DM74LS28中文资料
? 2000 Fairchild Semiconductor Corporation DS010169
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March 1989Revised March 2000
DM74LS28 Quad 2-Input NOR Buffer
DM74LS28
Quad 2-Input NOR Buffer
General Description
The DM74LS28 contains four independent gates each of which perform the logic NOR function.
Ordering Code:
Devices also available in T ape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Truth Table
Y = A +B H = HIGH logic level L = LOW logic level
Order Number Package Number
Package Description
DM74LS28M
M14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
Inputs Output
A B Y L L H L H L H L L H
H
L
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D M 74L S 28
Absolute Maximum Ratings (Note 1)
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
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)Note 2: All typicals are at V CC = 5V, T A = 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
V CC = +5.0V, T A = +25°C
Supply Voltage 7V Input Voltage
7V
Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range
?65°C to +150°C
Symbol Parameter
Min Nom Max Units V CC Supply Voltage
4.755
5.25
V V IH HIGH Level Input Voltage 2
V V IL LOW Level Input Voltage 0.7V I OH HIGH Level Output Current ?1.2mA I OL LOW Level Output Current 24mA T A
Free Air Operating Temperature
70
°C
Symbol Parameter
Conditions
Min
Typ Max Units (Note 2)
V I Input Clamp Voltage V CC = Min, I I = ?18 mA
?1.5
V V OH HIGH Level Output Voltage V CC = Min, I OH = Max, V IL = Max 2.7
V V OL LOW Level Output Voltage V CC = Min, I OL = Max, V IH = Min 0.5V I OL = 12 mA, V CC = Min 0.4I I Input Current @ Max Input Voltage V CC = Max, V I = 7V 0.1mA I IH HIGH Level Input Current V CC = Max, V I = 2.7V 20μA I IL LOW Level Input Current V CC = Max, V I = 0.4V ?0.4mA I OS Short Circuit Output Current V CC = Max (Note 3)?30?130mA I CCH Supply Current with Outputs HIGH V CC = Max 3.6mA I CCL
Supply Current with Outputs LOW
V CC = Max
13.8
mA
R L = 2 k ?
Symbol Parameter
C L = 15 pF
Units
Min
Max t PLH Propagation Delay Time 20ns LOW-to-HIGH Level Output t PHL
Propagation Delay Time 20
ns HIGH-to-LOW Level Output
3
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DM74LS28 Quad 2-Input NOR Buffer
Physical Dimensions inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
Package Number M14A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:1.Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea-sonably expected to result in a significant injury to the user.
2. A critical component in any component of a life support device or system whose failure to perform can be rea-sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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