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G261のメーカーはGMTです、この部品の機能は「Low Voltage Differential (LVD) SCSI 27 Line Regulator Set」です。 |
部品番号 | G261 |
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部品説明 | Low Voltage Differential (LVD) SCSI 27 Line Regulator Set | ||
メーカ | GMT | ||
ロゴ | |||
このページの下部にプレビューとG261ダウンロード(pdfファイル)リンクがあります。 Total 5 pages
www.DataSheet4U.com
Global Mixed-mode Technology Inc.
G261
Low Voltage Differential (LVD) SCSI 27 Line Regu-
lator Set
Features
SCSI SPI-2 (Ultra 2), SPI-3 (Ultra 3/Ultra 160)
and SPI-4 (Ultra 320) LVD SCSI, 27 Line Low
Voltage Differential Regulator
4V to 5.25V Operation
Integrated Regulator Set for LVD SCSI
Differential Failsafe Bias
Applications
SCSI cable
SCSI card
Disk Array
Industrial PC
POS
Description
The G261 LVD Regulator set is designed to provide
the correct reference voltages and bias currents for
LVD termination resistor networks (475Ω, 121Ω, and
475Ω). The device also provides a 1.3V output for
DIFFSENSE signaling. With the proper resistor net-
work, the G261 solution will meet the common mode
impedance, differential mode impedance, differential
bias voltage and common mode voltage requirements
of SPI-2 (Ultra2), SPI-3 (Ultra 3/Ultra 160) and SPI-4
(Ultra 320).
This device contains two sink / source reference volt-
age regulators, a 1.3V buffered output and protection
features. The protection features include thermal
shutdown and active current limiting circuitry. The
G261 is offered in 8 pin SOP and 16pin SOP.
Ordering Information
ORDER
NUMBER
G261P1U
G261P3U
ORDER NUMBER TEMP.
(Pb free)
RANGE
G261P1Uf
0°C~70°C
G261P3Uf
0°C~70°C
PACKAGE
SOP-8
SOP-16
Pin Configuration
REG2 1
HSPGND 2
HSPGND 3
REG1 4
G261
SOP-8
8 TERMPWR
7 HSGND
6 HSGND
5 DIFFSENSE
NC 1
TERMPWR 2
REG2 3
HSPGND 4
HSGND 5
REG1 6
DIFFSENSE 7
NC 8
G261
SOP-16
16 NC
15 NC
14 NC
13 HSGND
12 HSGND
11 NC
10 NC
9 NC
Ver 3.2
Dec 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
1
1 Page Global Mixed-mode Technology Inc.
Application Information
G261
TERMPWR
1µF
PGND
DIFFSENSE: SOURCE ONLY
FROM TERMPWR
REF
1.3V
1.3V ±0.1V
SOURCE 5 to 15mA
SOURCE/SINK REGULATOR
REF
1.75V
1.75V ±50mV
50 mA SOURCE/SINK
SOURCE/SINK REGULATOR
REF
0.75V
0.75V ±50mV
50 mA SOURCE/SINK
DIFFSENSE
to DIFFSENS pin
REG1
4.7µF
REG2
4.7µF
475 1%
L1-
121 1%
475 1%
L1+
475 1%
475 1%
121 1%
L27-
L27+
Figure 1. LVD SCSI Discrete Resistor Stack
Table1. Resistor Network v.s Standard
OUTPUTS
107.3Ω Diff
112.9mV Diff Bias
237Ω Common Mode
1.25V Common Mode
SPECIFICATION
100Ω to 110Ω
100mV to 125mV
100Ω to 300Ω
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 1µF capacitor on TERMPWR pin and 4.7µF 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.
Ver 3.2
Dec 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
3
3Pages | |||
ページ | 合計 : 5 ページ | ||
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PDF ダウンロード | [ G261 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
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