Datasheet 74ACT244 Datasheet (SGS Thomson Microelectronics)



74ACT244

OCTAL BUS BUFFER

WITH 3 STATE OUTPUTS (NON INVERTED)

■ HIGH SPEED:t

■

LOW POWERDISSIPATION:
I

=8 µA(MAX.) at TA=25oC

CC

■

COMPATIBLEWITH TTL OUTPUTS
V

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

IH

■ 50Ω TRANSMISSIONLINEDRIVING

=4.5ns (TYP.)atVCC=5V

PD

CAPABILITY

■ SYMMETRICAL OUTPUTIMPEDANCE:

|I

|=IOL=24 mA(MIN)

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

PHL

■

OPERATINGVOLTAGERAN GE:
V

(OPR)= 4.5Vto 5.5V

CC

■ PINANDFUNCTION COMPATIBLEWITH

74SERIES244

■ IMPROVEDLATCH-UPIMMUNITY

DESCRIPTION

The ACT244 is an advanced CMOS OCTAL BUS
BUFFER (3-STATE) fabricated with sub-micron
silicon gate and double-layermetal wiring C

2

MOS
technology. It is ideal for low power applications
mantaining high speed operation similar to
equivalentBipolar Schottky TTL.

M

(Micro Package)

B

(PlasticPackage)

ORDER CODES:

74ACT244B

74ACT244M

(TSSOPPackage)

T

74ACT244T

G control output governsfourBUS BUFFERs.
This device is desibned to be used with 3 state

memoryaddressdrivers, etc.
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOSoutputvoltage levels.

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

February 1999

1/9

74ACT244

INPUT AND OUTPUT EQUIVALENTCIRCUIT

TRUTH TABLE

INPUT OUTPU T

GAnYn

LLL
LHH

HXZ

X:”H” or”L”
Z:Highimpedance

PIN DESCRIPTION

PI N No SYM BO L NAM E AN D FUNCTION

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 Enabel Input
10 GND Ground (0V)
20 V

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

AbsoluteMaximumRatingsarethosevaluesbeyond whichdamagetothedevice mayoccur. Functionaloperationunderthese condition isnotimplied.

Supply Voltage -0.5to+7 V

CC

DC Input Voltage -0.5toVCC+0.5 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 ±50 mA

O

DC VCCor Ground Current ±400 mA

GND

Storage Temperature -65to+150

stg

Lead Temperature (10 sec) 300

L

o

C

o

C

RECOMMENDED OPERATING CONDITIONS

Symb o l Parameter Val u e Uni t

V

V

V

T

dt/dv Input Rise and Fall Time V

1)VINfrom0.8V to2.0V

Supply Voltage 4.5to5.5 V

CC

Input Voltage 0toV

I

Output Voltage 0toV

O

Operating Temperature: -40to+85

op

= 4.5 to 5.5V (note 1) 8 ns/V

CC

CC
CC

V
V

o

C

2/9

74ACT244

DC SPECIFICATIONS

Symbol Parameter Test Conditions Value Unit

T

V

CC

(V)

High Level Input Voltage 4.5 VO=0.1V or

V

IH

5.5 2.0 1.5 2.0

Low Level Input Voltage 4.5 VO=0.1V or

V

IL

5.5 1.5 0.8 0.8

High Level Output

V

OH

Voltage

4.5

5.5 I

V

V

4.5 I

5.5 I

Low Level Output

V

OL

Voltage

4.5

5.5 I

V

V

4.5 I

5.5 I

Input Leakage Current 5.5 VI=VCCorGND ±0.1 ±1 µA

I

I

3 State Output Leakage

I

OZ

5.5 VI=VIHorV

Current
Max ICC/Input 5.5 VI=VCC-2.1V 0.6 1.5 mA

I

CCT

Quiescent Supply

I

CC

5.5 VI=VCCorGND 8 80 µA

-0.1V

V

CC

V

-0.1V

CC

IO=-50µA 4.4 4.49 4.4

(*)

