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SS8218

Rev.2.01 6/06/2003

PIN

SYMBOL

DESCRIPTION

1

VREF*

Reference Voltage. 2.85-volt reference; must be connected to a 4.7µF capacitor.

2-5,7-12,

18-21, 23-26

Rx+, Rx-

Signal Termination. (X=1,2,3,…..9)

Rx+: Ground line for single-ended or positive line for differential applications for the SCSI bus.

Rx-: Signal line/active line for single-ended or negative line in differential applications for the SCSI

bus.

6,22

NC/ HS GND No Connect/ HS GND. Should be grounded for heat sinking purpose.

13

DISCNCT

Disconnect. When pulled high, the SS8218 isolates its bus pins (Rx+, Rx-) from the SCSI bus.

14

GND

Ground. Terminator ground pin. Connected to ground.

15

M/S

Master/slave. Used to select which terminator is the controlling device. M/S pin high enables the

DIFFSENSE driver.

16

DIFFSENSE Output to drive the SCSI bus DIFFSENS line.

17

DIFFB

DIFFB pin should be connected to a 0.1µF capacitor to GND and 20k resistor to SCSI/Bus

DIFFSENS line. An input pin to detect the type of device (differential or single-ended) on the SCSI

bus.

27,28

TPWR

Terminator Power. Connect to the SCSI TERMPWR line and de-couple with a 2.2µF capacitor.

*The VREF keeps the level at 2.85 volt, despite the DISCNCT pin is asserted or not; even the termination mode is changed.

(36pin SSOP)

PIN

SYMBOL

DESCRIPTION

1

VREF*

Reference Voltage. 2.85-volt reference; must be connected to a 4.7µF capacitor.

2,3

NC

No Connect. Do not connect these pins.

4-7,11-16,

22-25,

29-32

Rx+

Rx-

Signal Termination. (X=1,2,3,…..9)

Rx+: Ground line for single-ended or positive line for differential applications for the SCSI bus.

Rx-: Signal line/active line for single-ended or negative line in differential applications for the SCSI bus.

8, 9,10,26,

27,28

HS/GND

Heat Sink Ground. Connect to large area PC board traces to increase power dissipation capabil-

ity.

17

DISCNCT

Disconnect. When pulled high, the SS8218 isolates its bus pins (Rx+, Rx-) from the SCSI bus.

18

GND

Ground. Terminator ground pin. Connected to ground.

19

M/S

Master/slave. Used to select which terminator is the controlling device. M/S pin high enables the

DIFFSENSE driver.

20

DIFFSENSE Output to drive the SCSI bus DIFFSENS line.

21

DIFFB

DIFFB pin should be connected to a 0.1µF capacitor to GND and 20k resistor to SCSI/Bus

DIFFSENS line. An input pin to detect the type of device (differential or single-ended) on the SCSI

bus.

33

SE

Single ended mode indicator. It is HIGH when terminator is operating in SE mode.

34

LVD

Low Voltage Differential mode indicator. It is HIGH when terminator is operating in LVD mode.

35

HVD

High Voltage Differential mode indicator. It is HIGH when terminator is operating in HVD mode

36

TPWR

Terminator Power. Connect to SCSI bus TERMPWR line and decouple with 2.2µF capacitor.

*The VREF keeps the level at 2.85 volt, despite the DISCNCT pin is asserted or not; even the termination mode is changed.