SN74BCT979

9BIT REGISTERED BTL TRANSCEIVER

WITH PARITY GENERATOR/CHECKER

SCBS115A − OCTOBER 1990 − REVISED NOVEMBER 1993

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

MIN

MAX

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

TYP

MAX

MIN

MAX

UNIT

tPLH

AI

B

1.3

6.8

8.6

1.3

10.4

ns

tPHL

AI

B

2.1

7.8

9.8

2.1

11.8

ns

tPLH

AI

BPAR

3.7

11.6

13.9

3.7

17.6

ns

tPHL

AI

BPAR

5.4

13.9

15.7

5.4

19.2

ns

tPLH

B

AO

2.8

9

11.1

2.8

14.3

ns

tPHL

B

AO

2.4

8.1

10

2.4

12.3

ns

tPLH

B

APARO

4.5

14.1

16.1

4.5

20.9

ns

tPHL

B

APARO

4.2

13.3

15.9

4.2

20.5

ns

tPLH

APARI

BPAR

1.6

6

7.7

1.6

9.3

ns

tPHL

APARI

BPAR

3.4

9.5

11.2

3.4

13.6

ns

tPLH

BPAR

APARO

2.7

7.9

9.9

2.7

12.8

ns

tPHL

BPAR

APARO

3

8.1

10

3

12.5

ns

tPLH

AI

ERRA

3

10.9

13

3

16.1

ns

tPLH

APARI

ERRA

2.8

8.2

10.2

2.8

12.6

ns

tPHL

AI

ERRA

4.2

11.8

14

4.2

16.7

ns

tPHL

APARI

ERRA

4

8.9

10.9

4

12.8

ns

tPLH

B

ERRB

4.3

13.4

15.9

4.3

20.6

ns

tPLH

BPAR

ERRB

4.2

10.8

13.1

4.2

16.6

ns

tPHL

B

ERRB

5.5

14.5

17

5.5

21.5

ns

tPHL

BPAR

ERRB

5.5

11.3

13.5

5.5

16.5

ns

tPLH

ODD/EVEN

ERRA

3.4

9.1

10.9

3.4

13.7

ns

tPHL

ODD/EVEN

ERRA

4.4

10.3

12.2

4.4

14.5

ns

tPLH

ODD/EVEN

ERRB

3.4

8.7

10.7

3.4

13.3

ns

tPHL

ODD/EVEN

ERRB

4.6

10

11.9

4.6

14.2

ns

tPLH

ODD/EVEN

APARO

3.4

8.7

10.6

3.4

13.5

ns

tPHL

ODD/EVEN

APARO

3.1

9

10.9

3.1

13.4

ns

tPLH

ODD/EVEN

BPAR

4

10.3

12.1

4

15.8

ns

tPHL

ODD/EVEN

BPAR

4.9

12.3

14.1

4.9

17.3

ns

tPLH

SEL

APARO

0.7

5.3

6.9

0.7

8.4

ns

tPHL

SEL

APARO

1.1

5

6.5

1.1

7.8

ns

tPLH

SEL

BPAR

1.1

6.4

8.1

1.1

10.1

ns

tPHL

SEL

BPAR

2.8

8.3

9.9

2.8

12.6

ns

NOTE 3: Load circuits and voltage waveforms are shown in Section 1.