ss8219g Silicon Standard Corporation, ss8219g Datasheet - Page 8

• Manufacturer Part Number: ss8219g
• Description: Ultra320 Multi-mode Lvd/se Scsi Terminator
• Manufacturer: Silicon Standard Corporation

12/10/2005 Rev.3.01
PIN DESCRIPTION (for 28pin TSSOP)
PIN DESCRIPTION (for 36pin SSOP)
18-21, 23-26
*The VREF keeps the level at 2.85 volts, whether the DISCNCT pin is asserted or not; even if the termination mode is changed.
*The VREF keeps the level at 2.85 volts, whether the DISCNCT pin is asserted or not; even if the termination mode is changed.
8, 9,10,26,
4-7,11-16,
2-5,7-12,
22-25,
29-32
27,28
27,28
6,22
PIN
PIN
2,3
13
14
15
16
17
17
18
19
20
21
33
34
35
36
1
1
NC/ HS GND No Connect/Heat Sink Ground. Should be grounded for heat sinking purpose
DIFFSENSE Output to drive the SCSI bus DIFFSENS line.
DIFFSENSE Output to drive the SCSI bus DIFFSENS line.
SYMBOL
SYMBOL
DISCNCT
DISCNCT
Rx+, Rx-
HS/GND
VREF*
DIFFB
TPWR
DIFFB
TPWR
VREF
GND
GND
HVD
LVD
M/S
Rx+
M/S
Rx-
NC
SE
Reference Voltage. 2.85-volt reference in SE mode and 1.25V in LVD mode; must be connected to
a 4.7µF capacitor.
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.
Disconnect. When pulled high, the SS8219G isolates its bus pins (Rx+, Rx-) from the SCSI bus.
Ground. Terminator ground pin. Connected to ground.
Master/slave. Used to select which terminator is the controlling device. M/S pin high enables
the DIFFSENSE driver.
An input pin to detect the type of device (differential or single-ended) on the SCSI bus. The
DIFFB pin should be connected by a 0.1µF capacitor to GND and by a 20kΩ resistor to the SCSI
bus DIFFSENS line.
Terminator Power. Connect to the SCSI TERMPWR line and de-couple with a 2.2µF capacitor.
Reference Voltage. 2.85-volt reference; must be connected to a 4.7µF capacitor.
No Connect. Do not connect these pins.
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.
Heat Sink Ground. Connect to large area PC board traces to increase power dissipation
capability.
Disconnect. When pulled high, the SS8219G isolates its bus pins (Rx+, Rx-) from the SCSI bus.
Ground. Terminator ground pin. Connected to ground.
Master/slave. Used to select which terminator is the controlling device. M/S pin high enables
the DIFFSENSE driver.
An input pin to detect the type of device (differential or single-ended) on the SCSI bus. The
DIFFB pin should be connected by a 0.1µF capacitor to GND and 20kΩ resistor to the SCSI bus
Single ended mode indicator. It is HIGH when terminator is operating in SE mode.
Low Voltage Differential mode indicator. It is HIGH when terminator is operating in LVD mode.
High Voltage Differential mode indicator. It is HIGH when terminator is operating in HVD mode
Terminator Power. Connect to SCSI bus TERMPWR line and decouple with 2.2µF capacitor.
DIFFSENS line.
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DESCRIPTION
DESCRIPTION
SS8219G
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