Datasheet 74LCX16244A Datasheet (ST)

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74LCX16244A

LOW VOLTAGE CMOS 16-BIT BUS BUFFER (3-STATE)

WITH 5V TOLERANT INPUTS AND OUTPUTS

■ 5VTOLERANTINPUTSANDOUTPUTS

■

HIGHSPEED:
t

=5.2ns (MAX.)atVCC=3.0V

PD

■

POWER-DOWNPROTECTIONONINPUTS
ANDOUTPUTS

■ SYMMETRICAL OUTPUTIMPEDANCE:

|=IOL=24mA (MIN)

|I

OH

■ PCIBUSLEVELSGUARANTEED AT 24mA

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

PHL

■ OPERATINGVOLTAGERANGE:

(OPR)= 2.7Vto 3.6V (1.5VDataRetention)

V

CC

■ PINANDFUNCTIONCOMPATIBLEWITH

74SERIES16244

■ LATCH-UPPERFORMANCEEXCEEDS500mA

■ ESDPERFORMANCE:

HBM>2000V; MM > 200V

(TSSOP48Package)

ORDERCODES:

74LCX16244AT

PIN CONNECTION

T

DESCRIPTION

The LCX16244A is a low voltage CMOS 16-BIT
BUS BUFFER (NON-INVERTED) fabricated with
sub-micron silicon gate and double-layer metal
wiring C

2

MOS technology. It is ideal for low
power and high speed 3.3V applications; it can
be interfaced to 5V signal environment for both
inputsand outputs.

Any nG output control governs four BUS
BUFFERS. Output Enable input (nG) tied
togethergives full 16-bit operation.

When nG is LOW, the outputs are on. When nG
is HIGH, the output are in highimpedancestate.

This device is designed to be used with 3 state
memoryaddress drivers, etc.

It has better speed performance at 3.3V than 5V
LSTTL family combined with the true CMOS low
powerconsumption.

All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.

February 1999

1/8

74LCX16244A

INPUT AND OUTPUT EQUIVALENTCIRCUIT

PI N No SYM BO L NAM E AND FU NCTIO N

1 1G Output Enable Input

2,3,5,6 1Y1to 1Y4 Data Outputs

8,9,11,12 2Y1to 2Y4 Data Outputs
13,14,16,17 3Y1to 3Y4 Data Outputs
19,20,22,23 4Y1to 4Y4 Data Outputs

24 4G Output Enable Input

25 3G Output Enable Input
30,29,27,26 4A1to 4A4 Data Inputs
36,35,33,32 3A1to 3A4 Data Inputs
41,40,38,37 2A1to 2A4 Data Inputs
47,46,44,43 1A1to 1A4 Data Inputs

48 2G Output Enable Input

4,10,15,21,

28,34,39,45

7,18,31,42 V

GND Ground (0V)

Positive Supply Voltage

CC

IEC LOGIC SYMBOLSPIN DESCRIPTION

TRUTH TABLE

INPUT OUTPU T

GAnYn

LLL
LHH

HXZ

X:”H” or”L”
Z:Highimpedance

2/8

74LCX16244A

ABSOLUTE MAXIMUM RATINGS

Symb o l Para met er Val u e Uni t

V

V
V
V

I
I

OK

I
orI

I

CC

T

T

AbsoluteMaximumRatingsarethosevaluesbeyond whichdamageto thedevicemayoccur.Functionaloperationunder thesecondition isnotimplied.

1)I

absolutemaximum ratingmustbeobserved

O

2)V

<GND, VO>V

O

RECOMMENDED OPERATINGCONDITIONS

Symb o l Pa rameter Val u e U n i t

V

V
V

I

OH,IOL

I

OH,IOL

T

dt/dv Input Transition Rise or Fall Rate (V

1)TruthTableguaranteed: 1.5Vto3.6V

2)V

from0.8Vto 2.0V

IN

Supply Voltage -0.5to+ 7.0 V

CC

DC Input Voltage -0.5to+ 7.0 V

I

DC Output Voltage (OFF state) -0.5to+ 7.0 V

O

DC Output Voltage (High or Low State) (note1) -0.5toVCC+0.5 V

O

DC Input Diode Current -50 mA

IK

DC Output Diode Current (note2)
DC Output Source/Sink Current

O

DC VCCor Ground Current Per Supply Pin ±100 mA

GND

Storage Temperature -65to+150

stg

Lead Temperature (10 sec) 300

L

CC

Supply Voltage (note 1) 2.0to3.6 V

CC

V

Input Voltage 0to5.5 V

I

Output Voltage (OFF state) 0to5.5 V

O

Output Voltage (High or Low State) 0toV

O

50 mA

±

50 mA

±

CC

High or Low Level Output Current (VCC= 3.0 to 3.6V) ±24 mA
High or Low Level Output Current (VCC= 2.7 to 3.0V)
Operating Temperature: -40to+85

op

= 3.0V) (note 2) 0 to10 ns/V

CC

12 mA

±

o

C

o

C

V

o

C

3/8

74LCX16244A

DC SPECIFICATIONS

Symb o l Parameter Test Cond itio n s Val ue Uni t

V

CC

(V)

High Level Input Voltage

V

IH

Low Level Input Voltage 0.8 V

V

IL

High Level Output Voltage 2.7to3.6

V

OH

Low Level Output Voltage 2.7to3.6

V

OL

Input Leakage Current

I

I

3 State Output Leakage Current 2.7to3.6 VI=VIHorV

I

OZ

2.7to 3.6

V

2.7 I

I=VIH

orV

3.0

V

2.7 I

3.0 I

I=VIH

orV

3.0 I

2.7to 3.6

IO=-100 µAVCC-0.2

=-12mA 2.2

O

IL

=-18mA 2.4

I

O

=-24mA 2.2

I

O

IO=100µA0.2

=12mA 0.4

O

IL

=16mA 0.4

O

=24mA 0.55

O

VI=0to5.5V ±5 µA

IL

-40 to85

Min. Max.

