Datasheet 74LVX157SJX, 74LVX157SJ, 74LVX157MX, 74LVX157MTCX, 74LVX157MTC Datasheet (Fairchild Semiconductor)

May 1993
Revised March 1999

74LVX157 Low Voltage Quad 2-Input Multiplexer

© 1999 Fairchild Semiconductor Corporation DS011608.prf www.fairchildsemi.com

74LVX157
Low Voltage Quad 2-Input Multiplexer

General Description

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 gener ator.

Features

■ 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:

Devices are also avai lable in Tape and Reel. Specify by append ing letter suffix “X” to the ordering code.

Logic Symbols

IEEE/IEC

Connection Diagram

Pin Descriptions

Order Number Package Number Package Description

74LVX157M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
74LVX157SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LVX157MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names Description

I

0a–I0d

Source 0 Data Inputs

I

1a–I1d

Source 1 Data Inputs

E

Enable Input
S Select Input
Z

a–Zd

Outputs

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74LVX157

Truth Table

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 un der the control of a com­mon 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 sup­plied to the Select input. The logic equations for the outputs
are shown below:

Z

a

= E • (I1a • S + I0a • S)

Z

b

= E • (I

1b

• S + I0b • S)

Z

c

= E • (I

1c

• S + I0c • S)

Z

d

= E • (I

1d

• 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 t he S elect in put . A less ob vious us e 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.

Logic Diagram

Inputs Outputs

E

SI0I

1

Z

HXXX L
LHXL L
LHXH H
LLLX L
LLHX H

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74LVX157

Absolute Maximum Ratings(Note 1) Recommended Operating

Conditions

(Note 2)

Note 1: The “Absolute Maximum Ratings ” are those val ues beyond w hich
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 “Recommend ed O peratin g Cond itions” t able w ill defin e the condition s
for actual device operation.

Note 2: Unused inputs must be held HIGH or LOW. They may not float.

DC Electrical Characteristics

Noise Characteristics

(Note 3)

Note 3: Input tr = tf = 3ns

Supply Voltage (VCC) −0.5V to +7.0V
DC Input Diode Current (I

IK

)

V

I

= −0.5V −20 mA

DC Input Voltage (V

I

) −0.5V to 7V

DC Output Diode Current (I

OK

)

V

O

= −0.5V −20 mA

V

O

= VCC + 0.5V +20 mA

DC Output Voltage (V

O

) −0.5V to VCC + 0.5V

DC Output Source

or Sink Current (I

O

) ±25 mA

DC V

CC

or Ground Current

(I

CC

or I

GND

) ±50 mA

Storage Temperature (T

STG

) −65°C to +150°C

Power Dissipation 180 mW

Supply Voltage (V

CC

) 2.0V to 3.6V

Input Voltage (V

I

) 0V to 5.5V

Output Voltage (V

O

)0V to V

CC

Operating Temperature (TA) −40°C to +85°C
Input Rise and Fall Time (∆t/∆V) 0 ns/V to 100 ns/V

Symbol Parameter

V

CC

TA = +25°C TA = −40°C to +85°C

Units Conditions

Min Typ Max Min Max

V

IH

HIGH Level 2.0 1.5 1.5
Input Voltage 3.0 2.0 2.0 V

3.6 2.4 2.4

V

IL

LOW Level 2.0 0.5 0.5
Input Voltage 3.0 0.8 0.8 V

3.6 0.8 0.8

V

OH

HIGH Level 2.0 1.9 2.0 1.9 VIN = VIL or VIHIOH = −50 µA
Output Voltage 3.0 2.9 3.0 2.9 V IOH = −50 µA

3.0 2.58 2.48 IOH = −4 mA

V

OL

LOW Level 2.0 0.0 0.1 0.1 VIN = V

IL

or VIHIOL = 50 µA

Output Voltage 3.0 0.0 0.1 0.1 V IOL = 50 µA

3.0 0.36 0.44 IOL = 4 mA

I

IN

Input Leakage Current 3.6 ±0.1 ±1.0 µAVIN = 5.5V or GND

I

CC

Quiescent Supply Current 3.6 4.0 40.0 µAVIN = VCC or GND

Symbol Parameter

V

CC

(V)

TA = 25°C

Units

CL (pF)

Typ Limit

V

OLP

Quiet Output Maximum Dynamic V

OL

3.3 0.3 0.5 V 50

V

OLV

Quiet Output Minimum Dynamic V

OL

3.3 −0.3 −0.5 V 50

V

IHD

Minimum HIGH Level Dynamic Input Voltage 3.3 2.0 V 50

V

ILD

Maximum LOW Level Dynamic Input Voltage 3.3 0.8 V 50

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74LVX157

AC Electrical Characteristics

Note 4: Paramete r guaranteed by desig n.

t

OSLH

= |t

PLHm

− t

PLHn

|.

t

OSHL

= |t

PHLm

− t

PHLn

|.

Capacitance

Note 5: CPD is defined as the value of the internal equivalent capacitance whic h is calculated from the operating current cons umption without load.

Average operating cu rrent can be obtained b y the equation: I

CC(opr.)

= CPD × V

CC

× fIN + I

CC

Symbol Parameter

V

CC

(V)

TA = +25°C TA = −40°C to +85°C

Units

CL (pF)

Min Typ Max Min Max

t

PLH

Propagation 2.7 6.6 12.5 1.0 15.5

ns

15

t

PHL

Delay Time 9.1 16.0 1.0 19.0 50
I n to Z

n

3.3 ± 0.3 5.1 7.9 1.0 9.5 15

7.6 11.4 1.0 13.0 50

t

PLH

Propagation 2.7 8.9 16.9 1.0 20.5

ns

15

t

PHL

Delay Time 11.4 20.4 1.0 24.0 50
S to Z

n

3.3 ± 0.3 7.0 11.0 1.0 13.0 15

9.5 14.5 1.0 16.5 50

t

PLH

t

PHL

Propagation 2.7 9.1 17.6 1.0 20.5

ns

15
Delay Time 11.6 21.1 1.0 24.0 50
E to Z

n

3.3 ± 0.3 7.2 11.5 1.0 13.5 15

9.7 15.0 1.0 17.0 50

t

OSHL

Output to Output 2.7 1.5 1.5

ns

50

t

OSLH

Skew (Note 4) 3.3 1.5 1.5

Symbol Parameter

TA = +25°C TA = −40°C to +85°C

Units

Min Typ Max Min Max

C

IN

Input Capacitance 4 10 10 pF

C

PD

Power Dissipation Capacitance (Note 5) 20 pF

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74LVX157

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

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.

74LVX157 Low Voltage Quad 2-Input Multiplexer

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 syste ms
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 rea­sonably expected to result in a significant inju ry to the
user.

2. A critical component i n any compon ent of a lif e support
device or system whose failu re to perform can be rea­sonably expected to ca use the fa i lure of the life su pp ort
device or system, or to affect its safety or effectiveness.

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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