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TL-SCSI285

更新时间： 2024-11-04 22:19:35
品牌 Logo 应用领域
德州仪器 - TI 稳压器
页数 文件大小 规格书
6页 84K
描述
FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION

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TL-SCSI285 数据手册

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TL-SCSI285  
FIXED-VOLTAGE REGULATORS  
FOR SCSI ACTIVE TERMINATION  
SLVS065F – NOVEMBER 1991 – REVISED JULY 1999  
PW PACKAGE  
(TOP VIEW)  
Fully Matches Parameters for SCSI  
Alternative 2 Active Termination  
Fixed 2.85-V Output  
1
2
3
4
5
6
7
8
9
10  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
±1% Maximum Output Tolerance at  
HEAT  
SINK  
HEAT  
SINK  
T = 25°C  
J
0.7-V Maximum Dropout Voltage  
620-mA Output Current  
GND  
OUTPUT  
GND  
INPUT  
±2% Absolute Output Variation  
Internal Overcurrent-Limiting Circuitry  
Internal Thermal-Overload Protection  
Internal Overvoltage Protection  
HEAT  
SINK  
HEAT  
SINK  
HEAT SINK – These terminals have  
an internal resistive connection to  
ground and should be grounded or  
electrically isolated.  
description  
The TL-SCSI285 is a low-dropout (0.7-V)  
fixed-voltage regulator specifically designed for  
small computer systems interface (SCSI)  
alternative 2 active signal termination. The  
TL-SCSI285 0.7-V maximum dropout ensures  
compatibility with existing SCSI systems, while  
providing a wide TERMPWR voltage range. At the  
same time, the ±1% initial tolerance on its 2.85-V  
output voltage ensures a tighter line-driver current  
tolerance, thereby increasing the system noise  
margin.  
KC PACKAGE  
(TOP VIEW)  
OUTPUT  
GND  
INPUT  
The GND terminal is in electrical  
contact with the mounting base.  
The fixed 2.85-V output voltage of the TL-SCSI285 supports the SCSI alternative 2 termination standard, while  
reducing system power consumption. The 0.7-V maximum dropout voltage brings increased TERMPWR  
isolation, making the device ideal for battery-powered systems. The TL-SCSI285, with internal current limiting,  
overvoltage protection, ESD protection, and thermal protection, offers designers enhanced system protection  
and reliability.  
When configured as a SCSI active terminator, the TL-SCSI285 low-dropout regulator eliminates the 220-Ω and  
the330-Ωresistorsrequiredforeachtransmissionlinewithapassiveterminationscheme, reducingsignificantly  
the continuous system power drain. When placed in series with 110-Ω resistors, the device matches the  
impedance level of the transmission cable and eliminates reflections.  
The TL-SCSI285 is characterized for operation over the virtual junction temperature range of 0°C to 125°C.  
AVAILABLE OPTIONS  
PACKAGED DEVICES  
CHIP  
PLASTIC  
POWER  
(KC)  
SURFACE  
MOUNT  
(PW)  
FORM  
(Y)  
T
J
0°C to 125°C TL-SCSI285KC  
TL-SCSI285PWR  
TL-SCSI285Y  
The PW package is only available taped and reeled. Chip forms are tested  
at 25°C.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Copyright 1999, Texas Instruments Incorporated  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
123456

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