2.0

o

C

V

V

V

±5 µA

VO=0to5.5V

Power Off Leakage Current 0 VIorVO=5.5V(perpin) 10 µA

I

off

Quiescent Supply Current 2.7to3.6 VI=VCCorGND 20

I

CC

V

I

orVO=

20

±

µA

3.6to5.5V

ICC incr. per input 2.7to3.6 VIH=VCC-0.6V 500 µA

∆I

CC

DYNAMICSWITCHINGCHARACTERISTICS

Symbol Parameter Test Condit ion s Value Unit

T

V

CC

(V)

V
V

1)Number ofoutputs defined as”n”.Measured with”n-1”outputsswitchingfromHIGHto LOWor LOWtoHIGH.Theremainingoutputismeasured in
theLOWstate.

Dynamic Low Voltage Quiet Output

OLP

(note 1)

OLV

3.3 CL=50pF
V

=0V

IL

V

=3.3V

IH

Min. Typ. Max.

=25oC

A

0.8

-0.8

V

4/8

AC ELECTRICAL CHARACTERISTICS (CL= 50 pF, RL= 500 Ω, Input tr=tf= 2.5 ns)

74LCX16244A

Symbol Parameter Test Con dition Value Unit

V

CC

(V)

t

Propagation Delay Time 2.7

PLH

t

PHL

t

Output Enable Time 2.7

PZL

t

PZH

t

Output Disable Time 2.7

PLZ

t

PHZ

t
t

1) Skewisdefinedastheabsolutevalueofthedifferencebetweentheactualpropagationdelayfor anytwooutputsofthesamedeviceswitchingin the
samedirection,eitherHIGHor LOW(t

2) Parameterguaranteed bydesign

Output to Output Skew Time (note 1, 2) 3.0to3.6 1.0 ns

OSLH
OSHL

OSLH

=|t

PLHm-tPLHn

|,t

=|t

OSHL

3.0to3.6 1.5 5.2

3.0to3.6 1.5 6.5

3.0to3.6 1.5 5.5

PHLm-tpHLn

|)

Waveform -40 to 85

Mi n . Max.

1

2

2

1.5 6.2

1.5 7.5

1.5 6.5

o

C

ns

ns

ns

CAPACITIVE CHARACTERISTICS

Symbol Parameter Test Co nditions Value Unit

T

V

CC

(V)

Input Capacitance

C

IN

C

1)CPDisdefinedas thevalueoftheIC’sinternalequivalentcapacitance whichiscalculated fromtheoperatingcurrentconsumption without load.Average
opertingcurrentcanbeobtainedby thefollowingequation.I

Output Capacitance

OUT

Power Dissipation Capacitance (note 1) 3.3 fIN=10MHz

C

PD

(opr)= CPD• VCC• fIN+ICC/16(percircuit)

CC

3.3

3.3

VIN=0toV
VIN=0toV

V

=0orV

IN

CC
CC

CC

=25oC

A

Mi n. T yp . Max.

7
8

20 pF

pF
pF

TESTCIRCUIT

TEST SW ITCH

t

PLH,tPHL

t

PZL,tPLZ

t

PZH,tPHZ

CL= 50 pF orequivalent (includes jigand probe capacitance)

=500Ωorequivalent

R

L=R1

R

ofpulsegenerator(typically50Ω)

T=ZOUT

Open

6V

GND

5/8

74LCX16244A

WAVEFORM 1: PROPAGATIONDELAYS

(f=1MHz;50% duty cicle)

WAVEFORM 2: OUTPUTENABLE AND DISABLE TIME (f=1MHz; 50% duty cicle)

6/8

TSSOP48 MECHANICAL DATA

74LCX16244A

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.1 0.433

A1 0.05 0.10 0.15 0.002 0.004 0.006

A2 0.85 0.9 0.95 0.335 0.354 0.374

b 0.17 0.27 0.0067 0.011

c 0.09 0.20 0.0035 0.0079

D 12.4 12.5 12.6 0.408 0.492 0.496

E 7.95 8.1 8.25 0.313 0.319 0.325

E1 6.0 6.1 6.2 0.236 0.240 0.244

e 0.5 BSC 0.0197 BSC

K0

o

o

4

o

8

o

0

o

4

8

L 0.50 0.60 0.70 0.020 0.024 0.028

o

A2

A

A1

PIN 1 IDENTIFICATION

b

e

K

c

L

E

D

E1

1

7/8

74LCX16244A

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of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implicationor otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in thispublication are
subject tochange without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components inlife support devices or systems without express written approval of STMicroelectronics.

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1999 STMicroelectronics – Printed in Italy – All Rights Reserved

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