SiP5630

Vishay Siliconix

New Product

Document Number: 73007

S-41263—Rev. A, 05-Ju1-04

www.vishay.com

1

9-Line SCSI Bus Terminators

FEATURES

D Auto Selection of S/E or LVD SCSI Termination

D 2.7-V to 5.25-V TERMPWR Range

D Meets SCSI-1, SCSI-2, SPI-2 (ULTRA-2), SPI-3

(ULTRA-160) and SPI-4 (ULTRA-320) Standards

D Differential Failsafe Bias

D Thermal Package

D On-Chip Thermal Shutdown Circuit

D Master/Slave Input

D Active Negation

D Hot Swap Compatible

D Pin Compatible with UCC5630 and UCC5670

D Lead (Pb)-Free QSOP-36 Package

APPLICATIONS

D Disk Array (RAID)

D Storage Area Networks (SAN)

D Network Attached Storage (NAS)

D SCSI Cable

D Server and Workstation

D Industrial Computers

D High-End Personal Computers

DESCRIPTION

The SiP5630 provides active bus termination suitable for all

SCSI bus operational modes from SCSI-1 through SPI-4

(Ultra 320). The termination includes impedance matching of

the SCSI bus to minimize signal reflections from the end of the

bus, as well as required SCSI bus biasing for either S/E (Single

Ended) or LVD (Low Voltage Differential) operation.

The SiP5630 has nine (9) output channels (T1-T9). Each

output channel provides termination for one SCSI data signal,

parity signal or control signal. Two SiP5630 ICs provide

complete termination for a narrow SCSI Bus; three ICs provide

complete termination for a wide SCSI bus.

The SiP5630 senses the operational state of the SCSI bus via

the DIFFSENS bus signal, and automatically switches to S/E

or LVD operation as required. It cannot be used on an HPD

(High Power Differential) SCSI bus, and goes into high

impedance mode when the voltage on the DIFFSENS line

indicates HPD operation. The SiP5630 also presents high

impedance to the SCSI bus if the DISABLE pin is asserted, or

if TERMPWR is removed from the IC.

The SiP5630 is available in a lead (Pb)-free QSOP-36

package for operation over the temperature range of 0 to

70_C.

FUNCTIONAL BLOCK DIAGRAM

See Functional Diagrams

(Page 6) for detailed descriptions

of SCSI Terminator Impedance

Circuits in LVD and S/E modes of

operation.

17

21

35

34

33

36

Heat Sink GND Pins

GND

REG

1.3 V

8

9

10

26

27

28

1

18

Enable

Current Limited

Source/Sink

Regulator

Comparators

V t 0.5 = S/E

0.7 t V t1.9 = LVD

V u 2.4 = HPD

HPD

LVD

S/E TERMPWR

20

19

5

4

32

31

Current Limited

Source/Sink

Regulator

Mode Control And

Enable/Disable

Circuitry

SCSI

Terminator

Impedance

Circuits

10 mA

MODE

DISABLE

DIFFS

MSTR/SLV

T1N

T1P

T9P

T9N