Datasheet M74HCT540 Datasheet (ST)

M74HCT540

OCTAL BUS BUFFER

WITH 3 STATE OUTPUTS (INVERTED)

■ HIGH SPEED:

t

= 12ns (TYP.) at VCC = 4.5V

PD

■ LOW POWER DISSIPATION:

I

= 4µA(MAX.) at TA=25°C

CC

■ COMPA TIBLE WITH TTL OUTPUTS :

V

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

IH

■ BALANCED PROPAGATION DELAYS:

t

≅ t

PLH

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

OH

■ PIN AND FUNCTION COMPATIBLE WITH

PHL

| = IOL = 6mA (MIN)

74 SERIES 540

DESCRIPTION

The 74HCT540 is an advanced high-speed CMOS OCTAL BUS BUFFER (3-STATE) fabricated with silicon gate C

2

MOS technology. The M74HCT540 is an inverting buffer. The 3-STATE control gate operates as a two input AND such that if either G1

and G2 are high, all eight output a re in the high impedance state. In order to enhance PC board layout the M74HCT540 offer a pinout having inputs and outputs on opposite sides of the package.

TSSOPDIP SOP

ORDER CODES

PACKAGE TUBE T & R

DIP M74HCT540B1R

SOP M74HCT540M1R M74HCT540RM13TR

TSSOP M74HCT540TTR

The M74HCT540 is designed to directly interface

2

HSC

MOS systems with TTL and NMOS components. All inputs are equipped with protection circuits against static discharge and transient excess voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

1/9August 2001

M74HCT541

INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION

PIN No SYMBOL NAME AND FUNCTION

1, 19 G1

2, 3, 4, 5, 6,

7, 8, 9

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

12, 11

10 GND Ground (0V) 20 V

TRUTH TABLE

INPUT OUTPUT

, G2 Output Enable Inputs

A1 to A8 Data Inputs

Y1

to Y8 Bus Outputs

CC

Positive Supply Voltage

G1

G2 An Yn

HXXZ XHXZ

LLHL LLLH

X : Don’t Care Z : High Impedance

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

I

OK

I

or I

CC

P

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied (*) 500mW at 65

Supply Voltage

CC

DC Input Voltage -0.5 to VCC + 0.5

I

DC Output Voltage -0.5 to VCC + 0.5

O

DC Input Diode Current

IK

DC Output Diode Current DC Output Current

O

DC VCC or Ground Current

GND

Power Dissipation

D

Storage Temperature

stg

Lead Temperature (10 sec)

L

; derate to 30 0m W by 10mW/°C from 65

°C

°C to 85°C

-0.5 to +7 V V V

± 20 mA ± 20 mA ± 35 mA ± 70 mA

500(*) mW

-65 to +150 °C

300 °C

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Value Unit

2/9

V

V T t

r

Supply Voltage

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature

op

, t

Input Rise and Fall Time (VCC = 4.5 to 5.5V)

f

4.5 to 5.5 V

CC CC

-55 to 125 °C 0 to 500 ns

V V

DC SPECIFICATIONS

Symbol Parameter

V

I

∆ I

High Level Input

IH

Voltage

Low Level Input

IL

Voltage

High Level Output

OH

Voltage Low Level Output

OL

Voltage

I

Input Leakage

I

Current High Impedance

OZ

Output Leakage Current

Quiescent Supply

CC

Current Additional Worst

CC

Case Supply Current

Test Condition Value

T

= 25°C

V

CC

(V)

A

Min. Typ. Max. Min. Max. Min. Max.

4.5 to

2.0 2.0 2.0 V

5.5

4.5 to

0.8 0.8 0.8 V

5.5

4.5

5.5

IO=-20 µA

I

=-6.0 mA

O

IO=20 µA

I

=6.0 mA

O

= VCC or GND

V

I

= VIH or V

V

I

VO = VCC or GND

= VCC or GND

V

I

5.5 Per Input pin

= 0.5V or

V

I

V

= 2.4V

I

4.4 4.5 4.4 4.4

4.18 4.31 4.13 4.10

0.0 0.1 0.1 0.1

0.17 0.26 0.33 0.40 ± 0.1 ± 1 ± 1 µA

IL

± 0.5 ± 5 ± 10 µA

2.0 2.9 3.0 mA

Other Inputs at

V

or GND

CC

M74HCT541

-40 to 85°C -55 to 125°C

44080µA

Unit

V

AC ELECTRICAL CHARACTERISTICS (C

Test Condition Value

Symbol Parameter

t

TLH tTHL

t

PLH tPHL

t

PZL tPZH

t

PLZ tPHZ

Output Transition Time

Propagation Delay Time

Output Enable Time

Output Disable Time

C

V

CC

(V)

(pF)

L

4.5 50 6 12 15 18 ns

4.5 50 12 20 25 30

4.5 150 16 25 31 38

4.5 50

4.5 150 22 34 43 51

4.5 50

= 50 pF, Input tr = tf = 6ns)

L

= 25°C

T

A

Min. Typ. Max. Min. Max. Min. Max.

= 1 KΩ

R

L

= 1 KΩ

R

L

18 30 38 45

19 27 34 41 ns

-40 to 85°C -55 to 125°C

Unit

ns

3/9

M74HCT541

CAPACITIVE CHARACTERISTICS

Test Condition Value

T

Symbol Parameter

V

CC

(V)

C

1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without

load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I

Input Capacitance

IN

Power Dissipation

PD

Capacitance (note 1)5.0 34 pF

5.0 5101010pF

= 25°C

A

Min. Typ. Max. Min. Max. Min. Max.

TEST CIRCUIT

-40 to 85°C -55 to 125°C

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

CC(opr)

Unit

TEST SWITCH

t

, t

PLH

PHL

, t

t

PZL

PLZ

t

, t

PZH

PHZ

CL = 50pF/150p F or equivalen t (includes j i g and probe capacitance )

= 1KΩ or equivalent

R

1

= Z

R

of pulse generator (typically 50Ω)

T

OUT

Open

V

CC

GND

4/9

WAVEFORM 1: PROPAGATION DELAY TIMES (f=1MHz; 50% duty cycle)

M74HCT541

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

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M74HCT541

Plastic DIP-20 (0.25) MECHANICAL DATA

mm. inch

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

6/9

P001J

SO-20 MECHANICAL DATA

M74HCT541

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 2.65 0.104 a1 0.1 0.2 0.004 0.008 a2 2.45 0.096

b 0.35 0.49 0.014 0.019

b1 0.23 0.32 0.009 0.012

C 0.5 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 0.300

L 0.50 1.27 0.020 0.050

M 0.75 0.029

S8° (max.)

mm. inch

PO13L

7/9

M74HCT541

TSSOP20 MECHANICAL DATA

mm. inch

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 1.2 0.047

A1 0.05 0.15 0.002 0.004 0.006

A2 0.8 1 1.05 0.031 0.039 0.041

b 0.19 0.30 0.007 0.012

c 0.09 0.20 0.004 0.0089

D 6.4 6.5 6.6 0.252 0.256 0.260

E 6.2 6.4 6.6 0.244 0.252 0.260

E1 4.3 4.4 4.48 0.169 0.173 0.176

e 0.65 BSC 0.0256 BSC

K0° 8°0° 8°

L 0.45 0.60 0.75 0.018 0.024 0.030

A2

A

A1

b

e

K

c

L

E

D

E1

PIN 1 IDENTIFICATION

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1

0087225C

M74HCT541

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