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SS8218

Rev.2.01 6/06/2003

Ultra160 Multi-mode LVD/SE SCSI Terminator

Features

Auto-selectable multi-mode Single-Ended

or LVD Termination

Meets SCSI-1, SCSI-2, SCSI-3 SPI Ultra

(Fast-20), Ultra 2(SPI-2 LVD), Ultra160 (SPI-3

LVD) standards.

Supports active negation

3pF channel capacitance

Thermal protection

Hot-swap compatible

5% tolerance on SE and LVD termination

resistance

28 and 36 pin SSOP package

28 Pin SSOP: Pin Compatible with DS2119

36 Pin SSOP: Pin Compatible with DS2118,

LX5241 and UCC5630

Applications

Server and workstation

High-end PC

Industrial PC

Disk Array (RAID)

SCSI cable

General Description

The SS8218 Multi-mode LVD/SE SCSI terminator pro-

vides a smooth transition to the next generation of

the SCSI Parallel Interface (SPI-3). It automatically

senses the bus, via DIFFSENS, and switches the ter-

mination to either single-ended (SE) or low voltage

differential (LVD) SCSI, dependent on which type of

devices are connected to the bus. If the SS8218 de-

tects a HVD SCSI device, it switches to a high imped-

ance state. For a 16-bit Wide SCSI bus to be opera-

tional, three SS8218 terminators are needed.

The Multi-mode terminator contains all functions re-

quired to terminate and auto detect and switch modes

for SCSI Parallel Interface (SPI) bus architectures. For

the SE termination, one regulator and nine precision

110ohm resistors are used. For the LVD termination,

the SS8218 integrates 18 regulated supplies with nine

precision resistor strings.

Pin Configuration

R1-

R1+

R2-

NC/HS GND

R3+

R3-

R4+

R4-

R5+

R5-

DISCNCT

GND

TPWR

R9-

R9+

R8+

R8-

R7-

R6-

R6+

DIFFB

DIFFSENSE

M/S

28Pin SSOP/TSSOP

VREF

R2+

TPWR

R7+

1

2

3

4

28

27

26

25

5

6

7

8

9

10

11

12

13

14

24

23

22

21

20

19

18

17

16

15

NC/HS GND

NC

NC

R1+

R1-

R2-

HS/GND

HS/GND

R3+

R3-

R4+

R4-

R5+

R5-

DISCNCT

GND

TPWR

HVD

LVD

SE

R9-

R9+

R8-

R8+

HS/GND

HS/GND

HS/GND

R7-

R7+

R6-

R6+

DIFFB

DIFFSENSE

M/S

VREF

R2+

HS/GND

36Pin SSOP

1

2

3

4

28

27

26

25

5

6

7

8

9

10

11

12

13

14

24

23

22

21

20

19

16

17

15

18

33

32

31

30

29

36

35

34

R1-

R1+

R2-

NC/HS GND

R3+

R3-

R4+

R4-

R5+

R5-

DISCNCT

GND

TPWR

R9-

R9+

R8+

R8-

R7-

R6-

R6+

DIFFB

DIFFSENSE

M/S

28Pin SSOP/TSSOP

VREF

R2+

TPWR

R7+

1

2

3

4

28

27

26

25

5

6

7

8

9

10

11

12

13

14

24

23

22

21

20

19

18

17

16

15

NC/HS GND

R1-

R1+

R2-

NC/HS GND

R3+

R3-

R4+

R4-

R5+

R5-

DISCNCT

GND

TPWR

R9-

R9+

R8+

R8-

R7-

R6-

R6+

DIFFB

DIFFSENSE

M/S

28Pin SSOP/TSSOP

VREF

R2+

TPWR

R7+

1

2

3

4

28

27

26

25

5

6

7

8

9

10

11

12

13

14

24

23

22

21

20

19

18

17

16

15

NC/HS GND

NC

NC

R1+

R1-

R2-

HS/GND

HS/GND

R3+

R3-

R4+

R4-

R5+

R5-

DISCNCT

GND

TPWR

HVD

LVD

SE

R9-

R9+

R8-

R8+

HS/GND

HS/GND

HS/GND

R7-

R7+

R6-

R6+

DIFFB

DIFFSENSE

M/S

VREF

R2+

HS/GND

36Pin SSOP

1

2

3

4

28

27

26

25

5

6

7

8

9

10

11

12

13

14

24

23

22

21

20

19

16

17

15

18

33

32

31

30

29

36

35

34