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LX5112CDP Datasheet(PDF) 4 Page - Microsemi Corporation |
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LX5112CDP Datasheet(HTML) 4 Page - Microsemi Corporation |
4 / 4 page UL TRA 9-C HANNEL SCSI T ERMINA T O R LX5111/5112 PRODUCT DA T ABOOK 1996/1997 Copyright © 1997 Rev. 1.1 12/97 4 P RODUCTION D ATA S HEET UltraMAX BLOCK DIAGRAM FUNCTIONAL DESCRIPTION THERMAL LIMITING CIRCUIT TERM POWER CURRENT BIASING CIRCUIT 1.4V DISCONNECT (5111) DISCONNECT (5112) 24mA CURRENT LIMITING CIRCUIT DATA OUTPUT PIN DB(0) 2.85V 1 OF 9 CHANNELS Cable transmission theory suggests to optimize signal speed and quality, the termination should act both as an ideal voltage reference when the line is released (deasserted) and as an ideal current source when the line is active (asserted). Common active terminators, which consist of Linear Regulators in series with resistors (typically 110 Ω), are a compromise. As the line voltage increases, the amount of current decreases linearly by the equation V = I * R. The LX5111/5112, with their unique new architecture ap- plies the maximum amount of current regardless of line voltage until the termination high threshold (2.85V) is reached. Acting as a near ideal line terminators, the LX5111/5112 closely reproduce the optimum case when the devices are enabled. To enable the device the DISCONNECT pin (DISCONNECT pin for the LX5112) must be pulled logic High (logic Low for the LX5112). During this mode of operation, quiescent current is 6mA and the devices will respond to line demands by delivering 24mA on assertion, and by imposing 2.85V on deassertion. In order to disable the device, the DISCONNECT pin (DISCONNECT pin for the LX5112) must be driven logic Low (logic High for the LX5112). This mode of operation places the devices in a sleep state where a meager 275µA of quiescent current is consumed. Additionally, all outputs are in a Hi-Z (impedance) state. Sleep mode can be used for power conservation or to completely elimi- nate the terminator from the SCSI chain. In the second case, termi- nation node capacitance is impor- tant to consider. The terminators will appear as a parasitic distributed capacitance on the line, which can detract from bus performance. For this reason, the LX5111/5112 have been optimized to have only 3pF of capacitance per output in the sleep state. An additional feature of the LX5111/5112 IC's are their compatibility with active negation drivers. These devices handle up to 60mA of sink current for drivers which exceed the 2.85V output high. UltraMAX is a trademark of Linfinity Microelectronics Inc. Outputs Quiescent Current H L Enabled 6mA L H HI Z 275µA Open Open HI Z 275µA LX5111 LX5112 DISCONNECT DISCONNECT POWER UP / POWER DOWN FUNCTION TABLE PRODUCTION DATA - Information contained in this document is proprietary to Linfinity, and is current as of publication date. This document may not be modified in any way without the express written consent of Linfinity. Product processing does not necessarily include testing of all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time. |
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