Datasheet 74ACT541 Datasheet (SGS Thomson Microelectronics)



74ACT541

OCTAL BUS BUFFER

WITH 3 STATE OUTPUTS (NON INVERTED)

■ HIGH SPEED:t

■

LOW POWERDISSIPATION:
I

=8 µA(MAX.) at TA=25oC

CC

■

COMPATIBLEWITHTTLOUTPUTS
V

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

IH

■ 50Ω TRANSMISSIONLINEDRIVING

=4ns(TYP.)atVCC=5V

PD

CAPABILITY

■ SYMMETRICAL OUTPUTIMPEDANCE:

|I

|=IOL=24 mA(MIN)

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

PHL

■

OPERATINGVOLTAGERANGE:
V

(OPR)= 4.5Vto 5.5V

CC

■ PINANDFUNCTION COMPATIBLEWITH

74SERIES541

■ IMPROVEDLATCH-UP IMMUNITY

DESCRIPTION

The ACT541 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
eqivalentBipolar SchottkyTTL.

The 3 STATE control gate operates as a two

B

(PlasticPackage)

(Micro Package)

M

ORDERCODES :

74ACT541B 74ACT541M

input AND such that if eitherG1 and G2 are high,
all eight outputs are in the high impedance state.
In order to enhance PC board layout, the AC541
offers a pinout having inputs and outputs on
opposite sidesof the package.

The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOSoutput voltage 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

December 1998

1/8

74ACT541

INPUT AND OUTPUT EQUIVALENT CIRCUIT

TRUTH TABLE

INPUT OUTPUT

G1 G2 An Yn

HXXZ
XHXZ

LLHH
LLLL

X:”H” or”L”
Z:Highimpedance

PIN DESCRIPTION

PI N No SYM BO L NAM E AND F U NCTIO N

1,19 G1,G2 Output Enable Input

2,3,4,5,

6,7,8,9

18,17,16,
15,14,13,

12, 11

10 GND Ground (0V)
20 V

A1toA8 Data Inputs

Y1toY8 Data Outputs

Positive Supply Voltage

CC

ABSOLUTE MAXIMUM RATINGS

Symb o l P ara met er Val u e Uni t

V

V

V

I

I

OK

I

orI

I

CC

T

T

AbsoluteMaximumRatingsarethosevalues beyondwhichdamagetothedevicemayoccur.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

IK

DC Output Diode Current
DC Output Current ±50 mA

O

DC VCCor Ground Current ±400 mA

GND

Storage Temperature -65to+150

stg

Lead Temperature (10 sec) 300

L

20 mA

±

20 mA

±

o

C

o

C

RECOMMENDED OPERATINGCONDITIONS

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

2/8

74ACT541

DC SPECIFICATIONS

Symbol Parameter Test Conditions Value Unit

T

V

CC

(V)

High Level Input Voltage 4.5 VO=0.1Vor

V

IH

5.5 2.0 1.5 2.0

Low Level Input Voltage 4.5 VO=0.1Vor

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 4 40 µA

-0.1 V

V

CC

V

-0.1 V

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 testduration 2ms,one output loaded attime

2)Incident waveswitchingis guaranteed ontransmission lines withimpedances aslow as50 Ω.

5.5 V

=1.65V max 75 mA

OLD

V

=3.85V min -75 mA

OHD

=25oC -40 to 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

AC ELECTRICAL CHARACTERISTICS

= 50 pF, RL= 500Ω, Input tr=tf=3 ns)

(C

L

Symbol Parameter Test Condition Value Unit

T

=25oC -40 to 85oC

A

Min. Typ. Max. Min. Max.

1.556.51.57.15

1.567.81.58.5

1.567.81.58.5

ns

ns

ns

t

Propagation Delay Time 5.0

PLH

t

PHL

t

Output Enable Time 5.0

PZL

t

PZH

t

Output Disable Time 5.0

PLZ

t

PHZ

(*) Voltagerangeis5V ± 0.5V

V

(V)

CC

(*)

(*)

(*)

CAPACITIVECHARACTERISTICS

Symb ol Pa rameter Tes t Con d i tions Valu e Unit

T

V

CC

(V)

Input Capacitance

C

IN

Power Dissipation

C

PD

5.0

5.0 22 pF

Capacitance (note 1)

1)CPDisdefined asthevalueof theIC’sinternalequivalentcapacitance whichis calculatedfromtheoperatingcurrentconsumption withoutload.(Referto
TestCircuit).Averageoperating current canbeobtained bythefollowingequation. I

(opr)= C

CC

=25oC -40 to 85oC

A

Min. Typ. Max. Min. Max.

4

•

•

f

IN+ICC

/8(per circuit)

V

PD

CC

pF

3/8

74ACT541

TESTCIRCUIT

TEST SWITCH

t

PLH,tPHL

t

PZL,tPLZ

t

PZH,tPHZ

CL= 50 pFor equivalent (includes jigand probe capacitance)

=500Ωorequivalent

R

L=R1

R

ofpulsegenerator(typically50Ω)

T=ZOUT

Open

2V

CC

Open

WAVEFORM 1: PROPAGATIONDELAYS (f=1MHz; 50% duty cycle)

4/8

74ACT541

WAVEFORM 2: OUTPUT ENABLEAND DISABLE TIME

(f=1MHz; 50% duty cycle)

5/8

74ACT541

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

6/8

P001J

SO-20 MECHANICAL DATA

74ACT541

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

7/8

74ACT541

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granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change 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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