SGS Thomson Microelectronics 74VHC244 Datasheet



74VHC244

OCTAL BUS BUFFER

WITH 3 STATE OUTPUTS (NON INVERTED)

■ HIGH SPEED:t

■ LOW POWERDISSIPATION:

=4 µA(MAX.)atTA=25oC

I

CC

■ HIGHNOISEIMMUNITY:

V

NIH=VNIL

■ POWERDOWNPROTECTIONON INPUTS

■ SYMMETRICALOUTPUTIMPEDANCE:

|=IOL=8mA (MIN)

|I

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

■ OPERATINGVOLTAGERANGE:

V

(OPR)= 2Vto5.5V

CC

■ PINANDFUNCTION COMPATIBLEWITH

=28%VCC(MIN.)

PHL

=3.9ns(TYP.)atVCC=5V

PD

74SERIES244

■ IMPROVEDLATCH-UP IMMUNITY

■ LOWNOISEV

=0.9V(Max.)

OLP

DESCRIPTION

The 74VHC244 is an advanced high speed
CMOS OCTAL BUS BUFFER (3-STATE)
fabricated with sub-micron silicon gate and
double-layermetal wiring C

2

MOS technology.

G output enable governsfour BUS BUFFERs.

M

(Micro Package)

(TSSOPPackage)

T

ORDERCODES :

74VHC244M 74VHC244T

This device is designed to be used with 3 state
memoryaddress drivers, etc.
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 equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

June 1999

1/8

74VHC244

INPUT EQUIVALENTCIRCUIT

TRUTH TABLE

GAnYn

LLL
LHH

HXZ

X:”H” or”L”
Z:Highimpedance

PIN DESCRIPTION

PI N No SYM BO L NAM E AND F UNCTI O N

1 1G Output Enable Input
2,4,6,8 1A1to1A4 Data Inputs
9,7,5,3 2Y1to2Y4 Data Outputs

11,13,15,17 2A1to2A4 Data Inputs
18,16,14,12 1Y1to1Y4 Data Outputs

19 2G Output Enable Input
10 GND Ground (0V)
20 V

INPUT OUTPU T

Positive Supply Voltage

CC

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

AbsoluteMaximumRatingsarethosevaluesbeyondwhichdamage tothedevicemayoccur.Functionaloperationunderthese conditionisnotimplied.

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 ±25 mA

O

DC VCCor Ground Current ±75 mA

GND

Storage Temperature -65to+150

stg

Lead Temperature (10 sec) 300

L

o

C

o

C

RECOMMENDED OPERATINGCONDITIONS

Symb o l Para met er Value Un it

V

V

V

T

dt/dv

1)VINfrom30%to70%of V

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

CC

0to100

0to20

V

o

C

ns/V
ns/V

2/8

74VHC244

DC SPECIFICATIONS

Symb o l Parameter Test Con diti ons Val u e Unit

T

V

CC

(V)

High Level Input

V

IH

Voltage

V

Low Level Input

IL

Voltage

V

High Level Output

OH

Voltage

2.0 1.5 1.5

3.0to5.5 0.7V

2.0 0.5 0.5

3.0to5.5 0.3V

2.0 IO=-50µA1.92.0 1.9

3.0 I

4.5 I

3.0 I

4.5 I

Low Level Output

V

OL

Voltage

2.0 IO=50µA 0.0 0.1 0.1

3.0 I

4.5 I

3.0 I

4.5 I

High Impedance

I

OZ

Output Leakage

5.5

Current
Input Leakage Current 0 to5.5 VI=5.5VorGND

I

I

Quiescent Supply

I

CC

5.5 VI=VCCorGND 4 40

Current

Min. Typ. Max. Min. Max.

=-50µA2.93.0 2.9

O

=-50µA4.44.5 4.4

O

=-4mA 2.58 2.48

O

=-8mA 3.94 3.8

O

=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

VI=VIHorV

IL

VO=VCCorGND

=25oC -40 to 85oC

A

±

±

0.7V

CC

0.25

0.1

CC

CC

0.3V

±

±

2.5

1.0

CC

µ

µ
µ

V

V

V

V

A

A
A

AC ELECTRICAL CHARACTERISTICS (Input tr=tf=3 ns)

Symbol Parameter Test Conditi on Value Unit

t

Propagation Delay

PLH

t

Time

PHL

Output Enable Time 3.3

t

PZL

t

PZH

t

Output Disable Time 3.3

PLZ

t

PHZ

t
t

(*) Voltagerangeis3.3V± 0.3V
(**) Voltagerange is 5V±0.5V
Note1:Parameterguaranteed bydesign. t

Output to Output Skew

OSLH

Time (note 1)

OSHL

soLH

V

(V)

