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UCC5638FQPTR Datasheet(PDF) 3 Page - Texas Instruments |
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UCC5638FQPTR Datasheet(HTML) 3 Page - Texas Instruments |
3 / 5 page 3 UCC5638 PIN DESCRIPTIONS DIFFB: Diff sense filter pin should be connected at a 0.1 F capacitor. DIFFSENS: The SCSI bus Diff Sense line to detect what types of devices are connected to the SCSI bus. DISCNCT: Disconnect pin shuts down the terminator when it is not at the end of the bus. The disconnect pin low enables the terminator. Note: In Disconnect Mode, the comparitor set powers down for low idle current. LINE n–: Signal line active line for single ended or nega- tive line in differential applications for the SCSI bus. LINE n+: Ground line for single ended or positive line for differential applications for the SCSI bus. REG: Regulator bypass pin, must be connected to a F capacitor. TRMPWR: VIN 2.7V to 5.25V supply, bypass near the terminator with a 4.7 µF capacitor to ground. ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA =TJ = 0°C to 70°C, TRMPWR = 3.3V. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Single Ended Termination Section Impedance Z VL V IL X X = − (. ) 02 , (Note 3) 102.3 110 117.7 Termination Current Signal Level 0.2V, All Lines Low –21 –24 –25.4 mA Signal Level 0.5V –18 –22.4 mA Output Leakage 400 nA Output Capacitance Single Ended Measurement to Ground (Note 1) 3 pF Single Ended GND SE Impedance I= 10mA 20 60 Disconnect and Diff Buffer Input Section DISCNCT Threshold 0.8 2.0 V DISCNCT Input Current 10 30 A Diff Buffer Single Ended to LVD Threshold 0.5 0.7 V Diff Buffer LVD to HPD Threshold 1.9 2.4 V DIFFB Input Current –10 10 A Note 1: Guaranteed by design. Not 100% tested in production. Note 2: Line+ (positive) tied to Line– (negative); [] 12 . – ( max) ( min) V II VCM VCM Note 3: VLX= Output voltage for each terminator minus output pin (L1– through L15–) with each pin unloaded. ILX = Output current for each terminator minus output pin (L1– through L15–) with the minus output pin forced to 0.2V. |
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