SGS Thomson Microelectronics M74HC280 Datasheet
.HIGH SPEED
tPD= 22 ns(TYP.) at VCC=5V
.LOWPOWERDISSIPATION
ICC=4µA(MAX.) at TA=25°C6 V
.HIGH NOISEIMMUNITY
V
NIH=VNIL
=28%VCC(MIN.)
.OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.SYMMETRICALOUTPUT IMPEDANCE
IOH =IOL= 4 mA (MIN.)
.BALANCEDPROPAGATION DELAYS
t
PLH=tPHL
.WIDE OPERATINGVOLTAGE RANGE
VCC(OPR)= 2V to 6 V
.PIN AND FUNCTION COMPATIBLE WITH
54/74LS280
M54HC280
M74HC280
9 BIT PARITYGENERATOR
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC 280F1R M74H C280M1R
M74HC 280B1R M74HC2 80C1R
F1R
(CeramicPackage)
C1R
(Chip Carrier)
DESCRIPTION
The M54/74HC280 is a high speed CMOS 9-BIT
PARITY GENERATOR fabricated in silicon gate
C2MOStechnology. Ithasthesamehighspeedperformance of LSTTLcombined with true CMOSlow
consumption.
It is composed of nine data inputs (A to I) and
odd/even parityoutputs (Σ ODD and Σ EVEN). The
ninedatainputscontrol the output conditions. When
the number ofhighlevel inputs isodd,ΣODDoutput
is kept high and ΣEVEN output low. Conversely,
when the number is even , ΣEVEN output is kept
high and ΣODD low.
This ICgenerates either odd or even parity making
it flexibleapplication.
The word-length capability is easily expanded by
cascading.
All inputs are equipped with protection circuits
against static discharge and transient excess voltage.
PIN CONNECTIONS(top view)
NC =
No Internal
Connection
October 1992
1/10
M54/M74HC280
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
NUMBER OF INPUTS A THRU I THAT ARE HIGH
LOGI C DIAGRAM
OUTPUT
Σ EVEN Σ ODD
0, 2, 4, 6, 8 H L
1, 3, 5, 7, 9 L H
2/10
M54/M74HC280
PIN DESCRIPTION
IEC LOGIC SYMBOL
PIN No SYMBOL NAME AND FUNCTION
5, 6 Σ EVEN,
Parity Outputs
Σ ODD
8, 9, 10,
A to I Data Inputs
11, 12, 13,
1, 2, 4
3 NC No Connection
7 GND Ground (0V)
14 V
CC
Positive Supply Voltage
ABSOLU TE MAXIMU M RAT INGS
Symbol Parameter Value Unit
V
CC
V
V
O
I
IK
I
OK
I
O
or I
I
CC
P
D
T
stg
T
AbsoluteMaximumRatingsarethose values beyond whichdamage tothedevicemayoccur. Functional operation under these conditionisnotimplied.
(*)500 mW: ≅ 65oC derateto300mWby 10mW/oC: 65oCto85oC
Supply Voltage -0.5 to +7 V
DC Input Voltage -0.5 to VCC+ 0.5 V
I
DC Output Voltage -0.5 to VCC+ 0.5 V
DC Input Diode Current ± 20 mA
DC Output Diode Current ± 20 mA
DC Output Source Sink Current Per Output Pin ± 25 mA
DC VCCor Ground Current ± 50 mA
GND
Power Dissipation 500 (*) mW
Storage Temperature -65 to +150
Lead Temperature (10 sec) 300
L
o
C
o
C
RECO MM ENDED OPERATIN G CONDI TIONS
Symbol Parameter Value Unit
V
T
t
V
V
r,tf
Supply Voltage 2 to 6 V
CC
Input Voltage 0 to V
I
Output Voltage 0 to V
O
Operating Temperature: M54HC Series
op
M74HC Series
CC
CC
-55 to +125
-40 to +85
Input Rise and Fall Time VCC= 2 V 0 to 1000 ns
V
= 4.5 V 0 to 500
CC
= 6 V 0 to 400
V
CC
V
V
o
C
o
C
3/10
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