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DS21T09S PDF预览

DS21T09S

更新时间: 2024-10-28 20:44:11
品牌 Logo 应用领域
美信 - MAXIM 光电二极管接口集成电路
页数 文件大小 规格书
10页 224K
描述
SCSI Terminator, 18-Line, 110ohm, MOS, PDSO28, 0.300 INCH, SOIC-28

DS21T09S 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
零件包装代码:SOIC包装说明:0.300 INCH, SOIC-28
针数:28Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.84Is Samacsys:N
差分输出:NO接口集成电路类型:SCSI BUS TERMINATOR
JESD-30 代码:R-PDSO-G28JESD-609代码:e0
长度:17.9 mm湿度敏感等级:1
功能数量:1信号线数量:18
端子数量:28最高工作温度:70 °C
最低工作温度:封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装等效代码:SOP28,.4
封装形状:RECTANGULAR封装形式:SMALL OUTLINE
峰值回流温度(摄氏度):240电源:5 V
标称上拉电阻:110 Ω认证状态:Not Qualified
座面最大高度:2.65 mm子类别:Bus Terminators
最大供电电压:5.25 V最小供电电压:4 V
标称供电电压:5 V表面贴装:YES
技术:MOS温度等级:COMMERCIAL
端子面层:Tin/Lead (Sn/Pb)端子形式:GULL WING
端子节距:1.27 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIED宽度:7.5 mm
Base Number Matches:1

DS21T09S 数据手册

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DS21T09  
Plug and Play SCSI Terminator  
www.dalsemi.com  
FEATURES  
PIN ASSIGNMENT  
Fully compliant with SCSI-1, Fast SCSI and  
Ultra SCSI  
PDI  
1
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
GND  
R18  
R17  
R16  
R15  
R14  
TCS  
HS-GND  
PDE  
R13  
2
3
4
R1  
R2  
R3  
Compatible with Plug and Play SCSI Profile  
Functional drop in replacement for the  
DS2109  
5
6
R4  
R5  
Complementary part to DS21T07 for wide  
SCSI  
7
8
9
10  
11  
12  
13  
14  
HS-GND  
HS-GND  
PDO  
R6  
Provides active termination for 18 signal lines  
2% tolerance on termination resistors and  
voltage regulator  
R12  
R11  
R10  
VREF  
R7  
R8  
R9  
Bus termination sensing  
Low power-down capacitance of 3 pF  
Onboard thermal shutdown circuitry  
TPWR  
DS21T09S
28-Pin SOIC (300-mil)  
DESCRIPTION  
The DS21T09 is intended for one-chip Plug and Play (PnP) SCSI termination. Plug and Play SCSI  
requires the exit-point terminator on computer motherboards or host bus adapters to automatically switch  
off if an external device is connected to the system. The DS21T09 satisfies this requirement by offering  
the engineer a choice of onboard current sensing circuitry or onboard ground detect circuitry. If an  
external device is connected, the DS21T09 will automatically be isolated from the SCSI bus thereby  
maintaining proper system termination.  
The DS21T09 integrates a low drop-out regulator, 18 precisely switched 110=termination resistors, and  
bus termination sensors into a 28-pin, 300-mil SOIC package. Active termination provides: greater  
immunity to voltage drops on the TERMPWR (TERMination PoWeR) line, enhanced high-level noise  
immunity, intrinsic TERMPWR decoupling, and very low quiescent current consumption. The DS21T09  
contains an output port that can control the power-down pin of additional terminators (DS21T07) for  
Wide SCSI applications.  
REFERENCE DOCUMENTS  
SCSI-2 (X3.131-1994)  
SCSI-3 Parallel Interface (X3T10/855D)  
Available from: Global Engineering Documents  
15 Inverness Way East  
Englewood, CO 80112-5704  
Phone: (800) 854-7179, (303) 792-2181  
Fax: (303) 792-2192  
1 of 10  
112099  

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