HCT Input Loading Table

4.4 Electrical Characteristics

INPUT

UNIT LOADS(1)

I 1 , I 2 , I 3 , I 6 , I 7

1.1

I 4 , I 5 , I 8 , I 9

1.5

(1)

Unit Load is ∆ICC limit specified in DC Electrical Table, e.g.,

360µA max at 25oC.

4.5 Switching Characteristics

Input tt = 6ns. Unless otherwise specified, CL = 50pF

PARAMETER

TEST

CONDITIONS

VCC (V)

25°C

-40°C to 85°C

-55°C to 125°C

UNIT

MIN

TYP

MAX

MIN

MAX

MIN

MAX

HC TYPES

tPLH,

tPHL

Propagation delay,

input to output

CL = 50pF

2

160

200

240

ns

4.5

32

40

48

5

13

6

27

34

41

tTLH, tTHL Transition times

CL = 50pF

2

75

95

110

ns

4.5

15

19

22

6

13

16

19

CIN

Input capacitance

10

10

10

pF

CPD

Power dissipation

capacitance(1) (2)

5

32

pF

HCT TYPES

tPLH,

tPHL

Propagation delay,

input to output

CL = 50pF

4.5

35

44

53

ns

5

14

ns

tTLH, tTHL Transition times

CL = 50pF

4.5

15

19

22

ns

CIN

Input capacitance

10

10

10

pF

CPD

Power dissipation

capacitance(1) (2)

5

42

pF

(1)

CPD is used to determine the dynamic power consumption, per gate.

(2)

PD = VCC 2 fi (CPD + CL) where fi = Input Frequency, CL = Output Load Capacitance, VCC = Supply Voltage.

CD54HC147, CD74HC147, CD74HCT147

SCHS149G – NOVEMBER 1998 – REVISED JANUARY 2025

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