74LVX157SJ [FAIRCHILD]
Low Voltage Quad 2-Input Multiplexer; 低电压四路2输入多路复用器
| 型号： | 74LVX157SJ |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Low Voltage Quad 2-Input Multiplexer |
| 文件： | 总7页 (文件大小：80K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 1993
Revised October 2003
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
I0a–I0d
1a–I1d
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input
I
E
S
Select Input
Za–Zd
Outputs
© 2003 Fairchild Semiconductor Corporation
DS011608
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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-
plied to the Select input. The logic equations for the outputs
are shown below:
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.
Za = E • (I1a • S + I0a • S)
Zb = E • (I1b • S + I0b • S)
Zc = E • (I1c • S + I0c • S)
Zd = E • (I1d • S + I0d • 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
DC Output Voltage (VO)
DC Output Source
−0.5V to 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.
or Sink Current (IO)
±25 mA
DC VCC or Ground Current
(ICC or IGND
)
±50 mA
−65°C to +150°C
180 mW
Storage Temperature (TSTG
Power Dissipation
)
Note 2: Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
T
A = +25°C
TA = −40°C to +85°C
VCC
Symbol
Parameter
Units
Conditions
Min
1.5
2.0
2.4
Typ
Max
Min
1.5
2.0
2.4
Max
VIH
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
Input Voltage
V
VIL
LOW Level
0.5
0.8
0.8
0.5
0.8
0.8
Input Voltage
V
V
VOH
HIGH Level
1.9
2.9
2.0
3.0
1.9
2.9
V
IN = VIL or VIH
I
I
I
I
I
I
OH = −50 µA
Output Voltage
OH = −50 µA
OH = −4 mA
OL = 50 µA
OL = 50 µA
OL = 4 mA
2.58
2.48
VOL
LOW Level
0.0
0.0
0.1
0.1
0.1
0.1
V
IN = V IL or VIH
Output Voltage
V
0.36
±0.1
0.44
±1.0
IIN
Input Leakage Current
µA
µA
V
V
IN = 5.5V or GND
ICC
Quiescent Supply Current
3.6
4.0
40.0
IN = VCC or GND
Noise Characteristics (Note 3)
VCC
TA = 25°C
CL (pF)
Symbol
Parameter
Units
(V)
3.3
3.3
3.3
3.3
Typ
0.3
Limit
0.5
VOLP
VOLV
VIHD
VILD
Quiet Output Maximum Dynamic VOL
Quiet Output Minimum Dynamic VOL
V
V
V
V
50
50
50
50
−0.3
−0.5
2.0
Minimum HIGH Level Dynamic Input Voltage
Maximum LOW Level Dynamic Input Voltage
0.8
Note 3: Input tr = tf = 3ns
3
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AC Electrical Characteristics
VCC
T
A = +25°C
TA = −40°C to +85°C
C
L (pF)
Symbol
Parameter
Units
(V)
Min
Typ
6.6
9.1
5.1
7.6
8.9
11.4
7.0
9.5
9.1
11.6
7.2
9.7
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
1.0
Max
15.5
19.0
9.5
tPLH
Propagation
Delay Time
n to Zn
2.7
15
50
15
50
15
50
15
50
15
50
15
50
50
tPHL
ns
I
3.3 ± 0.3
2.7
11.4
16.9
20.4
11.0
14.5
17.6
21.1
11.5
15.0
1.5
13.0
20.5
24.0
13.0
16.5
20.5
24.0
13.5
17.0
1.5
tPLH
tPHL
Propagation
Delay Time
S to Zn
ns
3.3 ± 0.3
2.7
tPLH
tPHL
Propagation
Delay Time
E to Zn
ns
ns
3.3 ± 0.3
tOSHL
tOSLH
Output to Output
Skew (Note 4)
2.7
3.3
1.5
1.5
Note 4: Parameter guaranteed by design.
tOSLH = |tPLHm − tPLHn|.
t
OSHL = |tPHLm − tPHLn|.
Capacitance
T
A = +25°C
TA = −40°C to +85°C
Symbol
Parameter
Units
Min
Typ
4
Max
10
Min
Max
CIN
Input Capacitance
Power Dissipation Capacitance (Note 5)
10
pF
pF
CPD
20
Note 5: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load.
Average operating current can be obtained by the equation: ICC(opr.) = CPD × VCC × fIN + ICC
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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 Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC16
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.
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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
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instructions for use provided in the labeling, can be rea-
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user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
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