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参数资料
| 型号： | G261P1U |
| 厂商： | Global Mixed-mode Technology Inc. |
| 英文描述： | Low Voltage Differential (LVD) SCSI 27 Line Regulator Set |
| 中文描述： | 低压差分（LVD）的SCSI 27线调节器集 |
| 文件页数： | 3/5页 |
| 文件大小： | 227K |
| 代理商： | G261P1U |
Ver 3.2
Dec 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G261
Global Mixed-mode Technology Inc.
Application Information
Figure 1. LVD SCSI Discrete Resistor Stack
Table1. Resistor Network v.s Standard
OUTPUTS
SPECIFICATION
107.3 Diff
100 to 110
112.9mV Diff Bias
100mV to 125mV
237 Common Mode
100 to 300
1.25V Common Mode
1.2V to 1.30V
Application Note: The resistor network, along with the 1.75V and 0.75V references will give the correct dif-
ferential impedance, bias voltage, common mode impedance and common mode voltage as show in Table
1.
Layout guideline:
1. For stable operation, the 1F capacitor on TERMPWR pin and 4.7F capacitors on REG1 and REG2
pins must be placed within 0.25 inch of their respective pins.
2. The PCB trace length form Lx- and Lx+ to the connector pins (all 27pairs) must be of equal length, in or-
der to minimize the signal skew among these pairs. In addition, these traces must be as short as possible,
in order to minimize capacitance.
REF
1.3V
SOURCE/SINK REGULATOR
50 mA SOURCE/SINK
TERMPWR
50 mA SOURCE/SINK
DIFFSENSE
REG1
REG2
SOURCE 5 to 15mA
REF
1.75V
REF
0.75V
SOURCE/SINK REGULATOR
4.7F
121 1%
L1-
L1+
L27-
L27+
475 1%
PGND
475 1%
1.3V ±0.1V
1.75V ±50mV
0.75V ±50mV
1F
DIFFSENSE: SOURCE ONLY
FROM TERMPWR
to DIFFSENS pin
REF
1.3V
SOURCE/SINK REGULATOR
50 mA SOURCE/SINK
TERMPWR
50 mA SOURCE/SINK
DIFFSENSE
REG1
REG2
SOURCE 5 to 15mA
REF
1.75V
REF
0.75V
SOURCE/SINK REGULATOR
4.7F
121 1%
L1-
L1+
L27-
L27+
475 1%
PGND
475 1%
1.3V ±0.1V
1.75V ±50mV
0.75V ±50mV
1F
DIFFSENSE: SOURCE ONLY
FROM TERMPWR
to DIFFSENS pin
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