HD74HC148 datasheet(4/8 Pages) HITACHI

Part #	HD74HC148

Description	8-to-3-line Octal Priority Encoder

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Manufacturer	HITACHI [Hitachi Semiconductor]

Direct Link	http://www.renesas.com/eng

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4 / 8 page

HD74HC148

4

AC Characteristics (C

L = 50 pF, Input tr = tf = 6 ns)

Ta = 25

°C

Ta = –40 to

+85

°C

Item

Symbol

V

CC (V)

Min Typ Max Min

Max

Unit

Test Conditions

Propagation delay t

PLH

2.0

—

230 —

290

ns

0 - 7 to A

0 - A2

time

t

PHL

4.5

—

15

46

—

58

6.0

—

39

—

49

t

PLH

2.0

—

250 —

315

ns

0 - 7 to EO

t

PHL

4.5

—

16

50

—

63

6.0

—

43

—

54

t

PLH

2.0

—

270 —

340

ns

0 - 7 to GS

t

PHL

4.5

—

18

54

—

68

6.0

—

46

—

58

t

PLH

2.0

—

230 —

290

ns

EI to A

0 - A2

t

PHL

4.5

—

12

46

—

58

6.0

—

39

—

49

t

PLH

2.0

—

250 —

315

ns

EI to GS

t

PHL

4.5

—

12

50

—

63

6.0

—

43

—

54

t

PLH

2.0

—

270 —

340

ns

EI to EO

t

PHL

4.5

—

12

54

—

68

6.0

—

46

—

58

Output rise/fall

t

TLH

2.0

—

75

—

90

ns

time

t

THL

4.5

—

5

15

—

19

6.0

—

13

—

16

Input capacitance

Cin

—

5

10

—

10

pF

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