74HC21

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© NXP Semiconductors N.V. 2015. All rights reserved.

Product data sheet

Rev. 7 — 30 November 2015

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 W):

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

2

 f

o) = sum of outputs.

Table 7.

Dynamic characteristics

GND = 0 V; test circuit see Figure 8.

Symbol Parameter

Conditions

25

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

-

33

110

-

140

-

165

ns

VCC = 4.5 V

-

12

22

-

28

-

33

ns

VCC = 6.0 V

-

10

19

-

24

-

28

ns

VCC =5.0 V; CL = 15 pF

-

10

-

----

ns

tt

transition time

nY output; see Figure 7

[2]

VCC = 2.0 V

-

19

75

-

95

-

110

ns

VCC = 4.5 V

-

7

15

-

19

-

22

ns

VCC = 6.0 V

-

6

13

-

16

-

19

ns

CPD

power

dissipation

capacitance

VI = GND to VCC

[3]

-

15

-

----

pF

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