SN54HC646, SN74HC646

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCLS150B – DECEMBER 1982 – REVISED MAY 1997

8

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

90

265

400

330

CLKBA or CLKAB

A or B

4.5 V

24

53

80

66

6 V

20

46

68

57

2 V

70

220

335

280

tpd

A or B

B or A

4.5 V

20

44

67

56

ns

6 V

15

38

57

49

†

2 V

80

275

415

345

SBA or SAB†

A or B

4.5 V

24

55

83

69

6 V

20

47

70

60

2 V

113

330

500

410

OE

A or B

4.5 V

33

66

100

82

t

6 V

27

57

85

71

ns

ten

2 V

113

330

500

410

ns

DIR

A or B

4.5 V

33

66

100

82

6 V

27

57

85

71

2 V

45

210

315

265

tt

Any

4.5 V

17

42

63

53

ns

6 V

13

36

53

43

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

PARAMETER

TEST CONDITIONS

TYP

UNIT

Cpd

Power dissipation capacitance

No load

50

pF

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.