SS8218 Datasheet | Silicon Standard

Ultra160 Multi-mode LVD/SE SCSI Terminator Features - Auto-selectable multi-mode Single-Ended General Description The SS8218 Multi-mode LVD/SE SCSI terminator provides a smooth transition to the next generation of the SCSI Parallel Interface (SPI-3). It automatically senses the bus, via DIFFSENS, and switches the termination to either single-ended (SE) or low voltage differential (LVD) SCSI, dependent on which type of devices are connected to the bus. If the SS8218 detects a HVD SCSI device, it switches to a high impedance state. For a 16-bit Wide SCSI bus to be operational, three SS8218 terminators are needed. The Multi-mode terminator contains all functions required to terminate and auto detect and switch modes for SCSI Parallel Interface (SPI) bus architectures. For the SE termination, one regulator and nine precision 110ohm resistors are used. For the LVD termination, the SS8218 integrates 18 regulated supplies with nine precision resistor strings. or LVD Termination - Meets SCSI-1, SCSI-2, SCSI-3 SPI Ultra (Fast-20), Ultra 2(SPI-2 LVD), Ultra160 (SPI-3 LVD) standards. - Supports active negation - 3p F channel capacitance - Thermal protection - Hot-swap patible - 5% tolerance on SE and LVD termination resistance - 28 and 36 pin SSOP package - 28 Pin SSOP: Pin patible with DS2119 - 36 Pin SSOP: Pin patible with DS2118, LX5241 and UCC5630 Applications - Server and workstation - High-end PC - Industrial PC - Disk Array (RAID) - SCSI cable Pin Configuration VREF NC NC R1+ VREF R1+ R1R2+ R2NC/HS GND R3+ R3R4+ R4R5+ 1 2 3 4 5 6 7 8 9 10 11 28 27 26 25 24 23 22 21 20 19 18 17 16 15 TPWR TPWR R9NC/HS R9+ GND R8R8+ NC/HS GND R7R7+ R6R6+ DIFFB DIFFSENSE M/S R1R2+ R2HS/GND HS/GND HS/GND R3+ R3R4+ R4R5+ R5DISCNCT GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 TPWR HVD LVD SE R9R9+ R8R8+ HS/GND HS/GND HS/GND R7R7+ R6R6+ DIFFB DIFFSENSE M/S .. R5- 12 DISCNCT GND 13 14 28Pin...