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參數(shù)資料
| 型號： | DS2117MX/T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/9頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TERM SCSI LVD/SE ULT-3 FCHIP |
| 標(biāo)準(zhǔn)包裝： | 10,000 |
| 類型： | SCSI，LVD，SE |
| 端子數(shù)： | 9 |
| 電源電壓： | 4 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 36-BSOP（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 36-SSOP |
| 包裝： | 帶卷 (TR) |
DS2117M
2 of 9
REFERENCE DOCUMENTS
Small Computer Systems Interface (SCSI-3) SCSI Parallel Interface (SPI) Project: 0855-M, 1995
Small Computer Systems Interface (SCSI-3) SCSI Parallel Interface 2 (SPI-2) Project: 1142-M, 1998
Small Computer Systems Interface (SCSI-3) SCSI Parallel Interface 3 (SPI-3) Project: 1302-D, 1999
Small Computer Systems Interface (SCSI-3) SCSI Parallel Interface 4 (SPI-4) Project: 1365-D, xxxx
AVAILABLE FROM:
American National Standards Institute (ANSI) Phone: (212) 642-4900
Global Engineering Documents 15 Inverness Way East; Englewood, CO 80112 Phone: (800) 854-7179
FUNCTIONAL DESCRIPTION
The DS2117 combines LVD and SE termination with DIFFSENSE sourcing and detection.
A bandgap reference is fed into two amplifiers, which creates a 1.25V reference voltage and a 2.85V
reference voltage. The control logic determines which of these references are applied to the termination
resistors. If the SCSI bus is in LVD mode, the 1.25V reference is used. If the SCSI bus is in SE mode, the
2.85V reference is used. That same control logic switches in/out parallel resistors to change the total
termination resistance accordingly. Finally, in SE mode the RP pins are switched to ground.
The DIFFSENSE circuitry decodes trinary logic. There will be one of three voltages on the SCSI control
line called DIFFSENS. Two comparators and a NAND gate determine if the voltage is below 0.6V, above
2.15V, or in between. That indicates the mode of the bus to be HVD, SE, or LVD, respectively.
The DS2117M’s DIFF_CAP pin monitors the DIFFSENS line to determine the proper operating mode of
the device; this mode is indicated by the SE/LVD/HVD outputs. The DIFFSENSE pin can also drive the
SCSI DIFFSENS line (when MSTR/SLV = 1) to determine the SCSI bus operating mode. The DS2117M
switches to the termination mode that is appropriate for the bus based on the value of the DIFFSENS
voltage. These modes are LVD mode, SE mode, and HVD isolation mode.
LVD Mode
LVD termination is provided by a precision laser-trimmed resistor string with two current sources. This
configuration yields a 105
differential and 150 common-mode impedance. A fail-safe bias of 112mV
is maintained when no drivers are connected to the SCSI bus.
SE Mode
When the external driver for a given signal line turns off, the active terminator pulls that signal line to
2.85V (quiescent state). When used with an active negation driver, the power amp can sink 22mA per line
while keeping the voltage reference in regulation. The terminating resistors maintain their 110
value.
HVD Isolation Mode
The DS2117M identifies that there is an HVD (high voltage differential) device on the SCSI bus and
isolates the termination pins from the bus.
When ISO is pulled high, the termination pins are isolated from the SCSI bus, VREF is grounded, and the
bus mode indicators (SE/LVD/HVD) remain active. During thermal shutdown, the termination pins are
isolated from the SCSI bus, VREF is grounded, and the bus mode indicators (SE/LVD/HVD) remain
active. The DIFFSENSE driver is shut down during either of these two events.
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| DS2118MB+T&R | IC TERM SCSI LVD/SE ULT-3 36SSOP |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2118M | 功能描述:IC TERM SCSI LVD/SE ULT-3 36SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 信號終端器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:SCSI，SE 端子數(shù):9 電源電壓:4 V ~ 5.25 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:管件 |
| DS2118MB | 功能描述:SCSI 接口集成電路 RoHS:否 制造商:Texas Instruments 工作電源電壓:2.7 V to 5.25 V 電源電流:13 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSOP-36 封裝:Tube |
| DS2118MB/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC TERM SCSI LVD/SE ULT-3 36SSOP |
| DS2118MB/T&R | 功能描述:SCSI 接口集成電路 Ultra3 LVD/SE SCSI Terminator RoHS:否 制造商:Texas Instruments 工作電源電壓:2.7 V to 5.25 V 電源電流:13 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSOP-36 封裝:Tube |
| DS2118MB/T,R | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra3 LVD/SE SCSI Terminator |
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