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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 resi.
SCSI Terminator
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.