=

I

or

IH

V

IL

(*)

I

or

IH

V

IL

=-50µA 5.4 5.49 5.4

O

=-24 mA 3.86 3.76

O

=-24 mA 4.86 4.76

O

IO=50µA 0.001 0.1 0.1

=

=50mA 0.001 0.1 0.1

O

=24mA 0.36 0.44

O

=24mA 0.36 0.44

O

IL

VO=VCCorGND

Current
Dynamic Output Current

I

OLD

(note 1, 2)

I

OHD

1) Maximum test duration 2ms, one output loaded attime

2)Incidentwave switchingisguaranteed ontransmission lineswithimpedances aslowas 50 Ω.
(*)All outputs loaded.

5.5 V

=1.65V max 75 mA

OLD

V

=3.85V min -75 mA

OHD

=25oC -40 t o 85oC

A

Min. Typ. Max. Min. Max.

2.0 1.5 2.0

1.5 0.8 0.8

±0.5 ±5 µA

V

V

V

V

3/9

74ACT244

AC ELECTRICAL CHARACTERISTICS (CL= 50 pF, RL= 500 Ω, Input tr=tf=3 ns)

Symbol Parameter Test Condition Value Unit

V

CC

(V)

t

Propagation Delay Time 5.0

PLH

t

PHL

Output Enable Time 5.0

t

PZL

t

PZH

t

Output Disable Time 5.0

PLZ

t

PHZ

(*)Voltagerange is5V ±0.5V

(*)

(*)

(*)

CAPACITIVE CHARACTERISTICS

Symbol Parameter Test Conditions Value Unit

V

CC

(V)

C

Input Capacitance

IN

I/O Capacitance

C

i/o

Power Dissipation

C

PD

Capacitance (note 1)

1)CPDisdefinedasthevalueoftheIC’sinternal equivalentcapacitance whichis calculated fromtheoperatingcurrentconsumption withoutload.(Referto
TestCircuit).Average operatingcurrent canbeobtained bythefollowingequation.I

5.0

5.0

5.0 24 pF

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

CC

T

=25oC -40 t o 85oC

A

Min. Typ. Max. Min. Max.

1.5 4.5 9.0 1.5 10.0 ns

1.5 5.5 9.0 1.5 10.0 ns

1.5 6.5 10.0 1.5 11.0 ns

=25oC -40 t o 85oC

T

A

Min. Typ. Max. Min. Max.

4
8

pF
pF

TESTCIRCUIT

TEST SWITCH

t

PLH,tPHL

t

PZL,tPLZ

t

PZH,tPHZ

CL= 50 pF or equivalent (includes jig and probe capacitance)

=500Ω orequivalent

R

L=R1

R

ofpulsegenerator(typically50Ω)

T=ZOUT

Open

2V

CC

Open

4/9

74ACT244

WAVEFORM 1: PROPAGATIONDELAYS

(f=1MHz;50% dutycycle)

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

5/9

74ACT244

Plastic DIP-20 (0.25) MECHANICAL DATA

DIM.

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

a1 0.254 0.010

B 1.39 1.65 0.055 0.065
b 0.45 0.018

b1 0.25 0.010

D 25.4 1.000

E 8.5 0.335
e 2.54 0.100

e3 22.86 0.900

F 7.1 0.280

I 3.93 0.155
L 3.3 0.130
Z 1.34 0.053

mm inch

6/9

P001J

SO-20 MECHANICAL DATA

74ACT244

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

P013L

7/9

74ACT244

TSSOP20 MECHANICAL DATA

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

A

PIN 1 IDENTIFICATION

8/9

A2

A1

b

e

K

c

L

E

D

E1

1

74ACT244

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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 implication or 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 notauthorized for use as critical components inlife support devices or systems without express written approval of STMicroelectronics.

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