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UCC5680PW28TR Datasheet(PDF) 1 Page - Texas Instruments |
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UCC5680PW28TR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 11 page UCC5680 9LINE LVD ONLY SCSI TERMINATOR WITH INTEGRATED SPI3 DELAYS SLUS313D − MARCH 1999 - REVISED NOVEMBER 2003 1 www.ti.com D LVD-Only Active Termination D 2.7 V to 5.25 V Operation D Differential Failsafe Bias D Built-In SPI-3 Mode Change Filter/Delay D Standards Supported: SPI-2, SPI-3, SPI-4, Ultra2 (Fast 40), Ultra3/Ultra160 (Fast 80) and Ultra320 (Fast 160) description The UCC5680 is an LVD-only Small Computer System Interface (SCSI) terminator that integrates the mode change delay function required by the SPI-3 specification. The device senses what types of SCSI drivers are present on the bus via the voltage on the DIFFSENS SCSI control line. Single-ended (SE) and high-voltage differential (HVD) SCSI drivers (EIA485) are not supported. If the chip detects the presence of an SE or HVD SCSI driver, it disconnects itself by switching all terminating resistors off the bus and enters a high-impedance state. The terminator can also be commanded to disconnect the terminating resistors with the DISCNCT input. Impedance is trimmed for accuracy and maximum effectiveness. Bus lines are biased to a failsafe state to ensure signal integrity. The UCC5680 is offered in both 24-pin and 28-pin TSSOP (PW) packages for a temperature range of 0 °C to 70 °C. functional block diagram UDG−00067 11 12 15 100 ms TO 300 ms DELAY/ FILTER DIFFB 2.15 V 0.6 V DISCNCT 10 µA HIGH−VOLTAGE DIFFERENTIAL LOW−VOLTAGE DIFFERENTIAL SINGLE−ENDED REF 1.3V −15 mA ≤ I SOURCE≤ −5 mA 50 µA ≤ I SINK ≤ 200 µA 4 52 52 3 124 56 mV 56 mV + − − + 25 26 L1 − L1+ L9 − L9+ REF 1.25V 1 REG 28 TRMPWR 14 GND DIFSENS 52 52 124 56 mV 56 mV + − − + 27 SE LVD HVD DISCNCT OPEN DOWN OPEN OPEN MODE ALL SWITCHES ENABLE + + LVD { {28-PIN PACKAGE ONLY Copyright 2000, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. |
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