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參數(shù)資料
| 型號： | G218BT-S4F |
| 廠商： | Global Mixed-mode Technology Inc. |
| 英文描述： | Ultra160 Multi-mode LVD/SE SCSI Terminator |
| 中文描述： | Ultra160的多模內(nèi)徑/東南的SCSI終結(jié)者 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 195K |
| 代理商： | G218BT-S4F |
Ver 1.4
Apr 07, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
8
G218B
Global Mixed-mode Technology Inc.
Pin Description (for 28pin SSOP/TSSOP)
PIN
SYMBOL
DESCRIPTION
1
VREF*
Reference Voltage. 2.85-volt reference; must be connected to a 4.7F 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 G218B 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 0.1F 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 2.2F 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 4.7F 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 G218 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 0.1F 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 2.2F capacitor.
*The VREF keeps the level at 2.85 volt, despite the DISCNCT pin is asserted or not; even the termination mode is changed.
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