DM74ALS251SJX [FAIRCHILD]
8-Input Digital Multiplexer ; 8输入数字多路复用器\n
| 型号： | DM74ALS251SJX |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | 8-Input Digital Multiplexer
|
| 文件： | 总7页 (文件大小：79K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
April 1984
Revised April 2000
DM74ALS251
3-STATE 1-of-8 Line Data Selector/Multiplexer
General Description
Features
This Data Selector/Multiplexer contains full on-chip decod-
ing to select one-of-eight data sources as a result of a
unique three-bit binary code at the Select inputs. Two com-
plementary outputs provide both inverting and non-invert-
ing buffer operation. An Output Control input is provided
which, when at the high level, places both outputs in the
high impedance OFF-State. In order to prevent bus access
conflicts, output disable times are shorter than output
enable times. The Select input buffers incorporate internal
overlap features to ensure that select input changes do not
cause invalid output transients.
■ Advanced oxide-isolated, ion-implanted Schottky TTL
process
■ Switching performance is guaranteed over full tempera-
ture and VCC supply range
■ Pin and functional compatible with LS family counterpart
■ Improved output transient handling capability
■ Output control circuitry incorporates power-up 3-STATE
feature
Ordering Code:
Order Number Package Number
Package Description
DM74ALS251M
DM74ALS251SJ
DM74ALS251N
M16A
M16D
N16E
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Inputs
Outputs
Select
Strobe
C
X
L
B
X
L
A
X
L
S
H
L
L
L
L
L
L
L
L
Y
W
Z
Z
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
L
L
H
L
L
H
H
L
L
H
L
H
H
H
H
L
H
L
H
H
H
H = HIGH Level
L = LOW Level
X = Don't Care
Z = High Impedance (OFF)
D0 thru D7 = The Level of the Respective D Input
© 2000 Fairchild Semiconductor Corporation
DS006214
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Logic Diagram
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2
Absolute Maximum Ratings(Note 1)
Supply Voltage, VCC
7V
7V
Input Voltage
Voltage Applied to Disabled Output
5.5V
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Operating Free Air Temperature Range
Storage Temperature Range
Typical θJA
0°C to +70°C
−65°C to +150°C
N Package
78.0°C/W
M Package
107.0°C/W
Recommended Operating Conditions
Symbol
Parameter
Min
4.5
2
Nom
Max
Units
V
VCC
VIH
VIL
IOH
IOL
TA
Supply Voltage
5
5.5
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
V
0.8
−2.6
24
V
mA
mA
°C
0
70
Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C.
Symbol
VIK
Parameter
Input Clamp Voltage
HIGH Level
Conditions
CC = 4.5V, IIN = −18 mA
CC = 4.5V, IOH = Max
Min
Typ
Max
Units
V
V
−1.5
V
V
V
VOH
VOL
II
2.4
3.2
Output Voltage
I
OH = −400 µA, VCC = 4.5V to 5.5V
VCC−2
LOW Level
VCC = 4.5V
I
OL = 24 mA
0.35
0.5
0.1
V
Output Voltage
Input Current at Maximum
Input Voltage
VCC = 5.5V, VIH = 7V
mA
IIH
HIGH Level Input Current
LOW Level Input Current
Output Drive Current
OFF-State Output
Current, HIGH Bias
OFF-State Output
Current, LOW Bias
Supply Current
V
V
V
CC = 5.5V, VIH = 2.7V
CC = 5.5V, VIN = 0.4V
CC = 5.5V, VOUT = 2.25V
20
µA
mA
mA
IIL
−0.1
−112
IO
−30
IOZH
VCC = 5.5V, VOUT = 2.7V
20
µA
µA
IOZL
V
CC = 5.5V, VOUT = 0.4V
CC = 5.5V, Inputs = GND
−20
ICC
V
Enabled
Disabled
7
10
14
mA
Inputs = 4.5V, VCC = 5.5V
9.4
3
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Switching Characteristics
over recommended operating free air temperature range
Symbol
Parameter
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Output Enable Time
to HIGH Level
Conditions
From
To
Min
Max
Units
tPLH
V
CC = 4.5V to 5.5V
Select
5
18
ns
CL = 50 pF
Y
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPZH
tPZL
tPHZ
tPLZ
tPHZ
tPLZ
RL = 500Ω
Select
Select
8
8
7
2
3
3
3
3
3
3
3
2
1
2
1
24
24
23
10
15
15
15
15
15
15
15
10
10
10
10
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
W
Y
Select
Data
Data
Data
W
Y
Data
Output Control
Output Control
Output Control
Output Control
Output Control
Output Control
Output Control
Output Control
Output Enable Time
to LOW Level
Output Enable Time
to HIGH Level
W
Y
Output Enable Time
to LOW Level
Output Disable Time
from HIGH Level
Output Disable Time
from LOW Level
Output Disable Time
from HIGH Level
W
Output Disable Time
from LOW Level
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4
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
Package Number M16A
5
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M16D
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6
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N16E
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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