74HC21 datasheet(5/14 Pages) NXP

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74HC21_5

Product data sheet

Rev. 05 — 7 May 2009

5 of 14

NXP Semiconductors

74HC21

Dual 4-input AND gate

10. Dynamic characteristics

[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.

Table 7.

Dynamic characteristics

GND = 0 V; test circuit see Figure 8.

Symbol Parameter

Conditions

°C

−40 °C to +85 °C −40 °C to +125 °C Unit

Min

Typ

Max

Min

Max

Min

Max

tpd

propagation

delay

nA, nB, nC or nD to nY;

see Figure 7

[1]

VCC = 2.0 V

110

140

165

VCC = 4.5 V

VCC = 6.0 V

VCC = 5.0 V; CL = 15 pF

----

transition time

nY output; see Figure 7

[2]

VCC = 2.0 V

110

VCC = 4.5 V

VCC = 6.0 V

CPD

power

dissipation

capacitance

VI = GND to VCC

[3]

----

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