SN54HC646, SN74HC646

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCLS150C – DECEMBER 1982 – REVISED MARCH 2003

6

POST OFFICE BOX 655303

timing requirements over recommended operating free-air temperature range (unless otherwise

noted)

VCC

TA = 25°C

SN54HC646

SN74HC646

UNIT

VCC

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

2 V

6

4.3

5.5

fclock

Clock frequency

4.5 V

31

22

27

MHz

6 V

36

25

31

2 V

80

115

95

tw

Pulse duration, CLKBA or CLKAB high or low

4.5 V

16

23

19

ns

6 V

14

20

16

↑

↑

2 V

100

150

125

tsu

Setup time, A before CLKAB

↑ or B before CLKBA↑

4.5 V

20

30

25

ns

6 V

17

26

21

↑

↑

2 V

5

5

5

th

Hold time, A after CLKAB

↑ or B after CLKBA↑

4.5 V

5

5

5

ns

6 V

5

5

5

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.