DM74LS21中文资料
TL F 635654LS21 DM54LS21 DM74LS21 Dual 4-Input AND Gates
June1989
54LS21 DM54LS21 DM74LS21Dual4-Input AND Gates General Description
This device contains two independent gates each of which
performs the logic AND function
Features
Y Alternate Military Aerospace device(54LS21)is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
TL F 6356–1
Order Number54LS21DMQB 54LS21FMQB 54LS21LMQB
DM54LS21J DM54LS21W DM74LS21M or DM74LS21N
See NS Package Number E20A J14A M14A N14A or W14B
Function Table
Y e ABCD
Inputs Output
A B C D Y
X X X L L
X X L X L
X L X X L
L X X X L
H H H H H
H e High Logic Level
L e Low Logic Level
X e Either Low or High Logic Level
C1995National Semiconductor Corporation RRD-B30M105 Printed in U S A
Absolute Maximum Ratings(Note)
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage7V Input Voltage7V Operating Free Air Temperature Range
DM54LS and54LS b55 C to a125 C DM74LS0 C to a70 C Storage Temperature Range b65 C to a150 C Note The‘‘Absolute Maximum Ratings’’are those values beyond which the safety of the device cannot be guaran-teed The device should not be operated at these limits The parametric values defined in the‘‘Electrical Characteristics’’table 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
DM54LS21DM74LS21
Units Min Nom Max Min Nom Max
V CC Supply Voltage4 555 54 7555 25V V IH High Level Input Voltage22V V IL Low Level Input Voltage0 70 8V I OH High Level Output Current b0 4b0 4mA I OL Low Level Output Current48mA T A Free Air Operating Temperature b55125070 C Electrical Characteristics over recommended operating free air temperature range(unless otherwise noted)
Symbol Parameter Conditions Min
Typ
Max Units (Note1)
V I Input Clamp Voltage V CC e Min I I e b18mA b1 5V V OH High Level Output V CC e Min I OH e Max DM542 53 4
V Voltage V IH e Min DM742 73 4
V OL Low Level Output V CC e Min I OL e Max DM540 250 4 Voltage V IL e Max DM740 350 5V
I OL e4mA V CC e Min DM740 250 4
I I Input Current Max V CC e Max V I e7V
0 1mA
Input Voltage
I IH High Level Input Current V CC e Max V I e2 7V20m A I IL Low Level Input Current V CC e Max V I e0 4V b0 36mA
I OS Short Circuit V CC e Max DM54b20b100
mA Output Current(Note2)DM74b20b100
I CCH Supply Current with V CC e Max
1 2
2 4mA
Outputs High
I CCL Supply Current with V CC e Max
2 24 4mA
Outputs Low
Switching Characteristics at V CC e5V and T A e25 C(See Section1for Test Waveforms and Output Load)
R L e2k X
Symbol Parameter C L e15pF C L e50pF Units
Min Max Min Max
t PLH Propagation Delay Time
413618ns Low to High Level Output
t PHL Propagation Delay Time
311518ns High to Low Level Output
Note1 All typicals are at V CC e5V T A e25 C
Note2 Not more than one output should be shorted at a time and the duration should not exceed one second
2
3
Physical Dimensions inches(millimeters)
Ceramic Leadless Chip Carrier Package(E)
Order Number54LS20LMQB
NS Package Number E20A
14-Lead Ceramic Dual-In-Line Package(J)
Order Number54LS20DMQB or DM54LS21J
NS Package Number J14A
4
Physical Dimensions inches(millimeters)(Continued)
14-Lead Small Outline Molded Package(M)
Order Number DM74LS21M
NS Package Number M14A
14-Lead Molded Dual-In-Line Package(N)
Order Number DM74LS21N
NS Package Number N14A
5
54L S 21 D M 54L S 21 D M 74L S 21D u a l 4-I n p u t A N D G a t e s
Physical Dimensions inches (millimeters)(Continued)
14-Lead Ceramic Flat Package (W)
Order Number 54LS21FMQB or DM54LS21W
NS Package Number W14B
LIFE SUPPORT POLICY
NATIONAL’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 NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or 2 A critical component is any component of a life systems which (a)are intended for surgical implant support device or system whose failure to perform can into the body or (b)support or sustain life and whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system or to affect its safety or with instructions for use provided in the labeling can effectiveness
be reasonably expected to result in a significant injury to the user
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