5

UCC5639

UNITRODE CORPORATION

7 CONTINENTAL BLVD. • MERRIMACK, NH 03054

TEL. (603) 424-2410 • FAX (603) 424-3460

REG

TRMPWR

DISCNCT

TRMPWR

DIFFB

REG

DIFFB

Termpower

Termpower

4.7

µF

.

0.1

µF

.

4.7

µF

0.1

µF

.

3

36

35

10

34

35

34

10

3

DISCNCT

36

DIFSENS

DIFSENS

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

.

20k

220k

20k

SCSI CONTROLLER

DIFFSENS

4.7

µF

CONTROL LINES (9)

L1+

L1–

L9+

L9–

L1+

L1–

L9+

L9–

4 BITS OF THE HIGH BYTE

L10+

L10–

L13+

L13–

L10+

L10–

L13+

L13–

HIGH BYTE 4 BITS

PLUS PARITY

L1+

L1–

L5+

L5–

L1+

L1–

L5+

L5–

LOW BYTE 8+ PARITY

L6+

L6–

L14+

L14–

L6+

L6–

L14+

L14–

DIFF SENSE

TYPICAL APPLICATION

Note: A 220k resistor is added to ground to insure the transceivers will come up in single-ended mode when no terminator is en-

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

UDG-98111