March 1989
Revised March 2000
DM74LS33
Quad 2-Input NOR Buffer with Open-Collector Outputs
General Description
This device contains four independent gates each of which perform the logic NOR function. Outputs are open-collec- tor.
Ordering Code:
Order Number |
Package Number |
Package Description |
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DM74LS33M |
M14A |
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow |
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DM74LS33N |
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 = |
A |
+ |
B |
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Inputs |
Output |
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A |
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B |
Y |
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L |
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L |
H |
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L |
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H |
L |
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H |
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L |
L |
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H |
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H |
L |
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H = HIGH Logic Level
L = LOW Logic Level
Outputs Collector-Open with Buffer NOR Input-2 Quad DM74LS33
© 2000 Fairchild Semiconductor Corporation |
DS010170 |
www.fairchildsemi.com |
DM74LS33
Absolute Maximum Ratings(Note 1)
Supply Voltage |
7V |
Input Voltage |
7V |
Output Voltage |
7V |
Operating Free Air Temperature Range |
0°C to +70°C |
Storage Temperature Range |
−65°C to +150°C |
Note 1: 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 tables 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 |
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 |
VOH |
HIGH Level Output Voltage |
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5.5 |
V |
IOL |
LOW Level Output Current |
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24 |
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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ICEX |
HIGH Level |
VCC = Min, VO = 5.5V, |
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100 |
μA |
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Output Current |
VIL = Max |
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VOL |
LOW Level |
VCC = Min, IOL = Max, |
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0.5 |
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Output Voltage |
VIH = Min |
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V |
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IOL = 12 mA, VCC = Min |
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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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−0.4 |
mA |
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ICCH |
Supply Current with |
VCC = Max |
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3.6 |
mA |
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Outputs HIGH |
VIN = GND |
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ICCL |
Supply Current with |
VCC = Max |
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13.8 |
mA |
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Outputs LOW |
VIN = Open |
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Note 2: All |
typicals are at VCC = 5V, TA = 25°C. |
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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 |
Units |
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Min |
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Max |
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tPLH |
Propagation Delay Time |
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22 |
ns |
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LOW-to-HIGH Level Output |
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tPHL |
Propagation Delay Time |
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22 |
ns |
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HIGH-to-LOW Level Output |
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www.fairchildsemi.com |
2 |
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