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54LS257A Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. 54LS257A
Description  TRI-STATE Quad 2-Data Selectors/Multiplexers
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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54LS257A Datasheet(HTML) 3 Page - National Semiconductor (TI)

   
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’LS257B Switching Characteristics
at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
From (Input)
RL e 667X
Symbol
Parameter
To (Output)
CL e 45 pF
CL e 150 pF
Units
Min
Max
Min
Max
tPLH
Propagation Delay Time
Data to
18
27
ns
Low to High Level Output
Output
tPHL
Propagation Delay Time
Data to
18
27
ns
High to Low Level Output
Output
tPLH
Propagation Delay Time
Select to
28
35
ns
Low to High Level Output
Output
tPHL
Propagation Delay Time
Select to
35
42
ns
High to Low Level Output
Output
tPZH
Output Enable Time
Output
15
27
ns
to High Level Output
Control to Y
tPZL
Output Enable Time
Output
28
38
ns
to Low Level Output
Control to Y
tPHZ
Output Disable Time from
Output
26
ns
High Level Output (Note 1)
Control to Y
tPLZ
Output Disable Time from
Output
25
ns
Low Level Output (Note 1)
Control to Y
Note 1
CL e 5 pF
Recommended Operating Conditions
Symbol
Parameter
DM54LS258B
DM74LS258B
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
1
b
26
mA
IOL
Low Level Output Current
12
24
mA
TA
Free Air Operating Temperature
b
55
125
0
70
C
’LS258B 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
DM54
24
34
V
Voltage
VIL e Max VIH e Min
DM74
24
31
VOL
Low Level Output
VCC e Min IOL e Max
DM54
025
04
Voltage
VIL e Max VIH e Min
DM74
035
05
V
IOL e 12 mA VCC e Min
DM74
025
04
II
Input Current
Max
VCC e Max
Select
02
mA
Input Voltage
VI e 7V
Other
01
IIH
High Level Input
VCC e Max
Select
40
m
A
Current
VI e 27V
Other
20
3


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