SN54HC646, SN74HC646

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCLS150B – DECEMBER 1982 – REVISED MAY 1997

7

POST OFFICE BOX 655303

(unless otherwise noted) (see Figure 2)

PARAMETER

FROM

TO

VCC

TA = 25°C

SN54HC646

SN74HC646

UNIT

PARAMETER

(INPUT)

(OUTPUT)

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

2 V

6

11

4.4

5.5

fmax

4.5 V

31

54

22

27

MHz

6 V

36

64

25

31

2 V

65

180

270

225

CLKBA or CLKAB

A or B

4.5 V

18

36

54

45

6 V

14

31

46

38

2 V

50

135

205

170

tpd

A or B

B or A

4.5 V

14

27

41

34

ns

6 V

11

23

35

29

†

2 V

70

190

285

240

SBA or SAB†

A or B

4.5 V

20

38

57

48

6 V

16

32

48

41

2 V

85

245

370

305

ten

OE

A or B

4.5 V

25

49

74

61

ns

6 V

20

42

63

52

2 V

85

245

370

305

tdis

OE

A or B

4.5 V

25

49

74

61

ns

6 V

20

42

63

52

2 V

80

245

370

305

ten

DIR

A or B

4.5 V

25

49

74

61

ns

6 V

20

42

63

52

2 V

80

245

370

305

tdis

DIR

A or B

4.5 V

25

49

74

61

ns

6 V

20

42

63

52

2 V

28

60

90

75

tt

Any

4.5 V

8

12

18

15

ns

6 V

6

10

15

13

† These parameters are measured with the internal output state of the storage register opposite that of the bus input.

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.