54ACT16646, 74ACT16646

16-BIT BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCAS127B – MARCH 1990 – REVISED APRIL 1996

8

POST OFFICE BOX 655303

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

temperature, (unless otherwise noted) (see Figure 2)

PARAMETER

FROM

TO

TA = 25°C

54ACT16646

74ACT16646

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

fmax

90

90

90

MHz

tPLH

AorB

BorA

3.9

7.5

9.4

3.9

11.5

3.9

10.6

ns

tPHL

A or B

B or A

3.4

7.6

10.6

3.4

12.2

3.4

11.4

ns

tPZH

OE

AorB

3.2

7.7

10.8

3.2

12.9

3.2

11.9

ns

tPZL

OE

A or B

4.2

9

12.2

4.2

14.6

4.2

13.5

ns

tPHZ

OE

AorB

5.3

7.7

9.6

5.3

10.4

5.3

10.2

ns

tPLZL

OE

A or B

4.9

7.3

9.2

4.9

10.3

4.9

9.9

ns

tPLH

CLKBA or CLKAB

AorB

4.9

8.9

11.1

4.9

13.1

4.9

12.2

ns

tPHL

CLKBA or CLKAB

A or B

5.1

9

11

5.1

13.1

5.1

12.3

ns

tPLH

SAB or SBA{

AorB

5.2

10.3

13.8

5.2

17.2

5.2

15.6

ns

tPHL

SAB or SBA

(with A or B high)

A or B

4.9

8.2

10.6

4.9

12.5

4.9

11.7

ns

tPLH

SBA or SAB{

AorB

4.3

7.8

9.9

4.3

12.1

4.3

11.1

ns

tPHL

SBA or SAB

(with A or B high)

A or B

5.9

11.2

14.9

5.9

18.2

5.9

16.7

ns

tPZH

DIR

AorB

4.5

9.5

13.6

4.5

16.2

4.5

15.2

ns

tPZL

DIR

A or B

4.3

9.2

11.8

4.3

14.2

4.3

13.1

ns

tPHZ

DIR

AorB

4.5

7.9

10.2

4.5

11.2

4.5

10.8

ns

tPLZ

DIR

A or B

4.4

7.5

9.8

4.4

10.8

4.4

10.4

ns

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

PARAMETER

TEST CONDITIONS

TYP

UNIT

C d

Power dissipation capacitance per transceiver

Outputs enabled

CL =50 pF

f=1MHz

58

pF

Cpd

Power dissipation capacitance per transceiver

Outputs disabled

CL = 50 pF,

f = 1 MHz

13

pF

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.