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DS2109S PDF预览

DS2109S

更新时间: 2024-02-25 14:52:26
品牌 Logo 应用领域
达拉斯 - DALLAS /
页数 文件大小 规格书
10页 89K
描述
Plug and Play SCSI Terminator

DS2109S 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:5.72Is 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:17.905 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封装形状:RECTANGULAR
封装形式:SMALL OUTLINE峰值回流温度(摄氏度):245
标称上拉电阻:110 Ω认证状态:Not Qualified
座面最大高度:2.67 mm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:7.495 mm
Base Number Matches:1

DS2109S 数据手册

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DS2109  
DS2109  
Plug and Play SCSI Terminator  
FEATURES  
PIN ASSIGNMENT  
Fully compliant with SCSI–1, Fast SCSI and Ultra  
PDI  
R1  
1
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
GND  
R18  
SCSI  
2
Compatible with Plug and Play SCSI Profile  
Functionally compatible with DS21S07A  
Provides active termination for 18 signal lines  
R2  
3
R17  
R3  
4
R16  
R4  
5
R15  
R5  
6
R14  
HS–GND  
HS–GND  
PDO  
R6  
7
TCS  
HS–GND  
PDE  
R13  
2% tolerance on termination resistors and voltage  
regulator  
8
9
Bus termination sensing  
10  
11  
12  
13  
14  
R7  
R12  
Low power down capacitance of 3 pF  
Onboard thermal shutdown circuitry  
R8  
R11  
R9  
R10  
TPWR  
V
REF  
DS2109, DS2109S 28–PIN SOIC (300 MIL)  
DESCRIPTION  
The DS2109 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 exter-  
naldeviceisconnectedtothesystem. TheDS2109sat-  
isfies 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  
DS2109 will automatically be isolated from the SCSI  
bus thereby maintaining proper system termination.  
The DS2109 integrates a low drop–out regulator, 18  
precise switched 110 ohm termination resistors, and  
bus termination sensors into a 28–pin 300 mil SOIC  
package. Active termination provides: greater immu-  
nity to voltage drops on the TERMPWR (TERMination  
PoWeR) line, enhanced high–level noise immunity,  
intrinsic TERMPWR decoupling, and very low quies-  
cent current consumption. The DS2109 contains an  
output port that can control the power down pin of addi-  
tional terminators (DS21S07A) for Wide SCSI applica-  
tions.  
022698 1/10  

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