74LVX157_04资料

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August 2004
s
HIGH SPEED:
t PD = 5.1 ns (TYP .) at V CC = 3.3V s 5V TOLERANT INPUTS s
INPUT VOLTAGE LEVEL:V IL =0.8V, V IH =2V at V CC =3V s
LOW POWER DISSIPATION:I CC = 2 µA (MAX.) at T A =25°C s
LOW NOISE:
V OLP = 0.3V (TYP .) at V CC = 3.3V
s
SYMMETRICAL OUTPUT IMPEDANCE:|I OH | = I OL = 4mA (MIN)
s
BALANCED PROPAGATION DELAYS:t PLH ≅ t PHL
s
OPERATING VOLTAGE RANGE:
V CC (OPR) = 2V to 3.6V (1.2V Data Retention)s
PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 157
s IMPROVED LATCH-UP IMMUNITY
s
POWER DOWN PROTECTION ON INPUTS
DESCRIPTION
The 74LVX157 is a low voltage CMOS QUAD 2CHANNEL MULTIPLEXER fabricated with sub-micron silicon gate and double-layer metal wiring C 2MOS technology. It is ideal for low power, battery operated and low noise 3.3V applications.
It consists of four 2-input digital multiplexers with common select and strobe inputs. When STROBE input is held high, selection of data is inhibited and all the outputs become low. The SELECT decoding determines whether the A or B inputs get routed to their corresponding Y outputs.
Power down protection is provided on all inputs and 0 to 7V can be accepted on inputs with no regard to the supply voltage.
This device can be used to interface 5V to 3V system. It combines high speed performance with the true CMOS low power consumption.
All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
74LVX157
LOW VOLTAGE QUAD 2 CHANNEL MULTIPLEXER
WITH 5V TOLERANT INPUTS
Table 1: Order Codes
PACKAGE T & R SOP 74LVX157MTR TSSOP
74LVX157TTR
74LVX157
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Figure 2: Input Equivalent Circuit
Table 2: Pin Description
Table 3: Truth Table
X : Don’t Care
Table 4: Absolute Maximum Ratings
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
Table 5: Recommended Operating Conditions
1) Truth Table guaranteed: 1.2V to 3.6V 2) V IN
from 0.8V to 2.0V
PIN N°SYMBOL NAME AND FUNCTION 1SELECT Common Data Select Inputs
2, 5, 11, 141A to 4A Data Inputs From Source A
3, 6, 10, 131B to 4B Data Inputs From Source B
4, 7, 9, 12
1Y to 4Y Multiplexer Outputs 15STROBE Strobe Input 8GND Ground (0V)
16
V CC
Positive Supply Voltage
INPUTS
OUTPUT
STROBE
SELECT
A B Y H X X X L L L L X L L L H X H L H X L L L
H
X
H
H
Symbol Parameter
Value Unit V CC Supply Voltage -0.5 to +7.0V V I DC Input Voltage -0.5 to +7.0V V O DC Output Voltage -0.5 to V CC + 0.5
V I IK DC Input Diode Current - 20mA I OK DC Output Diode Current ± 20mA I O
DC Output Current
± 25mA I CC or I GND DC V CC or Ground Current
± 50mA T stg
Storage Temperature -65 to +150
°C T L
Lead Temperature (10 sec)
300
°C
Symbol Parameter
Value Unit V CC Supply Voltage (note 1) 2 to 3.6V V I Input Voltage 0 to 5.5V V O Output Voltage 0 to V CC V T op Operating Temperature
-55 to 125°C dt/dv
Input Rise and Fall Time (note 2) (V CC = 3.3V)
0 to 100
ns/V
74LVX157
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Table 6: DC Specifications
Table 7: Dynamic Switching Characteristics
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V, (n-1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3.3V to threshold (V ILD ), 0V to threshold (V IHD ), f=1MHz.
Symbol
Parameter
Test Condition
Value Unit
V CC (V)T A = 25°C -40 to 85°C -55 to 125°C Min.Typ.
Max.
Min.Max.
Min.Max.
V IH
High Level Input Voltage
2.0 1.5 1.5 1.5V
3.0 2.0 2.0 2.03.6 2.4
2.4
2.4
V IL
Low Level Input Voltage
2.00.50.50.5V
3.00.80.80.83.60.8
0.8
0.8V OH
High Level Output Voltage
2.0I O =-50 µA 1.9 2.0 1.9 1.9V
3.0I O =-50 µA 2.9 3.0
2.9 2.9
3.0
I O =-4 mA 2.58
2.48
2.4
V OL
Low Level Output Voltage
2.0I O =50 µA 0.00.10.10.1V
3.0I O =50 µA 0.0
0.10.10.13.0
I O =4 mA 0.360.440.55I I Input Leakage Current
3.6V I = 5V or GND ± 0.1± 1± 1µA I CC
Quiescent Supply Current
3.6
V I = V CC or GND
2
20
20
µA Symbol
Parameter
Test Condition
Value Unit
V CC (V)T A = 25°C -40 to 85°C -55 to 125°C Min.
Typ.Max.Min.
Max.
Min.
Max.
