Datasheet 74AC541 Datasheet (SGS Thomson Microelectronics)



74AC541

OCTAL BUS BUFFER

WITH 3 STATE OUTPUTS (NON INVERTED)

■ HIGH SPEED:t

■

LOW POWERDISSIPATION:
I

=8 µA(MAX.) at TA=25oC

CC

■

HIGH NOISEIMMUNITY:
V

NIH=VNIL

■ 50Ω TRANSMISSIONLINEDRIVING

=28%VCC(MIN.)

=4ns(TYP.)atVCC=5V

PD

CAPABILITY

■ SYMMETRICAL OUTPUTIMPEDANCE:

|I

|=IOL=24 mA(MIN)

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

PHL

■

OPERATINGVOLTAGERANGE:
V

(OPR)= 2Vto 6V

CC

■ PINANDFUNCTIONCOMPATIBLEWITH

74SERIES541

■ IMPROVEDLATCH-UP IMMUNITY

DESCRIPTION

The AC541 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

B

(PlasticPackage)

(Micro Package)

M

ORDERCODES :

74AC541B 74AC541M

equivalentBipolarSchottky TTL.
The 3 STATE control gate operates as a two

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.
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

November 1998

1/8

74AC541

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 P ara met er Value Un it

V

V

V

T

dt/dv Input Rise and Fall Time V

1)VINfrom30%to70%of V

Supply Voltage 2to6 V

CC

Input Voltage 0toV

I

Output Voltage 0toV

O

Operating Temperature: -40to+85

op

= 3.0, 4.5 or 5.5 V(note 1) 8 ns/V

CC

CC

CC
CC

V
V

o

C

2/8

74AC541

DC SPECIFICATIONS

Symbol Parameter Test Conditions Value Unit

T

V

CC

(V)

High Level Input Voltage 3.0 VO=0.1V or

V

IH

4.5 3.15 2.25 3.15

V

CC

-0.1V

5.5 3.85 2.75 3.85

Low Level Input Voltage 3.0 VO=0.1V or

V

IL

4.5 2.25 1.35 1.35

V

CC

-0.1V

5.5 2.75 1.65 1.65

High Level Output

V

OH

Voltage

Low Level Output

V

OL

Voltage

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

I

I

3 State Output Leakage

I

OZ

Current
Quiescent Supply

I

CC

3.0

4.5 I

5.5 I

3.0 I

V

I

V

IH

V

4.5 I

5.5 I

3.0

4.5 I

5.5 I

3.0 I

V

I

V

IH

V

4.5 I

5.5 I

5.5 VI=VIHorV

IO=-50µA 2.9 2.99 2.9

(*)

or

IL

=-50µA 4.4 4.49 4.4

O

=

=-50µA 5.4 5.49 5.4

O

=-12 mA 2.56 2.46

O

=-24 mA 3.86 3.76

O

=-24 mA 4.86 4.76

O

IO=50µA 0.002 0.1 0.1

(*)

=

or

IL

=50µA 0.001 0.1 0.1

O

=50

µΑ

O

=12mA 0.36 0.44

O

=24mA 0.36 0.44

O

=24mA 0.36 0.44

O

IL

VO=VCCorGND

5.5 VI=VCCorGND 8 80 µA

Current
Dynamic Output Current

I

OLD

(note 1, 2)

I

OHD

1) Maximum testduration 2ms,one output loaded attime

2)Incidentwaveswitchingisguaranteed ontransmissionlineswithimpedances aslowas50 Ω.
(*)All outputs loaded.

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.

2.1 1.5 2.1

1.5 0.9 0.9

0.001 0.1 0.1

0.5

±

5

±

µ

V

V

V

V

A

3/8

74AC541

AC ELECTRICAL CHARACTERISTICS

= 50 pF, RL= 500 Ω, Input tr=tf=3 ns)

(C

L

Symbol Parameter Test Condition Value Unit

t

Propagation Delay Time 3.3

PLH

t

PHL

t

Output Enable Time 3.3

PZL

t

PZH

t

Output Disable Time 3.3

PLZ

t

PHZ

(*) Voltagerangeis3.3V± 0.3V
(**) Voltagerangeis5V± 0.5V

V

(V)

5.0

5.0

5.0

CC

(*)

(**)

(*)

(**)

(*)

(**)

T

=25oC -40 to 85oC

A

Min. Typ. Max. Min. Max.

1.5 5 8 1.5 9

1.546.51.57

1.5 7 10.5 1.5 11.5

1.5 5 8 1.5 8.5

1.5 7 10.5 1.5 11.5

1.5 6 9 1.5 9.5

ns

ns

ns

CAPACITIVECHARACTERISTICS

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

V

CC

(V)

Input Capacitance

C

IN

C

Output Capacitance 5.0 8 pF

OUT

Power Dissipation

C

PD

5.0

5.0 21 pF

Capacitance (note 1)

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

(opr)= CPD• VCC• fIN+ICC/8(per circuit)

CC

=25oC -40 to 85oC

T

A

Min. Typ. Max. Min. Max.

4

pF

TESTCIRCUIT

TEST SWITCH

t

PLH,tPHL

t

PZL,tPLZ

t

PZH,tPHZ

CL= 50 pFor equivalent (includes jigand probe capacitance)
R

=500Ωorequivalent

L=R1

R

ofpulsegenerator (typically50Ω)

T=ZOUT

Open

2V

CC

Open

4/8

74AC541

WAVEFORM 1: PROPAGATIONDELAYS

(f=1MHz;50% duty cycle)

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

5/8

74AC541

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

74AC541

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

74AC541

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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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