ST M74HC540 User Manual

M74HC540

OCTAL BUS BUFFER

WITH 3 STATE OUTPUTS (INVERTED)

■ HIGH SPEED:

t

= 9ns (TYP.) at VCC = 6V

PD

■ LOW POWER DISSIPATION:

I

= 4µA(MAX.) at TA=25°C

CC

■ HIGH NOISE IMMUNITY:

V

= V

NIH

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

| = IOL = 6mA (MIN)

OH

■ BALANCED PROPAGATION DELAYS:

t

≅ t

PLH

■ WIDE OPERATING VOLTAGE RANGE:

V

(OPR) = 2V to 6V

CC

■ PIN AND FUNCTION COMPATIBLE WITH

= 28 % VCC (MIN.)

NIL

PHL

74 SERIES 540

DESCRIPTION

The 74HC540 is an advanced high-speed CMOS
OCTAL BUS BUFFER (3-ST ATE) fabricated with
silicon C

2

MOS technology. The M74HC541 i s 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

TSSOPDIP SOP

ORDER CODES

PACKAGE TUBE T & R

DIP M74HC540B1R

SOP M74HC540M1R M74HC540RM13TR

TSSOP M74HC540TTR

order to enhance PC board layout the M74HC540
offer a pinout having inputs and outputs on
opposite sides of the package.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

1/10August 2001

M74HC540

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

V

V

I

I

OK

I

I

or I

CC

P

T

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

2/10

M74HC540

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Value Unit

V

V

V

T

t

r

DC SPECIFICATIONS

Symbol Parameter

V

IH

V

IL

V

OH

V

OL

I

I

I

OZ

I

CC

Supply Voltage

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature

op

Input Rise and Fall Time VCC = 2.0V

, t

f

V
V

= 4.5V

CC

= 6.0V

CC

Test Condition Value

T

= 25°C

A

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

High Level Input

V

CC

(V)

2.0 1.5 1.5 1.5

Voltage

6.0 4.2 4.2 4.2

Low Level Input

2.0 0.5 0.5 0.5

Voltage

6.0 1.8 1.8 1.8

High Level Output
Voltage

Low Level Output
Voltage

Input Leakage
Current

High Impedance
Output Leakage
Current

Quiescent Supply
Current

2.0

4.5

6.0

4.5

6.0

2.0

4.5

6.0

4.5

6.0

6.0

6.0

6.0

IO=-20 µA
I

=-20 µA

O

I

=-20 µA

O

I

=-6.0 mA

O

I

=-7.8 mA

O

=20 µA

I

O

I

=20 µA

O

I

=20 µA

O

I

=6.0 mA

O

I

=7.8 mA

O

= VCC or GND

V

I

= VIH or V

V

I

IL

VO = VCC or GND

= VCC or GND

V

I

1.9 2.0 1.9 1.9

4.4 4.5 4.4 4.4

5.9 6.0 5.9 5.9

4.18 4.31 4.13 4.10

5.68 5.8 5.63 5.60

0.0 0.1 0.1 0.1

0.0 0.1 0.1 0.1

0.0 0.1 0.1 0.1

0.17 0.26 0.33 0.40

0.18 0.26 0.33 0.40

± 0.1 ± 1 ± 1 µA

± 0.5 ± 5 ± 10 µA

44080µA

2 to 6 V

CC
CC

-55 to 125 °C

0 to 1000 ns

0 to 500 ns
0 to 400 ns

-40 to 85°C -55 to 125°C

V
V

Unit

V4.5 3.15 3.15 3.15

V4.5 1.35 1.35 1.35

V

V

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