SN74LS251JD [MOTOROLA]
LS SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, CDIP16, CERAMIC, DIP-16;
| 型号： | SN74LS251JD |
| 厂家： | 
MOTOROLA |
| 描述： | LS SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, CDIP16, CERAMIC, DIP-16 解复用器 逻辑集成电路 光电二极管 输出元件 输入元件 |
| 文件： | 总6页 (文件大小：184K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54/74LS251
8-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
The TTL/MSI SN74LS251 is a high speed 8-Input Digital Multiplexer. It
provides, in one package, the ability to select one bit of data from up to eight
sources. The LS251 can be used as a universal function generator to
generate any logic function of four variables. Both assertion and negation
outputs are provided.
8-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
• Schottky Process for High Speed
• Multifunction Capability
• On-Chip Select Logic Decoding
• Inverting and Non-Inverting 3-State Outputs
• Input Clamp Diodes Limit High Speed Termination Effects
J SUFFIX
CERAMIC
CASE 620-09
CONNECTION DIAGRAM DIP (TOP VIEW)
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
16
PIN NAMES
LOADING (Note a)
1
HIGH
LOW
S –S
Select Inputs
Output Enable (Active LOW) Inputs
Multiplexer Inputs
Multiplexer Output
Complementary Multiplexer Output
0.5 U.L.
0.5 U.L.
0.5 U.L.
65 U.L.
65 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
15 U.L.
0
2
E
0
I –I
0
7
ORDERING INFORMATION
Z
Z
SN54LSXXXJ
Ceramic
15 U.L.
NOTES:
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
a. 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
LOGIC DIAGRAM
FAST AND LS TTL DATA
5-410
SN54/74LS251
FUNCTIONAL DESCRIPTION
The LS251 is a logical implementation of a single pole,
8-position switch with the switch position controlled by the
When the Output Enable is HIGH, both outputs are in the
high impedance (high Z) state. This feature allows multiplexer
expansion by tying the outputs of up to 128 devices together.
When the outputs of the 3-state devices are tied together, all
but one device must be in the high impedance state to avoid
high currents that would exceed the maximum ratings. The
Output Enable signals should be designed to ensure there is
no overlap in the active LOW portion of the enable voltage.
state of three Select inputs, S , S , S . Both assertion and
0
1
2
negation outputs are provided. The Output Enable input (E )
O
is active LOW. When it is activated, the logic function provided
at the output is:
Z = E
Z = E
Z = E
(I
S
S
S
S + I
S
S
S + I
S
S
0 1
O
O
O
0
2
1
0
3
2
1
0
6
2
1
0
1
2
2
S + I
S
S
S
S + I
S
S
S
S
S + I
S
S
1
0
2
4
0
1
2
5 0
S + I
S + I
S ).
1
2
7
0
1 2
TRUTH TABLE
E
0
S
2
S
1
S
0
I
0
I
1
I
2
I
3
I
4
I
5
I
6
I
7
Z
Z
H
X
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
X
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
X
L
L
H
H
L
X
L
X
X
X
L
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
(Z)
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
(Z)
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
X
X
X
X
X
X
X
X
X
X
X
X
L
H
H
L
L
H
H
L
L
H
H
H
X
X
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
(Z) = High impedance (Off)
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
4.75
0
Typ
5.0
25
Max
5.25
70
Unit
V
V
CC
Supply Voltage
T
Operating Ambient Temperature Range
Output Current — High
°C
A
I
I
–2.6
24
mA
mA
OH
Output Current — Low
OL
FAST AND LS TTL DATA
5-411
SN54/74LS251
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
V
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65
3.1
–1.5
V
V
= MIN, I = –18 mA
IN
IK
CC
= MIN, I
OH
= MAX, V = V
IN
CC
IH
2.4
OH
or V per Truth Table
IL
V
V
= V
CC
IL
MIN,
= V or V
IH
0.25
0.35
0.4
0.5
V
V
I
I
= 12 mA
= 24 mA
CC
IN
OL
OL
V
OL
Output LOW Voltage
per Truth Table
I
I
Output Off Current HIGH
Output Off Current LOW
20
–20
20
µA
µA
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= MAX, V
= MAX, V
= 2.7 V
= 0.4 V
OZH
OUT
OZL
OUT
µA
= MAX, V = 2.7 V
IN
I
IH
Input HIGH Current
0.1
mA
mA
mA
mA
mA
= MAX, V = 7.0 V
IN
I
I
Input LOW Current
–0.4
–130
10
= MAX, V = 0.4 V
IN
IL
Short Circuit Current (Note 1)
–30
= MAX
OS
= MAX, V = 0 V
E
I
Power Supply Current
CC
12
= MAX, V = 4.5 V
E
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T = 25°C, V
CC
= 5.0 V)
A
Limits
Typ
Symbol
Parameter
Propagation Delay,
Unit
Test Conditions
Min
Max
t
t
20
21
33
33
PLH
PHL
ns
Figure 1
Figure 2
Figure 1
Figures 2
Select to Z Output
t
t
Propagation Delay,
Select to Z Output
29
28
45
45
PLH
PHL
ns
ns
ns
ns
ns
ns
ns
t
t
Propagation Delay,
Data to Z Output
10
9.0
15
15
PLH
PHL
C
R
= 15 pF,
= 2.0 kΩ
L
L
t
t
Propagation Delay,
Data to Z Output
17
18
28
28
PLH
PHL
t
t
Output Enable Time
to Z Output
17
24
27
40
PZH
PZL
Figures 4, 5
Figures 3, 5
Figures 3, 5
Figures 4, 5
t
t
Output Enable Time
to Z Output
30
26
45
40
PZH
PZL
t
t
Output Disable Time
to Z Output
37
15
55
25
PHZ
PLZ
C
R
= 5.0 pF,
= 667 kΩ
L
L
t
t
Output Disable Time
to Z Output
30
15
45
25
PHZ
PLZ
FAST AND LS TTL DATA
5-412
SN54/74LS251
3-STATE AC WAVEFORMS
Figure 1
Figure 2
≥
≈
≈
Figure 3
Figure 4
AC LOAD CIRCUIT
SWITCH POSITIONS
SYMBOL
SW1
Open
SW2
Closed
Open
t
PZH
t
Closed
Closed
Closed
PZL
PLZ
PHZ
t
Closed
Closed
t
Ω
* Includes Jig and Probe Capacitance.
Figure 5
FAST AND LS TTL DATA
5-413
Case 751B-03 D Suffix
16-Pin Plastic
SO-16
-A-
16
1
9
8
P
C
-B-
R X 45°
G
-T-
J
M
F
D
°
°
°
°
K
Case 648-08 N Suffix
16-Pin Plastic
-A-
16
1
9
B
S
8
F
L
C
K
-T-
M
H
J
G
D
°
°
°
°
Case 620-09 J Suffix
16-Pin Ceramic Dual In-Line
-A-
16
9
-B-
1
8
L
C
-T-
K
M
N
E
J
F
G
D
°
°
°
°
FAST AND LS TTL DATA
5-414
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◊
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