SN75971B

SCSI DIFFERENTIAL CONVERTER-DATA

SLLS322A – NOVEMBER 1999 – REVISED JANUARY 2000

12

POST OFFICE BOX 655303

APPLICATION INFORMATION

SN75970B

DIFFSENS

6

±BSY

±SEL

±RST

8

±I/O

±MSG

±C/D

±REQ

4

±ATN

±ACK

TEST

CLK 40

(see Note A)

– BSY, – SEL, – I/O, – MSG,

– C/D, – REQ, – ATN, – ACK

8

– RST

RSTFLTR

RESET

(from system)

X1/CLK20

X2

Optional

(see Note B)

VCC

0.022

µF

205 k

Ω

SCSI

Controller

2

16

8

2

16

8

±DB(7–0)

±DBP(0)

±DB(15–8)

±DBP(1)

DIFFSENS

DIFFSENS

– DB(7 – 0)

– DBP(0)

RESET

– DB(15 – 8)

– DBP(1)

RESET

SN75971B

DRVBUS

SDB

TIMEOUT

20 k

Ω

0.1

µF

RESET

20 MHz

(see Note A)

BDBn

BDBP

DSENS

ADBn

ADBP–

RESET

SN75971B

BDBn

BDBP

DSENS

ADBn

ADBP–

RESET

DRVBUS

SDB

NOTES: A. When using the 40-MHz clock input, X1 must be connected to VCC.

B. The oscillator cell of the SN75970B is for a series-resonant crystal and requires approximately 10 pF (including fixture

capacitance) from X1 and X2 to ground in order to function.

Figure 8. Typical Application of the SN75970B and SN75971B