SGS Thomson Microelectronics 74VHCT157A Datasheet



QUAD 2 CHANNEL MULTIPLEXER

■ HIGHSPEED:t

■ LOW POWER DISSIPATION:

=4 µA(MAX.)atTA=25oC

I

CC

■ COMPATIBLEWITHTTL OUTPUTS:

=2V(MIN),VIL=0.8V(MAX)

V

IH

■ POWERDOWNPROTECTIONON INPUTS&

OUTPUTS

■ SYMMETRICALOUTPUTIMPEDANCE:

|I

|=IOL=8 mA(MIN)

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

PHL

■ OPERATINGVOLTAGERANGE:

(OPR)= 4.5Vto 5.5V

V

CC

■ PINANDFUNCTIONCOMPATIBLEWITH

74SERIES157

■ IMPROVEDLATCH-UP IMMUNITY

■ LOWNOISE:V

DESCRIPTION

The 74VHCT157A is an high-speed CMOS
QUAD 2-CHANNEL MULTIPLEXER fabricated
with sub-micron silicon gate and double-layer
metalwiring C

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

=6.2ns (TYP.)atVCC=5V

PD

= 0.8V(Max.)

OLP

2

MOStechnology.

74VHCT157A

PRELIMINARY DATA

SOP TSSOP

ORDER CODES

PACKAGE TUBE T & R

SOP 74VHCT157AM 74VHCT157AMTR

TSSOP 74VH C T157 ATTR

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 outputs 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 equipped with protection
circuits against static discharge, giving them 2KV
ESD immunity and transientexcess voltage.

PIN CONNECTION AND IEC LOGICSYMBOLS

March 2000

1/9

74VHCT157A

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

74VHCT157A

ABSOLUTE MAXIMUM RATINGS

Symb o l Para met er Value U n i t

V

V
V
V

I

I

OK

I

orI

I

CC

T

T

AbsoluteMaximumRatingsarethosevaluesbeyond whichdamagetothedevicemayoccur. Functional operationundertheseconditionisnotimplied.

1)V

=0

CC

2)HighorLowState

RECOMMENDED OPERATINGCONDITIONS

Symb o l Para met er Value Unit

V

V
V
V

T

dt/dv

1)VCC=0

2)HighorLowState
from0.8Vto 2V

3)V

IN

Supply Voltage -0.5to+7.0 V

CC

DC Input Voltage -0.5to+7.0 V

I

DC Output Voltage (see note 1) -0.5to+7.0 V

O

DC Output Voltage (see note 2) -0.5toVCC+0.5 V

O

DC Input Diode Current -20 mA

IK

DC Output Diode Current
DC Output Current

O

DC VCCor Ground Current ±50 mA

GND

Storage Temperature -65to+150

stg

Lead Temperature (10 sec) 300

L

Supply Voltage 4.5to5.5 V

CC

Input Voltage 0to5.5 V

I

Output Voltage (see note 1) 0to5.5 V

O

Output Voltage (see note 2) 0toV

O

Operating Temperature -40to+85

op

Input Rise and Fall Time (see note 3) (V

=5.0±0.5V)

CC

20 mA

±

25 mA

±

CC

0to20 ns/V

o

C

o

C

V

o

C

DC SPECIFICATIONS

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

T

V

CC

High Level Input

V

IH

(V)

4.5to5.5 2 2 V

Min. Typ. Max. Min. Max.

Voltage
Low Level Input

V

IL

4.5to5.5 0.8 0.8 V

Voltage
High Level Output

V

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

4.5 IO=-50µA4.44.5 4.4

4.5 I

=-8mA 3.94 3.8

O

4.5 IO=50µA 0.0 0.1 0.1

4.5 I

=8mA 0.36 0.44

O

5.5 VI=VCCorGND 4 40

Current
Additional Worst Case

∆I

CC

Supply Current

5.5 One Input at3.4V,
other input at V

CC

or

GND

I

OPD

Output Leakage

0V

=5.5V 0.5 5.0 µA

OUT

Current

=25oC -40 to 85oC

A

1.35 1.5 mA

µ

V

V

A

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