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G261 の電気的特性と機能

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。


製品の詳細 ( Datasheet PDF )

部品番号 G261
部品説明 Low Voltage Differential (LVD) SCSI 27 Line Regulator Set
メーカ GMT
ロゴ GMT ロゴ 




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G261 Datasheet, G261 PDF,ピン配置, 機能
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 (475, 121, and
475). 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
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G261 pdf, ピン配列
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
107.3Diff
112.9mV Diff Bias
237Common Mode
1.25V Common Mode
SPECIFICATION
100to 110
100mV to 125mV
100to 300
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


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