SN55LBC976

9-CHANNEL DIFFERENTIAL TRANSCEIVER

SGLS091A – JUNE 1995 – REVISED JANUARY 1997

17

POST OFFICE BOX 655303

APPLICATION INFORMATION

nB –

nB +

nA

nDE/RE

–

+

EN

I/O

560

Ω†

nB –

nB +

nA

nDE/RE

–

+

EN

I/O

nB –

nB +

nA

nDE/RE

–

+

560

Ω

SCSI

Connector

SCSI

Connector

SCSI

Connector

I

O

nB –

nB +

nA

nDE/RE

–

+

EN

O‡

560

Ω

nB –

nB +

nA

nDE/RE

–

+

EN

O‡

560

Ω

nB –

nB+

nA

nDE/RE

–

+

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

VCC

VCC

VCC

VCC

VCC

VCC

560

Ω†

560

Ω†

560

Ω†

† When this resistor is 0

Ω, the circuit is open drain.

‡ Must be open-drain or 3-state output

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

Figure 20. Typical SCSI Transceiver Connections