SN75LBC976

9CHANNEL DIFFERENTIAL TRANSCEIVER

SLLS133D − AUGUST 1992 − REVISED MAY 1995

2−17

POST OFFICE BOX 655303

POST OFFICE BOX 1443

APPLICATION INFORMATION

nB −

nB +

nA

nDE/RE

−

+

EN

I/O

560

Ω†

−

+

EN

I/O

−

+

SCSI

Connector

SCSI

Connector

SCSI

Connector

I

O

−

+

EN

O‡

−

+

EN

O‡

−

+

560

Ω

SCSI

Connector

SCSI

Connector

SCSI

Connector

I

O

I

I

(a) ACTIVE-HIGH BIDIRECTIONAL I/O

WITH SEPARATE ENABLE

(b) ACTIVE-LOW BIDIRECTIONAL I/O

WITH SEPARATE ENABLE

(c) WIRED-OR DRIVER AND ACTIVE-HIGH INPUT

(d) SEPARATE ACTIVE-HIGH INPUT, OUTPUT,

AND ENABLE

(e) SEPARATE ACTIVE-LOW INPUT AND

OUTPUT AND ACTIVE-HIGH ENABLE

(f) WIRED-OR DRIVER AND ACTIVE-LOW INPUT

VCC

560

Ω†

VCC

nA

nDE/RE

nB −

nB +

560

Ω†

VCC

nA

nDE/RE

nB −

nB +

560

Ω†

VCC

nA

nDE/RE

nB −

nB +

560

Ω†

VCC

560

Ω†

VCC

nA

nDE/RE

nB −

nB +

560

Ω†

VCC

nA

nDE/RE

nB −

nB +

† If 0, is open drain

‡ Must be open-drain or 3-state output

NOTE: The BSR, CRE, A, and DE/RE inputs have internal pullups. CDE0, CDE1, and CDE2 have internal pulldowns.

Figure 20. Typical SCSI Transceiver Connections