3.3

3.3

5.0

5.0

3.3

5.0

5.0

5.0

3.3

5.0

=|t

pLHm-tpLHn

CC

C

L

(pF)

(*)

(*)
(**)
(**)

(*)

(*)
(**)
(**)

(*)
(**)

(*)
(**)

15 5.8 8.4 1.0 10.0
50 8.3 11.9 1.0 13.5
15 3.9 5.5 1.0 6.5
50 5.4 7.5 1.0 8.5
15 RL=1KΩ 6.6 10.6 1.0 12.5
50 RL=1K
15 RL=1KΩ 4.7 7.3 1.0 8.5
50 RL=1K
50 RL=1KΩ 10.3 14.0 1.0 16.0
50 RL=1K
50 1.5 1.5 ns
50

|,t

soHL

=|t

pHLm-tpHLn

|

Min. Typ. Max. Min. Max.

Ω

Ω

Ω

=25oC -40 to 85oC

T

A

9.1 14.1 1.0 16.0

6.2 9.3 1.0 10.5

6.7 9.2 1.0 10.5

1.0 1.0

ns

ns

ns

3/8

74VHC244

CAPACITIVE CHARACTERISTICS

Symb o l Parameter Test Con diti ons Val u e Unit

=25oC -40 to 85oC

T

A

Min. Typ. Max. Min. Max.

Input Capacitance 4 10 10

C

IN

C

Output Capacitance 6

OUT

Power Dissipation

C

PD

19 pF

Capacitance (note 1)

1)CPDisdefinedasthevalue oftheIC’sinternal equivalent capacitance whichiscalculated fromtheoperatingcurrent consumption withoutload.(Referto
TestCircuit).Averageoperatingcurrent canbeobtainedbythefollowingequation.I

(opr)=CPD• VCC• fIN+ICC/48(per Gate)

CC

DYNAMICSWITCHING CHARACTERISTICS

Symb o l Parameter Test Con diti ons Val u e Unit

T

V

CC

(V)

V
V

Dynamic Low Voltage

OLP

Quiet Output (note 1, 2)

OLV

Dynamic High Voltage

V

IHD

5.0

5.0 3.5

=50pF

C

L

Min. Typ. Max. Min. Max.

Input (note 1, 3)
Dynamic Low Voltage

V

ILD

5.0 1.5

Input (note 1, 3)

1)Worstcasepackage.

2)Maxnumber ofoutputsdefined as(n). Datainputsaredriven 0V to 5.0V, (n -1)outputsswitching andone outputatGND.

3)Maxnumber ofdatainputs (n)switching.(n-1)switching0Vto5.0V.Inputsundertestswitching:5.0Vtothreshold(V

=25oC -40 to 85oC

A

0.6 0.9

-0.9 -0.6

),0Vtothreshold (V

ILD

),f=1MHz.

IHD

pF
pF

V

TESTCIRCUIT

TEST SWITCH

t

PLH,tPHL

t

PZL,tPLZ

t

PZH,tPHZ

CL= 15/50 pF orequivalent (includes jig and probe capacitance)

=1KΩorequivalent

R

L=R1

R

ofpulsegenerator (typically50Ω)

T=ZOUT

Open

V

CC

GND

4/8

74VHC244

WAVEFORM 1: PROPAGATIONDELAYS

(f=1MHz;50% duty cycle)

WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)

5/8

74VHC244

SO-20 MECHANICAL DATA

DIM.

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

A 2.65 0.104
a1 0.10 0.20 0.004 0.007
a2 2.45 0.096

b 0.35 0.49 0.013 0.019
b1 0.23 0.32 0.009 0.012

C 0.50 0.020

c1 45 (typ.)

D 12.60 13.00 0.496 0.512

E 10.00 10.65 0.393 0.419

e 1.27 0.050
e3 11.43 0.450

F 7.40 7.60 0.291 0.299

L 0.50 1.27 0.19 0.050

M 0.75 0.029

S 8 (max.)

mm inch

6/8

P013L

TSSOP20 MECHANICAL DATA

74VHC244

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 0.19 0.30 0.0075 0.0118

c 0.09 0.2 0.0035 0.0079

D 6.4 6.5 6.6 0.252 0.256 0.260

E 6.25 6.4 6.5 0.246 0.252 0.256

E1 4.3 4.4 4.48 0.169 0.173 0.176

e 0.65 BSC 0.0256 BSC

K0

o

o

4

o

8

o

0

o

4

L 0.50 0.60 0.70 0.020 0.024 0.028

o

8

A2

A

A1

PIN 1 IDENTIFICATION

b

e

K

c

L

E

D

E1

1

7/8

74VHC244

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granted by implicationor otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject tochange without notice. This publication supersedes and replaces all informationpreviously 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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