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DS2114

Dallas Semiconducotr
Part Number DS2114
Manufacturer Dallas Semiconducotr
Description SCSI Terminator
Published Mar 30, 2005
Detailed Description DS2114 DS2114 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 1...
Datasheet PDF File DS2114 PDF File

DS2114
DS2114

Overview
DS2114 DS2114 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 NC VREF2 R9 R8 R7 R6 NC TERMPWR2 • Fully compliant with SCSI, SCSI–2 and SCSI–3 standards • Provides active termination for nine signal lines • Laser–trimmed 110 ohms termination resistors have 2% tolerance • Low dropout voltage regulator • Fully supports actively negated SCSI signals • Onboard thermal shutdown circuitry • Narrow 16–pin plastic SOIC (DS2114Z) DS2114Z 16–PIN SOIC (150 MIL) DESCRIPTION The SCSI–2 and SCSI–3 standards recommend the use of active terminations at both ends of every cable segment in a SCSI system with single–ended drivers and receivers.
The DS2114 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 quiescent current consumption.
The DS2114 integrates a regulator and nine precise 110 ohms termination resistors into a monolithic IC.
The DS2114 is intended for cable end terminator assemblies and devices where the terminators do not need to be isolated from the SCSI bus.
070198 1/6 DS2114 FUNCTIONAL DESCRIPTION The DS2114 consists of a bandgap reference, buffer amplifier, and nine termination resistors (Figure 1).
The bandgap reference circuit produces a precise 2.
55 volts level which is fed to a buffer amplifier.
The buffer produces a 2.
85 volts level and is capable of sourcing at least 24 mA into each of the termination resistors when the signal line is low (active).
When the driver for a given signal line turns off, the terminator will pull the signal line to 2.
85 volts (quiescent state).
To handle actively negated SCSI signals, the buffer can sink at least 200 mA and Vref will move less than 60 mV.
When all lines settle in the quiescent state, the regulator will consume about ...


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