CD74HCT4543

BCD-TO-7 SEGMENT LATCH/DECODER/DRIVER

SCHS281A – REVISED MAY 2003

5

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

HCT INPUT LOADING TABLE

INPUT

UNIT LOADS†

D0, D1, D2

1

D3, BI

0.5

PH

1.25

LD

1.5

† Unit Load is

∆ICC limit specified in electrical

characteristics table, e.g., 360

µA maximum

at 25

°C.

timing requirements over recommended operating free-air temperature range VCC = 4.5 V (unless

otherwise noted) (see Figure 1)

TA = 25°C

TA = –55°C

TO 125

°C

TA = –40°C

TO 85

°C

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

tw

Pulse duration, LD high

10

15

13

ns

tsu

Setup time, BCD inputs before LD

↓

12

18

15

ns

th

Hold time, BCD inputs before LD

↓

8

12

10

ns

switching characteristics over recommended operating free-air temperature range (unless

otherwise noted) (see Figure 2)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

LOAD

CAPACITANCE

VCC

TA = 25°C

TA = –55°C

TO 125

°C

TA = –40°C

TO 85

°C

UNIT

(INPUT)

(OUTPUT)

CAPACITANCE

CC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

D

Output

CL = 50 pF

4.5 V

80

120

100

Dn

Output

CL = 15 pF

5 V

33

LD

Output

CL = 50 pF

4.5 V

77

116

96

t d

LD

Output

CL = 15 pF

5 V

32

ns

tpd

BI

Output

CL = 50 pF

4.5 V

66

99

83

ns

BI

Output

CL = 15 pF

5 V

27

PH

Output

CL = 50 pF

4.5 V

66

99

83

PH

Output

CL = 15 pF

5 V

27

tt

Any

CL = 50 pF

4.5 V

50

75

63

ns

operating characteristics, VCC = 5 V, TA = 25°C

PARAMETER

TYP

UNIT

Cpd‡

Power dissipation capacitance

54

pF

‡ Cpd is used to determine the dynamic power consumption, per package.

PD = Cpd VCC2 fi + ∑ CL VCC2 fo

where: fi = input frequency

fo = output frequency

CL = output load capacitance

VCC = supply voltage