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PDF ST21S07A Data sheet ( Hoja de datos )
| Número de pieza | ST21S07A | |
| Descripción | SCSI TERMINATOR | |
| Fabricantes | STMicroelectronics | |
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ST21S07A
SCSI TERMINATOR
s FULLY COMPLIANT WITH SCSI, SCSI-2
AND EMERGING SCSI-E STANDARDS
s PROVIDES ACTIVE TERMINATION FOR
NINE SIGNAL LINES
s LOW DROPOUT (0.5V) VREGS:2.85V
s FACTORY TRIMMED TERMINATION 110Ω
(±2%)
s POWER DOWN MODE ISOLATES
TERMINATION RESISTORS FROM THE
BUS
s FULLY SUPPORTS ACTIVELY NEGATED
SCSI SIGNALS
s COMPATIBLE TO THE DS2107, DS2107A
AND DS21S07
s ONBOARD THERMAL SHUTDOWN
CIRCUITRY
s AVAILABLE IN SO-16L AND TSSOP20
s SCSI BUS HOT PLUG-COMPATIBLE
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 a
single-ended drivers and reveivers. The
ST21S07A SCSI terminator, which is fully
SOP
TSSOP
compliant with these standands, enables the
designer to gain the benefits of active termination:
greater immunity to voltages drop on the
TERMPWR (TERMination PoWeR) line,
enhanced high level noise immunity, intrinsic
TERMPWR decouplig, and very low quiescent
current consumption.
The ST21S07A integrates a regulator and nine
precise switched 110Ω termination resistors into a
monolithic IC. The ST21S07A can be electrically
isolatesd from the SCSI bus without physical
removal from the SCSI device.
ORDERING CODES
Type
ST21S07ACW
ST21S07ACWR
S21S07ACTR (*)
(*) Available on request
Temperature Range
0 to 70 °C
0 to 70 °C
0 to 70 °C
Package
SO-16L (Tube)
SO-16L (Tape & Reel)
TSSOP20 (Tape & Reel)
Comments
49parts per tube / 25tube per box
1000 parts per reel
2500 parts per reel
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1 page  
Figure 2 : Typical Scsi Bus Configuraion
ST21S07A
NOTES:
1) C1 = 4.7µF tantalium C2 = 2.2µF tantalium or 4.7mF aluminum
2) If the ST21S07A is to be embedded into a peripheral that will act as a target on a SCSI bus, it is that recommended TERMPWR be derived
from the SCSI cable, not generated locally. In this configuration, if a power failure occurs in the peripheral, it will not affect the bus.
3) A high frequency bypass capacitor (0.1µF recommended) can be added in parallel to C1 for applications using fast rise/fall time drivers.
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ST21S07A.PDF ] | |
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