Datasheet 74AC280 Datasheet (SGS Thomson Microelectronics)



74AC280

9 BIT PARITY GENERATOR

■ HIGHSPEED:t

■

LOW POWER DISSIPATION:
I

=4 µA (MAX.)at TA=25oC

CC

■

HIGHNOISEIMMUNITY:
V

NIH=VNIL

■ 50Ω TRANSMISSIONLINEDRIVING

=28%VCC(MIN.)

=4ns (TYP.)atVCC=5V

PD

CAPABILITY

■ SYMMETRICALOUTPUTIMPEDANCE:

|I

|=IOL=24mA(MIN)

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

PHL

■

OPERATINGVOLTAGERANGE:
V

(OPR)= 2Vto6V

CC

■ PINANDFUNCTIONCOMPATIBLEWITH

74SERIES280

■ IMPROVEDLATCH-UPIMMUNITY

DESCRIPTION

The AC280 is an advanced high-speed CMOS 9
BIT PARITY GENERATOR fabricated with
sub-micron silicon gate and double-layer metal
wiring C

2

MOS technology. It is ideal for low
power applications mantaining high speed
operation similar to equivalent Bipolar Schottky
TTL.
It is composed of nine data inputs (A to I) and

B

(PlasticPackage)

(Micro Package)

M

ORDERCODES :

74AC280B 74AC280M

odd/evenparity outputs (ΣODD andΣEVEN).The
nine data inputs control the output conditions.
When the number of high level input is odd,

Σ

ODD outputis kept high andΣEVEN outputlow.
Conservely, when the output is even, ΣEVEN
output is kept highand ΣODD low.

The IC generates either odd or even parity
makingit flexibleapplication.

The word-length capability is easily expanded by
cascading.

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 LOGICSYMBOLS

December 1998

1/8

74AC280

INPUT AND OUTPUTEQUIVALENTCIRCUIT

TRUTH TABLE

NUMBER OF INPUT S A THRU I THAT ARE HIG H OUT P UT

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

LOGICDIAGRAM

PIN DESCRIPTION

PI N No SYMB OL NAME AND FUNCT I O N

5, 6

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

4
3 NC No Connection

7 GND Ground (0V)

14 V

EVEN

Σ

ΣODD

A toI Data Inputs

CC

EVEN

Σ

Parity Outputs

Positive Supply Voltage

Σ

ODD

2/8

74AC280

ABSOLUTE MAXIMUM RATINGS

Symb o l Para met er Val u e Uni t

V

V

V

I

I

OK

I

or I

I

CC

T

T

AbsoluteMaximumRatingsarethosevaluesbeyondwhichdamageto thedevicemayoccur.Functionaloperationunderthesecondition isnotimplied.

RECOMMENDED OPERATING CONDITIONS

Symb o l Para met er Value Un it

V

V

V

T

dt/dv Input Rise and Fall Time V

1)VINfrom30%to70%of V

Supply Voltage -0.5 to +7 V

CC

DC Input Voltage -0.5 to VCC+ 0.5 V

I

DC Output Voltage -0.5 to VCC+ 0.5 V

O

DC Input Diode Current ± 20 mA

IK

DC Output Diode Current ± 20 mA
DC Output Current

O

DC VCCor Ground Current

GND

Storage Temperature -65 to +150

stg

Lead Temperature (10 sec) 300

L

Supply Voltage 2 to 6 V

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature: -40 to +85

op

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

CC

CC

50 mA

±

200 mA

±

CC
CC

o

C

o

C

V
V

o

C

3/8

74AC280

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

-0.1 V

V

CC

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

-0.1 V

CC

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=VCCor GND ±0.1 ±1 µA

I

I

Quiescent Supply

I

CC

3.0

4.5 I

5.5 I

V
V

3.0 I

4.5 I

5.5 I

3.0

4.5 I

5.5 I

V
V

3.0 I

4.5 I

5.5 I

IO=-50 µA 2.9 2.99 2.9

(*)

I
IH

V

IL

=-50 µA 4.4 4.49 4.4

O

=

=-50 µA 5.4 5.49 5.4

or

O

=-12 mA 2.56 2.46

O

=-24 mA 3.86 3.76

O

=-24 mA 4.86 4.76

O

IO=50 µA 0.002 0.1 0.1

(*)

I
IH

V

IL

=50 µA 0.001 0.1 0.1

O

=

=50µA 0.001 0.1 0.1

or

O

=12 mA 0.36 0.44

O

=24 mA 0.36 0.44

O

=24 mA 0.36 0.44

O

5.5 VI=VCCor GND 4 40

Current
Dynamic Output Current

I

OLD

OHD

(note 1, 2)

I

1) Maximumtest duration 2ms,one output loaded attime

2)Incident waveswitchingisguaranteed ontransmission lineswithimpedancesaslow as50 Ω.
(*)All outputs loaded.

5.5 V

= 1.65 V max 75 mA

OLD

V

= 3.85 V 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

µ

V

V

V

V

A

AC ELECTRICAL CHARACTERISTICS

= 50 pF, RL= 500 Ω, Inputtr=tf=3 ns)

(C

L

Symbol Parameter Test Condition Value Unit

t

Propagation Delay Time

PLH

t

(Input - ΣODD, ΣEVEN)

PHL

(*) Voltagerangeis 3.3V± 0.3V
(**) Voltagerangeis 5V± 0.5V

V

3.3

5.0

CC

(V)

(*)

(**)

=25oC -40 to 85oC

T

A

Min. Typ. Max. Min. Max.

1.5 5 17.0 1 18.5

1.5 4 13.0 1 14.5

ns

CAPACITIVE CHARACTERISTICS

Symbol Parameter Test Conditions Value Unit

V

CC

(V)

C

Input Capacitance

IN

Power Dissipation

C

PD

5.0

5.0 27 pF

Capacitance (note 1)

1)CPDisdefined asthevalue oftheIC’sinternal equivalentcapacitance whichis calculatedfromtheoperatingcurrentconsumption without load.(Referto
TestCircuit).Average operatingcurrent canbeobtainedbythefollowingequation.I

(opr)= CPD• VCC• fIN+I

CC

4/8

=25oC -40 to 85oC

T

A

Min. Typ. Max. Min. Max.

4

CC

pF

TESTCIRCUIT

CL= 50 pF or equivalent (includes jigand probe capacitance)
R

=500Ωorequivalent

L=R1

R

ofpulse generator (typically50Ω)

T=ZOUT

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

74AC280

5/8

74AC280

Plastic DIP-14 MECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.51 0.020

B 1.39 1.65 0.055 0.065
b 0.5 0.020

b1 0.25 0.010

D 20 0.787

E 8.5 0.335
e 2.54 0.100

e3 15.24 0.600

F 7.1 0.280

I 5.1 0.201
L 3.3 0.130
Z 1.27 2.54 0.050 0.100

mm inch

6/8

P001A

SO-14 MECHANICALDATA

74AC280

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.75 0.068

a1 0.1 0.2 0.003 0.007
a2 1.65 0.064

b 0.35 0.46 0.013 0.018

b1 0.19 0.25 0.007 0.010

C 0.5 0.019

c1 45 (typ.)

D 8.55 8.75 0.336 0.344

E 5.8 6.2 0.228 0.244
e 1.27 0.050

e3 7.62 0.300

F 3.8 4.0 0.149 0.157

G 4.6 5.3 0.181 0.208

L 0.5 1.27 0.019 0.050

M 0.68 0.026

S 8 (max.)

mm inch

P013G

7/8

74AC280

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granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in thispublication are
subject tochange withoutnotice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices orsystems without express written approval ofSTMicroelectronics.

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