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SS8219G

12/06/2005 Rev.3.01

Ultra320 Multi-mode LVD/SE SCSI Terminator

PRODUCT SUMMARY

Auto-selectable 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)

and Ultra320 (SPI-4 LVD) standards

Supports active negation

Channel capacitance of 3pF

Operation from 2.9V to 5.5V

Thermal protection

Hot-swap compatible

Tolerance of 5% on termination resistance

Available in 28 pin TSSOP or 36 pin SSOP

APPLICATIONS

High performance data storage systems in servers,

workstations, high-end and industrial PCs, and RAID

disk arrays.

DESCRIPTION

The SS8219G multi-mode LVD/SE SCSI terminator

provides a smooth transition between modes of the

SCSI Parallel Interface. It automatically senses the bus

via DIFFSENS and switches the termination to either

single-ended (SE) or low voltage differential (LVD) SCSI,

based on which type of devices are connected to the bus.

If the SS8219G detects an HVD SCSI device, it switches

to a high impedance state.

A 16-bit wide SCSI bus requires three SS8219G for

termination.

This multi-mode terminator contains all the functions

to terminate, auto detect and switch modes for SCSI

Parallel Interface (SPI) bus architectures.

For SE termination, one regulator and nine precision 110

Ω

resistors are used.

For LVD termination, the SS8219G 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

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

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

28 pin 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

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

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

36 pin 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

Pb-free, RoHS compliant.

SPI mode auto-detection/switching.

Pin/pin compatible with popular industry

standard parts DS2118/9 and UCC5672

FEATURES