Nexperia

74HC280; 74HCT280

9-bit odd/even parity generator/checker

25 °C

-40 °C to +85 °C -40 °C to +125 °C

Symbol Parameter Conditions

Min Typ Max

Min

Max

Min

Max

Unit

74HCT280

In to PE; see Fig. 5

[1]

VCC = 4.5 V

-

21

42

-

53

-

63

ns

VCC = 5.0 V; CL = 15 pF

-

18

-

-

-

-

-

ns

In to PO; see Fig. 5

VCC = 4.5 V

-

26

45

-

56

-

68

ns

tpd

propagation

delay

VCC = 5.0 V; CL = 15 pF

-

22

-

-

-

-

-

ns

see Fig. 5

[2]

tt

transition

time

VCC = 4.5 V

-

7

15

-

19

-

22

ns

CPD

power

dissipation

capacitance

per package;

VI = GND to VCC - 1.5 V

[3]

-

65

-

-

-

-

-

pF

[1] tpd is the same as tPHL and tPLH.

[2] tt is the same as tTHL and tTLH.

[3] CPD is used to determine the dynamic power dissipation (PD in μW):

PD = CPD × VCC 2 × fi × N + ∑(CL × VCC 2 × fo) where:

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

VCC = supply voltage in V;

N = number of inputs switching;

∑(CL × VCC 2 × fo) = sum of outputs.

10.1. Waveforms and test circuit

aaa-024427

In input

VI

GND

VOH

VOL

PE, PO output

tTHL

tTLH

VM

VM

VX

VY

tPHL

tPLH

Measurement points are given in Table 8.

VOL and VOH are typical voltage output levels that occur with the output load.

Fig. 5. Input (In) to output (PE, PO) propagation delays and output transition times

Table 8. Measurement points

Input

Output

Type

VM

VM

VX

VY

74HC280

0.5VCC

0.5VCC

0.1VCC

0.9VCC

74HCT280

1.3 V

1.3 V

0.1VCC

0.9VCC

74HC_HCT280

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© Nexperia B.V. 2021. All rights reserved

Product data sheet

Rev. 4 — 16 August 2021

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