ST 74LVX157 User Manual
74LVX157
LOW VOLTAGE QUAD 2 CHANNEL MULTIPLEXER
WITH 5V TOLERANT INPUTS
■ HIGH SPEED:
t
= 5.1 ns (TYP.) at V
PD
■ 5V TOLERANT INPUTS
■ INPUT VOLTAG E LEVEL:
V
=0.8V , VIH=2V at VCC=3V
IL
■ LOW POWER DISSIPATION:
I
= 2 µA (MAX.) at TA=25°C
CC
■ LOW NOISE:
V
= 0.3V (TYP.) at VCC = 3.3V
OLP
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
| = IOL = 4mA (MIN)
OH
■ BALANCED PROPAGATION DELAYS:
t
≅ t
PLH
PHL
■ OPERATING VOLTAGE RANGE:
V
(OPR) = 2V to 3.6V (1.2V Data Retention)
CC
■ PIN AND FUNCTION COMPATIBLE WITH
CC
= 3.3V
74 SERIES 157
■ IMPROVED LATCH-UP IMMUNITY
■ POWER DOWN PROTECTION ON INPUTS
DESCRIPTION
The 74LVX157 i s a low voltage CMOS QUAD 2
CHANNEL MULTIPLEXER fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS 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
TSSOPSOP
Table 1: Order Codes
PACKAGE T & R
SOP 74LVX157MTR
TSSOP 74LVX157TTR
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 disc harge, giving
them 2KV ESD immunity and transient excess
voltage.
Figure 1: Pin Connection And IEC Logic Symbols
Rev. 3
1/12August 2004
74LVX157
Figure 2: Input Equivalent Circuit Table 2: Pin Description
PIN N° SYMBOL NAME AND FUNCTION
1 SELECT Common Data Select
Inputs
2, 5, 11, 14 1A to 4A Data Inputs From Source
A
3, 6, 10, 13 1B to 4B Data Inputs From Source
B
4, 7, 9, 12 1Y to 4Y Multiplexer Outputs
15 STROBE Strobe Input
8 GND Ground (0V)
Positive Supply Voltage
Table 3: Truth Table
16 V
CC
INPUTS OUTPUT
STROBE
SELECT A B Y
HXXXL
LLLXL
LLHXH
LHXLL
LHXHH
X : Don’t Care
Table 4: Absolute Maximum Ratings
Symbol Parameter Value Unit
V
V
V
I
I
OK
I
or I
I
CC
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
Supply Voltage
CC
DC Input Voltage
I
DC Output Voltage -0.5 to VCC + 0.5
O
DC Input Diode Current
IK
DC Output Diode Current
DC Output Current
O
DC VCC or Ground Current
GND
Storage Temperature
stg
Lead Temperature (10 sec)
L
-0.5 to +7.0 V
-0.5 to +7.0 V
V
- 20 mA
± 20 mA
± 25 mA
± 50 mA
-65 to +150 °C
300 °C
Table 5: Recommended Operating Conditions
Symbol Parameter Value Unit
V
V
V
T
dt/dv
1) Truth T abl e guarante ed: 1.2V to 3.6V
2) VIN from 0.8V to 2.0V
Supply Voltage (note 1)
CC
Input Voltage
I
Output Voltage 0 to V
O
Operating Temperature
op
Input Rise and Fall Time (note 2) (V
= 3.3V)
CC
2 to 3.6 V
0 to 5.5 V
CC
-55 to 125 °C
0 to 100 ns/V
2/12
V
Table 6: DC Specifications
Symbol Parameter
V
V
V
High Level Input
IH
Voltage
V
Low Level Input
IL
Voltage
High Level Output
OH
Voltage
Low Level Output
OL
Voltage
Input Leakage
I
I
Current
I
Quiescent Supply
CC
Current
74LVX157
Test Condition Value
= 25°C
T
V
CC
(V)
A
Min. Typ. Max. Min. Max. Min. Max.
