DS21S07A

www.DataSheet4U.com DS21S07A DS21S07A SCSI Terminator FEATURES PIN ASSIGNMENT TERMPWR1 R1 R2 R3 R4 R5 VREF1 GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 PD VREF2 NC R9 R8 R7 R6 TERMPWR2 Fully SCSI compliant with SCSI–1, Fast SCSI and Ultra Backward compatible to the DS2107 and DS2107A Provides active termination for nine signal lines Laser–trimmed 110 2% tolerance ohm termination resistors have Low dropout voltage regulator Power–down from the bus mode isolates termination resistors DS21S07AS 16–PIN SOIC (300 MIL) TERMPWR1 HS–GND R1 R2 R3 R4 R5 HS–GND VREF1 GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 PD VREF2 HS–GND NC R9 R8 R7 R6 HS–GND TERMPWR2 SCSI bus hot plug–compatible Fully supports actively negated SCSI signals Onboard thermal shutdown circuitry 16–pin plastic SOIC (DS21S07AS) and 20–pin plastic TSSOP (Thin Shrink Small Outline Package) (DS21S07AE) DS21S07AE 20–PIN TSSOP (173 MIL) ACTUAL FOOTPRINT SIZE .41” .26” .41” .27” m DS21S07AS DS21S07AE taS hee t4U .co DESCRIPTION Fast SCSI and Ultra SCSI require the use of active terminations at both ends of every cable segment in a SCSI system with single–ended drivers and receivers. The DS21S07A SCSI Terminator, which is fully compliant with these standards, enables the designer to gain the benefits of active termination: greater immunity to voltage drops on the TERMPWR (TERMination PoWeR) line, enhanced high-level noise immunity, intrinsic TERMPWR decoupling, and very low quie...