SN54BCT648, SN74BCT648

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3STATE OUTPUTS

SCBS050B − MAY 1990 − REVISED APRIL 1994

7

POST OFFICE BOX 655303

POST OFFICE BOX 1443

switching characteristics over recommended ranges of supply voltage and operating free-air

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 5 V,

TA = 25°C

SN54BCT648

SN74BCT648

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

fmax

67

110

67

67

MHz

tPLH

CLKBA or CLKAB

A or B

3.7

7.4

10.3

3.7

13.4

3.7

12.1

ns

tPHL

CLKBA or CLKAB

A or B

4.3

7.8

10.6

4.3

13.2

4.3

12.5

ns

tPLH

A or B

B or A

3.8

7.4

9.9

3.8

12.8

3.8

12.2

ns

tPHL

A or B

B or A

3.3

6.5

8.9

3.3

11.2

3.3

10.1

ns

tPLH

SAB or SBA†

A or B

3.3

6.2

8.4

3.3

10.7

3.3

9.7

ns

tPHL

SAB or SBA†

(with A or B high)

A or B

5.3

9.6

12.6

5.3

16.5

5.3

15.5

ns

tPLH

SBA or SAB†

A or B

4.6

8.8

11.7

4.6

16.5

4.6

14.3

ns

tPHL

SBA or SAB†

(with A or B low)

A or B

4.9

8.4

11.1

4.9

13.8

4.9

13

ns

tPZH

OE

A or B

4.5

8.4

11

4.5

14.4

4.5

13.5

ns

tPZL

OE

A or B

4.9

9.2

12.2

4.9

16

4.9

15

ns

tPHZ

OE

A or B

4

7.3

9.7

4

12

4

11.2

ns

tPLZ

OE

A or B

3.5

6.6

9.3

3.5

11.6

3.5

10.5

ns

tPZH

DIR

A or B

3.1

7.4

11

3.1

14.1

3.1

13.4

ns

tPZL

DIR

A or B

3.8

8.3

12.2

3.8

15.5

3.8

14.7

ns

tPHZ

DIR

A or B

4.3

8.3

11.6

3.5

14.3

4.3

13.9

ns

tPLZ

DIR

A or B

2.7

6.7

9.9

2.7

12.8

2.7

11.9

ns

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

NOTE 2: Load circuits and voltage waveforms are shown in Section 1.