DM74LS258 [NSC]
TRI-STATE Quad 2-Data Selectors/Multiplexers; TRI- STATE四2数据选择器/多路复用器
| 型号： | DM74LS258 |
| 厂家： | 
National Semiconductor |
| 描述： | TRI-STATE Quad 2-Data Selectors/Multiplexers |
| 文件： | 总8页 (文件大小：166K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1989
54LS257A/DM54LS257B/DM74LS257B,
54LS258A/DM54LS258B/DM74LS258B
TRI-STATE Quad 2-Data Selectors/Multiplexers
Features
Y
É
General Description
TRI-STATE versions LS157 and LS158 with same pin-
outs
These Schottky-clamped high-performance multiplexers
feature TRI-STATE outputs that can interface directly with
data lines of bus-organized systems. With all but one of the
common outputs disabled (at a high impedance state), the
low impedance of the single enabled output will drive the
bus line to a high or low logic level. To minimize the possibil-
ity that two outputs will attempt to take a common bus to
opposite logic levels, the output enable circuitry is designed
such that the output disable times are shorter than the out-
put enable times.
Y
Y
Schottky-clamped for significant improvement in A-C
performance
Provides bus interface from multiple sources in high-
performance systems
Y
Y
Average propagation delay from data input 12 ns
Typical power dissipation
LS257B 50 mW
LS258B 35 mW
This TRI-STATE output feature means that n-bit (paralleled)
data selectors with up to 258 sources can be implemented
for data buses. It also permits the use of standard TTL reg-
isters for data retention throughout the system.
Y
Alternate military/aerospace devices (54LS257A/
54LS258A) are available. Contact a National Semicon-
ductor Sales Office/Distributor for specifications.
Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
TL/F/6417–2
Order Number 54LS258ADMQB, 54LS258AFMQB,
54LS258ALMQB, DM54LS258BJ, DM54LS258BW,
DM74LS258BM or DM74LS258BN
TL/F/6417–1
Order Number 54LS257ADMQB, 54LS257AFMQB,
54LS257ALMQB, DM54LS257BJ, DM54LS257BW,
DM74LS257BM or DM74LS257BN
See NS Package Number E20A, J16A,
M16A, N16E or W16A
See NS Package Number E20A, J16A,
M16A, N16E or W16A
Function Table
Inputs
Output
Control
Output Y
Select
A
B
LS257 LS258
H
L
L
L
L
X
L
L
H
H
X
L
H
X
X
X
X
X
L
Z
L
H
L
Z
H
L
H
L
H
H
e
e
e
High Impedance (off)
e
Low Level, X Don’t Care,
H
Z
High Level, L
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/F/6417
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.
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.
Supply Voltage
Input Voltage
7V
7V
Operating Free Air Temperature Range
DM54LS and 54LS
DM74LS
b
b
a
a
55 C to 125 C
§
§
0 C to 70 C
§
§
a
65 C to 150 C
Storage Temperature Range
§
§
Recommended Operating Conditions
DM54LS257B
DM74LS257B
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Nom
Max
V
V
V
Supply Voltage
5
5.5
5
5.25
V
V
CC
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
IH
0.7
0.8
V
IL
b
b
I
I
1
2.6
mA
mA
OH
OL
12
24
b
T
A
55
125
0
70
C
§
’LS257B Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Typ
(Note 1)
Symbol
Parameter
Conditions
Min
Max
Units
e
e
e b
e
b
1.5
V
V
Input Clamp Voltage
V
Min, I
Min, I
18 mA
V
V
I
CC
I
High Level Output
Voltage
V
V
Max
Min
DM54
DM74
DM54
DM74
DM74
Select
Other
Select
Other
Select
Other
2.4
2.4
3.4
3.1
OH
CC
OH
e
e
Max, V
IL
IH
e
e
e
V
OL
Low Level Output
Voltage
V
V
Min, I
Max
Min
0.25
0.35
0.25
0.4
CC
OL
e
Max, V
IH
IL
0.5
0.4
0.2
0.1
40
V
e
e
Min
I
12 mA, V
OL
CC
@
Input Current Max
Input Voltage
e
CC
I
I
I
I
V
V
Max,
7V
I
mA
mA
mA
e
I
e
2.7V
High Level Input
Current
V
V
Max,
IH
CC
e
I
20
e
0.4V
b
Low Level Input
Current
V
V
Max,
0.8
0.4
IL
CC
e
I
b
e
e
Off-State Output Current
with High Level Output
Voltage Applied
V
CC
V
IH
Max, V
O
2.7V
OZH
e
e
Min, V
IL
Max
20
mA
e
e
0.4V
I
I
Off-State Output Current
with Low Level Output
Voltage Applied
V
V
Max, V
O
OZL
OS
CC
IH
e
e
b
20
Min, V
Max
mA
IL
e
(Note 2)
b
b
b
b
Short Circuit
Output Current
V
CC
Max
DM54
DM74
20
20
100
100
mA
e
e
e
I
I
I
Supply Current with
Outputs High
V
CC
V
CC
V
CC
Max (Note 3)
Max (Note 3)
Max (Note 3)
CCH
CCL
CCZ
5.9
9.2
12
10
16
19
mA
mA
mA
Supply Current with
Outputs Low
Supply Current with
Outputs Disabled
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
CC
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3: I is measured with all outputs open and all possible inputs grounded, while achieving the stated output conditions.
