74HC08DB datasheet(6/15 Pages) LEIDITECH

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10 Dynamic characteristics

Table 7. Dynamic characteristics

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

25 °C

-40 °C to +125 °C

Symbol Parameter

Conditions

Min

Typ

Max

(85 °C)

Max

(125 °C)

Unit

74HC08

nA, nB to nY; see Figure 6

[1]

VCC = 2.0 V

115

135

VCC = 4.5 V

VCC = 5.0 V; CL = 15 pF

tpd

propagation delay

VCC = 6.0 V

see Figure 6

[2]

VCC = 2.0 V

110

VCC = 4.5 V

transition time

VCC = 6.0 V

CPD

power dissipation

capacitance

per package; VI = GND to VCC

[3]

74HCT08

nA, nB to nY; see Figure 6

[1]

VCC = 4.5 V

tpd

propagation delay

VCC = 5.0 V; CL = 15 pF

transition time

VCC = 4.5 V; see Figure 6

[2]

CPD

power dissipation

capacitance

per package;

VI = GND to VCC - 1.5 V

[3]

[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;

∑ (CL × VCC2 × fo) = sum of outputs.

74HC08; 74HCT08

Rev :

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01.06.2015

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