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SS8218-S4TR 데이터시트(PDF) 8 Page - Silicon Standard Corp. |
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SS8218-S4TR 데이터시트(HTML) 8 Page - Silicon Standard Corp. |
8 / 11 page www.SiliconStandard.com 8 of 11 SS8218 Rev.2.01 6/06/2003 Pin Description (for 28pin SSOP/TSSOP) PIN SYMBOL DESCRIPTION 1 VREF* Reference Voltage. 2.85-volt reference; must be connected to a 4.7µF capacitor. 2-5,7-12, 18-21, 23-26 Rx+, Rx- Signal Termination. (X=1,2,3,…..9) Rx+: Ground line for single-ended or positive line for differential applications for the SCSI bus. Rx-: Signal line/active line for single-ended or negative line in differential applications for the SCSI bus. 6,22 NC/ HS GND No Connect/ HS GND. Should be grounded for heat sinking purpose. 13 DISCNCT Disconnect. When pulled high, the SS8218 isolates its bus pins (Rx+, Rx-) from the SCSI bus. 14 GND Ground. Terminator ground pin. Connected to ground. 15 M/S Master/slave. Used to select which terminator is the controlling device. M/S pin high enables the DIFFSENSE driver. 16 DIFFSENSE Output to drive the SCSI bus DIFFSENS line. 17 DIFFB DIFFB pin should be connected to a 0.1µF capacitor to GND and 20k resistor to SCSI/Bus DIFFSENS line. An input pin to detect the type of device (differential or single-ended) on the SCSI bus. 27,28 TPWR Terminator Power. Connect to the SCSI TERMPWR line and de-couple with a 2.2µF capacitor. *The VREF keeps the level at 2.85 volt, despite the DISCNCT pin is asserted or not; even the termination mode is changed. (36pin SSOP) PIN SYMBOL DESCRIPTION 1 VREF* Reference Voltage. 2.85-volt reference; must be connected to a 4.7µF capacitor. 2,3 NC No Connect. Do not connect these pins. 4-7,11-16, 22-25, 29-32 Rx+ Rx- Signal Termination. (X=1,2,3,…..9) Rx+: Ground line for single-ended or positive line for differential applications for the SCSI bus. Rx-: Signal line/active line for single-ended or negative line in differential applications for the SCSI bus. 8, 9,10,26, 27,28 HS/GND Heat Sink Ground. Connect to large area PC board traces to increase power dissipation capabil- ity. 17 DISCNCT Disconnect. When pulled high, the SS8218 isolates its bus pins (Rx+, Rx-) from the SCSI bus. 18 GND Ground. Terminator ground pin. Connected to ground. 19 M/S Master/slave. Used to select which terminator is the controlling device. M/S pin high enables the DIFFSENSE driver. 20 DIFFSENSE Output to drive the SCSI bus DIFFSENS line. 21 DIFFB DIFFB pin should be connected to a 0.1µF capacitor to GND and 20k resistor to SCSI/Bus DIFFSENS line. An input pin to detect the type of device (differential or single-ended) on the SCSI bus. 33 SE Single ended mode indicator. It is HIGH when terminator is operating in SE mode. 34 LVD Low Voltage Differential mode indicator. It is HIGH when terminator is operating in LVD mode. 35 HVD High Voltage Differential mode indicator. It is HIGH when terminator is operating in HVD mode 36 TPWR Terminator Power. Connect to SCSI bus TERMPWR line and decouple with 2.2µF capacitor. *The VREF keeps the level at 2.85 volt, despite the DISCNCT pin is asserted or not; even the termination mode is changed. |
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