A
CC
2
’LS257B Switching Characteristics
5V and T
e
e
A
at V
25 C (See Section 1 for Test Waveforms and Output Load)
§
CC
e
R
L
667X
From (Input)
e
e
L
Symbol
Parameter
C
45 pF
Max
C
150 pF
Max
Units
To (Output)
L
Min
Min
t
t
t
t
t
t
t
t
Propagation Delay Time
Low to High Level Output
Data to
Output
PLH
PHL
PLH
PHL
PZH
PZL
PHZ
PLZ
18
18
28
35
15
28
26
25
27
27
35
42
27
38
ns
ns
ns
ns
ns
ns
ns
ns
Propagation Delay Time
High to Low Level Output
Data to
Output
Propagation Delay Time
Low to High Level Output
Select to
Output
Propagation Delay Time
High to Low Level Output
Select to
Output
Output Enable Time
to High Level Output
Output
Control to Y
Output Enable Time
to Low Level Output
Output
Control to Y
Output Disable Time from
High Level Output (Note 1)
Output
Control to Y
Output Disable Time from
Low Level Output (Note 1)
Output
Control to Y
e
Note 1: C
5 pF.
L
Recommended Operating Conditions
DM54LS258B
DM74LS258B
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Nom
Max
V
V
V
Supply Voltage
5
5.5
5
5.25
V
V
CC
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
IH
0.7
0.8
V
IL
b
b
I
I
1
2.6
mA
mA
OH
OL
12
24
b
T
A
55
125
0
70
C
§
’LS258B Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
(Note 1)
e
e
e b
e
b
1.5
V
V
Input Clamp Voltage
V
Min, I
Min, I
18 mA
V
V
I
CC
I
High Level Output
Voltage
V
V
Max
Min
DM54
DM74
DM54
DM74
DM74
Select
Other
Select
Other
2.4
2.4
3.4
3.1
OH
CC
OH
e
e
Max, V
IL
IH
e
e
e
V
OL
Low Level Output
Voltage
V
V
Min, I
Max
Min
0.25
0.35
0.25
0.4
CC
OL
e
Max, V
IH
IL
0.5
0.4
0.2
0.1
40
V
e
e
I
12 mA, V
Min
OL
CC
@
Input Current Max
e
CC
I
I
V
Max,
I
mA
e
Input Voltage
V
I
7V
e
High Level Input
Current
V
V
Max,
IH
CC
mA
e
2.7V
I
20
3
’LS258B Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) (Continued)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
(Note 1)
e
CC
b
b
I
I
Low Level Input
Current
V
Max,
Select
Other
0.8
0.4
IL
mA
e
V
I
0.4V
e
e
e
Off-State Output Current
with High Level Output
Voltage Applied
V
V
Max, V
2.7V
0.4V
OZH
CC
O
e
Min, V
IL
Max
20
mA
IH
e
Max, V
e
I
I
Off-State Output Current
with Low Level Output
Voltage Applied
V
V
OZL
OS
CC
O
e
e
b
20
Min, V
Max
mA
IH
IL
e
(Note 2)
b
b
b
b
Short Circuit
V
CC
Max
DM54
DM74
20
20
100
100
mA
Output Current
e
e
e
I
I
I
Supply Current with
Outputs High
V
CC
V
CC
V
CC
Max (Note 3)
Max (Note 3)
Max (Note 3)
CCH
CCL
CCZ
4.1
9
7
mA
mA
mA
Supply Current with
Outputs Low
14
19
Supply Current with
Outputs Disabled
12
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
CC
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3: I is measured with all outputs open and all possible inputs grounded, while achieving the stated output conditions.
A
CC
’LS258B Switching Characteristics
5V and T
e
e
A
at V
25 C (See Section 1 for Test Waveforms and Output Load)
§
CC
e
R
667X
L
From (Input)
e
e
L
Symbol
Parameter
C
45 pF
Max
C
150 pF
Max
Units
To (Output)
L
Min
Min
t
t
t
t
t
t
t
t
Propagation Delay Time
Low to High Level Output
Data to
Output
PLH
PHL
PLH
PHL
PZH
PZL
PHZ
PLZ
18
18
28
35
15
28
26
25
27
27
35
42
27
38
ns
ns
ns
ns
ns
ns
ns
ns
Propagation Delay Time
High to Low Level Output
Data to
Output
Propagation Delay Time
Low to High Level Output
Select to
Output
Propagation Delay Time
High to Low Level Output
Select to
Output
Output Enable Time
to High Level Output
Output
Control to Y
Output Enable Time
to Low Level Output
Output
Control to Y
Output Disable Time from
High Level Output (Note 4)
Output
Control to Y
Output Disable Time from
Low Level Output (Note 4)
Output
Control to Y
e
Note 4: C
5 pF.
L
4
Logic Diagrams
LS257B
TL/F/6417–3
LS258B
TL/F/6417–4
5
Physical Dimensions inches (millimeters)
Ceramic Leadless Chip Carrier Package (E)
Order Number 54LS257ALMQB or 54LS258ALMQB
NS Package Number E20A
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 54LS257ADMQB, 54LS258ADMQB, DM54LS257BJ or DM54LS258BJ
NS Package Number J16A
6
Physical Dimensions inches (millimeters) (Continued)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS257BM or DM74LS258BM
NS Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS257BN or DM74LS258BN
NS Package Number N16E
7
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 54LS257AFMQB or 54LS258AFMQB
NS Package Number W16A
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to the user.
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support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
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