UCC5629

SLUS444A – NOVEMBER 1999 – REVISED MARCH 2003

6

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TYPICAL APPLICATION DIAGRAM

UDG–99157

REG

TRMPWR

DISCNCT

TRMPWR

DIFFB

REG

DIFFB

TRMPWR

TRMPWR

4.7

µF

4.7

µF

4.7

µF

4.7

µF

3

36

35

10

34

35

34

10

3

DISCNCT 36

DIFFSENS

DIFFSENS

REG

TRMPWR

DISCNCT

DIFFB

4.7

µF

3

36

10

34

DATA LINES (15)

TRMPWR

REG

DIFFB

4.7

µF

34

10

DATA LINES (15)

3

DISCNCT 36

4.7

µF

50 k

Ω

220 k

Ω

50 k

Ω

SCSI CONTROLLER

DIFFSENS

4.7

µF

CONTROL LINES

9 BITS

L1+

L1–

L9+

L9–

L1+

L1–

L9+

L9–

4 BITS OF THE HIGH BYTE

L10+

L10–

L13+

L13–

L10+

L10–

L13+

L13–

L1+

L1–

L9+

L9–

L1+

L1–

L9+

L9–

LOW BYTE 8 BITS

PLUS PARITY

L10+

L10–

L14+

L14–

L10+

L10–

L14+

L14–

HIGH BYTE 4 BITS

PLUS PARITY

35

35 NC

NC

GND

25

GND

25

25

GND

25

GND

NOTES:

1.

A 220-k

Ω resistor is added to ground to insure the transceivers will come up in single-ended mode when no terminator is enabled.

The controller DIFFSENS ties to the DIFFB pin on the terminators, only one RC network should be on a device.

2. SPI–2 uses a 20-k

Ω resistor between DIFFSENS and DIFFB with a 0.1-µF capacitor to ground. SPI–3 and SPI–4 uses a 50-kΩ

resistor with a 4.7-

µF capacitor.