CD54HC646, CD74HCT646

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCHS278B – APRIL 2003 – REVISED APRIL 2003

8

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

switching characteristics for CD54HC646 over recommended operating free-air temperature range

(unless otherwise noted) (see Figure 2)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

LOAD

CAPACITANCE

VCC

TA = 25°C

TA = –55°C

TO 125

°C

TA = –40°C

TO 85

°C

UNIT

(INPUT)

(OUTPUT)

CAPACITANCE

CC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

2 V

6

4

5

f

CL = 50 pF

4.5 V

30

20

25

MHz

fmax

6 V

35

23

29

MHz

CL = 15 pF

5 V

60

2 V

220

330

275

CLKBA or

AorB

CL = 50 pF

4.5 V

44

66

55

CLKAB

A or B

6 V

37

56

47

CL = 15 pF

5 V

18

2 V

135

205

170

t d

AorB

BorA

CL = 50 pF

4.5 V

27

41

34

ns

tpd

A or B

B or A

6 V

23

35

29

ns

CL = 15 pF

5 V

12

2 V

170

255

215

SBA or

AorB

CL = 50 pF

4.5 V

34

51

43

SAB†

A or B

6 V

29

43

37

CL = 15 pF

5 V

14

2 V

175

265

220

t

OE

AorB

CL = 50 pF

4.5 V

35

53

44

ns

ten

OE

A or B

6 V

30

45

37

ns

CL = 15 pF

5 V

14

2 V

175

265

220

tdi

OE

AorB

CL = 50 pF

4.5 V

35

53

44

ns

tdis

OE

A or B

6 V

30

45

37

ns

CL = 15 pF

5 V

14

2 V

60

90

75

tt

Any

CL = 50 pF

4.5 V

12

18

15

ns

6 V

10

15

13

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