SGS Thomson Microelectronics 74VHC157 Datasheet



QUAD 2 CHANNEL MULTIPLEXER

■ HIGHSPEED:t

■ LOW POWER DISSIPATION:

=4 µA(MAX.)atTA=25oC

I

CC

■ HIGHNOISEIMMUNITY:

V

NIH=VNIL

■ POWERDOWNPROTECTIONON INPUTS

■ SYMMETRICALOUTPUTIMPEDANCE:

|=IOL=8 mA(MIN)

|I

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

■ OPERATINGVOLTAGERANGE:

V

(OPR)= 2V to5.5V

CC

■ PINANDFUNCTIONCOMPATIBLEWITH

=28%VCC(MIN.)

PHL

74SERIES157

■ IMPROVEDLATCH-UP IMMUNITY

■ LOWNOISE:V

DESCRIPTION

The 74VHC157 is an high-speed CMOS QUAD
2-CHANNEL MULTIPLEXER fabricated with
sub-micron silicon gate and double-layer metal
wiringC

2

MOStechnology.

It consists of four 2-input digital multiplexers with
common select and strobe inputs. It is a

=4.1ns (TYP.)atVCC=5V

PD

= 0.8V(Max.)

OLP

74VHC157

PRELIMINARY DATA

M1

(Micro Package)

(TSSOPPackage)

ORDERCODES :

74VHC157M 74VHC157T

non-inverting multiplexer. When the 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 Youtputs.

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.All inputs and outputs
are equippedwith protectioncircuitsagainst static
discharge, giving them 2KV ESD immunity and
transientexcessvoltage.

T

PIN CONNECTION AND IEC LOGICSYMBOLS

June 1999

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74VHC157

INPUT EQUIVALENTCIRCUIT

PIN DESCRIPTION

PI N No SYM BO L NAM E AND FUNCT I O N

1 SELECT Common Data Select Input

2,5,11,14 1Ato4A Data Inputs From

Source A

3,6,10,13 1Bto4B Data Inputs From

Source B

4,7,9,12 1Yto4Y Multiplexer Outputs

15 STROBE Strobe Input

8 GND Ground (0V)

16 V

Positive Supply Voltage

CC

TRUTH TABLE

INPUT OUTPUT

STROBE SELECT A B Y

HXXXL

LLLXL
LLHXH
LHXLL
LHXHH

X:”H” or”L”

LOGICDIAGRAM

2/9

74VHC157

ABSOLUTE MAXIMUM RATINGS

Symb o l Para met er Val u e Uni t

V

V

V

I

I

OK

I

orI

I

CC

T

T

AbsoluteMaximumRatingsarethosevaluesbeyond whichdamagetothedevicemayoccur. Functional operationundertheseconditionisnotimplied.

RECOMMENDED OPERATINGCONDITIONS

Symb o l Para met er Value Un it

V

V

V

T

dt/dv

1)VINfrom30%to70%ofV

Supply Voltage -0.5to+7.0 V

CC

DC Input Voltage -0.5to+7.0 V

I

DC Output Voltage -0.5toVCC+0.5 V

O

DC Input Diode Current -20 mA

IK

DC Output Diode Current ±20 mA
DC Output Current

O

DC VCCor Ground Current

GND

Storage Temperature -65to+150

stg

Lead Temperature (10 sec) 300

L

Supply Voltage 2.0to5.5 V

CC

Input Voltage 0to5.5 V

I

Output Voltage 0toV

O

Operating Temperature -40to+85

op

(V

CC
CC

=3.3±0.3V)
=5.0±0.5V)

Input Rise and Fall Time (see note 1) (V

CC

25 mA

±

50 mA

±

CC

0to100

0to20

o

C

o

C

V

o

C

ns/V
ns/V

DC SPECIFICATIONS

Symb o l Para met er Test C o n dit io ns Val u e Unit

=25oC -40 to 85oC

V

CC

(V)

High Level Input

V

IH

Voltage

V

Low Level Input

IL

Voltage

V

High Level Output

OH

Voltage

Low Level Output

V

OL

Voltage

Input Leakage Current 0to5.5 VI=5.5VorGND ±0.1 ±1.0 µA

I

I

Quiescent Supply

I

CC

2.0 1.5 1.5

3.0to 5.5 0.7V

2.0 0.5 0.5

3.0to 5.5 0.3V

2.0 IO=-50µA1.92.0 1.9

3.0 I

4.5 I

3.0 I

4.5 I

=-50µA2.93.0 2.9

O

=-50µA4.44.5 4.4

O

=-4mA 2.58 2.48

O

=-8mA 3.94 3.8

O

2.0 IO=50µA 0.0 0.1 0.1

3.0 I

4.5 I

3.0 I

4.5 I

=50µA 0.0 0.1 0.1

O

=50µA 0.0 0.1 0.1

O

=4mA 0.36 0.44

O

=8mA 0.36 0.44

O

5.5 VI=VCCorGND 4 40 µA

Current

T

A

Min. Typ. Max. Min. Max.

CC

0.7V

CC

0.3V

CC

CC

V

V

V

V

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