74LVX157MX [ETC]
2-Input Digital Multiplexer ; 2 ，输入数字多路复用器\n
| 型号： | 74LVX157MX |
| 厂家： | 
ETC |
| 描述： | 2-Input Digital Multiplexer
|
| 文件： | 总6页 (文件大小：60K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 1993
Revised March 1999
74LVX157
Low Voltage Quad 2-Input Multiplexer
General Description
Features
The LVX157 is a high-speed quad 2-input multiplexer. Four
bits of data from two sources can be selected using the
common Select and Enable inputs. The four outputs
present the selected data in the true (noninverted) form.
The LVX157 can also be used as a function generator.
■ Input voltage level translation from 5V to 3V
■ Ideal for low power/low noise 3.3V applications
■ Guaranteed simultaneous switching noise level and
dynamic threshold performance
Ordering Code:
Order Number Package Number
Package Description
74LVX157M
M16A
M16D
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
74LVX157SJ
74LVX157MTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices are also available in Tape and Reel. Specify by appending letter suffix “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
Description
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input
I0a–I0d
I1a–I1d
E
S
Select Input
Za–Zd
Outputs
© 1999 Fairchild Semiconductor Corporation
DS011608.prf
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Truth Table
Inputs
Outputs
Z
E
S
I0
I1
H
L
L
L
L
X
H
H
L
X
X
X
L
X
L
L
L
H
X
X
H
L
L
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Functional Description
The LVX157 is a quad 2-input multiplexer. It selects four
bits of data from two sources under the control of a com-
mon Select input (S). The Enable input (E) is active-LOW.
When E is HIGH, all of the outputs (Z) are forced LOW
regardless of all other inputs. The LVX157 is the logic
implementation of a 4-pole, 2-position switch where the
position of the switch is determined by the logic levels sup-
Z
Z
c = E • (I1c • S + I0c • S)
d = E • (I1d • S + I0d • S)
A common use of the LVX157 is the moving of data from
two groups of registers to four common output busses. The
particular register from which the data comes is determined
by the state of the Select input. A less obvious use is as a
function generator. The LVX157 can generate any four of
the sixteen different functions of two variables with one
variable common. This is useful for implementing gating
functions.
plied to the Select input. The logic equations for the outputs
are shown below:
Za = E • (I1a • S + I0a • S)
Zb = E • (I1b • S + I0b • S)
Logic Diagram
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2
Absolute Maximum Ratings(Note 1)
Recommended Operating
Conditions (Note 2)
Supply Voltage (VCC
)
−0.5V to +7.0V
DC Input Diode Current (IIK
VI = −0.5V
)
Supply Voltage (VCC
)
2.0V to 3.6V
0V to 5.5V
−20 mA
Input Voltage (VI)
DC Input Voltage (VI)
−0.5V to 7V
Output Voltage (VO)
0V to VCC
DC Output Diode Current (IOK
)
Operating Temperature (TA)
Input Rise and Fall Time (∆t/∆V)
−40°C to +85°C
0 ns/V to 100 ns/V
V
V
O = −0.5V
−20 mA
+20 mA
O = VCC + 0.5V
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.
DC Output Voltage (VO)
DC Output Source
−0.5V to VCC + 0.5V
or Sink Current (IO)
±25 mA
DC VCC or Ground Current
Note 2: Unused inputs must be held HIGH or LOW. They may not float.
(ICC or IGND
)
±50 mA
−65°C to +150°C
180 mW
Storage Temperature (TSTG
Power Dissipation
)
DC Electrical Characteristics
T
= +25°C
T = −40°C to +85°C
A
A
V
Symbol
Parameter
Units
Conditions
CC
Min
1.5
2.0
2.4
Typ
Max
Min
1.5
2.0
2.4
Max
V
HIGH Level
2.0
3.0
3.6
2.0
3.0
3.6
2.0
3.0
3.0
2.0
3.0
3.0
3.6
IH
Input Voltage
V
V
V
V
LOW Level
0.5
0.8
0.8
0.5
0.8
0.8
IL
Input Voltage
V
V
HIGH Level
1.9
2.9
2.0
3.0
1.9
2.9
V
= V or V I
IH OH
= −50 µA
= −50 µA
= −4 mA
= 50 µA
= 50 µA
= 4 mA
OH
OL
IN
IL
Output Voltage
I
I
OH
OH
2.58
2.48
LOW Level
0.0
0.0
0.1
0.1
0.1
0.1
V
= V or V I
IH OL
IN
IL
Output Voltage
V
I
I
OL
OL
0.36
±0.1
0.44
±1.0
I
I
Input Leakage Current
µA
µA
V
V
= 5.5V or GND
IN
IN
Quiescent Supply Current
3.6
4.0
40.0
= V or GND
CC
CC
IN
Noise Characteristics (Note 3)
T
= 25°C
V
(V)
A
CC
C
(pF)
Symbol
Parameter
Quiet Output Maximum Dynamic V
Units
L
Typ
Limit
0.5
V
V
V
V
3.3
3.3
3.3
3.3
0.3
V
V
V
V
50
OLP
OLV
IHD
ILD
OL
Quiet Output Minimum Dynamic V
−0.3
−0.5
2.0
50
50
50
OL
Minimum HIGH Level Dynamic Input Voltage
Maximum LOW Level Dynamic Input Voltage
0.8
Note 3: Input t = t = 3ns
r
f
3
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AC Electrical Characteristics
T
= +25°C
T = −40°C to +85°C
A
V
(V)
A
CC
C
(pF)
Symbol
Parameter
Units
L
Min
Typ
6.6
9.1
5.1
7.6
8.9
11.4
7.0
9.5
9.1
11.6
7.2
Max
12.5
16.0
7.9
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max
15.5
19.0
9.5
t
t
Propagation
Delay Time
to Z
2.7
3.3 ± 0.3
2.7
15
PLH
PHL
50
15
50
15
50
15
50
15
50
15
ns
I
n
n
11.4
16.9
20.4
11.0
14.5
17.6
21.1
11.5
13.0
20.5
24.0
13.0
16.5
20.5
24.0
13.5
t
t
Propagation
Delay Time
PLH
PHL
ns
S to Z
3.3 ± 0.3
2.7
n
t
t
Propagation
Delay Time
PLH
PHL
ns
ns
3.3 ± 0.3
E to Z
n
9.7
15.0
1.5
1.0
17.0
1.5
50
50
t
t
Output to Output
Skew (Note 4)
2.7
3.3
OSHL
OSLH
1.5
1.5
Note 4: Parameter guaranteed by design.
t
t
= |t
= |t
− t
− t
|.
|.
OSLH
OSHL
PLHm
PHLm
PLHn
PHLn
Capacitance
T
= +25°C
T = −40°C to +85°C
A
A
Symbol
Parameter
Units
Min
Typ
4
Max
10
Min
Max
C
C
Input Capacitance
Power Dissipation Capacitance (Note 5)
10
pF
pF
IN
20
PD
Note 5: C is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load.
PD
Average operating current can be obtained by the equation: I
= C × V × f + I
PD CC IN CC
CC(opr.)
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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
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M16D
5
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC16
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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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.
相关型号：
74LVX157MX_NL
Multiplexer, LV/LV-A/LVX/H Series, 4-Func, 2 Line Input, 1 Line Output, True Output, CMOS, PDSO16, 0.150 INCH, MS-012, SOIC-16
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