DS2114 Datasheet, PDF (1/6 Pages) Dallas Semiconductor – SCSI Terminator

DS2114
DS2114
SCSI Terminator
FEATURES
• Fully compliant with SCSI, SCSI–2 and SCSI–3 stan-
dards
• 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)
PIN ASSIGNMENT
TERMPWR1
1
R1
2
16
NC
15
VREF2
R2
3
14
R9
R3
4
13
R8
R4
5
12
R7
R5
6
11
R6
VREF1
7
10
NC
GND
8
9
TERMPWR2
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 de-
signer to gain the benefits of active termination: greater
immunity to voltage drops on the TERMPWR (TER-
Mination PoWeR) line, enhanced high–level noise im-
munity, intrinsic TERMPWR decoupling, and very low
quiescent current consumption. The DS2114 integrates
a regulator and nine precise 110 ohms termination re-
sistors 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.
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