74HC02DB datasheet(6/15 Pages) NXP

6 / 15 page

74HC_HCT02_3

Product data sheet

Rev. 03 — 18 September 2008

6 of 15

NXP Semiconductors

74HC02; 74HCT02

Quad 2-input NOR gate

[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 × VCC2 × fi × N+ ∑ (CL × VCC2 × 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;

∑ (C

L × VCC

× f

o) = sum of outputs.

11. Waveforms

74HCT02

tpd

propagation delay

nA, nB to nY; see Figure 6

[1]

VCC = 4.5 V

VCC = 5.0 V; CL =15pF

transition time

VCC = 4.5 V; see Figure 6

[2]

CPD

power dissipation

capacitance

per package;

VI = GND to VCC − 1.5 V

[3]

-24-

Table 7.

Dynamic characteristics

GND=0V; CL =50pF; for load circuit see Figure 7.

Symbol Parameter

Conditions

°C

−40 °C to +125 °C Unit

Min

Typ

Max

(85

°C)

Max

(125

°C)

Measurement points are given in Table 9.

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

Fig 6.

Input to output propagation delays

001aai814

nA, nB input

GND

VOH

VOL

nY output

tTHL

tTLH

tPHL

tPLH

Table 8.

Measurement points

Type

Input

Output

74HC02

0.5VCC

0.1VCC

0.9VCC

74HCT02

1.3 V

0.1VCC

0.9VCC

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