전자부품 데이터시트 검색엔진 |
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SS8219GSTR 데이터시트(PDF) 8 Page - Silicon Standard Corp. |
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SS8219GSTR 데이터시트(HTML) 8 Page - Silicon Standard Corp. |
8 / 10 page www.SiliconStandard.com 8 of 10 12/10/2005 Rev.3.01 SS8219G PIN DESCRIPTION (for 28pin TSSOP) PIN SYMBOL DESCRIPTION 1 VREF Reference Voltage. 2.85-volt reference in SE mode and 1.25V in LVD mode; 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/Heat Sink Ground. Should be grounded for heat sinking purpose 13 DISCNCT Disconnect. When pulled high, the SS8219G 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 An input pin to detect the type of device (differential or single-ended) on the SCSI bus. The DIFFB pin should be connected by a 0.1µF capacitor to GND and by a 20k Ω resistor to the SCSI bus DIFFSENS line. 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 volts, whether the DISCNCT pin is asserted or not; even if the termination mode is changed. PIN DESCRIPTION (for 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 capability. 17 DISCNCT Disconnect. When pulled high, the SS8219G 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 An input pin to detect the type of device (differential or single-ended) on the SCSI bus. The DIFFB pin should be connected by a 0.1µF capacitor to GND and 20k Ω resistor to the SCSI bus DIFFSENS line. 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 volts, whether the DISCNCT pin is asserted or not; even if the termination mode is changed. |
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