74HC280; 74HCT280

9-bit odd/even parity generator/checker

The 74HC280; 74HCT280 is a 9-bit parity generator or checker. Both even and odd parity outputs are available. The even parity output (PE) is HIGH when an even number of data inputs (I0 to I8) is HIGH. The odd parity output (PO) is HIGH when an odd number of data inputs are HIGH. Expansion to larger word sizes is accomplished by tying the even outputs (PE) of up to nine parallel devices to the final stage data inputs. Inputs include clamp diodes. It enables the use of current limiting resistors to interface inputs to voltages in excess of VCC

Features and benefits

  • Complies with JEDEC standard no. 7A
  • Input levels:
    • For 74HC280: CMOS level
    • For 74HCT280: TTL level
  • Word-length easily expanded by cascading
  • Generates either odd or even parity for nine data bits
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Specified from -40 °C to +85 °C and -40 °C to +125 °C


Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74HC280DProduction2.0 - 6.0CMOS± 5.217low-40~125731.030SO14
74HCT280DProduction4.5 - 5.5TTL± 418low-40~125761.034SO14


Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
Reel 13" Q1/T1 CECCActive74HC280D74HC280D,653
( 9337 138 80653 )
Bulk Pack, CECCActive74HC280D74HC280D,652
( 9337 138 80652 )
Reel 13" Q1/T1 CECCActive74HCT280D74HCT280D,653
( 9337 138 90653 )
Bulk Pack, CECCActive74HCT280D74HCT280D,652
( 9337 138 90652 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC280D74HC280D,65374HC280Dweek 5, 200484.96.621.51E811
74HC280D74HC280D,65274HC280Dweek 5, 200484.96.621.51E811
74HCT280D74HCT280D,65374HCT280Dweek 5, 200484.96.621.51E811
74HCT280D74HCT280D,65274HCT280Dweek 5, 200484.96.621.51E811
Quality and reliability disclaimer

Documentation (6)

File nameTitleTypeDate
74HC_HCT2809-bit odd, even parity generator, checkerData sheet2017-03-16
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SOT108-1plastic, small outline package; 14 leads; 1.27 mm pitch; 8.65 mm x 3.9 mm x 1.75 mm bodyPackage information2021-01-06


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