SN54ABT657A, SN74ABT657A

OCTAL TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS

AND 3-STATE OUTPUTS

SCBS192E – JANUARY 1991 – REVISED JUNE 1997

7

POST OFFICE BOX 655303

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

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 5 V,

TA = 25°C

SN54ABT657A

SN74ABT657A

UNIT

(INPUT)

(OUTPUT)

MIN

TYP

MAX

MIN

MAX

MIN

MAX

tPLH

AorB

BorA

1

3.2

4.2

1

5

1

4.6

ns

tPHL

A or B

B or A

1

2.8

3.8

1

4.5

1

4.3

ns

tPLH

A

PARITY

1.8

4.8

6.3

1.8

8.5

1.8

8.1

ns

tPHL

A

PARITY

2.3

4.9

6.4

2.3

8.1

2.3

7.7

ns

tPLH

ODD/EVEN

PARITY ERR

1.1

3.3

4.2

1.1

5.3

1.1

4.9

ns

tPHL

ODD/EVEN

PARITY, ERR

1.3

3.4

4.5

1.3

5.1

1.3

4.9

ns

tPLH

B

ERR

1.6

4.7

6.5

1.6

8.4

1.6

7.9

ns

tPHL

B

ERR

2.1

4.9

6.9

2.1

8

2.1

7.8

ns

tPLH

PARITY

ERR

2

4.8

6.3

2

8.1

2

7.7

ns

tPHL

PARITY

ERR

2.1

4.9

6.7

2.1

8

2.1

7.5

ns

tPZH

OE

A B PARITY

1.4

4

5.4

1.4

6.8

1.4

6.5

ns

tPZL

OE

A, B, PARITY

1.7

4.1

5.8

1.7

6.7

1.7

6.5

ns

tPZH

OE

ERR

1.8

4.1

5.4

1.8

6.9

1.8

6.6

ns

tPZL

OE

ERR

3.3

6.2

7.6

3.3

9.7

3.3

9.2

ns

tPHZ

OE

A, B, PARITY, or

2.4

4.2

5.6

2.4

6.3

2.4

6.2

ns

tPLZ

OE

,,

,

ERR

1.8

4.2

6.2

1.8

8.9

1.8

7.8

ns

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.