DocID1973 Rev 2

7/12

M74HC42

Absolute maximum ratings and operating conditions

Figure 4. Test circuit

1. CL = 50 pF or equivalent (includes jig and probe capacitance). RT = ZOUT of pulse generator (typically 50 ).

Table 7. AC electrical characteristics (CL = 50 pF, input tr = tf = 6 ns)

Symbol

Parameter

Test condition

Value

Unit

VCC (V)

TA = 25 °C

-40 to 85 °C

-55 to 125 °C

Min.

Typ. Max. Min. Max.

Min.

Max.

tTLH

tTHL

Output transition time

2.0

30

75

95

110

ns

4.5

8

15

19

22

6.0

7

13

16

19

tPLH

tPHL

Propagation delay time

2.0

64

130

165

195

ns

4.5

16

26

33

39

6.0

14

22

28

33

Table 8. Capacitive characteristics

Symbol

Parameter

Test condition

Value

Unit

VCC (V)

TA = 25 °C

-40 to 85 °C

-55 to 125 °C

Min.

Typ. Max. Min. Max.

Min.

Max.

CIN

Input capacitance

5.0

5

10

10

10

pF

CPD

Power dissipation

capacitance(1)

5.0

60

pF

1. CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current

consumption without load (refer to Figure 4). The average operating current can be obtained by the following equation:

ICC(opr) = CPD x VCC x fIN + ICC.

Obsolete

Product(s)

- Obsolete

Product(s)