LX5251CPW中文资料Legacy Power Management数据手册Microchip规格书

描述 Description

Key Features: Compliant with SCSI SPI-2 (Ultra2), SPI-3 (Ultra160), and SPI-4 (Ultra320) Auto-Selectable LVD or Single-Ended Termination Fast Response, No Output Capacitors Required Compatible with Active Negation Drivers 15µA Supply Current in Disconnect Mode Logic Command Disconnects All Termination Lines Diffsense Line Driver Ground Driver Integrated for Single-Ended Operation Current Limit and Thermal Protection Hot-Swap Compatible (Single-Ended) Available in 24-pin TSSOP package Description: The LX5251 is a multimode SCSI terminator that is compatible with the SCSI SPI-2 (Ultra2), SCSI SPI-3 (Ultra3 or Ultra160), and SCSI SPI-4 (Ultra320) specifications developed by the T10 standards committee for low voltage differential (LVD) termination, while providing backwards compatibility to the SCSI, SCSI-2, and SPI single-ended specifications. Multimode compatibility permits the use of legacy devices on the bus without hardware alterations. Automatic mode selection is achieved through voltage detection on the Diffsense line. The LX5251 utilizes an industry standard LVD architecture. The individual high bandwidth drivers maximize channel separation, reduce channel-to-channel noise and cross talk to insure Ultra320 performance. When the LX5251 is enabled, the differential sense (DIFFSENSE) pin supplies a voltage between 1.2V and 1.4V. In application, this pin is tied to the DIFFSENSE input of the corresponding LVD transceivers. This action enables the LVD transceiver function. DIFFSENSE is capable of supplying a maximum of 15mA. Tying the DIFFSENSE pin high places the LX5251 in a HI-Z state indicating the presence of an HVD device. Tying the pin low places the part in a single-ended mode while also signaling the multimode transceiver to operate in a single-ended mode. Recognizing the needs of portable and configurable peripherals, the LX5251 has a TTL compatible sleep/disable mode. During this sleep/disable mode, power dissipation is reduced to a meager 15uA while also placing all outputs in a HI-Z state. Also during sleep/disable mode, the DIFFSENSE function is disabled and is placed in a HI-Z state. The LX5251 also provides a master / slave function. Driving this pin high or floating the pin enables the 1.3V DIFFSENSE reference. Driving the pin low disables the on board DIFFSENSE reference and enables use of an external master reference device.

简介

LX5251CPW属于集成电路（IC）的信号端接器。由制造生产的LX5251CPW信号端接器信号端接器用于向信号路径提供电气端点，以防止信号反射回电路而引起干扰。类型有电缆、DDCA、SCSI、HVD、SE、LVD、串行和 USB，端接数量为 1、2、6、8、9、14、15、18 或 27。