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DS2108S+ PDF预览

DS2108S+

更新时间: 2024-01-30 03:38:06
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
5页 72K
描述
SCSI Terminator, 9-Line, 330ohm, PDSO24, 0.300 INCH, PLASTIC, SOIC-24

DS2108S+ 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Active零件包装代码:SOIC
包装说明:SOP,针数:24
Reach Compliance Code:unknown风险等级:5.66
差分输出:YES接口集成电路类型:SCSI BUS TERMINATOR
JESD-30 代码:R-PDSO-G24JESD-609代码:e3
长度:17.9 mm湿度敏感等级:1
功能数量:1信号线数量:9
端子数量:24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):260
标称上拉电阻:330 Ω认证状态:COMMERCIAL
座面最大高度:2.68 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

DS2108S+ 数据手册

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DS2108  
Differential SCSI Switchable Terminator  
www.dalsemi.com  
FEATURES  
PIN ASSIGNMENT  
Fully compliant with SCSI, SCSI-2 and SCSI-  
3 standards  
1
2
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
TPWR  
R1N  
PD  
Conforms to EIA RS-485 standard  
Provides differential termination for 9 pairs of  
signal lines  
Operates with SCSI signal voltages of -7 to  
+12 Volts  
Laser-trimmed 330 and 150-ohm termination  
resistors have ±5% tolerance over full  
temperature range  
Switchable power-down mode  
Low power down capacitance of 6 pF  
24-pin plastic SOIC (DS2108S)  
GND  
R1P  
R2P  
3
R2N  
R3N  
4
5
6
7
8
R4N  
R5N  
R6N  
R7N  
R8N  
R9N  
TPWR  
NC  
R3P  
R4P  
R5P  
R6P  
R7P  
R8P  
R9P  
GND  
9
10  
11  
12  
DS2108S 24-Pin SOIC (300-mil)  
DESCRIPTION  
The DS2108 SCSI Terminator has been specifically designed for High Voltage Differential (HVD) SCSI  
systems requiring switchable termination. The DS2108 integrates eighteen 330-ohm and nine 150-ohm  
precise switched termination resistors into a monolithic IC. The surface mount SOIC package saves board  
space over conventional resistor SIPs. The termination resistors can be isolated from the SCSI bus under  
software or hardware control. While in the powered down mode, the DS2108 isolates the nine terminator  
blocks from the bus while adding only 6 pF capacitance to each signal line of the SCSI bus.  
FUNCTIONAL DESCRIPTION  
The DS2108 consists of power-down circuitry, eighteen 330-ohm and nine 150-ohm termination resistors  
(Figure 1). The DS2108 can be removed from the circuit by bringing the power down pin (PD) low. The  
power down capacitance on the terminating resistors is 6 pF, well below the SCSI-3 allotment of 25 pF.  
The DS2108 supports SCSI signal voltages of -7 to +12 volts when powered on or off. When all lines  
settle into the quiescent state (no signal transitions), 56 mA is typically consumed. Only 1 mA is  
typically consumed in the powered down mode.  
1 of 5  
112099  

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