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參數(shù)資料
| 型號： | DS2125+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/7頁 |
| 文件大小： | 0K |
| 描述： | IC TERM SCSI ULT3 LVD/SE 48-LQFP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 類型： | SCSI，LVD，SE |
| 端子數(shù)： | 15 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 帶卷 (TR) |
DS2125 Ultra3 LVD/SE SCSI 15-Line Terminator
6 of 7
The DS2125’s DIFF_CAP pin monitors the DIFFSENS line to determine the device’s proper operating mode. The
DIFFSENSE pin can also drive the SCSI DIFFSENS line to determine the SCSI bus-operating mode. The DS2125
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
A precision laser-trimmed resistor string with two amplifiers provides LVD termination. This configuration yields
105
differential and 150 common-mode impedance. A 112mV fail-safe bias 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). The terminating resistors maintain their 110
value.
HVD ISOLATION MODE
The DS2125 identifies that there is an HVD 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, and VREF remains active. During
thermal shutdown, the termination pins are isolated from the SCSI bus, and VREF becomes high impedance. The
DIFFSENSE driver is shut down during either of these two events. An internal pulldown resistor assures that the
DS2125 is terminating the bus if the ISO pin is left floating.
To ensure proper operation, the TPWR pin should be connected to the SCSI bus TERMPWR line. As with all
analog circuitry, the TERMPWR and VDD lines should be bypassed locally. A 2.2F capacitor and a 0.01F high-
frequency capacitor are recommended between TPWR and ground, and placed as close as possible to the
DS2125. The DS2125 should be placed as close as possible to the SCSI connector to minimize signal and power
trace length, thereby resulting in less input capacitance and reflections, which can degrade the bus signals.
To maintain the specified regulation, a 4.7
F capacitor is required between the VREF pin and ground of each
DS2125. A high-frequency capacitor (0.1
F ceramic recommended) can also be placed on the VREF pin in
applications that use fast rise/fall-time drivers. Figure 2 shows a typical SCSI bus configuration.
REFERENCE DOCUMENTS
TITLE
T10 PROJECT
DOCUMENT
T10 COMMITTEE FTP LINK
ANSI
DOCUMENT NO.
SCSI Parallel Interface 2 (SPI-2)
Project: 1142-M, 1998
X3.302:1998
SCSI Parallel Interface 3 (SPI-3)
Project: 1302-D, 1999
NCITS.336:2000
SCSI Parallel Interface 4 (SPI-4)
Project: 1365-D, 200x
INCITS.362:2002
SUPPLIERS
SUPPLIER
PHONE
WEBSITE
American National Standards Institute (ANSI)
212-642-4900
Global Engineering Documents
800-854-7179
CHIP INFORMATION
TRANSISTOR COUNT: 8382 MOS and 87 BiPOLAR
PROCESS: BiCMOS
SUBSTRATE CONNECTED TO GROUND
THERMAL INFORMATION
Theta-JA: 65°C/W
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2127 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra3 LVD/SE SCSI 14-Line Terminator |
| DS2127/T&R | 制造商:Maxim Integrated Products 功能描述:14 LINE LVD/SE TERMINATOR T&R - Tape and Reel |
| DS2127+ | 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 |
| DS2127+T&R | 制造商:Maxim Integrated Products 功能描述:IC TERM SCSI LVD/SE 48-LQFP |
| DS2127+T&R | 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 |
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