M74HC646M1R datasheet(7/12 Pages) STMICROELECTRONICS

Part #	M74HC646M1R

Description	HC648 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE, INV. HC646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE

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AC ELECTRICAL CHARACTERISTICS (CL =50 pF, Input tr =tf =6 ns)

Symbol

Parameter

Test Conditions

Value

Unit

VCC

(V)

CL

(pF)

TA =25

oC

-40 to 85

oC

Min.

Typ.

Max.

Min.

Max.

tPLH

tPHL

Propagation Delay Time

(SELECT - BUS)

2.0

50

81

170

215

ns

4.5

23

34

43

6.0

20

29

37

2.0

150

98

210

265

ns

4.5

28

42

53

6.0

24

36

45

tPZL

tPZH

3-State Output Enable Time

(G, DIR)

2.0

50

RL =1 K

Ω

84

175

220

ns

4.5

24

35

44

6.0

20

30

37

2.0

150

RL =1 K

Ω

102

215

270

ns

4.5

29

43

54

6.0

25

37

46

tPLZ

tPHZ

Output Disable Time

(G, DIR)

2.0

50

RL =1 K

Ω

60

175

220

ns

4.5

23

35

44

6.0

20

30

37

fMAX

Maximum Clock Frequency

2.0

50

6

19

4.8

MHz

4.5

30

67

24

6.0

35

79

28

tW(H)

tW(L)

Minimum Clock Pulse Width

2.0

50

30

75

95

ns

4.5

7

15

19

6.0

6

13

16

ts

Minimum Set-up Time

2.0

50

16

50

65

ns

4.5

4

10

13

6.0

3

9

11

th

Minimum Hold Time

2.0

50

55

ns

4.5

5

6.0

5

CIN

Input Capacitance

5

10

pF

CI/O

Bus Terminal Capacitance

10

pF

CPD (*)

Power Dissipation Capacitance

for HC646

for HC648

39

38

pF

(*) 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 Test Circuit). Average operting current can be obtained by the following equation. ICC(opr) = CPD

•VCC •fIN +ICC/8 (per bit)

M74HC646/648

7/12

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