SN75971B

SCSI DIFFERENTIAL CONVERTER-DATA

SLLS322A – NOVEMBER 1999 – REVISED JANUARY 2000

9

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

50%

VOD(H)

~ – 0.925 V

VOD(L)

ten td

td tdis

3 V

1.5 V

0 V

Input

Output

0.5 V

t0

t0

or

NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR

≤ 1 MHz, 45% < duty cycle < 50%, tr ≤ 1 ns,

tf ≤ 1 ns, ZO =50 Ω.

B. CL includes probe and jig capacitance.

C. Resistance values are in ohms with a tolerance of

± 5%.

D. All input voltage levels are held to within 0.01 V.

IO

IO

VOD

VO

VO

B+

B–

A

II

15 pF

15 pF

75

Ω

165

Ω

375

Ω

375

Ω

S1

S2

165

Ω

AB

VI

Input

(see Note A)

GND

5 V

Figure 3. A to B Propagation Delay Time Test Circuit

td1

td2

ten1

tdis1

SDB

DSENS

RESET

ADBn –

DRVBUS

BDBn –

BDBn +

VOD

Figure 4. A to B Timing Waveforms