HD74HC640, HD74HC643

Rev.2.00 Mar 30, 2006 page 5 of 10

Ta = 25

°C

Ta = –40 to +85

°C

Item

Min

Typ

Max

Min

Max

Unit

Test Conditions

2.0

—

—

90

—

115

4.5

—

12

18

—

23

6.0

—

—

15

—

20

ns

2.0

—

—

90

—

115

4.5

—

12

18

—

23

Propagation delay

time

6.0

—

—

15

—

20

ns

2.0

—

—

230

—

290

4.5

—

15

46

—

58

6.0

—

—

39

—

49

ns

2.0

—

—

230

—

290

4.5

—

15

46

—

58

Output enable

time

6.0

—

—

39

—

49

ns

2.0

—

—

215

—

270

4.5

—

17

43

—

54

6.0

—

—

37

—

46

ns

2.0

—

—

215

—

270

4.5

—

17

43

—

54

Output disable

time

6.0

—

—

37

—

46

ns

2.0

—

—

60

—

75

4.5

—

4

12

—

15

Output rise/fall

time

6.0

—

—

10

—

13

ns

Input capacitance

Cin

—

—

5

10

—

10

pF

Test Circuit

HD74HC640

A1

OPEN

GND

C =

50 pF

G

DIR

B1

S1

1 k

Ω

S2

L

Ω

TEST

S2

t

/ t

PLH

PHL

OPEN

GND

t

/ t

ZH

HZ

t

/ t

ZL

LZ

Ω

2. A2–B2, A3–B3, A4–B4, A5–B5, A6–B6, A7–B7, A8–B8 are identical to above load circuit.

3. S1 is a input / output swich.

Output

Input

Pulse Generator

Input

Pulse Generator