AR7519

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ETC1
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描述：
AR7519 - Ultra Multimode LVD/SE SCSI Terminator - List of Unclassifed Manufacturers

数据手册：

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AR7519 数据手册

T he wireless communication solution provider Ultra Multimode LVD/SE SCSI Terminator FEATURES AR7519 „Y Meets SCSI-1, SCSI-2, Ultra2, and Ultra3/Ultra160 standards. „Y A uto-selectable multimode for single-ended or low voltage differential termination. „Y C urrent limit and thermal shutdown protection. Ground driver integrated for single-ended operation „Y S CSI bus hot-swap compatible. „Y C ompatible with active negation drivers. APPLICATIONS P C server Workstation DESCRIPTION The AR7519 multimode SCSI terminator is both a single-ended (SE) and a low voltage differential (LVD) terminator that meets the specification of SCSI parallel interface (SPI-3). In addition, the AR7519 provides backward compatibility to the SCSI-1, SCSI-2, and SE specifications. The multimode terminator contains all functions required to terminate and auto detect for SCSI devices without hardware fluctuation. Auto-selection is achieved by using voltage detection on the DIFFSENSE signal. The AR7519 senses the DIFFSENSE line while sourcing the DIFFSENSE signal with the LVD levels. The DIFFSENSE line being grounded indicates that one or more SE devices are attached on the bus. The AR7519 switches to the termination mode that is appropriate for the bus based on the value of the DIFFSENSE input voltage. For the SE termination, the active terminator will pull RXN to 2.85V and RXP to hard ground. The AR7519 can sink 22 mA per line as required by SCSI specification. The SE resistor will maintain 110 5%. For the LVD termination, the AR7519 integrates two current sources with nine precision resistor strings. This architecture yields a 105 5% differential and 226 10% common mode impedance. A fail-safe bias of 110 mV is sustained when no drivers are connected to the SCSI bus. If the AR7519 detects a HVD SCSI device on the bus, all the signals will be set to a high impedance state. T he wireless communication solution provider

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AR7519

1. 物料型号：AR7519

2. 器件简介： - AR7519是一款多模式SCSI终止器，支持单端（SE）和低压差分（LVD）终止，符合SCSI并行接口（SPI-3）规范，并向后兼容SCSI-1、SCSI-2和SE规范。

3. 引脚分配： - TPWR（27,28）：4.0V至5.75V电源输入引脚，连接到SCSI总线电源线。 - VREF（1）：参考电压引脚，须与4.7pF电容去耦至地。 - HS GND（6,22,14）：散热器地线，应连接到大面积PCB地线以增加散热能力。 - RxP（2,4,7,9,11,18,20,23,25）：终止线，在SE模式下切换到硬地线，在LVD模式下为正线。 - RxN（3,5,8,10,12,19,21,24,26）：终止线，在SE模式下切换到活动线，在LVD模式下为负线。 - ISO（13）：隔离引脚，用于关闭终止器。 - M/S（15）：模式选择引脚，拉高时启用主模式。 - DIFFSENSE（16）：模式感应引脚，用于检测连接到SCSI总线的设备类型。 - DIF_CAP（17）：DIFFSENSE电容器引脚，应连接到0.1uF电容器和20K电阻至SCSI总线DIFFSENSE线。

4. 参数特性： - 支持SCSI-1、SCSI-2、Ultra2、Ultra3/Ultra160标准。 - 具有自动选择单端或低压差分终止的多模式功能。 - 电流限制和热关闭保护。 - 地线驱动器集成用于单端操作。 - SCSI总线热插拔兼容，兼容活动否定驱动器。

5. 功能详解： - AR7519包含所有终止和自动检测SCSI设备所需的功能，无需硬件波动。 - 通过在DIFFSENSE信号上使用电压检测来实现自动选择。 - 在SE终止时，活动终止器将RXN拉至2.85V，RXP硬接地。 - 在LVD终止时，AR7519集成两个电流源和九个精密电阻串，实现105%差分和226%共模阻抗。

6. 应用信息： - 应用于PC服务器和工作站。

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