SN75LBC970A

SCSI DIFFERENTIAL CONVERTER-CONTROL

SLLS215B – MAY 1995 – REVISED JANUARY 1999

8

POST OFFICE BOX 655303

switching characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

AATN –

AC/D –

BATN

±

BC/D

±

See Figure 3

76

26 6

td1 td2

Delay time, A to B,

high- to low-level or

AI/O –

AMSG –

BI/O

±

BMSG

±

See Figure 3

7.6

26.6

ns

td1, td2

high- to low-level or

low- to high-level output

AACK

BACK

±

8.5

25.3

ns

g

AACK –

AREQ –

BACK

±

BREQ

±

VCC = 5 V, TA = 25°C

10

18

AREQ –

BREQ

±

VCC = 5 V, TA = 70°C

12.5

20.5

tsk(lim)

Skew limit

AACK –

BACK

±

See Note 4

8

ns

tsk(p)

Pulse skew

AREQ –

BREQ

±

See Note 5

6

ns

td3 td4

Delay time, B to A,

high- to low-level or

BATN

±

BC/D

±

BI/O

±

BMSG

±

AATN –

AC/D –

AI/O –

AMSG –

See Figure 4

21.5

36.2

ns

td3, td4

high- to low-level or

low- to high-level output

BACK

±

AACK

21.5

36.2

ns

g

BACK

±

BREQ

±

AACK –

AREQ –

VCC = 5 V, TA = 25°C

23.6

32.6

BREQ

±

AREQ –

VCC = 5 V, TA = 70°C

24.4

33.4

tsk(lim)

Skew limit

BACK

±

AACK –

See Note 4

9

ns

tsk(p)

Pulse skew

BREQ

±

AREQ –

See Note 5

6

ns

tPHL

Delay time, high- to low-level

TIMEOUT

DRVBUS

See Figure 5

200

ns

tPLH

Delay time, low- to high-level

TIMEOUT

DRVBUS

See Figure 5

200

ns

ABSY –

BBSY

±

200

tdis

Disable time

ARST –

BRST

±

See Figure 6

200

ns

ASEL –

BSEL

±

200

ABSY –

BBSY

±

40

ten

Enable time

ARST –

BRST

±

See Figure 6

55

ns

ASEL –

BSEL

±

39

tdis1

Disable time

BRST

±

ARST –

93

ns

tdis2

Disable time

BSEL

±

ASEL –

55

ns

tdis3

Disable time

BBSY

±

ABSY –

60

ns

ten1

Enable time

BRST

±

ARST –

See Figure 7

63

ns

ten2

Enable time

BSEL

±

ASEL –

45

ns

ten3

Enable time

BBSY

±

ABSY –

45

ns

ten4

Enable time

BSEL

±

ASEL –

92

ns

† All typical values are at VCC = 5 V, TA = 25 °C.

NOTES:

4. This parameter is applicable at one VCC and operating temperature within the recommended operating conditions and to any two

devices.

5. Pulse skew is the difference between the high-to-low and low-to-high propagation delay times of any single channel.