SN74BCT651

OCTAL BUS TRANSCEIVER AND REGISTER

WITH 3STATE OUTPUTS

SCBS054A − AUGUST 1990 − REVISED NOVEMBER 1993

2−6

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

MIN

MAX

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

TYP

MAX

MIN

MAX

UNIT

fmax

85

85

MHz

tPLH

CLKBA or CLKAB

A or B

3.2

7

10

3.2

11.7

ns

tPHL

CLKBA or CLKAB

A or B

3.9

7.3

10.2

3.9

11.8

ns

tPLH

A or B

B or A

3.2

7.3

10.4

3.2

12.6

ns

tPHL

A or B

B or A

2.7

5.9

8.5

2.7

9.8

ns

tPLH

SAB or SBA†

A or B

2.8

6

8.6

2.8

9.8

ns

tPHL

SAB or SBA†

(with A or B high)

A or B

4.8

9.4

12.8

4.8

15.5

ns

tPLH

SBA or SAB†

A or B

3.9

8.6

12.1

3.9

14.6

ns

tPHL

SBA or SAB†

(with A or B low)

A or B

4.4

8.1

11.1

4.4

12.8

ns

tPZH

OEBA or OEAB

A or B

3.3

7.1

9.8

3.3

12

ns

tPZL

OEBA or OEAB

A or B

3.8

7.8

10.8

3.8

13.1

ns

tPHZ

OEBA or OEAB

A or B

3.6

6.6

9

3.6

10.2

ns

tPLZ

OEBA or OEAB

A or B

2.8

5.8

8.4

2.8

9.6

ns

tPZH

DIR

A or B

2.2

5.1

7.3

2.2

8.3

ns

tPZL

DIR

A or B

2.8

5.9

8.5

2.8

9.7

ns

tPHZ

DIR

A or B

4.2

8

12.8

4.2

15

ns

tPLZ

DIR

A or B

3.8

7.4

10.2

3.8

12.3

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.