V OLP Dynamic Low Voltage Quiet Output (note 1, 2) 3.3C L = 50 pF
0.3
0.5
V
V OLV -0.5
-0.3
V IHD
Dynamic High
Voltage Input (note 1, 3)
3.3
2
V ILD
Dynamic Low
Voltage Input (note 1, 3)
3.3
0.8
74LVX157
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Table 8: AC Electrical Characteristics (Input t r = t f = 3ns)
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-ing in the same direction, either HIGH or LOW 2) Parameter guaranteed by design (*) Voltage range is 3.3V ± 0.3V
Table 9: Capacitive Characteristics
1) C PD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I CC(opr) = C PD x V CC x f IN + I CC /n (per circuit)
Symbol
Parameter
Test Condition
Value Unit
V CC (V)C L (pF)T A = 25°C -40 to 85°C -55 to 125°C Min.
Typ.Max.Min.Max.Min.Max.t PLH t PHL Propagation Delay
Time (A, B - Y)
2.715 6.612.5 1.015.5 1.016.5ns
2.7509.116.0 1.019.0 1.020.0
3.3(*)15 5.17.9 1.09.5 1.011.03.3(*)507.611.4 1.013.0 1.01
4.0t PLH t PHL Propagation Delay
Time
(SELECT - Y)
2.7158.916.9 1.020.5 1.021.5ns
2.75011.420.4 1.024.0 1.026.0
3.3(*)157.011.0 1.013.0 1.01
4.03.3(*)509.514.5 1.016.5 1.017.5t PLH t PHL Propagation Delay
Time
(STROBE - Y)
2.7159.117.6 1.020.5 1.021.5ns
2.75011.621.1 1.020.4 1.021.4
3.3(*)157.211.5 1.013.5 1.01
4.53.3(*)509.71
5.0 1.0
17.0 1.0
18.0t OSLH t OSHL
Output To Output Skew Time (note1, 2)
2.7500.5 1.0 1.5 1.5ns
3.3(*)
50
0.5
1.0
1.5
1.5
Symbol
Parameter
Test Condition
Value Unit
V CC (V)T A = 25°C -40 to 85°C -55 to 125°C Min.
Typ.Max.Min.
Max.Min.
Max.
C IN Input Capacitance 3.3410
10
pF C PD
Power Dissipation Capacitance (note 1)
3.3
f IN = 10MHz
20
pF
74LVX157 Figure 3: Test Circuit
C L =15/50pF or equivalent (includes jig and probe capacitance)
R T = Z OUT of pulse generator (typically 50Ω)
Figure 4: Waveform - Propagation Delays For Inverting Conditions (f=1MHz; 50% duty cycle)
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74LVX157
Figure 5: Waveform- Propagation Delays For Non-inverting Conditions (f=1MHz; 50% duty cycle)
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74LVX157
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DIM.mm.
inch MIN.
TYP
MAX.MIN.
TYP.
MAX.A 1.750.068a10.1
0.250.0040.010a2 1.640.063b 0.350.460.0130.018b10.19
0.25
0.007
0.010
C 0.5
0.019
c145° (typ.)
D 9.8100.3850.393
E 5.8
6.2
0.228
0.244
e 1.270.050e38.89
0.350
F 3.8 4.00.1490.157
G 4.6 5.30.1810.208L 0.5 1.270.019
0.050M 0.62
0.024S
8° (max.)
SO-16 MECHANICAL DATA
0016020D
74LVX157
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DIM.
mm.
inch
MIN.
TYP
MAX.MIN.
TYP.
MAX.A 1.20.047A10.050.150.0020.0040.006A20.81 1.050.0310.039
0.041b 0.190.300.0070.012c 0.090.200.0040.0079D 4.95 5.10.1930.1970.201E 6.2 6.4 6.60.2440.2520.260E1 4.3
4.4 4.48
0.169
0.1730.176
e 0.65 BSC
0.0256 BSC
K 0˚8˚0˚8˚L
0.45
0.60
0.75
0.018
0.024
0.030
TSSOP16 MECHANICAL DATA
c
E
b
A2
A E1
D
1
PIN 1 IDENTIFICATION
A1
L
K
e
0080338D
74LVX157 Tape & Reel SO-16 MECHANICAL DATA
mm.inch
DIM.
MIN.TYP MAX.MIN.TYP.MAX.
A33012.992
C12.813.20.5040.519
D20.20.795
N60 2.362
T22.40.882
Ao 6.45 6.650.2540.262
Bo10.310.50.4060.414
Ko 2.1 2.30.0820.090
Po 3.9 4.10.1530.161
P7.98.10.3110.319
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74LVX157
Tape & Reel TSSOP16 MECHANICAL DATA
mm.inch DIM.
MIN.TYP MAX.MIN.TYP.MAX.
A33012.992 C12.813.20.5040.519 D20.20.795
N60 2.362
T22.40.882 Ao 6.7 6.90.2640.272 Bo 5.3 5.50.2090.217 Ko 1.6 1.80.0630.071 Po 3.9 4.10.1530.161 P7.98.10.3110.319
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74LVX157 Table 10: Revision History
Date Revision Description of Changes 27-Aug-20043Ordering Codes Revision - pag. 1.
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74LVX157
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