ST M74HC280 User Manual

M74HC280

9 BIT PARITY GENERATOR

■ HIGH SPEED :

t

= 22ns (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 = 4mA (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 280

DESCRIPTION

The M74HC280 is an high speed CMOS 9-BIT
PARITY GENERATOR fabricated with sili con gate

2

C

MOS technology.
It is composed of nine data inputs (A to I) and odd/
even parity outputs (ΣODD and ΣEVEN). The nine
data inputs control the output conditions. When
the number of high level input is odd, ΣODD
output is kept high and ΣEVEN output low.

TSSOPDIP SOP

ORDER CODES

PACKAGE TUBE T & R

DIP M74HC280B1R

SOP M74HC280M1R M74HC280RM13TR

TSSOP M74HC280TTR

Conversely, when the output is even, ΣEVEN
output is kept high and ΣODD low.
The IC generates either odd or even parity making
it flexible application. The word-length capability is
easily expanded by cascading.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

1/9July 2001

M74HC280

INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION

PIN No SYMBOL NAME AND FUNCTION

5, 6

8, 9, 10, 11,
12, 13, 1, 2,

4
3 NC No Connection
7 GND Ground (0V)

14

TRUTH TABLE

ΣEVEN

ΣΟDD

A to I Data Inputs

V

CC

Parity Outputs

Positive Supply Voltage

NUMBER OF INPUTS A - I THAT ARE HIGH

LOGIC DIAGRAM

OUTPUTS

ΣEVEN ΣODD

0, 2, 4, 6, 8 H L
1, 3, 5, 7, 9 L H

2/9

M74HC280

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

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Value Unit

V

V

V

T

t

r

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

°C; derate to 300mW by 10mW/°C from 65°C to 85°C

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

CC
CC

= 4.5V
= 6.0V

-0.5 to +7 V

± 20 mA
± 20 mA
± 25 mA
± 50 mA

500(*) mW

-65 to +150 °C

300 °C

2 to 6 V

CC
CC

-55 to 125 °C
0 to 1000 ns

0 to 500 ns
0 to 400 ns

V
V

V
V

3/9