SN74LS253D [MOTOROLA]
DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS; 双路4输入多路复用器与3态输出
| 型号： | SN74LS253D |
| 厂家： | 
MOTOROLA |
| 描述： | DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
| 文件： | 总5页 (文件大小：169K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54/74LS253
DUAL 4-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
The LSTTL/MSI SN54/74LS253 is a Dual 4-Input Multiplexer with 3-state
outputs. It can select two bits of data from four sources using common select
inputs. The outputs may be individually switched to a high impedance state
DUAL 4-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
with a HIGH on the respective Output Enable (E ) inputs, allowing the outputs
0
to interface directly with bus oriented systems. It is fabricated with the
Schottky barrier diode process for high speed and is completely compatible
with all Motorola TTL families.
LOW POWER SCHOTTKY
• Schottky Process for High Speed
• Multifunction Capability
• Non-Inverting 3-State Outputs
• Input Clamp Diodes Limit High Speed Termination Effects
J SUFFIX
CERAMIC
CASE 620-09
16
1
CONNECTION DIAGRAM DIP (TOP VIEW)
N SUFFIX
PLASTIC
NOTE:
CASE 648-08
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
16
1
D SUFFIX
SOIC
CASE 751B-03
16
1
PIN NAMES
LOADING (Note a)
ORDERING INFORMATION
HIGH
0.5 U.L.
LOW
SN54LSXXXJ
SN74LSXXXN Plastic
SN74LSXXXD SOIC
Ceramic
S , S
Multiplexer A
Common Select Inputs
0.25 U.L.
0
1
E
Output Enable (Active LOW) Input
Multiplexer Inputs
0.5 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
0a
–I
I
0a 3a
Z
a
Multiplexer Output (Note b)
65 (25) U.L. 15 (7.5) U.L.
LOGIC SYMBOL
Multiplexer B
E
Output Enable (Active LOW) Input
Multiplexer Inputs
0.5 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
0b
–I
I
0b 3b
Z
b
Multiplexer Output (Note b)
65 (25) U.L. 15 (7.5) U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 7.5 U.L. for Military (54) and 15 U.L. for Commercial (74)
Temperature Ranges. The Output HIGH drive factor is 25 U.L. for Military (54) and 65 U.L. for
Commercial (74) Temperature Ranges.
FAST AND LS TTL DATA
5-416
SN54/74LS253
LOGIC DIAGRAM
FUNCTIONAL DESCRIPTION
The LS253 contains two identical 4-Input Multiplexers with
3-state outputs. They select two bits from four sources
If the outputs of 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. Designers
should ensure that Output Enable signals to 3-state devices
whose outputs are tied together are designed so that there is
no overlap.
selected by common select inputs (S , S ). The 4-input
0
1
multiplexers have individual Output Enable (E , E ) inputs
0a 0b
which when HIGH, forces the outputs to a high impedance
(high Z) state.
The LS253 is the logic implementation of a 2-pole,
4-position switch, where the position of the switch is deter-
mined by the logic levels supplied to the two select inputs. The
logic equations for the outputs are shown below:
Z = E
(I
0a 0a
S
S + I
S
S
I
S
S + I
S
a
1
0
1a
1
0
2a
1
0
3a
S + I
3b
1
1
S )
0
Z = E
(I
0b 0b
S
S + I
0
S
S
I
S
2b 1
S
b
1
1b
1
0
0
S )
0
TRUTH TABLE
SELECT
INPUTS
OUTPUT
ENABLE
DATA INPUTS
OUTPUT
Z
S
0
S
1
I
0
I
1
I
2
I
3
E
0
X
L
L
H
H
L
L
H
H
X
L
L
L
L
H
H
H
H
X
L
X
X
X
L
H
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
L
H
(Z)
L
H
L
H
L
H
L
L
L
L
L
L
L
L
L
H
X
X
X
X
X
X
H
H
H = HIGH Level
L = LOW Level
X = Irrelevant
(Z) = High Impedance (off)
Address inputs S and S are common to both sections.
0
1
FAST AND LS TTL DATA
5-417
SN54/74LS253
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
Operating Ambient Temperature Range
Output Current — High
Output Current — Low
54
74
–55
0
25
25
125
70
°C
A
I
54
74
–1.0
–2.6
mA
mA
OH
OL
I
54
74
12
24
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
54
74
0.7
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65
3.4
–1.5
V
V
V
V
V
= MIN, I = –18 mA
IN
IK
CC
54
74
2.4
2.4
= MIN, I
OH
= MAX, V = V
IN
CC
IH
OH
or V per Truth Table
IL
3.1
V
V
= V
CC
IL
MIN,
= V or V
IH
54, 74
74
0.25
0.35
0.4
0.5
V
V
I
I
= 12 mA
= 24 mA
CC
IN
OL
V
OL
Output LOW Voltage
per Truth Table
OL
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
12
= 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
14
= 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) See SN54LS251 for Waveforms
A
Limits
Typ
Symbol
Parameter
Propagation Delay,
Unit
Test Conditions
Min
Max
t
t
17
13
25
20
PLH
PHL
ns
Figure 1
Figure 1
Data to Output
t
t
Propagation Delay,
Select to Output
30
21
45
32
C
L
R
L
= 45 pF,
= 667 Ω
PLH
PHL
ns
ns
ns
t
t
15
15
28
23
PZH
PZL
Output Enable Time
Output Disable Time
Figures 4, 5
Figures 3, 5
t
t
27
18
41
27
C
R
= 5.0 pF,
= 667 Ω
PHZ
PLZ
L
L
FAST AND LS TTL DATA
5-418
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
5-419
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