2.0 1.5 1.5 1.5
3.6 2.4 2.4 2.4
2.0 0.5 0.5 0.5
3.6 0.8 0.8 0.8
=-50 µA
2.0
3.0
2.0
3.0
3.6
3.6
I
O
=-50 µA
I
O
=-4 mA
I
O
IO=50 µA
I
=50 µA
O
=4 mA
I
O
= 5V or GND
V
I
V
= VCC or GND
I
1.9 2.0 1.9 1.9
2.9 3.0 2.9 2.9
2.58 2.48 2.4
0.0 0.1 0.1 0.1
0.0 0.1 0.1 0.1
-40 to 85°C -55 to 125°C
0.36 0.44 0.55
± 0.1 ± 1 ± 1 µA
22020µA
Unit
V3.0 2.0 2.0 2.0
V3.0 0.8 0.8 0.8
V3.0
V3.0
Table 7: Dynamic Switching Characteristics
Test Condition Value
= 25°C
Symbol Parameter
V
V
V
Dynamic Low
OLP
Voltage Quiet
OLV
Output (note 1, 2)
Dynamic High
IHD
Voltage Input (note
V
CC
(V)
3.3
3.3 2
= 50 pF
C
L
T
A
Min. Typ. Max. Min. Max. Min. Max.
0.3 0.5
-0.5 -0.3
1, 3)
V
Dynamic Low
ILD
Voltage Input (note
3.3 0.8
1, 3)
1) Worst case package.
2) Max number of outp ut s defined as (n). Data inp ut s are driven 0V to 3.3V, (n-1) outputs switc hi ng and one out put 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
(V
), f=1MHz.
IHD
-40 to 85°C -55 to 125°C
ILD
Unit
V
), 0V to thresho l d
3/12
74LVX157
Table 8: AC Electrical Characteristics (Input tr = tf = 3ns)
Test Condition Value
Symbol Parameter
t
PLH tPHL
Propagation Delay
Time
(A, B - Y)
t
PLH tPHL
Propagation Delay
Time
(SELECT - Y)
t
PLH tPHL
t
OSLH
t
OSHL
Propagation Delay
Time
(STROBE
Output To Output
- Y)
Skew Time (note1,
2)
V
C
CC
(V)
L
(pF)
2.7 15 6.6 12.5 1.0 15.5 1.0 16.5
2.7 50 9.1 16.0 1.0 19.0 1.0 20.0
(*)
3.3
3.3
15 5.1 7.9 1.0 9.5 1.0 11.0
(*)
50 7.6 11.4 1.0 13.0 1.0 14.0
2.7 15 8.9 16.9 1.0 20.5 1.0 21.5
2.7 50 11.4 20.4 1.0 24.0 1.0 26.0
(*)
3.3
3.3
15 7.0 11.0 1.0 13.0 1.0 14.0
(*)
50 9.5 14.5 1.0 16.5 1.0 17.5
2.7 15 9.1 17.6 1.0 20.5 1.0 21.5
2.7 50 11.6 21.1 1.0 20.4 1.0 21.4
(*)
3.3
3.3
15 7.2 11.5 1.0 13.5 1.0 14.5
(*)
50 9.7 15.0 1.0 17.0 1.0 18.0
2.7 50 0.5 1.0 1.5 1.5
(*)
3.3
50
T
Min. Typ. Max. Min. Max. Min. Max.
= 25°C
A
-40 to 85°C -55 to 125°C
0.5 1.0 1.5 1.5
Unit
ns
ns
ns
ns
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switching in the sa m e di rection, ei ther HIGH or LOW
2) Param eter guaran teed by design
(*) Voltage range is 3.3V ±
0.3V
Table 9: Capacitive Characteristics
Test Condition Value
= 25°C
Symbol Parameter
C
C
Input Capacitance
IN
Power Dissipation
PD
Capacitance
V
CC
(V)
3.3 4 10 10 pF
= 10MHz
3.3
f
IN
T
A
Min. Typ. Max. Min. Max. Min. Max.
20 pF
(note 1)
1) CPD 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
-40 to 85°C -55 to 125°C
= CPD x VCC x f
CC(opr)
+ ICC/n (per c ircuit )
IN
Unit
4/12
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