DS2117M

DS2117M Ultra3 LVD/SE SCSI Terminator www.dalsemi.com FEATURES Fully compliant with Ultra2, Ultra3, and Ultra 160/m SCSI Provides Multimode Low Voltage Differential/Single-Ended (LVD/SE) www.DataSheet4U.com termination for 9 signal line pairs Auto-selection of LVD or SE termination 5% tolerance on SE and LVD termination resistance Low power down capacitance of 3 pF Onboard thermal shutdown circuitry SCSI bus hot plug compatible Fully supports actively negated SE SCSI signals PIN ASSIGNMENT VREF NC NC R1P R1N R2P R2N HS GND HS GND HS GND R3P R3N R4P R4N R5P R5N ISO 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 R9N R9P R8N R8P HS GND HS GND HS GND R7N R7P R6N R6P DIFF_CAP DIFFSENSE MSTR/SLV DS2117MB 36-Pin SSOP DESCRIPTION The DS2117M Ultra3 LVD/SE SCSI Terminator is both a Low Voltage Differential (LVD) and SingleEnded (SE) terminator. The multimode operation enables the designer to implement LVD in current products while allowing the end-user SE backward compatibility with legacy devices. If the device is connected in an LVD-only bus, the DS2117M will use LVD termination. If any SE devices are connected to the bus, the DS2117M will use SE termination. This is accomplished automatically inside the part by sensing the voltage on the SCSI bus DIFFSENS line. For the LVD termination, the DS2117M integrates two current sources with nine precision resistor strings. For the SE termination, one regulator and ...