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DM74LS256N 数据表(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 DM74LS256N
功能描述  Dual 4-Bit Addressable Latch
Download  6 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

DM74LS256N 数据表(HTML) 3 Page - National Semiconductor (TI)

  DM74LS256N Datasheet HTML 1Page - National Semiconductor (TI) DM74LS256N Datasheet HTML 2Page - National Semiconductor (TI) DM74LS256N Datasheet HTML 3Page - National Semiconductor (TI) DM74LS256N Datasheet HTML 4Page - National Semiconductor (TI) DM74LS256N Datasheet HTML 5Page - National Semiconductor (TI) DM74LS256N Datasheet HTML 6Page - National Semiconductor (TI)  
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Absolute Maximum Ratings (Note)
If MilitaryAerospace specified devices are required
please contact the National Semiconductor Sales
OfficeDistributors for availability and specifications
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
54LS
b
55 Cto a125 C
DM74LS
0 Cto a70 C
Storage Temperature Range
b
65 Cto 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
54LS256
DM74LS256
Units
Min
Nom
Max
Min
Nom
Max
VCC
Supply Voltage
45
5
55
475
5
525
V
VIH
High Level Input Voltage
2
2
V
VIL
Low Level Input Voltage
07
08
V
IOH
High Level Output Current
b
04
b
04
mA
IOL
Low Level Output Current
4
8
mA
TA
Free Air Operating Temperature
b
55
125
0
70
C
ts (H)
Setup Time HIGH Dn to E
20
20
ns
th (H)
Hold Time HIGH Dn to E
00
ns
ts (L)
Setup Time LOW Dn to E
15
15
ns
th (L)
Hold Time LOW Dn to E
00
ns
ts (H)
Setup Time HIGH or LOW
00
ns
ts (L)
An to E
tw (L)
E Pulse Width LOW
17
17
ns
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 1)
VI
Input Clamp Voltage
VCC e Min II eb18 mA
b
15
V
VOH
High Level Output
VCC e Min IOH e Max
54LS
25
V
Voltage
VIL e Max
DM74
27
34
VOL
Low Level Output
VCC e Min IOL e Max
54LS
04
Voltage
VIH e Min
DM74
035
05
V
IOL e 4 mA VCC e Min
DM74
025
04
II
Input Current
Max
VCC e Max VI e 10V
Inputs
01
mA
Input Voltage
E
02
IIH
High Level Input Current
VCC e Max VI e 27V
Inputs
20
m
A
E
40
IIL
Low Level Input Current
VCC e Max VI e 04V
Inputs
b
04
mA
E
b
08
IOS
Short Circuit
VCC e Max
54LS
b
20
b
100
mA
Output Current
(Note 2)
DM74
b
20
b
100
ICC
Supply Current
VCC e Max
25
mA
Note 1
All typicals are at VCC e 5V TA e 25 C
Note 2
Not more than one output should be shorted at a time and the duration should not exceed one second
3


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