
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II |
Input Current @ Max Input Voltage |
VCC = Max, VI = 7V |
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0.1 |
mA |
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IIH |
HIGH Level Input Current |
VCC = Max, VI = 2.7V |
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20 |
μA |
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IIL |
LOW Level Input Current |
VCC = Max, VI = 0.4V |
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−0.36 |
mA |
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IOS |
Short Circuit Output Current |
VCC = Max (Note 3) |
−20 |
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−100 |
mA |
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ICCH |
Supply Current with Outputs HIGH |
VCC = Max |
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0.4 |
0.8 |
mA |
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ICCL |
Supply Current with Outputs LOW |
VCC = Max |
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1.2 |
2.2 |
mA |
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Switching Characteristics
at VCC = 5V and TA = 25°C
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RL = 2 kΩ |
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Symbol |
Parameter |
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CL = 15 pF |
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CL = 50 pF |
Units |
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Min |
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Max |
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Min |
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Max |
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tPLH |
Propagation Delay Time |
3 |
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10 |
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4 |
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15 |
ns |
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LOW-to-HIGH Level Output |
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tPHL |
Propagation Delay Time |
3 |
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10 |
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4 |
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15 |
ns |
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HIGH-to-LOW Level Output |
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www.fairchildsemi.com |
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